http://lod.bco-dmo.org/id/dataset/675444
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
2017-01-20
ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
ISO 19115-2:2009(E)
Particulate Po-210 and Pb-210 data from US GEOTRACES East Pacific Zonal Transect from R/V Thomas G. Thompson TN303, from Peru to Tahiti, October to December 2013 (U.S. GEOTRACES EPZT project)
2017-01-24
publication
2017-01-24
revision
BCO-DMO Linked Data URI
2017-01-24
creation
http://lod.bco-dmo.org/id/dataset/675444
Gillian Stewart
Queens College
principalInvestigator
Mark Baskaran
Wayne State 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: Stewart, G., Baskaran, M. (2017) Particulate Po-210 and Pb-210 data from US GEOTRACES East Pacific Zonal Transect from R/V Thomas G. Thompson TN303, from Peru to Tahiti, October to December 2013 (U.S. GEOTRACES EPZT project). Biological and Chemical Oceanography Data Management Office (BCO-DMO). Version Date 2017-01-24 [if applicable, indicate subset used]. http://lod.bco-dmo.org/id/dataset/675444 [access date]
Particulate Po-210 and Pb-210 data from US GEOTRACES East Pacific Zonal Transect-2013 Dataset Description: Methods and Sampling: <p><strong>Sampling:</strong></p>
<p>Small (1-51 µm) and large (&gt; 51 µm) particles for particulate 210Po and 210Pb analyses were collected at 8 stations (5 super stations, 1 shelf station, and 2 full station) using McLane Research in situ pumps that had been modified to accommodate two flow paths (Ohnemus and Lam, 2015). At super stations, three casts (shallow, mid, and deep) were deployed to collect a 24-depth profile. At full stations, one shallow and one deep cast&nbsp;was deployed while one cast was deployed at shelf station. A Seabird 19plus CTD was deployed to verify target depths during deployment.</p>
<p>Filter holders (142 mm diameter) had two stages for two sized particles with multiple baffle systems for allowing even particle distribution (Bishop et al., 2012). Two-sized particles were collected on 51 µm pore size Sefar polyester mesh prefilter followed by paired 1 µm Whatman QMA quartz fiber filters. All filters and filter holders were previously acid leached as recommended in the GEOTRACES sample and sample-handing Protocols (Cutter et al., 2014).</p>
<p>The “dipped blank” filters were also deployed during each cast, exposed to seawater for the length of the pumping period, and processed and analyzed as regular samples. A total of 28 dipped blank filters were used for process blank subtraction.</p>
<p><strong>Analytical Methodology:</strong></p>
<p>At each depth, we got a ~ 16.4% subsample of the 1 µm QMA filter and a 37.5-62.5% subsample of the 53 µm polyester prefilter. Filters were digested using a mixture of strong acids (i.e. HCl, HNO3) after being spiked with a pre-calibrated 209Po tracer and stable lead carrier to monitor the losses during sample processing. The residual filter material was removed from the solution after being rinsed 3-5 times with strong acids. The solution was evaporated to near-dryness and then made in 0.5 M HCl, during which ascorbic acid was added to reduce the Fe(III). Polonium isotopes were extracted from the solution by depositing onto a silver disc (Flynn, 1968). Sliver discs (purity &gt; 99.99%), 2 cm in diameter, were cleaned with a commercial silver polish, ethanol, and Millipore water. Only one side of the silver disc was for deposition with the other side being covered by electronic spray. After deposition, the activities of 209Po and 210Po were measured using Alpha Analyst Integrated Alpha Spectrometer (Canberra Inc.). The plating solution was then run through AG-18 anion exchange resin to remove any remaining polonium isotopes (Sarin et al., 1992), re-spiked with 209Po tracer, and stored for at least 6 months to allow for 210Po ingrowth. The samples were reanalyzed for 210Pb by re-plating of 210Po on a new sliver disc. After second plating, aliquots were taken for Pb recovery determination by measuring stable lead concentrations using Inductively Coupled Plasma-Mass Spectrometry (ICP-MS). The determination of the initial activities of 210Po and 210Pb in the sample at the time of collection involved the correction for decay and ingrowth between the time of sample collection and processing, chemical recoveries of Po and Pb, and dipped blank and detector background subtraction(Rigaud et al., 2013). The uncertainty (median) of 210Pb activity at the time of collection is about 6.5% and 8.8% in small and large particles, respectively. In contrast, the uncertainty (median) of 210Po is about 5.3% and 7.1% in small and large particles, respectively.</p>
Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-1237108 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=1237108
completed
Gillian Stewart
Queens College
718-997-3104
School of Earth and Environmental Sciences Science Bldg E-218
Queens
NY
11367
Gillian.Stewart@qc.cuny.edu
pointOfContact
Mark Baskaran
Wayne State University
313-577-3262
Department of Geology 0224 Old Main
Detroit
MI
48202
USA
Baskaran@wayne.edu
pointOfContact
asNeeded
Unknown
CRUISE_ID
STNNBR
BTMDEPTH
PUMP_LAT
PUMP_LON
CASTNO
GEOTRC_EVENTNO
EVENT_LAT
EVENT_LON
ISO_DATETIME_UTC_START_EVENT
ISO_DateTime_UTC
GEOTRC_SAMPNO
DEPTH
DEPTH_MIN
DEPTH_MAX
Po_SP_CONC_PUMP
Po_SP_CONC_PUMP_STDEV
Po_SP_CONC_PUMP_QF
Pb_SP_CONC_PUMP
Pb_SP_CONC_PUMP_STDEV
Pb_SP_CONC_PUMP_QF
Po_LP_CONC_PUMP
Po_LP_CONC_PUMP_STDEV
Po_LP_CONC_PUMP_QF
Pb_LP_CONC_PUMP
Pb_LP_CONC_PUMP_STDEV
Pb_LP_CONC_PUMP_QF
Alpha Analyst Integrated Alpha Spectrometer (Canberra Inc.)
theme
None, User defined
Cruise identfier
station
depth_w
latitude
longitude
cast
event
ISO_DateTime_UTC
sample identification
depth
depth_min
depth_max
trace metal concentration
Trace metal conc standard deviation
quality flag
featureType
BCO-DMO Standard Parameters
CTD Sea-Bird SBE 911plus
Inductively Coupled Plasma Mass Spectrometer
Mass Spectrometer
McLane Pump
instrument
BCO-DMO Standard Instruments
TN303
service
Deployment Activity
Eastern Tropical Pacific - Transect from Peru to Tahiti
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. GEOTRACES
http://www.geotraces.org/
U.S. GEOTRACES
GEOTRACES is a SCOR sponsored program; and funding for program infrastructure development is provided by the U.S. National Science Foundation.
GEOTRACES gained momentum following a special symposium, S02: Biogeochemical cycling of trace elements and isotopes in the ocean and applications to constrain contemporary marine processes (GEOSECS II), at a 2003 Goldschmidt meeting convened in Japan. The GEOSECS II acronym referred to the Geochemical Ocean Section Studies To determine full water column distributions of selected trace elements and isotopes, including their concentration, chemical speciation, and physical form, along a sufficient number of sections in each ocean basin to establish the principal relationships between these distributions and with more traditional hydrographic parameters;
* To evaluate the sources, sinks, and internal cycling of these species and thereby characterize more completely the physical, chemical and biological processes regulating their distributions, and the sensitivity of these processes to global change; and
* To understand the processes that control the concentrations of geochemical species used for proxies of the past environment, both in the water column and in the substrates that reflect the water column.
GEOTRACES will be global in scope, consisting of ocean sections complemented by regional process studies. Sections and process studies will combine fieldwork, laboratory experiments and modelling. Beyond realizing the scientific objectives identified above, a natural outcome of this work will be to build a community of marine scientists who understand the processes regulating trace element cycles sufficiently well to exploit this knowledge reliably in future interdisciplinary studies.
Expand "Projects" below for information about and data resulting from individual US GEOTRACES research projects.
U.S. GEOTRACES
largerWorkCitation
program
U.S. GEOTRACES East Pacific Zonal Transect (GP16)
http://www.geotraces.org/
U.S. GEOTRACES East Pacific Zonal Transect (GP16)
<p><strong>From the NSF Award Abstract</strong><br />
The mission of the International GEOTRACES Program (<a href="https://www.geotraces.org/" target="_blank">https://www.geotraces.org/</a>), of which the U.S. chemical oceanography research community is a founding member, is "to identify processes and quantify fluxes that control the distributions of key trace elements and isotopes in the ocean, and to establish the sensitivity of these distributions to changing environmental conditions" (GEOTRACES Science Plan, 2006). In the United States, ocean chemists are currently in the process of organizing a zonal transect in the eastern tropical South Pacific (ETSP) from Peru to Tahiti as the second cruise of the U.S.GEOTRACES Program. This Pacific section includes a large area characterized by high rates of primary production and particle export in the eastern boundary associated with the Peru Upwelling, a large oxygen minimum zone that is a major global sink for fixed nitrogen, and a large hydrothermal plume arising from the East Pacific Rise. This particular section was selected as a result of open planning workshops in 2007 and 2008, with a final recommendation made by the U.S.GEOTRACES Steering Committee in 2009. It is the first part of a two-stage plan that will include a meridional section of the Pacific from Tahiti to Alaska as a subsequent expedition.</p>
<p>This award provides funding for management of the U.S.GEOTRACES Pacific campaign to a team of scientists from the University of Southern California, Old Dominion University, and the Woods Hole Oceanographic Institution. The three co-leaders will provide mission leadership, essential support services, and management structure for acquiring the trace elements and isotopes samples listed as core parameters in the International GEOTRACES Science Plan, plus hydrographic and nutrient data needed by participating investigators. With this support from NSF, the management team will (1) plan and coordinate the 52-day Pacific research cruise described above; (2) obtain representative samples for a wide variety of trace metals of interest using conventional CTD/rosette and GEOTRACES Sampling Systems; (3) acquire conventional JGOFS/WOCE-quality hydrographic data (CTD, transmissometer, fluorometer, oxygen sensor, etc) along with discrete samples for salinity, dissolved oxygen (to 1 uM detection limits), plant pigments, redox tracers such as ammonium and nitrite, and dissolved nutrients at micro- and nanomolar levels; (4) ensure that proper QA/QC protocols are followed and reported, as well as fulfilling all GEOTRACES Intercalibration protocols; (5) prepare and deliver all hydrographic-type data to the GEOTRACES Data Center (and US data centers); and (6) coordinate cruise communications between all participating investigators, including preparation of a hydrographic report/publication.</p>
<p>Broader Impacts: The project is part of an international collaborative program that has forged strong partnerships in the intercalibration and implementation phases that are unprecedented in chemical oceanography. The science product of these collective missions will enhance our ability to understand how to interpret the chemical composition of the ocean, and interpret how climate change will affect ocean chemistry. Partnerships include contributions to the infrastructure of developing nations with overlapping interests in the study area, in this case Peru. There is a strong educational component to the program, with many Ph.D. students carrying out thesis research within the program.</p>
<p><em>Figure 1. The 2013 GEOTRACES EPZT Cruise Track. [click on the image to view a larger version]</em><br />
<a href="http://dmoserv3.whoi.edu/data_docs/GEOTRACES/EPZT/GEOTRACES_EPZT_TN303_CruiseTrack.png" target="_blank"><img alt="" src="https://datadocs.bco-dmo.org/d3/data_docs/GEOTRACES/EPZT/GEOTRACES_EPZT_TN303_CruiseTrack.png" /></a></p>
U.S. GEOTRACES EPZT
largerWorkCitation
project
GEOTRACES - 210Po and 210Pb distribution at Eastern Pacific Interface Regimes
https://osprey.bco-dmo.org/project/641047
GEOTRACES - 210Po and 210Pb distribution at Eastern Pacific Interface Regimes
<p><em>Extracted from the NSF award abstract</em></p>
<p>In 2013, a multi-institutional team of U.S. marine chemists and geochemists will launch a major expedition to the Pacific Ocean to map and study the distribution of trace elements and isotopes as part of the International GEOTRACES Program. Because of their proven value as natural tracers of both sedimentation dynamics and hydrodynamics in the sea, radioactive daughter isotopes in the natural U-Th radionuclide series will be of immense value to all GEOTRACES researchers. In particular the naturally-occurring Pb210/Po210 radioisotope pair would be useful for quantifying rates of particulate scavenging of other trace elements and isotopes of interest in the U.S.GEOTRACES Pacific campaign. This is because these two isotopes are themselves particle-reactive and radioactive, thus providing a natural clock for tracking the vertical transport of other particle-reactive substances.</p>
<p>In this project, researchers at Wayne State University and CUNY Queens College will sample and analyze several hundred dissolved and particulate (large and small) samples for 210Po and 210Pb along the U.S.GEOTRACES Eastern South Pacific section. About two thirds of the samples will be focused at six so-called "super stations" (sites chosen for intensive study), half above the main thermocline and the other half down across the benthic nepheloid layer (the zone of suspended material extending several meters above the seafloor). The depths will be chosen according to regional atmospheric input, ecosystems, and coordinated with sampling by other researchers onboard. The other third will be taken within the hydrothermal plume in the vicinity of the East Pacific Rise. The data will be synthesized according to interface scavenging models by particle types (e.g. fine/colloidal, lithogenic and biogenic). As such, the proposed work will be closely coordinated with that of other U.S.GEOTRACES PIs funded to study other particle-reactive or dissolved trace elements and radionuclide isotopes during the campaign.</p>
<p>BROADER IMPACTS: The broader impacts are closely linked to those of the GEOTRACES Program as a whole: to enhance (1) research infrastructure by providing a broad array of 210Po and 210Pb data useful for biogeochemical scavenging models, (2) education by mentoring graduate and undergraduate students, teaching by example from proposed research, (3) participation of under-represented students interested in careers in the geosciences, (4) research training of graduates in marine radiochemistry, and 5) public dissemination of results through publications, presentations, and on a dedicated public website at Wayne State University.</p>
GEOTRACES EPZT Po Pb
largerWorkCitation
project
eng; USA
oceans
Eastern Tropical Pacific - Transect from Peru to Tahiti
2017-01-24
From projects that focused on the following 2 locations: 1. Eastern Tropical Pacific - Transect from Peru to Tahiti (GP16) 2. Eastern South Pacific
0
BCO-DMO catalogue of parameters from Particulate Po-210 and Pb-210 data from US GEOTRACES East Pacific Zonal Transect from R/V Thomas G. Thompson TN303, from Peru to Tahiti, October to December 2013 (U.S. GEOTRACES EPZT 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/675496.rdf
Name: CRUISE_ID
Units: unitless
Description: <p>Cruise identifier</p>
http://lod.bco-dmo.org/id/dataset-parameter/675497.rdf
Name: STNNBR
Units: unitless
Description: <p>Station number</p>
http://lod.bco-dmo.org/id/dataset-parameter/675498.rdf
Name: BTMDEPTH
Units: meters
Description: <p>Bottom depth</p>
http://lod.bco-dmo.org/id/dataset-parameter/675499.rdf
Name: PUMP_LAT
Units: decimal degrees
Description: <p>Latitude of pump sample; north is positive</p>
http://lod.bco-dmo.org/id/dataset-parameter/675500.rdf
Name: PUMP_LON
Units: decimal degrees
Description: <p>Longitude of pump sample; east is positive</p>
http://lod.bco-dmo.org/id/dataset-parameter/675501.rdf
Name: CASTNO
Units: unitless
Description: <p>Cast number</p>
http://lod.bco-dmo.org/id/dataset-parameter/675502.rdf
Name: GEOTRC_EVENTNO
Units: unitless
Description: <p>GEOTRACES event number</p>
http://lod.bco-dmo.org/id/dataset-parameter/675503.rdf
Name: EVENT_LAT
Units: decimal degrees
Description: <p>Latitude of cast event; north is positive. Values were added from the intermediate US GEOTRACES master file (see Processing Description).</p>
http://lod.bco-dmo.org/id/dataset-parameter/675504.rdf
Name: EVENT_LON
Units: decimal degrees
Description: <p>Longitude of cast event; east is positive. Values were added from the intermediate US GEOTRACES master file (see Processing Description).</p>
http://lod.bco-dmo.org/id/dataset-parameter/675505.rdf
Name: ISO_DATETIME_UTC_START_EVENT
Units: YYYY-MM-DDTHH:MM:SS[.xx]Z
Description: <p>ISO 8601:2004 standard date and time at start of event. Values were added from the intermediate US GEOTRACES master file (see Processing Description).</p>
http://lod.bco-dmo.org/id/dataset-parameter/675506.rdf
Name: ISO_DateTime_UTC
Units: YYYY-MM-DDTHH:MM:SS[.xx]Z
Description: <p>ISO 8601:2004 standard date and time of the midpoint of pumping</p>
http://lod.bco-dmo.org/id/dataset-parameter/675507.rdf
Name: GEOTRC_SAMPNO
Units: unitless
Description: <p>GEOTRACES sample number</p>
http://lod.bco-dmo.org/id/dataset-parameter/675508.rdf
Name: DEPTH
Units: meters
Description: <p>Pump sampling depth</p>
http://lod.bco-dmo.org/id/dataset-parameter/675509.rdf
Name: DEPTH_MIN
Units: meters
Description: <p>minimum sampled depth</p>
http://lod.bco-dmo.org/id/dataset-parameter/675510.rdf
Name: DEPTH_MAX
Units: meters
Description: <p>maximum sampled depth</p>
http://lod.bco-dmo.org/id/dataset-parameter/675511.rdf
Name: Po_SP_CONC_PUMP
Units: 210Po dpm 100L-1
Description: <p>Particulate Po-210; Particulate: = 0.45 um; units: disintegration per minute (dpm) / 100 L of water from pump sample</p>
http://lod.bco-dmo.org/id/dataset-parameter/675512.rdf
Name: Po_SP_CONC_PUMP_STDEV
Units: 210Po dpm 100L-1
Description: <p>Error as standard deviation</p>
http://lod.bco-dmo.org/id/dataset-parameter/675513.rdf
Name: Po_SP_CONC_PUMP_QF
Units: unitless
Description: <p>quality flag: 0 = good; 4 = questionable; 8 = bad</p>
http://lod.bco-dmo.org/id/dataset-parameter/675514.rdf
Name: Pb_SP_CONC_PUMP
Units: 210Pb dpm 100L-1
Description: <p>Particulate Pb-210; Particulate: = 0.45 um; units: disintegration per minute (dpm) / 100 L of water from pump sample</p>
http://lod.bco-dmo.org/id/dataset-parameter/675515.rdf
Name: Pb_SP_CONC_PUMP_STDEV
Units: 210Pb dpm 100L-1
Description: <p>Error as standard deviation</p>
http://lod.bco-dmo.org/id/dataset-parameter/675516.rdf
Name: Pb_SP_CONC_PUMP_QF
Units: unitless
Description: <p>quality flag: 0 = good; 4 = questionable; 8 = bad</p>
http://lod.bco-dmo.org/id/dataset-parameter/675517.rdf
Name: Po_LP_CONC_PUMP
Units: 210Po dpm 100L-1
Description: <p>Particulate Po-210; Particulate: = 0.45 um; units: disintegration per minute (dpm) / 100 L of water from pump sample</p>
http://lod.bco-dmo.org/id/dataset-parameter/675518.rdf
Name: Po_LP_CONC_PUMP_STDEV
Units: 210Po dpm 100L-1
Description: <p>Error as standard deviation</p>
http://lod.bco-dmo.org/id/dataset-parameter/675519.rdf
Name: Po_LP_CONC_PUMP_QF
Units: unitless
Description: <p>quality flag: 0 = good; 4 = questionable; 8 = bad</p>
http://lod.bco-dmo.org/id/dataset-parameter/675520.rdf
Name: Pb_LP_CONC_PUMP
Units: 210Pb dpm 100L-1
Description: <p>Particulate Pb-210; Particulate: = 0.45 um; units: disintegration per minute (dpm) / 100 L of water from pump sample</p>
http://lod.bco-dmo.org/id/dataset-parameter/675521.rdf
Name: Pb_LP_CONC_PUMP_STDEV
Units: 210Pb dpm 100L-1
Description: <p>Error as standard deviation</p>
http://lod.bco-dmo.org/id/dataset-parameter/675522.rdf
Name: Pb_LP_CONC_PUMP_QF
Units: unitless
Description: <p>quality flag: 0 = good; 4 = questionable; 8 = bad</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
29278
https://datadocs.bco-dmo.org/file/VJJWqmNu28jGZZ/PoPb_part_join.csv
PoPb_part_join.csv
Primary data file for dataset ID 675444
download
https://osprey.bco-dmo.org/dataset/675444/data/download
download
onLine
dataset
<p><strong>Sampling:</strong></p>
<p>Small (1-51 µm) and large (&gt; 51 µm) particles for particulate 210Po and 210Pb analyses were collected at 8 stations (5 super stations, 1 shelf station, and 2 full station) using McLane Research in situ pumps that had been modified to accommodate two flow paths (Ohnemus and Lam, 2015). At super stations, three casts (shallow, mid, and deep) were deployed to collect a 24-depth profile. At full stations, one shallow and one deep cast&nbsp;was deployed while one cast was deployed at shelf station. A Seabird 19plus CTD was deployed to verify target depths during deployment.</p>
<p>Filter holders (142 mm diameter) had two stages for two sized particles with multiple baffle systems for allowing even particle distribution (Bishop et al., 2012). Two-sized particles were collected on 51 µm pore size Sefar polyester mesh prefilter followed by paired 1 µm Whatman QMA quartz fiber filters. All filters and filter holders were previously acid leached as recommended in the GEOTRACES sample and sample-handing Protocols (Cutter et al., 2014).</p>
<p>The “dipped blank” filters were also deployed during each cast, exposed to seawater for the length of the pumping period, and processed and analyzed as regular samples. A total of 28 dipped blank filters were used for process blank subtraction.</p>
<p><strong>Analytical Methodology:</strong></p>
<p>At each depth, we got a ~ 16.4% subsample of the 1 µm QMA filter and a 37.5-62.5% subsample of the 53 µm polyester prefilter. Filters were digested using a mixture of strong acids (i.e. HCl, HNO3) after being spiked with a pre-calibrated 209Po tracer and stable lead carrier to monitor the losses during sample processing. The residual filter material was removed from the solution after being rinsed 3-5 times with strong acids. The solution was evaporated to near-dryness and then made in 0.5 M HCl, during which ascorbic acid was added to reduce the Fe(III). Polonium isotopes were extracted from the solution by depositing onto a silver disc (Flynn, 1968). Sliver discs (purity &gt; 99.99%), 2 cm in diameter, were cleaned with a commercial silver polish, ethanol, and Millipore water. Only one side of the silver disc was for deposition with the other side being covered by electronic spray. After deposition, the activities of 209Po and 210Po were measured using Alpha Analyst Integrated Alpha Spectrometer (Canberra Inc.). The plating solution was then run through AG-18 anion exchange resin to remove any remaining polonium isotopes (Sarin et al., 1992), re-spiked with 209Po tracer, and stored for at least 6 months to allow for 210Po ingrowth. The samples were reanalyzed for 210Pb by re-plating of 210Po on a new sliver disc. After second plating, aliquots were taken for Pb recovery determination by measuring stable lead concentrations using Inductively Coupled Plasma-Mass Spectrometry (ICP-MS). The determination of the initial activities of 210Po and 210Pb in the sample at the time of collection involved the correction for decay and ingrowth between the time of sample collection and processing, chemical recoveries of Po and Pb, and dipped blank and detector background subtraction(Rigaud et al., 2013). The uncertainty (median) of 210Pb activity at the time of collection is about 6.5% and 8.8% in small and large particles, respectively. In contrast, the uncertainty (median) of 210Po is about 5.3% and 7.1% in small and large particles, respectively.</p>
Specified by the Principal Investigator(s)
<p>Also see section above. The 210Po and 210Pb activities were corrected for decay, ingrowth, isotope recoveries, dipped blank, and detector background.</p>
<p>All data quality are evaluated as:<br />
0=good quality: no problems noted<br />
4=questionable quality: anomalously high or low<br />
8=bad quality: known issue with sample</p>
<p><strong>BCO-DMO Processing:</strong><br />
- added conventional header with dataset name, PI name, version date<br />
- modified parameter names to conform with BCO-DMO naming conventions<br />
- changed parameter from Po_LP_STDEV to Pb_LP_CONC_PUMP_STDEV<br />
- reduced digits of PUMP_LAT and PUMP_LON from 8 to 4<br />
- replaced blank cells with nd (no data)<br />
- added the following columns by joining the submitted data with an Events Master file: GEOTRC_SAMPNO, GEOTRC_EVENTNO, GEOTRC_INSTR, EVENT_LAT, EVENT_LON, ISO_DATETIME_UTC_START_EVENT, DEPTH_MIN, DEPTH_MAX<br />
- corrected&nbsp;ISO_DateTime_UTC for events #4013 and 4150</p>
<p><strong>Additional GEOTRACES Processing:</strong></p>
<p>As was done for the GEOTRACES-NAT data, BCO-DMO added standard US GEOTRACES information, such as the US GEOTRACES event number, to each submitted dataset lacking this information. To accomplish this, BCO-DMO compiled a 'master' dataset composed of the following parameters:</p>
<p>cruise_id, EXPOCODE,SECT_ID, STNNBR, CASTNO, GEOTRC_EVENTNO, GEOTRC_SAMPNO, GEOTRC_INSTR, SAMPNO, GF_NO, BTLNBR, BTLNBR_FLAG_W, DATE_START_EVENT, TIME_START_EVENT, ISO_DATETIME_UTC_START_EVENT, EVENT_LAT, EVENT_LON, DEPTH_MIN, DEPTH_MAX, BTL_DATE, BTL_TIME, BTL_ISO_DATETIME_UTC, BTL_LAT, BTL_LON, ODF_CTDPRS, SMDEPTH, FMDEPTH, BTMDEPTH, CTDPRS, CTDDEPTH.</p>
<p>This added information will facilitate subsequent analysis and inter-comparison of the datasets.</p>
<p>Bottle parameters in the master file were taken from the GT-C_Bottle and ODF_Bottle datasets. Non-bottle parameters, including those from GeoFish tows, Aerosol sampling, and McLane Pumps, were taken from the TN303 Event Log (version 30 Oct 2014). Where applicable, pump information was taken from the PUMP_Nuts_Sals dataset.</p>
<p>A standardized BCO-DMO method (called "join") was then used to merge the missing parameters to each US GEOTRACES dataset, most often by matching on sample_GEOTRC or on some unique combination of other parameters.</p>
<p>If the master parameters were included in the original data file and the values did not differ from the master file, the original data columns were retained and the names of the parameters were changed from the PI-submitted names to the standardized master names. If there were differences between the PI-supplied parameter values and those in the master file, both columns were retained. If the original data submission included all of the master parameters, no additional columns were added, but parameter names were modified to match the naming conventions of the master file.</p>
<p>See the dataset parameters documentation for a description of which parameters were supplied by the PI and which were added via the join method.</p>
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
PI Supplied Instrument Name: PI Supplied Instrument Description:Used to verify target depths during deployment. Instrument Name: CTD Sea-Bird SBE 911plus Instrument Short Name:CTD SBE 911plus Instrument Description: The Sea-Bird SBE 911 plus is a type of CTD instrument package for continuous measurement of conductivity, temperature and pressure. The SBE 911 plus includes the SBE 9plus Underwater Unit and the SBE 11plus Deck Unit (for real-time readout using conductive wire) for deployment from a vessel. The combination of the SBE 9 plus and SBE 11 plus is called a SBE 911 plus. The SBE 9 plus uses Sea-Bird's standard modular temperature and conductivity sensors (SBE 3 plus and SBE 4). The SBE 9 plus CTD can be configured with up to eight auxiliary sensors to measure other parameters including dissolved oxygen, pH, turbidity, fluorescence, light (PAR), light transmission, etc.). more information from Sea-Bird Electronics Community Standard Description: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0058/
PI Supplied Instrument Name: PI Supplied Instrument Description:Used to measure stable lead concentrations. Instrument Name: Inductively Coupled Plasma Mass Spectrometer Instrument Short Name:ICP Mass Spec Instrument Description: An ICP Mass Spec is an instrument that passes nebulized samples into an inductively-coupled gas plasma (8-10000 K) where they are atomized and ionized. Ions of specific mass-to-charge ratios are quantified in a quadrupole mass spectrometer. Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/LAB15/
Alpha Analyst Integrated Alpha Spectrometer (Canberra Inc.)
Alpha Analyst Integrated Alpha Spectrometer (Canberra Inc.)
PI Supplied Instrument Name: Alpha Analyst Integrated Alpha Spectrometer (Canberra Inc.) PI Supplied Instrument Description:Used to measure 209Po and 210Po activity Instrument Name: Mass Spectrometer Instrument Short Name:Mass Spec Instrument Description: General term for instruments used to measure the mass-to-charge ratio of ions; generally used to find the composition of a sample by generating a mass spectrum representing the masses of sample components. Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/LAB16/
PI Supplied Instrument Name: PI Supplied Instrument Description:Used to collect samples Instrument Name: McLane Pump Instrument Short Name:McLane Pump Instrument Description: McLane pumps sample large volumes of seawater at depth. They are attached to a wire and lowered to different depths in the ocean. As the water is pumped through the filter, particles suspended in the ocean are collected on the filters. The pumps are then retrieved and the contents of the filters are analyzed in a lab.
Cruise: TN303
TN303
R/V Thomas G. Thompson
Community Standard Description
International Council for the Exploration of the Sea
R/V Thomas G. Thompson
vessel
TN303
James W. Moffett
University of Southern California
http://dmoserv3.whoi.edu/data_docs/GEOTRACES/EPZT/GT13_EPZT_ODFReport_All.pdf
Report describing TN303
R/V Thomas G. Thompson
Community Standard Description
International Council for the Exploration of the Sea
R/V Thomas G. Thompson
vessel