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            <gmx:Anchor xlink:href="http://lod.bco-dmo.org/id/dataset/686982.rdf" xlink:actuate="onRequest">Core-top (0-1cm) sediment data collected by monocore from R/V Thomas G. Thompson TN303 (GP16; EPZT) GEOTRACES cruise from November to December 2013 (GEOTRACES EPZT project)</gmx:Anchor>
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            <gco:CharacterString>Cite this dataset as: German, C. R. (2017) Core-top (0-1cm) sediment data collected by monocore from R/V Thomas G. Thompson TN303 (GP16; EPZT) GEOTRACES cruise from November to December 2013 (GEOTRACES EPZT project). Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 06 April 2017) Version Date 2017-04-06 [if applicable, indicate subset used]. http://lod.bco-dmo.org/id/dataset/686982 [access date]</gco:CharacterString>
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        <gco:CharacterString>Core-top (0-1cm) sediment data from GEOTRACES EPZT (GP16) cruise Dataset Description: &amp;lt;p&amp;gt;Core-top (0-1cm) sediment data from monocores collected on the GEOTRACES EPZT (GP16; TN303) cruise.&amp;lt;/p&amp;gt; Methods and Sampling: &amp;lt;p&amp;gt;On the TN303 cruise, attempts to collect mono-cores were made during the final deep cast of the ODF CTD rosette at each station except Station 18 at the EPR ridge-axis.&amp;amp;nbsp;Cores were stored upright and refrigerated before return to LDEO where each mono-core was split and analyzed non-destructively.&amp;amp;nbsp;One half core was then archived at LDEO and the other half made available for sampling.&amp;amp;nbsp;In Summer 2015, the sampling halves of each core were transported to WHOI for subsampling of core top material then returned to LDEO.&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;Approximately 5 g (wet-weight) of core top (0-1cm wet) material was extracted from each EPZT half-core with a stainless steel spatula, placed in a glass vial, dried at 60 degrees C overnight and then lightly homogenized with an agate pestle and mortar before being re-weighed.&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;Major elements were determined by fusing 10-20mg of dried sediment with Spectroflux and analyzed followed by ICP-ES analysis following the method of Ingamells (1970).&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;Total carbon and inorganic carbon concentrations was determined using a Perkin Elmer 2400 Elemental Analyzer and a UIC Coulometric Analyzer with Carbonate Module (Honjo et al., 1995). Organic carbon concentrations were calculated by difference between the total carbon and inorganic carbon concentrations.&amp;lt;/p&amp;gt;</gco:CharacterString>
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                            <gco:CharacterString>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 &quot;Projects&quot; below for information about and data resulting from individual US GEOTRACES research projects.</gco:CharacterString>
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                            <gco:CharacterString>&lt;p&gt;&lt;strong&gt;From the NSF Award Abstract&lt;/strong&gt;&lt;br /&gt;
The mission of the International GEOTRACES Program (&lt;a href=&quot;https://www.geotraces.org/&quot; target=&quot;_blank&quot;&gt;https://www.geotraces.org/&lt;/a&gt;), of which the U.S. chemical oceanography research community is a founding member, is &quot;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&quot; (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.&lt;/p&gt;
&lt;p&gt;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.&lt;/p&gt;
&lt;p&gt;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.&lt;/p&gt;
&lt;p&gt;&lt;em&gt;Figure 1. The 2013 GEOTRACES EPZT Cruise Track. [click on the image to view a larger version]&lt;/em&gt;&lt;br /&gt;
&lt;a href=&quot;http://dmoserv3.whoi.edu/data_docs/GEOTRACES/EPZT/GEOTRACES_EPZT_TN303_CruiseTrack.png&quot; target=&quot;_blank&quot;&gt;&lt;img alt=&quot;&quot; src=&quot;https://datadocs.bco-dmo.org/d3/data_docs/GEOTRACES/EPZT/GEOTRACES_EPZT_TN303_CruiseTrack.png&quot; /&gt;&lt;/a&gt;&lt;/p&gt;</gco:CharacterString>
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&lt;p&gt;As regards broader impacts, the scientist from Rutgers University is collaborating with the Education Director of the Centers for Ocean Science Education Excellence Networked Ocean World (COSEE-NOW) to contribute to the MARE (Marine Activities, Resources, and Education) program by inviting teachers and high school students to workshops and presentations on climate and ocean sciences. With the help of COSEE-NOW, he also plans to create educational video clips during the Pacific cruise and the subsequent laboratory based analytical work to educate them on the use of geochemistry to understand how the ocean works. Both scientists also plan to develop a teaching module entitled &quot;Particles, Metals, and Carbon&quot; for an Introduction to Oceanography class taught by the Rutgers scientist. One postdoc from Rutgers University would be supported and trained as part of this project.&lt;/p&gt;</gco:CharacterString>
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http://lod.bco-dmo.org/id/dataset-parameter/687026.rdf
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	Units: unitless
	Description: &lt;p&gt;Core identification number and depth range&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/687027.rdf
	Name: STNNBR
	Units: unitless
	Description: &lt;p&gt;Station number; joined from BCO-DMO EPZT master event file.&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/687028.rdf
	Name: CASTNO
	Units: unitless
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http://lod.bco-dmo.org/id/dataset-parameter/687029.rdf
	Name: SAMPNO
	Units: unitless
	Description: &lt;p&gt;Sequential sample number within the cast (usually corresponds to bottle number).&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/687030.rdf
	Name: Al_DRY_MONOCORE
	Units: weight %
	Description: &lt;p&gt;Aluminum concentration (dry)&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/687031.rdf
	Name: Ba_DRY_MONOCORE
	Units: weight %
	Description: &lt;p&gt;Barium concentration (dry)&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/687032.rdf
	Name: Ca_DRY_MONOCORE
	Units: weight %
	Description: &lt;p&gt;Calcium concentration (dry)&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/687033.rdf
	Name: Fe_DRY_MONOCORE
	Units: weight %
	Description: &lt;p&gt;Iron concentration (dry)&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/687034.rdf
	Name: Mg_DRY_MONOCORE
	Units: weight %
	Description: &lt;p&gt;Magnesium concentration (dry)&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/687035.rdf
	Name: Mn_DRY_MONOCORE
	Units: weight %
	Description: &lt;p&gt;Manganese concentration (dry)&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/687036.rdf
	Name: Si_DRY_MONOCORE
	Units: weight %
	Description: &lt;p&gt;Silicon concentration (dry)&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/687037.rdf
	Name: Sr_DRY_MONOCORE
	Units: weight %
	Description: &lt;p&gt;Strontium concentration (dry)&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/687038.rdf
	Name: Ti_DRY_MONOCORE
	Units: weight %
	Description: &lt;p&gt;Titanium concentration (dry)&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/687039.rdf
	Name: C_TOT_DRY_MONOCORE
	Units: weight %
	Description: &lt;p&gt;Total Carbon concentration (dry)&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/687040.rdf
	Name: C_INORG_DRY_MONOCORE
	Units: weight %
	Description: &lt;p&gt;Inorganic Carbon concentration (dry)&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/687041.rdf
	Name: CaCo3_DRY_MONOCORE
	Units: weight %
	Description: &lt;p&gt;Calcium Carbonate concentration (dry)&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/687042.rdf
	Name: C_ORG_MONOCORE
	Units: weight %
	Description: &lt;p&gt;Organic Carbon concentration (dry)&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/687043.rdf
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http://lod.bco-dmo.org/id/dataset-parameter/687044.rdf
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http://lod.bco-dmo.org/id/dataset-parameter/687045.rdf
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http://lod.bco-dmo.org/id/dataset-parameter/687046.rdf
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http://lod.bco-dmo.org/id/dataset-parameter/687047.rdf
	Name: TIME_END
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http://lod.bco-dmo.org/id/dataset-parameter/687048.rdf
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http://lod.bco-dmo.org/id/dataset-parameter/687049.rdf
	Name: LATITUDE
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http://lod.bco-dmo.org/id/dataset-parameter/687050.rdf
	Name: LONGITUDE
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	Description: &lt;p&gt;Longitude&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/687051.rdf
	Name: depth
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http://lod.bco-dmo.org/id/dataset-parameter/687052.rdf
	Name: COMMENT
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http://lod.bco-dmo.org/id/dataset-parameter/687054.rdf
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&amp;lt;p&amp;gt;Approximately 5 g (wet-weight) of core top (0-1cm wet) material was extracted from each EPZT half-core with a stainless steel spatula, placed in a glass vial, dried at 60 degrees C overnight and then lightly homogenized with an agate pestle and mortar before being re-weighed.&amp;lt;/p&amp;gt;

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                <gco:CharacterString>&amp;lt;p&amp;gt;&amp;lt;strong&amp;gt;Intercalibration:&amp;lt;/strong&amp;gt;&amp;amp;nbsp;International Standard Used for Intercalibration: MAG 1. See the&amp;amp;nbsp;&amp;lt;a href=&amp;quot;http://dmoserv3.whoi.edu/data_docs/GEOTRACES/EPZT/german/MAG_1_Ref_Std.pdf&amp;quot;&amp;gt;detailed analyses for accuracy and precision document&amp;lt;/a&amp;gt; (PDF).&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;&amp;lt;strong&amp;gt;BCO-DMO Processing:&amp;lt;/strong&amp;gt;&amp;lt;br /&amp;gt;
- modified parameter names to conform with BCO-DMO and GEOTRACES naming conventions;&amp;lt;br /&amp;gt;
- copied columns from metadata sheet (lat/lon, dates, times, etc.) to data sheet.&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;&amp;lt;strong&amp;gt;Additional GEOTRACES Processing:&amp;lt;/strong&amp;gt;&amp;lt;br /&amp;gt;
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:&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;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, &amp;amp;nbsp;BTL_DATE, BTL_TIME, BTL_ISO_DATETIME_UTC, BTL_LAT, BTL_LON, ODF_CTDPRS, SMDEPTH, FMDEPTH, BTMDEPTH, CTDPRS, CTDDEPTH.&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;This added information will facilitate subsequent analysis and inter comparison of the datasets.&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;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.&amp;lt;/p&amp;gt;

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