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          <gmd:keyword>
            <gmx:Anchor xlink:href="https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/datatype/details/307" xlink:actuate="onRequest">SALINITY</gmx:Anchor>
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          <gmd:keyword>
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                <gco:CharacterString>NODC PLATFORM NAMES THESAURUS</gco:CharacterString>
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                <gco:CharacterString>NODC COLLECTING INSTITUTION NAMES THESAURUS</gco:CharacterString>
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            <gmx:Anchor xlink:href="https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/project/details/727" xlink:actuate="onRequest">Ocean Carbon and Acidification Data System (OCADS)</gmx:Anchor>
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            <gmx:Anchor xlink:href="https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/project/details/719" xlink:actuate="onRequest">The Global Ocean Ship-based Hydrographic Investigations Program (GO-SHIP)</gmx:Anchor>
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            <gmd:MD_KeywordTypeCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#MD_KeywordTypeCode" codeListValue="project">project</gmd:MD_KeywordTypeCode>
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          <gmd:keyword>
            <gmx:Anchor xlink:href="https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/seaname/details/105" xlink:actuate="onRequest">South Atlantic Ocean</gmx:Anchor>
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            <gmd:MD_KeywordTypeCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#MD_KeywordTypeCode" codeListValue="place">place</gmd:MD_KeywordTypeCode>
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              <gmd:title>
                <gco:CharacterString>NODC SEA AREA NAMES THESAURUS</gco:CharacterString>
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                                  <gmd:linkage>
                                    <gmd:URL>https://www.ncei.noaa.gov/archive/accession/0162231/1.1</gmd:URL>
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                                    <gco:CharacterString>HTTPS</gco:CharacterString>
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                                    <gco:CharacterString>NCEI Accession 0162231 v1.1</gco:CharacterString>
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                                    <gco:CharacterString>published 2017-05-02T12:31:07Z</gco:CharacterString>
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      <gmd:scope>
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            <gmd:MD_ScopeCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#MD_ScopeCode" codeListValue="dataset">dataset</gmd:MD_ScopeCode>
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              <gmd:description>
                <gco:CharacterString>Parameter or Variable: pH;
Abbreviation: pH_EXT_TOT_AT_SST;
pH scale: Total;
Observation type: Surface Underway;
Measured or calculated: Measured;
Sampling instrument: Ship Underway system;
Analyzing instrument: Honeywell Durafet III pH electrode and Orion Chloride Ion Selective Electrode;
Temperature of pH measurement: in-situ;
Detailed sampling and analyzing information: Please refer to the separately uploaded methods description file A13_5_underway_pH_2010_methods.pdf.;
Temperature correction method: CO2SYS, using pH and TA (estimated from sea surface temperautre and salinity) as inputs, and equilibrium constants from [Mehrbach et al. 1973] refit by [Dickson and Millero, 1987];
At what temperature was pH reported: at SST;
Uncertainty: Accuracy: 0.007; Short term precision (hours): 0.0005; Long term precision (weeks): 0.004;
Method reference: Martz, T. R., J. G. Connery, and K. S. Johnson (2010), Testing the Honeywell Durafet for seawater pH applications, Limnol. Oceanogr. Methods, 8, 172-184, https://doi.org/10.4319/lom.2010.8.172.;
Researcher name: Yuichiro Takeshita;
Researcher institution: Monterey Bay Aquarium Research Institute</gco:CharacterString>
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              <gmd:description>
                <gco:CharacterString>Parameter or Variable: Sea Surface Temperature;
Abbreviation: SEA_SURFACE_TEMPERATURE_C;
Unit: Deg_C;
Observation type: Surface underway;
Sampling instrument: Ship's Underway system;
Analyzing instrument: SBE58;
Detailed sampling and analyzing information: The SST temperature measurements are from the Seabird 21 TSG, which is immersed in the instrument chest of the ship in the bow thruster space. SST data were interpolated from the underway fCO2 dataset to the timestamp of the pH sensor;
Uncertainty: Factory calibraiton better than 0.01 C; not verified on cruise;
Researcher name: Rik Wanninkhof;
Researcher institution: NOAA/AOML</gco:CharacterString>
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            <gmi:LE_ProcessStep>
              <gmd:description>
                <gco:CharacterString>Parameter or Variable: Sea Surface Salinity;
Abbreviation: SALINITY_PSS_78;
Unit: PSS78;
Observation type: Surface underway;
Sampling instrument: Ship's Underway system;
Analyzing instrument: SBE45;
Detailed sampling and analyzing information: The salinity measurements are from the Seabird 45 Micro TSG in the underway fCO2 system. Salinity data were interpolated from the underway fCO2 dataset to the timestamp of the pH sensor;
Uncertainty: Better than 0.1, based on comparisons to surface bottle salinity measurements (n = 129);
Researcher name: Rik Wanninkhof;
Researcher institution: NOAA/AOML</gco:CharacterString>
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        <gco:CharacterString>Metadata are developed, maintained and distributed by NCEI. Updates are performed as needed to maintain currentness.</gco:CharacterString>
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            <gco:CharacterString>NOAA National Centers for Environmental Information</gco:CharacterString>
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  <gmi:acquisitionInformation>
    <gmi:MI_AcquisitionInformation id="AMS">
      <gmi:instrument>
        <gmi:MI_Instrument id="inst_bedd">
          <gmi:identifier>
            <gmd:MD_Identifier>
              <gmd:code>
                <gco:CharacterString>pH sensor</gco:CharacterString>
              </gmd:code>
            </gmd:MD_Identifier>
          </gmi:identifier>
          <gmi:type>
            <gco:CharacterString>pH sensor</gco:CharacterString>
          </gmi:type>
          <gmi:description>
            <gco:CharacterString>generic meter used to measure pH

Any of a class of instruments used to quantify pH in a water or other type of sample.</gco:CharacterString>
          </gmi:description>
        </gmi:MI_Instrument>
      </gmi:instrument>
      <gmi:platform>
        <gmi:MI_Platform id="plat_9c5b">
          <gmi:identifier>
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              <gmd:code>
                <gco:CharacterString>NOAA Ship Ronald H. Brown</gco:CharacterString>
              </gmd:code>
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          <gmi:description>
            <gco:CharacterString>Updated information from ICES for UNITED STATES platform

Ronald H. Brown
Flag : UNITED STATES - US (ISO Country Code)
Call Sign : WTEC
Title : NOAA Ship
Platform Class : Research vessel
IMO : 9105786
Pennant : R 104
Commissioned Date : 1997-07-19
Current Length : 83.5
Built : 1997
Information Source : http://www.moc.noaa.gov/rb/index.html (URL)
Lloyds URL : http://www.seasearcher.com/lmiu/vessels/overview.htm?vesselID=277516

*General Comments:*
Name RESEARCHER II planned during build was never used.</gco:CharacterString>
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