http://lod.bco-dmo.org/id/dataset/3859
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
2013-01-18
ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
ISO 19115-2:2009(E)
Particulate total mercury and monomethylmercury - US GEOTRACES NATZ from R/V Knorr KN199-04, KN204-01 in the subtropical North Atlantic Ocean from 2010-2011 (U.S. GEOTRACES NAT project)
2013-03-05
publication
2013-03-05
revision
BCO-DMO Linked Data URI
2013-03-05
creation
http://lod.bco-dmo.org/id/dataset/3859
Carl Lamborg
Woods Hole Oceanographic Institution
principalInvestigator
Chad Hammerschmidt
Wright 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: Lamborg, C., Hammerschmidt, C. (2013) Particulate total mercury and monomethylmercury - US GEOTRACES NATZ from R/V Knorr KN199-04, KN204-01 in the subtropical North Atlantic Ocean from 2010-2011 (U.S. GEOTRACES NAT project). Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 01 Jan 2013) Version Date 2013-03-05 [if applicable, indicate subset used]. http://lod.bco-dmo.org/id/dataset/3859 [access date]
Particulate total mercury and monomethylmercury - US GEOTRACES NATZ Dataset Description: <p>Particulate total mercury and monomethylmercury across the US GEOTRACES North Atlantic Zonal Section.</p>
<p>This dataset includes concentrations of particulate total mercury and particulate monomethylmercury from surface water to bottom water at 22 stations across the cruise path. Particle samples were collected with a multiple-unit large-volume in situ filtration system that collected a size fraction between 1 and 51 um.</p> Methods and Sampling: <p>- Sample collection: Bishop et al., 2012.&nbsp; Samples were collected from the surface at 30 meters to the ocean floor, as deep as 5800 meters. Approximately 16 depths were sampled at each station.&nbsp; Used the ODF Niskin rosette.</p>
<p>- Particulate samples were frozen and transported to Wright State University (Dayton, OH) where they were analyzed within 3 months of collection. Filter punches were digested in acid-cleaned polypropylene containers with 8 mL of 2N HNO3 (Baker Instra-Analyzed).&nbsp; After analysis of MMHg, an aliquot of digestate was oxidized with BrCl solution for total Hg determination: Hammerschmidt &amp; Fitzgerald, 2006.</p>
<p>- HgT analysis: <br />
&nbsp;&nbsp;&nbsp; Fitzgerald &amp; Gill, 1979; Bloom &amp; Fitzgerald, 1988; Bloom, 1989<br />
&nbsp;&nbsp;&nbsp; Tekran Model 2500 CVAFS Mercury Detector<br />
&nbsp;&nbsp;&nbsp; Detection limit: 0.03 pM<br />
&nbsp;&nbsp;&nbsp; Procedural duplicates: 3 &plusmn; 3 relative percent difference (n=18)<br />
&nbsp;&nbsp;&nbsp; Recovery of known additions: 106% recovery (n=1)</p>
<p>-MMHg analysis: <br />
&nbsp;&nbsp;&nbsp; Tseng et al., 2004<br />
&nbsp;&nbsp;&nbsp; Tekran Model 2500 CVAFS Mercury Detector <br />
&nbsp;&nbsp;&nbsp; Detection limit: 2 fM<br />
&nbsp;&nbsp;&nbsp; Filter digestates contained insufficient analyte for analysis of either procedural duplicates or recovery of known additions. Particulate MMHg concentrations were &lt; 4 fM and required the maximum amount of sample volume to obtain a signal.</p>
Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-0927274 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=0927274
Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-1132515 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=1132515
Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-0928191 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=0928191
Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-1132480 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=1132480
completed
Carl Lamborg
Woods Hole Oceanographic Institution
831-459-2908
A442 Earth & Marine Sciences 1156 High Street
Santa Cruz
CA
95064
USA
clamborg@ucsc.edu
pointOfContact
Chad Hammerschmidt
Wright State University
937-775-3457
3640 Colonel Glenn Highway 272B Brehm Lab
Dayton
OH
45435
USA
chad.hammerschmidt@wright.edu
pointOfContact
asNeeded
Dataset Version: 01 Jan 2013
Unknown
cruise_id
cruise_part
station_GEOTRC
sample_GEOTRC
lat
lon
depth_n
Hg_total
Hg_total_flag
MMHg
MMHg_flag
comment
cast_GEOTRC
event_GEOTRC
sample_bottle_GEOTRC
bottle_GEOTRC
depth_GEOTRC_CTD
BTL_ISO_DateTime_UTC
Cold Vapor Atomic Fluorescence Spectrophotometer
McLane Pump
Trace Metal Bottle
theme
None, User defined
Cruise identfier
cruise_part
station
sample identification
latitude
longitude
depth nominal
trace metal concentration
flag
comments
cast
event
Niskin bottle number
bottle
depth
ISO_DateTime_UTC
featureType
BCO-DMO Standard Parameters
Cold Vapor Atomic Fluorescence Spectrophotometer
McLane Pump
Trace Metal Bottle
instrument
BCO-DMO Standard Instruments
KN199-04
KN204-01
service
Deployment Activity
Subtropical northern Atlantic Ocean
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 North Atlantic Transect (GA03)
https://www.geotraces.org/
U.S. GEOTRACES North Atlantic Transect (GA03)
<p><em>Much of this text appeared in an article published in OCB News, October 2008, by the OCB Project Office.</em></p>
<p>The first U.S. GEOTRACES Atlantic Section will be specifically centered around a sampling cruise to be carried out in the North Atlantic in 2010. Ed Boyle (MIT) and Bill Jenkins (WHOI) organized a three-day planning workshop that was held September 22-24, 2008 at the Woods Hole Oceanographic Institution. The main goal of the workshop, sponsored by the National Science Foundation and the U.S. GEOTRACES Scientific Steering Committee, was to design the implementation plan for the first U.S. GEOTRACES Atlantic Section. The primary cruise design motivation was to improve knowledge of the sources, sinks and internal cycling of Trace Elements and their Isotopes (TEIs) by studying their distributions along a section in the North Atlantic (Figure 1). The North Atlantic has the full suite of processes that affect TEIs, including strong meridional advection, boundary scavenging and source effects, aeolian deposition, and the salty Mediterranean Outflow. The North Atlantic is particularly important as it lies at the "origin" of the global Meridional Overturning Circulation.</p>
<p>It is well understood that many trace metals play important roles in biogeochemical processes and the carbon cycle, yet very little is known about their large-scale distributions and the regional scale processes that affect them. Recent advances in sampling and analytical techniques, along with advances in our understanding of their roles in enzymatic and catalytic processes in the open ocean provide a natural opportunity to make substantial advances in our understanding of these important elements. Moreover, we are motivated by the prospect of global change and the need to understand the present and future workings of the ocean's biogeochemistry. The GEOTRACES strategy is to measure a broad suite of TEIs to constrain the critical biogeochemical processes that influence their distributions. In addition to these "exotic" substances, more traditional properties, including macronutrients (at micromolar and nanomolar levels), CTD, bio-optical parameters, and carbon system characteristics will be measured. The cruise starts at Line W, a repeat hydrographic section southeast of Cape Cod, extends to Bermuda and subsequently through the North Atlantic oligotrophic subtropical gyre, then transects into the African coast in the northern limb of the coastal upwelling region. From there, the cruise goes northward into the Mediterranean outflow. The station locations shown on the map are for the "fulldepth TEI" stations, and constitute approximately half of the stations to be ultimately occupied.</p>
<p><em>Figure 1. The proposed 2010 Atlantic GEOTRACES cruise track plotted on dissolved oxygen at 400 m depth. Data from the World Ocean Atlas (Levitus et al., 2005) were plotted using Ocean Data View (courtesy Reiner Schlitzer). [click on the image to view a larger version]</em><br />
<a href="http://bcodata.whoi.edu/US_GEOTRACES/AtlanticSection/GEOTRACES_Atl_stas.jpg" target="_blank"><img alt="" src="https://datadocs.bco-dmo.org/d2/US_GEOTRACES/AtlanticSection/GEOTRACES_Atl_stas.jpg" style="width:350px" /></a></p>
<p>Hydrography, CTD and nutrient measurements will be supported by the Ocean Data Facility (J. Swift) at Scripps Institution of Oceanography and funded through NSF Facilities. They will be providing an additional CTD rosette system along with nephelometer and LADCP. A trace metal clean Go-Flo Rosette and winch will be provided by the group at Old Dominion University (G. Cutter) along with a towed underway pumping system.</p>
<p>The North Atlantic Transect cruise began in 2010 with KN199 leg 4 (station sampling) and leg 5 (underway sampling only) (Figure 2).</p>
<p><a href="http://bcodata.whoi.edu//US_GEOTRACES/AtlanticSection/Cruise_Report_for_Knorr_199_Final_v3.pdf" target="_blank">KN199-04 Cruise Report (PDF)</a></p>
<p><em>Figure 2. The red line shows the cruise track for the first leg of the US Geotraces North Atlantic Transect on the R/V Knorr in October 2010. The rest of the stations (beginning with 13) will be completed in October-December 2011 on the R/V Knorr (courtesy of Bill Jenkins, Chief Scientist, GNAT first leg). [click on the image to view a larger version]</em><br />
<a href="http://bcodata.whoi.edu/US_GEOTRACES/AtlanticSection/GNAT_stationPlan.jpg" target="_blank"><img alt="Atlantic Transect Station location map" src="https://datadocs.bco-dmo.org/d2/US_GEOTRACES/AtlanticSection/GNAT_stationPlan_sm.jpg" style="width:350px" /></a></p>
<p>The section completion effort resumed again in November 2011 with KN204-01A,B (Figure 3).</p>
<p><a href="http://bcodata.whoi.edu//US_GEOTRACES/AtlanticSection/Submitted_Preliminary_Cruise_Report_for_Knorr_204-01.pdf" target="_blank">KN204-01A,B Cruise Report (PDF)</a></p>
<p><em>Figure 3. Station locations occupied on the US Geotraces North Atlantic Transect on the R/V Knorr in November 2011. [click on the image to view a larger version]</em><br />
<a href="http://bcodata.whoi.edu/US_GEOTRACES/AtlanticSection/KN204-01_Stations.png" target="_blank"><img alt="Atlantic Transect/Part 2 Station location map" src="https://datadocs.bco-dmo.org/d2/US_GEOTRACES/AtlanticSection/KN204-01_Stations.png" style="width:350px" /></a></p>
<p>Data from the North Atlantic Transect cruises are available under the Datasets heading below, and consensus values for the SAFe and North Atlantic GEOTRACES Reference Seawater Samples are available from the GEOTRACES Program Office: <a href="http://www.geotraces.org/science/intercalibration/322-standards-and-reference-materials?acm=455_215" target="_blank">Standards and Reference Materials</a></p>
<p><strong>ADCP data</strong> are available from the Currents ADCP group at the University of Hawaii at the links below:<br />
<a href="http://currents.soest.hawaii.edu/uhdas_adcp/year2010.html#kn199_4" target="_blank">KN199-04</a> (leg 1 of 2010 cruise; Lisbon to Cape Verde)<br />
<a href="http://currents.soest.hawaii.edu/uhdas_adcp/year2010.html#kn199_5" target="_blank">KN199-05</a> (leg 2 of 2010 cruise; Cape Verde to Charleston, NC)<br />
<a href="http://currents.soest.hawaii.edu/uhdas_adcp/year2011.html#kn204_01" target="_blank">KN204-01A</a> (part 1 of 2011 cruise; Woods Hole, MA to Bermuda)<br />
<a href="http://currents.soest.hawaii.edu/uhdas_adcp/year2011.html#kn204_02" target="_blank">KN204-01B</a> (part 2 of 2011 cruise; Bermuda to Cape Verde)</p>
U.S. GEOTRACES NAT
largerWorkCitation
project
eng; USA
oceans
Subtropical northern Atlantic Ocean
2013-03-05
Subtropical western and eastern North Atlantic Ocean (GA03)
0
BCO-DMO catalogue of parameters from Particulate total mercury and monomethylmercury - US GEOTRACES NATZ from R/V Knorr KN199-04, KN204-01 in the subtropical North Atlantic Ocean from 2010-2011 (U.S. GEOTRACES NAT 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/32193.rdf
Name: cruise_id
Units: text
Description: <p>Official cruise identifier e.g. KN199-04 = R/V Knorr cruise number 199-04.</p>
http://lod.bco-dmo.org/id/dataset-parameter/32194.rdf
Name: cruise_part
Units: text
Description: <p>identifier for a segment of a leg of a cruise, where a leg may have been broken into parts: For KN204-01: part A = 11/6/2011 to 11/18/2011 (Woods Hole to Bermuda)<br />
part B = 11/19/2011 to 12/11/2011 (Bermuda to Praia, Cabo Verde)</p>
http://lod.bco-dmo.org/id/dataset-parameter/32195.rdf
Name: station_GEOTRC
Units: integer
Description: <p>GEOTRACES station number; ranges from 1 through 12 for KN199-04 and 1 through 24 for KN204-01. Stations 7 and 9 were skipped on KN204-01. PI-supplied values were identical to those in the<br />
intermediate US GEOTRACES master file. Originally submitted as 'sta', this parameter name has been changed to conform to BCO-DMO's GEOTRACES naming conventions.</p>
http://lod.bco-dmo.org/id/dataset-parameter/32196.rdf
Name: sample_GEOTRC
Units: integer
Description: <p>Unique identifying number for US GEOTRACES samples; ranges from 5033 to 6078 for KN199-04 and from 6112 to 8148 for KN204-01. PI-supplied values were identical to those in the <br />intermediate US GEOTRACES master file. Originally submitted as 'sample', this parameter name has been changed to conform to BCO-DMO's GEOTRACES naming conventions.</p>
http://lod.bco-dmo.org/id/dataset-parameter/32197.rdf
Name: lat
Units: decimal degrees
Description: <p>latitude; north is positive</p>
http://lod.bco-dmo.org/id/dataset-parameter/32198.rdf
Name: lon
Units: decimal degrees
Description: <p>longitude; east is positive</p>
http://lod.bco-dmo.org/id/dataset-parameter/32199.rdf
Name: depth_n
Units: meters
Description: <p>nominal sample depth; provided in original data submission.</p>
http://lod.bco-dmo.org/id/dataset-parameter/32200.rdf
Name: Hg_total
Units: picomoles/liter
Description: <p>concentration of total mercury</p>
http://lod.bco-dmo.org/id/dataset-parameter/32201.rdf
Name: Hg_total_flag
Units: integer
Description: <p>total mercury quality flag:<br />
2) ok<br />
3) questionable<br />
4) bad analysis<br />
5) sample lost<br />
6) mean of replicates<br />
9) sample was not collected for Hg analysis</p>
http://lod.bco-dmo.org/id/dataset-parameter/32202.rdf
Name: MMHg
Units: femtomoles/liter
Description: <p>concentration of monomethylmercury</p>
http://lod.bco-dmo.org/id/dataset-parameter/32203.rdf
Name: MMHg_flag
Units: integer
Description: <p>monomethylmercury quality flag:<br />
2) ok<br />
3) questionable<br />
4) bad analysis<br />
5) sample lost<br />
6) mean of replicates</p>
http://lod.bco-dmo.org/id/dataset-parameter/32204.rdf
Name: comment
Units: unknown
Description: <p>comment pertaining to sample.</p>
http://lod.bco-dmo.org/id/dataset-parameter/33152.rdf
Name: cast_GEOTRC
Units: dimensionless
Description: <p>Cast identifier numbered consecutively within a station. Values were added from the intermediate US GEOTRACES master file (see Processing Description).</p>
http://lod.bco-dmo.org/id/dataset-parameter/33153.rdf
Name: event_GEOTRC
Units: dimensionless
Description: <p>Unique identifying number for US GEOTRACES sampling events; ranges from 2001 to 2225 for KN199-04 events and from 3001 to 3282 for KN204-01 events. <br />Values were added from the intermediate US GEOTRACES master file (see Processing Description).</p>
http://lod.bco-dmo.org/id/dataset-parameter/33154.rdf
Name: sample_bottle_GEOTRC
Units: dimensionless
Description: <p>Unique identification numbers given to samples taken from bottles; ranges from 1 to 24; often used synonymously with bottle number. <br />Values were added from the intermediate US GEOTRACES master file (see Processing Description).</p>
http://lod.bco-dmo.org/id/dataset-parameter/33155.rdf
Name: bottle_GEOTRC
Units: dimensionless
Description: <p>Alphanumeric characters identifying bottle type (e.g. NIS representing Niskin and GF representing GOFLO) and position on a CTD rosette. <br />Values were added from the intermediate US GEOTRACES master file (see Processing Description).</p>
http://lod.bco-dmo.org/id/dataset-parameter/33156.rdf
Name: depth_GEOTRC_CTD
Units: meters
Description: <p>Observation/sample depth in meters; calculated from CTD pressure. Values were added from the intermediate US GEOTRACES master file (see Processing Description).</p>
http://lod.bco-dmo.org/id/dataset-parameter/33157.rdf
Name: BTL_ISO_DateTime_UTC
Units: YYYY-MM-DDTHH:MM:SS[.xx][+/-TZ]
Description: <p>Date and time (UTC) variable recorded at the bottle sampling time in ISO compliant format. Values were added from the intermediate US GEOTRACES master file (see Processing Description).<br /><br />
This standard is based on ISO 8601:2004(E) and takes on the following form: 2009-08-30T14:05:00[.xx]Z (UTC time)</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
26561
https://datadocs.bco-dmo.org/file/p99nDy9Cz8pME7/Hg_partic_joined.csv
Hg_partic_joined.csv
Primary data file for dataset ID 3859
download
https://osprey.bco-dmo.org/dataset/3859/data/download
download
onLine
dataset
<p>- Sample collection: Bishop et al., 2012.&nbsp; Samples were collected from the surface at 30 meters to the ocean floor, as deep as 5800 meters. Approximately 16 depths were sampled at each station.&nbsp; Used the ODF Niskin rosette.</p>
<p>- Particulate samples were frozen and transported to Wright State University (Dayton, OH) where they were analyzed within 3 months of collection. Filter punches were digested in acid-cleaned polypropylene containers with 8 mL of 2N HNO3 (Baker Instra-Analyzed).&nbsp; After analysis of MMHg, an aliquot of digestate was oxidized with BrCl solution for total Hg determination: Hammerschmidt &amp; Fitzgerald, 2006.</p>
<p>- HgT analysis: <br />
&nbsp;&nbsp;&nbsp; Fitzgerald &amp; Gill, 1979; Bloom &amp; Fitzgerald, 1988; Bloom, 1989<br />
&nbsp;&nbsp;&nbsp; Tekran Model 2500 CVAFS Mercury Detector<br />
&nbsp;&nbsp;&nbsp; Detection limit: 0.03 pM<br />
&nbsp;&nbsp;&nbsp; Procedural duplicates: 3 &plusmn; 3 relative percent difference (n=18)<br />
&nbsp;&nbsp;&nbsp; Recovery of known additions: 106% recovery (n=1)</p>
<p>-MMHg analysis: <br />
&nbsp;&nbsp;&nbsp; Tseng et al., 2004<br />
&nbsp;&nbsp;&nbsp; Tekran Model 2500 CVAFS Mercury Detector <br />
&nbsp;&nbsp;&nbsp; Detection limit: 2 fM<br />
&nbsp;&nbsp;&nbsp; Filter digestates contained insufficient analyte for analysis of either procedural duplicates or recovery of known additions. Particulate MMHg concentrations were &lt; 4 fM and required the maximum amount of sample volume to obtain a signal.</p>
Specified by the Principal Investigator(s)
<p>&quot;lt_DL&quot; indicates that a sample was below the method detection limit.<br />
Sample volumes were used to calculate either picomolar or femtomolar concentrations of different mercury species.</p>
<p><b>Related files and references:&nbsp; </b><br />
<br />
Bishop, J.K.B., Lam, P.J., Wood, T.J. 2012. Getting good particles: Accurate sampling of particles by large volume in-situ filtration.<br />
<br />
Bloom, N. 1989. Determination of picogram levels of methylmercury by aqueous phase ethylation, followed by cryogenic gas-chromatography with cold vapor atomic fluorescence detection. Can. J. Fish. Aquat. Sci. 46, 1131-1140.<br />
<br />
Bloom, N.S., Fitzgerald, W.F. 1988. Determination of volatile mercury species at the picogram level by low-temperature gas chromatography with cold-vapor atomic fluorescence detection. Anal. Chim Acta 208, 151-161.<br />
<br />
Fitzgerald, W.F., Gill, G.A. 1979. Subnanogram determination of mercury by two-stage gold amalgamation applied to atmospheric analysis. Anal. Chem. 51, 1714-1720.<br />
<br />
Hammerschmidt, C.R., Fitzgerald, W. F.&nbsp; 2006.&nbsp; Bioaccumulation and trophic transfer of methylmercury in Long Island Sound. Arch. Environ. Contam. Toxicol. 51, 416-424.<br />
<br />
Tseng, C.-M., Hammerschmidt, C.R., Fitzgerald, W.F. 2004. Determination of methylmercury in environmental matrixes by on-line flow injection and atomic fluorescence spectrometry. Anal. Chem. 76, 7131-7136.</p>
<p><b>Additional GEOTRACES Processing:</b><br />
After the data were submitted to the International Data Management Office, BODC, the office noticed that important identifying information was missing in many datasets. With the agreement of BODC and the US GEOTRACES lead PIs, 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: station_GEOTRC, cast_GEOTRC (bottle and pump data only), event_GEOTRC, sample_GEOTRC, sample_bottle_GEOTRC (bottle data only), bottle_GEOTRC (bottle data only), depth_GEOTRC_CTD (bottle data only), depth_GEOTRC_CTD_rounded (bottle data only), BTL_ISO_DateTime_UTC (bottle data only), and GeoFish_id (GeoFish data only). This added information will facilitate subsequent analysis and inter comparison of the datasets.<br />
<br />
Bottle parameters in the master file were taken from the GT-C_Bottle_GT10, GT-C_Bottle_GT11, ODF_Bottle_GT10, and ODF_Bottle_GT11 datasets. Non-bottle parameters, including those from GeoFish tows, Aerosol sampling, and McLane Pumps, were taken from the Event_Log_GT10 and Event_Log_GT11 datasets. McLane pump cast numbers missing in event logs were taken from the Particulate Th-234 dataset submitted by Ken Buesseler.<br />
<br />
A standardized BCO-DMO method (called &quot;join&quot;) 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. <br />
<br />
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.<br />
<br />
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
Cold Vapor Atomic Fluorescence Spectrophotometer
Cold Vapor Atomic Fluorescence Spectrophotometer
PI Supplied Instrument Name: Cold Vapor Atomic Fluorescence Spectrophotometer PI Supplied Instrument Description:Tekran Model 2500 CVAFS Mercury Detector Instrument Name: Cold Vapor Atomic Fluorescence Spectrophotometer Instrument Short Name:CVAFS Instrument Description: A Cold Vapor Atomic Fluorescent Spectrophotometer (CVAFS) is an instrument used for quantitative determination of volatile heavy metals, such as mercury. CVAFS make use of the characteristic of mercury that allows vapor measurement at room temperature. Mercury atoms in an inert carrier gas are excited by a collimated UV light source at a particular wavelength. As the atoms return to their non-excited state they re-radiate their absorbed energy at the same wavelength. The fluorescence may be detected using a photomultiplier tube or UV photodiode.
McLane Pump
McLane Pump
PI Supplied Instrument Name: McLane Pump 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.
Trace Metal Bottle
Trace Metal Bottle
PI Supplied Instrument Name: Trace Metal Bottle PI Supplied Instrument Description:ODF (Scripps Ocean Data Facility) rosette with twelve 30-liter Niskin bottles Instrument Name: Trace Metal Bottle Instrument Short Name:TM Bottle Instrument Description: Trace metal (TM) clean rosette bottle used for collecting trace metal clean seawater samples. Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/30/
Cruise: KN199-04
KN199-04
R/V Knorr
Community Standard Description
International Council for the Exploration of the Sea
R/V Knorr
vessel
KN199-04
William J. Jenkins
Woods Hole Oceanographic Institution
http://bcodata.whoi.edu/US_GEOTRACES/AtlanticSection/Cruise_Report_for_Knorr_199_Final_v3.pdf
Report describing KN199-04
Cruise: KN204-01
KN204-01
R/V Knorr
Community Standard Description
International Council for the Exploration of the Sea
R/V Knorr
vessel
KN204-01
Edward A. Boyle
Massachusetts Institute of Technology
http://bcodata.whoi.edu/US_GEOTRACES/AtlanticSection/STS_Prelim_GT11_Doc.pdf
Report describing KN204-01
R/V Knorr
Community Standard Description
International Council for the Exploration of the Sea
R/V Knorr
vessel