http://lod.bco-dmo.org/id/dataset/2592
eng; USA
utf8
dataset
Highest level of data collection, from a common set of sensors or instrumentation, usually within the same research project
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
2010-06-16
ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
ISO 19115-2:2009(E)
Aerosols, short irradiation neutron activation analysis from R/V Thomas G. Thompson cruises in the Arabian Sea in 1995 (U.S. JGOFS Arabian Sea project)
1997-06-30
publication
1997-06-30
revision
BCO-DMO Linked Data URI
1997-06-30
creation
http://lod.bco-dmo.org/id/dataset/2592
Dr Neil Tindale
Texas A&M University
principalInvestigator
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
publisher
Cite this dataset as: Tindale, N. (1997) Aerosols, short irradiation neutron activation analysis from R/V Thomas G. Thompson cruises in the Arabian Sea in 1995 (U.S. JGOFS Arabian Sea project). Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version June 30, 1997 ) Version Date 1997-06-30 [if applicable, indicate subset used]. http://lod.bco-dmo.org/id/dataset/2592 [access date]
Aerosols, short irradiation neutron activation analysis Dataset Description: <pre>
<b>PI:</b> Neil Tindale
<b>of:</b> Texas A&M University
<b>dataset:</b> Aerosols, short irradiation neutron activation analysis
<b>dates:</b> January 08, 1995 to December 25, 1995
<b>location:</b> N: 23.7953 S: 09.9776 W: 57.2609 E: 68.7641
<b>project:</b> Arabian Sea
<b>ship:</b> Thomas Thompson
<a href="http://usjgofs.whoi.edu/PI-NOTES/arabian/Tindale.html"><b>PI Notes and Methodology</b></a>
<a href="http://usjgofs.whoi.edu/PI-NOTES/arabian/DMO-aerosols.html"><b>A note from DMO on supplementary fields</b></a>
</pre>
<br>
HiVol pump sampler methods are described in: N. W. Tindale and P. P. Pease, Aerosols
over the Arabian Sea: Atmospheric transport pathways and concentrations of dust
and sea salt, Deep Sea Research Part II: Topical Studies in OceanographyVolume 46,
Issues 8-9, August 1999, Pages 1577-1595.
( <a
href="http://www.sciencedirect.com/science/article/B6VGC-3Y0RMGY-3/2/e32070ccfcbd49427d79b1b5e77699e6">view article at ScienceDirect</a> ) Methods and Sampling: <pre>
<b>PI:</b> Neil Tindale
<b>of:</b> Texas A&M University
<b>dataset:</b> Aerosols, short irradiation neutron activation analysis
<b>dates:</b> January 08, 1995 to December 25, 1995
<b>location:</b> N: 23.7953 S: 09.9776 W: 57.2609 E: 68.7641
<b>project:</b> Arabian Sea
<b>ship:</b> Thomas Thompson
</pre>
<pre>
<h2>Dr. Neil Tindale, Texas A & M Univ.
JGOFS/Arabian Sea
Aerosols, short and long irradiation neutron activation analysis
</h2>
<b>JGOFS Arabian Sea Aerosol Data</b>
This mineral aerosol concentration data set is from samples collected
during several cruises on the R/V Thomas Thompson during the JGOFS
Arabian Sea field program. The data set includes the sampling period
for each sample; the "Day of Year", yrday, number for the start of the
sampling period for each sample; and the concentration of different
elements for each sample, in micrograms per cubic meter. For the
sampling period, "nd" is used as a filler to indicate "no data" gaps in
the data array. The dust values are estimated using aluminum
concentrations determined by neutron activation analysis. While most
samples cover a multi-day period, we only have data for about 150
days. We didn&#039;t participate in all of the cruises and, on the cruises
where samples were collected, often sampling conditions were less than
ideal (bad weather, ship maneuvering, relative wind from astern etc.).
A few samples that were collected showed obvious contamination from
local sources, presumably from material from the R/V Thompson or from
nearby fishing boats, and these samples were discarded and are not
included in the data set. While the sampling period represents the
period during which sampling occurred, sampling was usually not
continuous. Sampling was frequently stopped, whenever sampling
conditions were no longer suitable. Thus the concentration value at
any particular date represents a time integrated sample which is
usually non-continuous.
Cautionary comments:
1. There may be a problem with the estimate for the mineral "dust"
concentration. Most researchers use the average crustal ratio to estimate
mineral dust concentrations using elemental concentration data (Al, Fe,
etc.). Surface sand and silt samples that were collected in Oman in the
Wahibah Sands region have distinct, non-crustal ratios. If individual
aerosol samples are comprised of material from distinct sources, including
Oman, then it is not unreasonable for their elemental ratios to differ from
the published "average" crustal ratio that is used in most aerosol studies.
2. The amount of Ti in all the aerosol samples was small, despite there
being a reasonable amount of dust material in most samples. The peaks for
Cr and Ti overlap in the neutron activation short irradiation analysis and
if significant quantities of Cr are present, this will interfere with the Ti
analysis. With the exception of one sample, the Ti values are at or below
the detection limit. The sole value above the detection limit was corrected
for the Cr contribution using a correction based on the Cr values from the
long irradiations. The correction changed the Ti value by less than 5%.
The Ti data flagged as being at or below the detection limit was not
corrected for possible Cr interference.
</pre>
<pre><h2>Data management office notes on supplementary fields - aerosols data</h2>
<b>lat, lon</b>
A nominal ship location is given in lat/lon. The location is the noon
position most near the middle of the sampling period, e.g. for a sample
which was pumped intermittently from Jan. 3 - 5, the location is given for
noon, Jan. 4. Intended as an aid to understanding, not a discrete location.
<b>date_begin, date_end</b>
We have included the start and stop day for each sample which we
believe constrains the sample time about as well as is useful for these
data. We also have pump volume and thus a mean concentration of dust
per cubic meter of air for that time frame. The actual number of hours
sampled during a time block (number of days) is complicated to
present. Pumps were turned on and off repetitively depending upon ship
maneuvers and relative wind direction (to prevent ship exhaust
contamination). Also, the total number of hours the pumps were on is a
less useful measure than pump volume, because of the variability in
pump efficiency due to changing barometric pressures. An hours worth of
pumping does not always yield the same volume of air.
</pre>
Funding provided by National Aeronautics & Space Administration (NASA) Award Number: unknown Arabian Sea NASA
completed
Dr Neil Tindale
Texas A&M University
USA
n.tindale@bom.gov.au
pointOfContact
asNeeded
Dataset Version: June 30, 1997
Unknown
cruise
date_begin
date_end
yrday
lat_n
lon_n
vol_pump
Al
Ca
Mg
Mn
Na
Si
Ti
V
dust
Al_err
Al_dl
Ca_err
Ca_dl
Mg_err
Mg_dl
Mn_err
Mn_d
Na_err
Na_dl
Si_err
Si_dl
Ti_err
Ti_dl
V_err
V_dl
dust_err
dust_dl
Pump Air Sampler
theme
None, User defined
cruise id
date begin
date end
year day (Day of Year, or day of year and decimal time)
latitude nominal
No BCO-DMO term
Silicon
velocity north
featureType
BCO-DMO Standard Parameters
Pump Air Sampler
instrument
BCO-DMO Standard Instruments
TT043
TT044
TT045
TT048
TT049
TT050
TT051
TT053
TT054
service
Deployment Activity
U.S. JGOFS Arabian Sea
place
Locations
otherRestrictions
otherRestrictions
Access Constraints: none. Use Constraints: Please follow guidelines at: http://www.bco-dmo.org/terms-use Distribution liability: Under no circumstances shall BCO-DMO be liable for any direct, incidental, special, consequential, indirect, or punitive damages that result from the use of, or the inability to use, the materials in this data submission. If you are dissatisfied with any materials in this data submission your sole and exclusive remedy is to discontinue use.
U.S. Joint Global Ocean Flux Study
http://usjgofs.whoi.edu/
U.S. Joint Global Ocean Flux Study
The United States Joint Global Ocean Flux Study was a national component of international JGOFS and an integral part of global climate change research.
The U.S. launched the Joint Global Ocean Flux Study (JGOFS) in the late 1980s to study the ocean carbon cycle. An ambitious goal was set to understand the controls on the concentrations and fluxes of carbon and associated nutrients in the ocean. A new field of ocean biogeochemistry emerged with an emphasis on quality measurements of carbon system parameters and interdisciplinary field studies of the biological, chemical and physical process which control the ocean carbon cycle. As we studied ocean biogeochemistry, we learned that our simple views of carbon uptake and transport were severely limited, and a new "wave" of ocean science was born. U.S. JGOFS has been supported primarily by the U.S. National Science Foundation in collaboration with the National Oceanic and Atmospheric Administration, the National Aeronautics and Space Administration, the Department of Energy and the Office of Naval Research. U.S. JGOFS, ended in 2005 with the conclusion of the Synthesis and Modeling Project (SMP).
U.S. JGOFS
largerWorkCitation
program
U.S. JGOFS Arabian Sea
http://usjgofs.whoi.edu/research/arabian.html
U.S. JGOFS Arabian Sea
<p>The U.S. Arabian Sea Expedition which began in September 1994 and ended in January 1996, had three major components: a U.S. JGOFS Process Study, supported by the National Science Foundation (NSF); Forced Upper Ocean Dynamics, an Office of Naval Research (ONR) initiative; and shipboard and aircraft measurements supported by the National Aeronautics and Space Administration (NASA). The Expedition consisted of 17 cruises aboard the R/V Thomas Thompson, year-long moored deployments of five instrumented surface buoys and five sediment-trap arrays, aircraft overflights and satellite observations. Of the seventeen ship cruises, six were allocated to repeat process survey cruises, four to SeaSoar mapping cruises, six to mooring and benthic work, and a single calibration cruise which was essentially conducted in transit to the Arabian Sea.</p>
Arabian Sea
largerWorkCitation
project
eng; USA
oceans
U.S. JGOFS Arabian Sea
1997-06-30
Arabian Sea
0
BCO-DMO catalogue of parameters from Aerosols, short irradiation neutron activation analysis from R/V Thomas G. Thompson cruises in the Arabian Sea in 1995 (U.S. JGOFS Arabian Sea project)
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
http://lod.bco-dmo.org/id/dataset-parameter/10371.rdf
Name: cruise
Units: unknown
Description: <p>Arabian Sea, Thomas Thompson cruise identifier</p>
http://lod.bco-dmo.org/id/dataset-parameter/10372.rdf
Name: date_begin
Units: as YYYYMMDD
Description: <p>date sampling pump turned on for a given sample,</p>
http://lod.bco-dmo.org/id/dataset-parameter/10373.rdf
Name: date_end
Units: dimensionless
Description: <p>date sampling pump turned off for a given sample, as YYYYMMDD</p>
http://lod.bco-dmo.org/id/dataset-parameter/10374.rdf
Name: yrday
Units: dimensionless
Description: <p>day of year, 1995</p>
http://lod.bco-dmo.org/id/dataset-parameter/10375.rdf
Name: lat_n
Units: decimal degrees
Description: <p>Nominal latitude (minus indicates South)</p>
http://lod.bco-dmo.org/id/dataset-parameter/10376.rdf
Name: lon_n
Units: decimal degrees
Description: <p>Nominal longitude (minus indicates West)</p>
http://lod.bco-dmo.org/id/dataset-parameter/10377.rdf
Name: vol_pump
Units: cubic meter
Description: <p>volume of air pumped to accumulate sample</p>
http://lod.bco-dmo.org/id/dataset-parameter/10378.rdf
Name: Al
Units: ug/m^3
Description: <p>concentration of Aluminum</p>
http://lod.bco-dmo.org/id/dataset-parameter/10379.rdf
Name: Ca
Units: ug/m^3
Description: <p>concentration of Calcium</p>
http://lod.bco-dmo.org/id/dataset-parameter/10380.rdf
Name: Mg
Units: ug/m^3
Description: <p>concentration of Magnesium</p>
http://lod.bco-dmo.org/id/dataset-parameter/10381.rdf
Name: Mn
Units: ug/m^3
Description: <p>concentration of Manganese</p>
http://lod.bco-dmo.org/id/dataset-parameter/10382.rdf
Name: Na
Units: ug/m^3
Description: <p>concentration of Sodium</p>
http://lod.bco-dmo.org/id/dataset-parameter/10383.rdf
Name: Si
Units: ug/m^3
Description: <p>concentration of Silicon</p>
http://lod.bco-dmo.org/id/dataset-parameter/10384.rdf
Name: Ti
Units: ug/m^3
Description: <p>concentration of Titanium</p>
http://lod.bco-dmo.org/id/dataset-parameter/10385.rdf
Name: V
Units: ug/m^3
Description: <p>concentration of Vanadium</p>
http://lod.bco-dmo.org/id/dataset-parameter/10386.rdf
Name: dust
Units: ug/m^3
Description: <p>total sample mass estimated by assuming the Al content represented 8 percent, based on a crustal average for Al of 8%</p>
http://lod.bco-dmo.org/id/dataset-parameter/14046.rdf
Name: Al_err
Units: ug/m^3
Description: <p>Aluminum combined sampling and analytical error</p>
http://lod.bco-dmo.org/id/dataset-parameter/14047.rdf
Name: Al_dl
Units: unknown
Description: <p>Aluminum detection level:<br />
a '1' indicates that while a peak was detected,<br />
the isotope sample was below the level of detection relative<br />
to background "noise". The element concentration reported<br />
therefore represents the amount of the isotope which would<br />
have had to have been present for it to have been detected.<br />
a '0' indicates no flag - concentration is as measured.</p>
http://lod.bco-dmo.org/id/dataset-parameter/14048.rdf
Name: Ca_err
Units: ug/m^3
Description: <p>Calcium combined sampling and analytical error</p>
http://lod.bco-dmo.org/id/dataset-parameter/14049.rdf
Name: Ca_dl
Units: unknown
Description: <p>Calcium detection level:<br />
a '1' indicates that while a peak was detected,<br />
the isotope sample was below the level of detection relative<br />
to background "noise". The element concentration reported<br />
therefore represents the amount of the isotope which would<br />
have had to have been present for it to have been detected.<br />
a '0' indicates no flag - concentration is as measured.</p>
http://lod.bco-dmo.org/id/dataset-parameter/14050.rdf
Name: Mg_err
Units: ug/m^3
Description: <p>Magnesium combined sampling and analytical error</p>
http://lod.bco-dmo.org/id/dataset-parameter/14051.rdf
Name: Mg_dl
Units: unknown
Description: <p>Magnesium detection level:<br />
a '1' indicates that while a peak was detected,<br />
the isotope sample was below the level of detection relative<br />
to background "noise". The element concentration reported<br />
therefore represents the amount of the isotope which would<br />
have had to have been present for it to have been detected.<br />
a '0' indicates no flag - concentration is as measured.</p>
http://lod.bco-dmo.org/id/dataset-parameter/14052.rdf
Name: Mn_err
Units: ug/m^3
Description: <p>Manganese combined sampling and analytical error</p>
http://lod.bco-dmo.org/id/dataset-parameter/14053.rdf
Name: Mn_d
Units: unknown
Description: <p>Manganese detection level: a '1' indicates that while a peak was detected, the isotope sample was below the level of detection relative to background "noise". The element concentration reported therefore represents the amount of the isotope which would have had to have been present for it to have been detected. a '0' indicates no flag - concentration is as measured.</p>
http://lod.bco-dmo.org/id/dataset-parameter/14054.rdf
Name: Na_err
Units: ug/m^3
Description: <p>Sodium combined sampling and analytical error</p>
http://lod.bco-dmo.org/id/dataset-parameter/14055.rdf
Name: Na_dl
Units: unknown
Description: <p>Sodium detection level:<br />
a '1' indicates that while a peak was detected,<br />
the isotope sample was below the level of detection relative<br />
to background "noise". The element concentration reported<br />
therefore represents the amount of the isotope which would<br />
have had to have been present for it to have been detected.<br />
a '0' indicates no flag - concentration is as measured.</p>
http://lod.bco-dmo.org/id/dataset-parameter/14056.rdf
Name: Si_err
Units: ug/m^3
Description: <p>Silicon combined sampling and analytical error</p>
http://lod.bco-dmo.org/id/dataset-parameter/14057.rdf
Name: Si_dl
Units: unknown
Description: <p>Silicon detection level:<br />
a '1' indicates that while a peak was detected,<br />
the isotope sample was below the level of detection relative<br />
to background "noise". The element concentration reported<br />
therefore represents the amount of the isotope which would<br />
have had to have been present for it to have been detected.<br />
a '0' indicates no flag - concentration is as measured.</p>
http://lod.bco-dmo.org/id/dataset-parameter/14058.rdf
Name: Ti_err
Units: ug/m^3
Description: <p>Titanium combined sampling and analytical error</p>
http://lod.bco-dmo.org/id/dataset-parameter/14059.rdf
Name: Ti_dl
Units: unknown
Description: <p>Titanium detection level:<br />
a '1' indicates that while a peak was detected,<br />
the isotope sample was below the level of detection relative<br />
to background "noise". The element concentration reported<br />
therefore represents the amount of the isotope which would<br />
have had to have been present for it to have been detected.<br />
a '0' indicates no flag - concentration is as measured.</p>
http://lod.bco-dmo.org/id/dataset-parameter/14060.rdf
Name: V_err
Units: ug/m^3
Description: <p>Vanadium combined sampling and analytical error</p>
http://lod.bco-dmo.org/id/dataset-parameter/14061.rdf
Name: V_dl
Units: unknown
Description: <p>Vanadium detection level:<br />
a '1' indicates that while a peak was detected,<br />
the isotope sample was below the level of detection relative<br />
to background "noise". The element concentration reported<br />
therefore represents the amount of the isotope which would<br />
have had to have been present for it to have been detected.<br />
a '0' indicates no flag - concentration is as measured.</p>
http://lod.bco-dmo.org/id/dataset-parameter/14062.rdf
Name: dust_err
Units: ug/m^3
Description: <p>total sample mass combined sampling and analytical error</p>
http://lod.bco-dmo.org/id/dataset-parameter/14063.rdf
Name: dust_dl
Units: unknown
Description: <p>total sample mass detection level:<br />
a '1' indicates that while a peak was detected,<br />
the isotope sample was below the level of detection relative<br />
to background "noise". The element concentration reported<br />
therefore represents the amount of the isotope which would<br />
have had to have been present for it to have been detected.<br />
a '0' indicates no flag - concentration is as measured.</p>
GB/NERC/BODC > British Oceanographic Data Centre, Natural Environment Research Council, United Kingdom
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
11428
https://datadocs.bco-dmo.org/file/oAAmB4RUPYEnkZ/aerosols_short.csv
aerosols_short.csv
Primary data file for dataset ID 2592
download
https://osprey.bco-dmo.org/dataset/2592/data/download
download
onLine
dataset
<pre>
<b>PI:</b> Neil Tindale
<b>of:</b> Texas A&M University
<b>dataset:</b> Aerosols, short irradiation neutron activation analysis
<b>dates:</b> January 08, 1995 to December 25, 1995
<b>location:</b> N: 23.7953 S: 09.9776 W: 57.2609 E: 68.7641
<b>project:</b> Arabian Sea
<b>ship:</b> Thomas Thompson
</pre>
<pre>
<h2>Dr. Neil Tindale, Texas A & M Univ.
JGOFS/Arabian Sea
Aerosols, short and long irradiation neutron activation analysis
</h2>
<b>JGOFS Arabian Sea Aerosol Data</b>
This mineral aerosol concentration data set is from samples collected
during several cruises on the R/V Thomas Thompson during the JGOFS
Arabian Sea field program. The data set includes the sampling period
for each sample; the "Day of Year", yrday, number for the start of the
sampling period for each sample; and the concentration of different
elements for each sample, in micrograms per cubic meter. For the
sampling period, "nd" is used as a filler to indicate "no data" gaps in
the data array. The dust values are estimated using aluminum
concentrations determined by neutron activation analysis. While most
samples cover a multi-day period, we only have data for about 150
days. We didn&#039;t participate in all of the cruises and, on the cruises
where samples were collected, often sampling conditions were less than
ideal (bad weather, ship maneuvering, relative wind from astern etc.).
A few samples that were collected showed obvious contamination from
local sources, presumably from material from the R/V Thompson or from
nearby fishing boats, and these samples were discarded and are not
included in the data set. While the sampling period represents the
period during which sampling occurred, sampling was usually not
continuous. Sampling was frequently stopped, whenever sampling
conditions were no longer suitable. Thus the concentration value at
any particular date represents a time integrated sample which is
usually non-continuous.
Cautionary comments:
1. There may be a problem with the estimate for the mineral "dust"
concentration. Most researchers use the average crustal ratio to estimate
mineral dust concentrations using elemental concentration data (Al, Fe,
etc.). Surface sand and silt samples that were collected in Oman in the
Wahibah Sands region have distinct, non-crustal ratios. If individual
aerosol samples are comprised of material from distinct sources, including
Oman, then it is not unreasonable for their elemental ratios to differ from
the published "average" crustal ratio that is used in most aerosol studies.
2. The amount of Ti in all the aerosol samples was small, despite there
being a reasonable amount of dust material in most samples. The peaks for
Cr and Ti overlap in the neutron activation short irradiation analysis and
if significant quantities of Cr are present, this will interfere with the Ti
analysis. With the exception of one sample, the Ti values are at or below
the detection limit. The sole value above the detection limit was corrected
for the Cr contribution using a correction based on the Cr values from the
long irradiations. The correction changed the Ti value by less than 5%.
The Ti data flagged as being at or below the detection limit was not
corrected for possible Cr interference.
</pre>
<pre><h2>Data management office notes on supplementary fields - aerosols data</h2>
<b>lat, lon</b>
A nominal ship location is given in lat/lon. The location is the noon
position most near the middle of the sampling period, e.g. for a sample
which was pumped intermittently from Jan. 3 - 5, the location is given for
noon, Jan. 4. Intended as an aid to understanding, not a discrete location.
<b>date_begin, date_end</b>
We have included the start and stop day for each sample which we
believe constrains the sample time about as well as is useful for these
data. We also have pump volume and thus a mean concentration of dust
per cubic meter of air for that time frame. The actual number of hours
sampled during a time block (number of days) is complicated to
present. Pumps were turned on and off repetitively depending upon ship
maneuvers and relative wind direction (to prevent ship exhaust
contamination). Also, the total number of hours the pumps were on is a
less useful measure than pump volume, because of the variability in
pump efficiency due to changing barometric pressures. An hours worth of
pumping does not always yield the same volume of air.
</pre>
from Cruise: TT043 <pre>
<b>PI:</b> Neil Tindale
<b>of:</b> Texas A&M University
<b>dataset:</b> Aerosols, short irradiation neutron activation analysis
<b>dates:</b> January 08, 1995 to December 25, 1995
<b>location:</b> N: 23.7953 S: 09.9776 W: 57.2609 E: 68.7641
<b>project:</b> Arabian Sea
<b>ship:</b> Thomas Thompson
</pre>
<pre>
<h2>Dr. Neil Tindale, Texas A & M Univ.
JGOFS/Arabian Sea
Aerosols, short and long irradiation neutron activation analysis
</h2>
<b>JGOFS Arabian Sea Aerosol Data</b>
This mineral aerosol concentration data set is from samples collected
during several cruises on the R/V Thomas Thompson during the JGOFS
Arabian Sea field program. The data set includes the sampling period
for each sample; the "Day of Year", yrday, number for the start of the
sampling period for each sample; and the concentration of different
elements for each sample, in micrograms per cubic meter. For the
sampling period, "nd" is used as a filler to indicate "no data" gaps in
the data array. The dust values are estimated using aluminum
concentrations determined by neutron activation analysis. While most
samples cover a multi-day period, we only have data for about 150
days. We didn't participate in all of the cruises and, on the cruises
where samples were collected, often sampling conditions were less than
ideal (bad weather, ship maneuvering, relative wind from astern etc.).
A few samples that were collected showed obvious contamination from
local sources, presumably from material from the R/V Thompson or from
nearby fishing boats, and these samples were discarded and are not
included in the data set. While the sampling period represents the
period during which sampling occurred, sampling was usually not
continuous. Sampling was frequently stopped, whenever sampling
conditions were no longer suitable. Thus the concentration value at
any particular date represents a time integrated sample which is
usually non-continuous.
Cautionary comments:
1. There may be a problem with the estimate for the mineral "dust"
concentration. Most researchers use the average crustal ratio to estimate
mineral dust concentrations using elemental concentration data (Al, Fe,
etc.). Surface sand and silt samples that were collected in Oman in the
Wahibah Sands region have distinct, non-crustal ratios. If individual
aerosol samples are comprised of material from distinct sources, including
Oman, then it is not unreasonable for their elemental ratios to differ from
the published "average" crustal ratio that is used in most aerosol studies.
2. The amount of Ti in all the aerosol samples was small, despite there
being a reasonable amount of dust material in most samples. The peaks for
Cr and Ti overlap in the neutron activation short irradiation analysis and
if significant quantities of Cr are present, this will interfere with the Ti
analysis. With the exception of one sample, the Ti values are at or below
the detection limit. The sole value above the detection limit was corrected
for the Cr contribution using a correction based on the Cr values from the
long irradiations. The correction changed the Ti value by less than 5%.
The Ti data flagged as being at or below the detection limit was not
corrected for possible Cr interference.
</pre>
<pre><h2>Data management office notes on supplementary fields - aerosols data</h2>
<b>lat, lon</b>
A nominal ship location is given in lat/lon. The location is the noon
position most near the middle of the sampling period, e.g. for a sample
which was pumped intermittently from Jan. 3 - 5, the location is given for
noon, Jan. 4. Intended as an aid to understanding, not a discrete location.
<b>date_begin, date_end</b>
We have included the start and stop day for each sample which we
believe constrains the sample time about as well as is useful for these
data. We also have pump volume and thus a mean concentration of dust
per cubic meter of air for that time frame. The actual number of hours
sampled during a time block (number of days) is complicated to
present. Pumps were turned on and off repetitively depending upon ship
maneuvers and relative wind direction (to prevent ship exhaust
contamination). Also, the total number of hours the pumps were on is a
less useful measure than pump volume, because of the variability in
pump efficiency due to changing barometric pressures. An hours worth of
pumping does not always yield the same volume of air.
</pre>
from Cruise: TT044 <pre>
<b>PI:</b> Neil Tindale
<b>of:</b> Texas A&M University
<b>dataset:</b> Aerosols, short irradiation neutron activation analysis
<b>dates:</b> January 08, 1995 to December 25, 1995
<b>location:</b> N: 23.7953 S: 09.9776 W: 57.2609 E: 68.7641
<b>project:</b> Arabian Sea
<b>ship:</b> Thomas Thompson
</pre>
<pre>
<h2>Dr. Neil Tindale, Texas A & M Univ.
JGOFS/Arabian Sea
Aerosols, short and long irradiation neutron activation analysis
</h2>
<b>JGOFS Arabian Sea Aerosol Data</b>
This mineral aerosol concentration data set is from samples collected
during several cruises on the R/V Thomas Thompson during the JGOFS
Arabian Sea field program. The data set includes the sampling period
for each sample; the "Day of Year", yrday, number for the start of the
sampling period for each sample; and the concentration of different
elements for each sample, in micrograms per cubic meter. For the
sampling period, "nd" is used as a filler to indicate "no data" gaps in
the data array. The dust values are estimated using aluminum
concentrations determined by neutron activation analysis. While most
samples cover a multi-day period, we only have data for about 150
days. We didn't participate in all of the cruises and, on the cruises
where samples were collected, often sampling conditions were less than
ideal (bad weather, ship maneuvering, relative wind from astern etc.).
A few samples that were collected showed obvious contamination from
local sources, presumably from material from the R/V Thompson or from
nearby fishing boats, and these samples were discarded and are not
included in the data set. While the sampling period represents the
period during which sampling occurred, sampling was usually not
continuous. Sampling was frequently stopped, whenever sampling
conditions were no longer suitable. Thus the concentration value at
any particular date represents a time integrated sample which is
usually non-continuous.
Cautionary comments:
1. There may be a problem with the estimate for the mineral "dust"
concentration. Most researchers use the average crustal ratio to estimate
mineral dust concentrations using elemental concentration data (Al, Fe,
etc.). Surface sand and silt samples that were collected in Oman in the
Wahibah Sands region have distinct, non-crustal ratios. If individual
aerosol samples are comprised of material from distinct sources, including
Oman, then it is not unreasonable for their elemental ratios to differ from
the published "average" crustal ratio that is used in most aerosol studies.
2. The amount of Ti in all the aerosol samples was small, despite there
being a reasonable amount of dust material in most samples. The peaks for
Cr and Ti overlap in the neutron activation short irradiation analysis and
if significant quantities of Cr are present, this will interfere with the Ti
analysis. With the exception of one sample, the Ti values are at or below
the detection limit. The sole value above the detection limit was corrected
for the Cr contribution using a correction based on the Cr values from the
long irradiations. The correction changed the Ti value by less than 5%.
The Ti data flagged as being at or below the detection limit was not
corrected for possible Cr interference.
</pre>
<pre><h2>Data management office notes on supplementary fields - aerosols data</h2>
<b>lat, lon</b>
A nominal ship location is given in lat/lon. The location is the noon
position most near the middle of the sampling period, e.g. for a sample
which was pumped intermittently from Jan. 3 - 5, the location is given for
noon, Jan. 4. Intended as an aid to understanding, not a discrete location.
<b>date_begin, date_end</b>
We have included the start and stop day for each sample which we
believe constrains the sample time about as well as is useful for these
data. We also have pump volume and thus a mean concentration of dust
per cubic meter of air for that time frame. The actual number of hours
sampled during a time block (number of days) is complicated to
present. Pumps were turned on and off repetitively depending upon ship
maneuvers and relative wind direction (to prevent ship exhaust
contamination). Also, the total number of hours the pumps were on is a
less useful measure than pump volume, because of the variability in
pump efficiency due to changing barometric pressures. An hours worth of
pumping does not always yield the same volume of air.
</pre>
from Cruise: TT045 <pre>
<b>PI:</b> Neil Tindale
<b>of:</b> Texas A&M University
<b>dataset:</b> Aerosols, short irradiation neutron activation analysis
<b>dates:</b> January 08, 1995 to December 25, 1995
<b>location:</b> N: 23.7953 S: 09.9776 W: 57.2609 E: 68.7641
<b>project:</b> Arabian Sea
<b>ship:</b> Thomas Thompson
</pre>
<pre>
<h2>Dr. Neil Tindale, Texas A & M Univ.
JGOFS/Arabian Sea
Aerosols, short and long irradiation neutron activation analysis
</h2>
<b>JGOFS Arabian Sea Aerosol Data</b>
This mineral aerosol concentration data set is from samples collected
during several cruises on the R/V Thomas Thompson during the JGOFS
Arabian Sea field program. The data set includes the sampling period
for each sample; the "Day of Year", yrday, number for the start of the
sampling period for each sample; and the concentration of different
elements for each sample, in micrograms per cubic meter. For the
sampling period, "nd" is used as a filler to indicate "no data" gaps in
the data array. The dust values are estimated using aluminum
concentrations determined by neutron activation analysis. While most
samples cover a multi-day period, we only have data for about 150
days. We didn't participate in all of the cruises and, on the cruises
where samples were collected, often sampling conditions were less than
ideal (bad weather, ship maneuvering, relative wind from astern etc.).
A few samples that were collected showed obvious contamination from
local sources, presumably from material from the R/V Thompson or from
nearby fishing boats, and these samples were discarded and are not
included in the data set. While the sampling period represents the
period during which sampling occurred, sampling was usually not
continuous. Sampling was frequently stopped, whenever sampling
conditions were no longer suitable. Thus the concentration value at
any particular date represents a time integrated sample which is
usually non-continuous.
Cautionary comments:
1. There may be a problem with the estimate for the mineral "dust"
concentration. Most researchers use the average crustal ratio to estimate
mineral dust concentrations using elemental concentration data (Al, Fe,
etc.). Surface sand and silt samples that were collected in Oman in the
Wahibah Sands region have distinct, non-crustal ratios. If individual
aerosol samples are comprised of material from distinct sources, including
Oman, then it is not unreasonable for their elemental ratios to differ from
the published "average" crustal ratio that is used in most aerosol studies.
2. The amount of Ti in all the aerosol samples was small, despite there
being a reasonable amount of dust material in most samples. The peaks for
Cr and Ti overlap in the neutron activation short irradiation analysis and
if significant quantities of Cr are present, this will interfere with the Ti
analysis. With the exception of one sample, the Ti values are at or below
the detection limit. The sole value above the detection limit was corrected
for the Cr contribution using a correction based on the Cr values from the
long irradiations. The correction changed the Ti value by less than 5%.
The Ti data flagged as being at or below the detection limit was not
corrected for possible Cr interference.
</pre>
<pre><h2>Data management office notes on supplementary fields - aerosols data</h2>
<b>lat, lon</b>
A nominal ship location is given in lat/lon. The location is the noon
position most near the middle of the sampling period, e.g. for a sample
which was pumped intermittently from Jan. 3 - 5, the location is given for
noon, Jan. 4. Intended as an aid to understanding, not a discrete location.
<b>date_begin, date_end</b>
We have included the start and stop day for each sample which we
believe constrains the sample time about as well as is useful for these
data. We also have pump volume and thus a mean concentration of dust
per cubic meter of air for that time frame. The actual number of hours
sampled during a time block (number of days) is complicated to
present. Pumps were turned on and off repetitively depending upon ship
maneuvers and relative wind direction (to prevent ship exhaust
contamination). Also, the total number of hours the pumps were on is a
less useful measure than pump volume, because of the variability in
pump efficiency due to changing barometric pressures. An hours worth of
pumping does not always yield the same volume of air.
</pre>
from Cruise: TT048 <pre>
<b>PI:</b> Neil Tindale
<b>of:</b> Texas A&M University
<b>dataset:</b> Aerosols, short irradiation neutron activation analysis
<b>dates:</b> January 08, 1995 to December 25, 1995
<b>location:</b> N: 23.7953 S: 09.9776 W: 57.2609 E: 68.7641
<b>project:</b> Arabian Sea
<b>ship:</b> Thomas Thompson
</pre>
<pre>
<h2>Dr. Neil Tindale, Texas A & M Univ.
JGOFS/Arabian Sea
Aerosols, short and long irradiation neutron activation analysis
</h2>
<b>JGOFS Arabian Sea Aerosol Data</b>
This mineral aerosol concentration data set is from samples collected
during several cruises on the R/V Thomas Thompson during the JGOFS
Arabian Sea field program. The data set includes the sampling period
for each sample; the "Day of Year", yrday, number for the start of the
sampling period for each sample; and the concentration of different
elements for each sample, in micrograms per cubic meter. For the
sampling period, "nd" is used as a filler to indicate "no data" gaps in
the data array. The dust values are estimated using aluminum
concentrations determined by neutron activation analysis. While most
samples cover a multi-day period, we only have data for about 150
days. We didn't participate in all of the cruises and, on the cruises
where samples were collected, often sampling conditions were less than
ideal (bad weather, ship maneuvering, relative wind from astern etc.).
A few samples that were collected showed obvious contamination from
local sources, presumably from material from the R/V Thompson or from
nearby fishing boats, and these samples were discarded and are not
included in the data set. While the sampling period represents the
period during which sampling occurred, sampling was usually not
continuous. Sampling was frequently stopped, whenever sampling
conditions were no longer suitable. Thus the concentration value at
any particular date represents a time integrated sample which is
usually non-continuous.
Cautionary comments:
1. There may be a problem with the estimate for the mineral "dust"
concentration. Most researchers use the average crustal ratio to estimate
mineral dust concentrations using elemental concentration data (Al, Fe,
etc.). Surface sand and silt samples that were collected in Oman in the
Wahibah Sands region have distinct, non-crustal ratios. If individual
aerosol samples are comprised of material from distinct sources, including
Oman, then it is not unreasonable for their elemental ratios to differ from
the published "average" crustal ratio that is used in most aerosol studies.
2. The amount of Ti in all the aerosol samples was small, despite there
being a reasonable amount of dust material in most samples. The peaks for
Cr and Ti overlap in the neutron activation short irradiation analysis and
if significant quantities of Cr are present, this will interfere with the Ti
analysis. With the exception of one sample, the Ti values are at or below
the detection limit. The sole value above the detection limit was corrected
for the Cr contribution using a correction based on the Cr values from the
long irradiations. The correction changed the Ti value by less than 5%.
The Ti data flagged as being at or below the detection limit was not
corrected for possible Cr interference.
</pre>
<pre><h2>Data management office notes on supplementary fields - aerosols data</h2>
<b>lat, lon</b>
A nominal ship location is given in lat/lon. The location is the noon
position most near the middle of the sampling period, e.g. for a sample
which was pumped intermittently from Jan. 3 - 5, the location is given for
noon, Jan. 4. Intended as an aid to understanding, not a discrete location.
<b>date_begin, date_end</b>
We have included the start and stop day for each sample which we
believe constrains the sample time about as well as is useful for these
data. We also have pump volume and thus a mean concentration of dust
per cubic meter of air for that time frame. The actual number of hours
sampled during a time block (number of days) is complicated to
present. Pumps were turned on and off repetitively depending upon ship
maneuvers and relative wind direction (to prevent ship exhaust
contamination). Also, the total number of hours the pumps were on is a
less useful measure than pump volume, because of the variability in
pump efficiency due to changing barometric pressures. An hours worth of
pumping does not always yield the same volume of air.
</pre>
from Cruise: TT049 <pre>
<b>PI:</b> Neil Tindale
<b>of:</b> Texas A&M University
<b>dataset:</b> Aerosols, short irradiation neutron activation analysis
<b>dates:</b> January 08, 1995 to December 25, 1995
<b>location:</b> N: 23.7953 S: 09.9776 W: 57.2609 E: 68.7641
<b>project:</b> Arabian Sea
<b>ship:</b> Thomas Thompson
</pre>
<pre>
<h2>Dr. Neil Tindale, Texas A & M Univ.
JGOFS/Arabian Sea
Aerosols, short and long irradiation neutron activation analysis
</h2>
<b>JGOFS Arabian Sea Aerosol Data</b>
This mineral aerosol concentration data set is from samples collected
during several cruises on the R/V Thomas Thompson during the JGOFS
Arabian Sea field program. The data set includes the sampling period
for each sample; the "Day of Year", yrday, number for the start of the
sampling period for each sample; and the concentration of different
elements for each sample, in micrograms per cubic meter. For the
sampling period, "nd" is used as a filler to indicate "no data" gaps in
the data array. The dust values are estimated using aluminum
concentrations determined by neutron activation analysis. While most
samples cover a multi-day period, we only have data for about 150
days. We didn't participate in all of the cruises and, on the cruises
where samples were collected, often sampling conditions were less than
ideal (bad weather, ship maneuvering, relative wind from astern etc.).
A few samples that were collected showed obvious contamination from
local sources, presumably from material from the R/V Thompson or from
nearby fishing boats, and these samples were discarded and are not
included in the data set. While the sampling period represents the
period during which sampling occurred, sampling was usually not
continuous. Sampling was frequently stopped, whenever sampling
conditions were no longer suitable. Thus the concentration value at
any particular date represents a time integrated sample which is
usually non-continuous.
Cautionary comments:
1. There may be a problem with the estimate for the mineral "dust"
concentration. Most researchers use the average crustal ratio to estimate
mineral dust concentrations using elemental concentration data (Al, Fe,
etc.). Surface sand and silt samples that were collected in Oman in the
Wahibah Sands region have distinct, non-crustal ratios. If individual
aerosol samples are comprised of material from distinct sources, including
Oman, then it is not unreasonable for their elemental ratios to differ from
the published "average" crustal ratio that is used in most aerosol studies.
2. The amount of Ti in all the aerosol samples was small, despite there
being a reasonable amount of dust material in most samples. The peaks for
Cr and Ti overlap in the neutron activation short irradiation analysis and
if significant quantities of Cr are present, this will interfere with the Ti
analysis. With the exception of one sample, the Ti values are at or below
the detection limit. The sole value above the detection limit was corrected
for the Cr contribution using a correction based on the Cr values from the
long irradiations. The correction changed the Ti value by less than 5%.
The Ti data flagged as being at or below the detection limit was not
corrected for possible Cr interference.
</pre>
<pre><h2>Data management office notes on supplementary fields - aerosols data</h2>
<b>lat, lon</b>
A nominal ship location is given in lat/lon. The location is the noon
position most near the middle of the sampling period, e.g. for a sample
which was pumped intermittently from Jan. 3 - 5, the location is given for
noon, Jan. 4. Intended as an aid to understanding, not a discrete location.
<b>date_begin, date_end</b>
We have included the start and stop day for each sample which we
believe constrains the sample time about as well as is useful for these
data. We also have pump volume and thus a mean concentration of dust
per cubic meter of air for that time frame. The actual number of hours
sampled during a time block (number of days) is complicated to
present. Pumps were turned on and off repetitively depending upon ship
maneuvers and relative wind direction (to prevent ship exhaust
contamination). Also, the total number of hours the pumps were on is a
less useful measure than pump volume, because of the variability in
pump efficiency due to changing barometric pressures. An hours worth of
pumping does not always yield the same volume of air.
</pre>
from Cruise: TT050 <pre>
<b>PI:</b> Neil Tindale
<b>of:</b> Texas A&M University
<b>dataset:</b> Aerosols, short irradiation neutron activation analysis
<b>dates:</b> January 08, 1995 to December 25, 1995
<b>location:</b> N: 23.7953 S: 09.9776 W: 57.2609 E: 68.7641
<b>project:</b> Arabian Sea
<b>ship:</b> Thomas Thompson
</pre>
<pre>
<h2>Dr. Neil Tindale, Texas A & M Univ.
JGOFS/Arabian Sea
Aerosols, short and long irradiation neutron activation analysis
</h2>
<b>JGOFS Arabian Sea Aerosol Data</b>
This mineral aerosol concentration data set is from samples collected
during several cruises on the R/V Thomas Thompson during the JGOFS
Arabian Sea field program. The data set includes the sampling period
for each sample; the "Day of Year", yrday, number for the start of the
sampling period for each sample; and the concentration of different
elements for each sample, in micrograms per cubic meter. For the
sampling period, "nd" is used as a filler to indicate "no data" gaps in
the data array. The dust values are estimated using aluminum
concentrations determined by neutron activation analysis. While most
samples cover a multi-day period, we only have data for about 150
days. We didn't participate in all of the cruises and, on the cruises
where samples were collected, often sampling conditions were less than
ideal (bad weather, ship maneuvering, relative wind from astern etc.).
A few samples that were collected showed obvious contamination from
local sources, presumably from material from the R/V Thompson or from
nearby fishing boats, and these samples were discarded and are not
included in the data set. While the sampling period represents the
period during which sampling occurred, sampling was usually not
continuous. Sampling was frequently stopped, whenever sampling
conditions were no longer suitable. Thus the concentration value at
any particular date represents a time integrated sample which is
usually non-continuous.
Cautionary comments:
1. There may be a problem with the estimate for the mineral "dust"
concentration. Most researchers use the average crustal ratio to estimate
mineral dust concentrations using elemental concentration data (Al, Fe,
etc.). Surface sand and silt samples that were collected in Oman in the
Wahibah Sands region have distinct, non-crustal ratios. If individual
aerosol samples are comprised of material from distinct sources, including
Oman, then it is not unreasonable for their elemental ratios to differ from
the published "average" crustal ratio that is used in most aerosol studies.
2. The amount of Ti in all the aerosol samples was small, despite there
being a reasonable amount of dust material in most samples. The peaks for
Cr and Ti overlap in the neutron activation short irradiation analysis and
if significant quantities of Cr are present, this will interfere with the Ti
analysis. With the exception of one sample, the Ti values are at or below
the detection limit. The sole value above the detection limit was corrected
for the Cr contribution using a correction based on the Cr values from the
long irradiations. The correction changed the Ti value by less than 5%.
The Ti data flagged as being at or below the detection limit was not
corrected for possible Cr interference.
</pre>
<pre><h2>Data management office notes on supplementary fields - aerosols data</h2>
<b>lat, lon</b>
A nominal ship location is given in lat/lon. The location is the noon
position most near the middle of the sampling period, e.g. for a sample
which was pumped intermittently from Jan. 3 - 5, the location is given for
noon, Jan. 4. Intended as an aid to understanding, not a discrete location.
<b>date_begin, date_end</b>
We have included the start and stop day for each sample which we
believe constrains the sample time about as well as is useful for these
data. We also have pump volume and thus a mean concentration of dust
per cubic meter of air for that time frame. The actual number of hours
sampled during a time block (number of days) is complicated to
present. Pumps were turned on and off repetitively depending upon ship
maneuvers and relative wind direction (to prevent ship exhaust
contamination). Also, the total number of hours the pumps were on is a
less useful measure than pump volume, because of the variability in
pump efficiency due to changing barometric pressures. An hours worth of
pumping does not always yield the same volume of air.
</pre>
from Cruise: TT051 <pre>
<b>PI:</b> Neil Tindale
<b>of:</b> Texas A&M University
<b>dataset:</b> Aerosols, short irradiation neutron activation analysis
<b>dates:</b> January 08, 1995 to December 25, 1995
<b>location:</b> N: 23.7953 S: 09.9776 W: 57.2609 E: 68.7641
<b>project:</b> Arabian Sea
<b>ship:</b> Thomas Thompson
</pre>
<pre>
<h2>Dr. Neil Tindale, Texas A & M Univ.
JGOFS/Arabian Sea
Aerosols, short and long irradiation neutron activation analysis
</h2>
<b>JGOFS Arabian Sea Aerosol Data</b>
This mineral aerosol concentration data set is from samples collected
during several cruises on the R/V Thomas Thompson during the JGOFS
Arabian Sea field program. The data set includes the sampling period
for each sample; the "Day of Year", yrday, number for the start of the
sampling period for each sample; and the concentration of different
elements for each sample, in micrograms per cubic meter. For the
sampling period, "nd" is used as a filler to indicate "no data" gaps in
the data array. The dust values are estimated using aluminum
concentrations determined by neutron activation analysis. While most
samples cover a multi-day period, we only have data for about 150
days. We didn't participate in all of the cruises and, on the cruises
where samples were collected, often sampling conditions were less than
ideal (bad weather, ship maneuvering, relative wind from astern etc.).
A few samples that were collected showed obvious contamination from
local sources, presumably from material from the R/V Thompson or from
nearby fishing boats, and these samples were discarded and are not
included in the data set. While the sampling period represents the
period during which sampling occurred, sampling was usually not
continuous. Sampling was frequently stopped, whenever sampling
conditions were no longer suitable. Thus the concentration value at
any particular date represents a time integrated sample which is
usually non-continuous.
Cautionary comments:
1. There may be a problem with the estimate for the mineral "dust"
concentration. Most researchers use the average crustal ratio to estimate
mineral dust concentrations using elemental concentration data (Al, Fe,
etc.). Surface sand and silt samples that were collected in Oman in the
Wahibah Sands region have distinct, non-crustal ratios. If individual
aerosol samples are comprised of material from distinct sources, including
Oman, then it is not unreasonable for their elemental ratios to differ from
the published "average" crustal ratio that is used in most aerosol studies.
2. The amount of Ti in all the aerosol samples was small, despite there
being a reasonable amount of dust material in most samples. The peaks for
Cr and Ti overlap in the neutron activation short irradiation analysis and
if significant quantities of Cr are present, this will interfere with the Ti
analysis. With the exception of one sample, the Ti values are at or below
the detection limit. The sole value above the detection limit was corrected
for the Cr contribution using a correction based on the Cr values from the
long irradiations. The correction changed the Ti value by less than 5%.
The Ti data flagged as being at or below the detection limit was not
corrected for possible Cr interference.
</pre>
<pre><h2>Data management office notes on supplementary fields - aerosols data</h2>
<b>lat, lon</b>
A nominal ship location is given in lat/lon. The location is the noon
position most near the middle of the sampling period, e.g. for a sample
which was pumped intermittently from Jan. 3 - 5, the location is given for
noon, Jan. 4. Intended as an aid to understanding, not a discrete location.
<b>date_begin, date_end</b>
We have included the start and stop day for each sample which we
believe constrains the sample time about as well as is useful for these
data. We also have pump volume and thus a mean concentration of dust
per cubic meter of air for that time frame. The actual number of hours
sampled during a time block (number of days) is complicated to
present. Pumps were turned on and off repetitively depending upon ship
maneuvers and relative wind direction (to prevent ship exhaust
contamination). Also, the total number of hours the pumps were on is a
less useful measure than pump volume, because of the variability in
pump efficiency due to changing barometric pressures. An hours worth of
pumping does not always yield the same volume of air.
</pre>
from Cruise: TT053 <pre>
<b>PI:</b> Neil Tindale
<b>of:</b> Texas A&M University
<b>dataset:</b> Aerosols, short irradiation neutron activation analysis
<b>dates:</b> January 08, 1995 to December 25, 1995
<b>location:</b> N: 23.7953 S: 09.9776 W: 57.2609 E: 68.7641
<b>project:</b> Arabian Sea
<b>ship:</b> Thomas Thompson
</pre>
<pre>
<h2>Dr. Neil Tindale, Texas A & M Univ.
JGOFS/Arabian Sea
Aerosols, short and long irradiation neutron activation analysis
</h2>
<b>JGOFS Arabian Sea Aerosol Data</b>
This mineral aerosol concentration data set is from samples collected
during several cruises on the R/V Thomas Thompson during the JGOFS
Arabian Sea field program. The data set includes the sampling period
for each sample; the "Day of Year", yrday, number for the start of the
sampling period for each sample; and the concentration of different
elements for each sample, in micrograms per cubic meter. For the
sampling period, "nd" is used as a filler to indicate "no data" gaps in
the data array. The dust values are estimated using aluminum
concentrations determined by neutron activation analysis. While most
samples cover a multi-day period, we only have data for about 150
days. We didn't participate in all of the cruises and, on the cruises
where samples were collected, often sampling conditions were less than
ideal (bad weather, ship maneuvering, relative wind from astern etc.).
A few samples that were collected showed obvious contamination from
local sources, presumably from material from the R/V Thompson or from
nearby fishing boats, and these samples were discarded and are not
included in the data set. While the sampling period represents the
period during which sampling occurred, sampling was usually not
continuous. Sampling was frequently stopped, whenever sampling
conditions were no longer suitable. Thus the concentration value at
any particular date represents a time integrated sample which is
usually non-continuous.
Cautionary comments:
1. There may be a problem with the estimate for the mineral "dust"
concentration. Most researchers use the average crustal ratio to estimate
mineral dust concentrations using elemental concentration data (Al, Fe,
etc.). Surface sand and silt samples that were collected in Oman in the
Wahibah Sands region have distinct, non-crustal ratios. If individual
aerosol samples are comprised of material from distinct sources, including
Oman, then it is not unreasonable for their elemental ratios to differ from
the published "average" crustal ratio that is used in most aerosol studies.
2. The amount of Ti in all the aerosol samples was small, despite there
being a reasonable amount of dust material in most samples. The peaks for
Cr and Ti overlap in the neutron activation short irradiation analysis and
if significant quantities of Cr are present, this will interfere with the Ti
analysis. With the exception of one sample, the Ti values are at or below
the detection limit. The sole value above the detection limit was corrected
for the Cr contribution using a correction based on the Cr values from the
long irradiations. The correction changed the Ti value by less than 5%.
The Ti data flagged as being at or below the detection limit was not
corrected for possible Cr interference.
</pre>
<pre><h2>Data management office notes on supplementary fields - aerosols data</h2>
<b>lat, lon</b>
A nominal ship location is given in lat/lon. The location is the noon
position most near the middle of the sampling period, e.g. for a sample
which was pumped intermittently from Jan. 3 - 5, the location is given for
noon, Jan. 4. Intended as an aid to understanding, not a discrete location.
<b>date_begin, date_end</b>
We have included the start and stop day for each sample which we
believe constrains the sample time about as well as is useful for these
data. We also have pump volume and thus a mean concentration of dust
per cubic meter of air for that time frame. The actual number of hours
sampled during a time block (number of days) is complicated to
present. Pumps were turned on and off repetitively depending upon ship
maneuvers and relative wind direction (to prevent ship exhaust
contamination). Also, the total number of hours the pumps were on is a
less useful measure than pump volume, because of the variability in
pump efficiency due to changing barometric pressures. An hours worth of
pumping does not always yield the same volume of air.
</pre>
from Cruise: TT054 <pre>
<b>PI:</b> Neil Tindale
<b>of:</b> Texas A&M University
<b>dataset:</b> Aerosols, short irradiation neutron activation analysis
<b>dates:</b> January 08, 1995 to December 25, 1995
<b>location:</b> N: 23.7953 S: 09.9776 W: 57.2609 E: 68.7641
<b>project:</b> Arabian Sea
<b>ship:</b> Thomas Thompson
</pre>
<pre>
<h2>Dr. Neil Tindale, Texas A & M Univ.
JGOFS/Arabian Sea
Aerosols, short and long irradiation neutron activation analysis
</h2>
<b>JGOFS Arabian Sea Aerosol Data</b>
This mineral aerosol concentration data set is from samples collected
during several cruises on the R/V Thomas Thompson during the JGOFS
Arabian Sea field program. The data set includes the sampling period
for each sample; the "Day of Year", yrday, number for the start of the
sampling period for each sample; and the concentration of different
elements for each sample, in micrograms per cubic meter. For the
sampling period, "nd" is used as a filler to indicate "no data" gaps in
the data array. The dust values are estimated using aluminum
concentrations determined by neutron activation analysis. While most
samples cover a multi-day period, we only have data for about 150
days. We didn't participate in all of the cruises and, on the cruises
where samples were collected, often sampling conditions were less than
ideal (bad weather, ship maneuvering, relative wind from astern etc.).
A few samples that were collected showed obvious contamination from
local sources, presumably from material from the R/V Thompson or from
nearby fishing boats, and these samples were discarded and are not
included in the data set. While the sampling period represents the
period during which sampling occurred, sampling was usually not
continuous. Sampling was frequently stopped, whenever sampling
conditions were no longer suitable. Thus the concentration value at
any particular date represents a time integrated sample which is
usually non-continuous.
Cautionary comments:
1. There may be a problem with the estimate for the mineral "dust"
concentration. Most researchers use the average crustal ratio to estimate
mineral dust concentrations using elemental concentration data (Al, Fe,
etc.). Surface sand and silt samples that were collected in Oman in the
Wahibah Sands region have distinct, non-crustal ratios. If individual
aerosol samples are comprised of material from distinct sources, including
Oman, then it is not unreasonable for their elemental ratios to differ from
the published "average" crustal ratio that is used in most aerosol studies.
2. The amount of Ti in all the aerosol samples was small, despite there
being a reasonable amount of dust material in most samples. The peaks for
Cr and Ti overlap in the neutron activation short irradiation analysis and
if significant quantities of Cr are present, this will interfere with the Ti
analysis. With the exception of one sample, the Ti values are at or below
the detection limit. The sole value above the detection limit was corrected
for the Cr contribution using a correction based on the Cr values from the
long irradiations. The correction changed the Ti value by less than 5%.
The Ti data flagged as being at or below the detection limit was not
corrected for possible Cr interference.
</pre>
<pre><h2>Data management office notes on supplementary fields - aerosols data</h2>
<b>lat, lon</b>
A nominal ship location is given in lat/lon. The location is the noon
position most near the middle of the sampling period, e.g. for a sample
which was pumped intermittently from Jan. 3 - 5, the location is given for
noon, Jan. 4. Intended as an aid to understanding, not a discrete location.
<b>date_begin, date_end</b>
We have included the start and stop day for each sample which we
believe constrains the sample time about as well as is useful for these
data. We also have pump volume and thus a mean concentration of dust
per cubic meter of air for that time frame. The actual number of hours
sampled during a time block (number of days) is complicated to
present. Pumps were turned on and off repetitively depending upon ship
maneuvers and relative wind direction (to prevent ship exhaust
contamination). Also, the total number of hours the pumps were on is a
less useful measure than pump volume, because of the variability in
pump efficiency due to changing barometric pressures. An hours worth of
pumping does not always yield the same volume of air.
</pre>
Specified by the Principal Investigator(s)
asNeeded
7.x-1.1
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
Pump Air Sampler
Pump Air Sampler
PI Supplied Instrument Name: Pump Air Sampler PI Supplied Instrument Description:Air sampling pumps, were mounted in a 6-m shipping container located on the foredeck's container storage rack. The air sampler was a HiVol system loaded with a single unwashed Whatman 41t "lter and with a #ow rate of&1.2}1.4 m3 min~1. Instrument Name: Pump Air Sampler Instrument Short Name:Pump Air Sampler Instrument Description: A Pump Air Sampler is an instrument that continuously supplies a flow of air either to an analytical instrument, over a sensor, through filters or from which discrete samples may be drawn for subsequent analysis. This instrument designation is used when specific make and model are not known. Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/58/
Cruise: TT043
TT043
R/V Thomas G. Thompson
Community Standard Description
International Council for the Exploration of the Sea
R/V Thomas G. Thompson
vessel
TT043
Michael R. Roman
University of Maryland Center for Environmental Science
http://osprey.bcodmo.org/datasetDeployment.cfm?ddid=2580&did=353&flag=view
Report describing TT043
Cruise: TT044
TT044
R/V Thomas G. Thompson
Community Standard Description
International Council for the Exploration of the Sea
R/V Thomas G. Thompson
vessel
TT044
Kenneth H. Brink
Woods Hole Oceanographic Institution
Cruise: TT045
TT045
R/V Thomas G. Thompson
Community Standard Description
International Council for the Exploration of the Sea
R/V Thomas G. Thompson
vessel
TT045
John F. Marra
Lamont-Doherty Earth Observatory
Cruise: TT048
TT048
R/V Thomas G. Thompson
Community Standard Description
International Council for the Exploration of the Sea
R/V Thomas G. Thompson
vessel
TT048
Kenneth H. Brink
Woods Hole Oceanographic Institution
Cruise: TT049
TT049
R/V Thomas G. Thompson
Community Standard Description
International Council for the Exploration of the Sea
R/V Thomas G. Thompson
vessel
TT049
Richard Barber
Duke University
Cruise: TT050
TT050
R/V Thomas G. Thompson
Community Standard Description
International Council for the Exploration of the Sea
R/V Thomas G. Thompson
vessel
TT050
Sharon L. Smith
University of Miami
Cruise: TT051
TT051
R/V Thomas G. Thompson
Community Standard Description
International Council for the Exploration of the Sea
R/V Thomas G. Thompson
vessel
TT051
Dr Robert Arnone
U.S. Naval Research Laboratory
Cruise: TT053
TT053
R/V Thomas G. Thompson
Community Standard Description
International Council for the Exploration of the Sea
R/V Thomas G. Thompson
vessel
TT053
William M. Balch
University of Miami
Cruise: TT054
TT054
R/V Thomas G. Thompson
Community Standard Description
International Council for the Exploration of the Sea
R/V Thomas G. Thompson
vessel
TT054
Wilford D. Gardner
Texas A&M University
R/V Thomas G. Thompson
Community Standard Description
International Council for the Exploration of the Sea
R/V Thomas G. Thompson
vessel