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                <gco:CharacterString>Parameter or Variable: Total alkalinity;
Abbreviation: TA;
Unit: micromoles per kilogram;
Observation type: surface underway;
Measured or calculated: measured;
Sampling instrument: CONTROS HydroFIAÂ® TA;
Analyzing instrument: CONTROS HydroFIAÂ® TA;
Type of titration: single acid addition;
Cell type (open or closed): closed (with CO2 removal via chemical absorption);
Detailed sampling and analyzing information: An inline filter (0.2 Âµm) with small 50 mL overflow reservoir for filtered seawater was supplied with the ship's underway seawater supply. The HydroFIA TA then drew the sample from the reservoir into the instrument for analysis. The HydroFIA TA instrument performed a single-point titration of seawater with 0.1N hydrochloric acid (HCl), using bromocresol green (BCG) as the indicator for spectrophotometric pH detection.;
Replicate information: 2.0 Âµmol/kg, calculated as one standard deviation of triplicate measurements of certified reference material;
Standardization description: The instrument was calibrated using certified reference material (CRM) obtained from Dr. Andrew Dickson at Scripps Institution of Oceanography. The instrument was calibrated before each cruise, and periodic CRM measurements were made during each cruise. These CRM measurements were used to correct the underway sample data. For more details, see Hunt et al. (2020, in review). CRM Batch 163 was used during these cruises.;
CRM manufacturer: Dr. Andrew Dickson, Scripps Institute of Oceanography;
Preservation method: none;
Preservative volume: none;
Preservative correction: none;
Uncertainty: 2.3Â±13;
Method reference: AÃmann, S., Frank, C., Petersen, W., KÃ¶rtzinger, A., 2013. 2013. Autonomous pH and alkalinity sensors for the characterization of the carbonate system in coastal areas. Presented at the EGU General Assembly Conference Abstracts, pp. EGU2013-8760. Seelmann, K., AÃmann, S., KÃ¶rtzinger, A., 2019. Characterization of a novel autonomous analyzer for seawater total alkalinity: Results from laboratory and field tests. Limnology and Oceanography: Methods 17, 515-532. https://doi.org/10.1002/lom3.10329;
Researcher name: Christopher W. Hunt;
Researcher institution: Ocean Process Analysis Laboratory, University of New Hampshire</gco:CharacterString>
              </gmd:description>
            </gmi:LE_ProcessStep>
          </gmd:processStep>
          <gmd:processStep>
            <gmi:LE_ProcessStep>
              <gmd:description>
                <gco:CharacterString>Parameter or Variable: salinity;
Abbreviation: sss;
Unit: psu;
Observation type: surface underway;
Analyzing instrument: SBE-45;
Detailed sampling and analyzing information: Salinity was measured from a continuous surface seawater supply (intake depth about 3 m) using a Seabird SBE-45 thermosalinograph (Sea-bird Electronics, Bellevue WA). The NOAA Oceanic and Atmospheric Research (OAR) office is acknowledged for financial support for underway TSG operations on the Bigelow, in particular the Global Ocean Monitoring and Observation Program (GOMO); fund reference no. 100007298) and the NOAA/OAR Ocean Acidification Program.;
Uncertainty: accuracy 0.0003 S/m with a precision of 0.00001 S/m;
Researcher name: Rik Wanninkhof;
Researcher institution: NOAA AOML</gco:CharacterString>
              </gmd:description>
            </gmi:LE_ProcessStep>
          </gmd:processStep>
          <gmd:processStep>
            <gmi:LE_ProcessStep>
              <gmd:description>
                <gco:CharacterString>Parameter or Variable: seawater temperature;
Abbreviation: sst;
Unit: degrees Celcius;
Observation type: surface underway;
Analyzing instrument: SBE-45;
Detailed sampling and analyzing information: Seawater temperature was measured from a continuous surface seawater supply (intake depth about 3 m) using a Seabird SBE-45 thermosalinograph (Sea-bird Electronics, Bellevue WA). The NOAA Oceanic and Atmospheric Research (OAR) office is acknowledged for financial support for underway TSG operations on the Bigelow, in particular the Global Ocean Monitoring and Observation Program (GOMO); fund reference no. 100007298) and the NOAA/OAR Ocean Acidification Program.;
Uncertainty: accuracy 0.002 with a percision of 0.0001;
Researcher name: Rik Wanninkhof;
Researcher institution: NOAA AOML</gco:CharacterString>
              </gmd:description>
            </gmi:LE_ProcessStep>
          </gmd:processStep>
        </gmd:LI_Lineage>
      </gmd:lineage>
    </gmd:DQ_DataQuality>
  </gmd:dataQualityInfo>
  <gmd:metadataMaintenance>
    <gmd:MD_MaintenanceInformation>
      <gmd:maintenanceAndUpdateFrequency>
        <gmd:MD_MaintenanceFrequencyCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#MD_MaintenanceFrequencyCode" codeListValue="asNeeded">asNeeded</gmd:MD_MaintenanceFrequencyCode>
      </gmd:maintenanceAndUpdateFrequency>
      <gmd:maintenanceNote>
        <gco:CharacterString>Metadata are developed, maintained and distributed by NCEI. Updates are performed as needed to maintain currentness.</gco:CharacterString>
      </gmd:maintenanceNote>
      <gmd:contact>
        <gmd:CI_ResponsibleParty>
          <gmd:organisationName>
            <gco:CharacterString>NOAA National Centers for Environmental Information</gco:CharacterString>
          </gmd:organisationName>
          <gmd:role>
            <gmd:CI_RoleCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#CI_RoleCode" codeListValue="custodian">custodian</gmd:CI_RoleCode>
          </gmd:role>
        </gmd:CI_ResponsibleParty>
      </gmd:contact>
    </gmd:MD_MaintenanceInformation>
  </gmd:metadataMaintenance>
  <gmi:acquisitionInformation>
    <gmi:MI_AcquisitionInformation id="AMS">
      <gmi:instrument>
        <gmi:MI_Instrument id="inst_bec8">
          <gmi:identifier>
            <gmd:MD_Identifier>
              <gmd:code>
                <gco:CharacterString>surface seawater intake</gco:CharacterString>
              </gmd:code>
            </gmd:MD_Identifier>
          </gmi:identifier>
          <gmi:type>
            <gco:CharacterString>surface seawater intake</gco:CharacterString>
          </gmi:type>
          <gmi:description>
            <gco:CharacterString>not an instrument or observation type</gco:CharacterString>
          </gmi:description>
        </gmi:MI_Instrument>
      </gmi:instrument>
      <gmi:instrument>
        <gmi:MI_Instrument id="inst_be28">
          <gmi:identifier>
            <gmd:MD_Identifier>
              <gmd:code>
                <gco:CharacterString>titrator</gco:CharacterString>
              </gmd:code>
            </gmd:MD_Identifier>
          </gmi:identifier>
          <gmi:type>
            <gco:CharacterString>titrator</gco:CharacterString>
          </gmi:type>
          <gmi:description>
            <gco:CharacterString>titrator</gco:CharacterString>
          </gmi:description>
        </gmi:MI_Instrument>
      </gmi:instrument>
      <gmi:platform>
        <gmi:MI_Platform id="plat_9441">
          <gmi:identifier>
            <gmd:MD_Identifier>
              <gmd:code>
                <gco:CharacterString>NOAA Ship Henry B. Bigelow</gco:CharacterString>
              </gmd:code>
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          <gmi:description>
            <gco:CharacterString>Title: NOAA Ship
Flag: United States of America
Vessel Type: Fishery Research Vessel (Oceanographic)
DOB: Jun 2006
IMO: 9349057

NOAA Ship HENRY B. BIGELOW was launched on July 8, 2005 and commissioned by NOAA on July 16, 2007.  For more information, see http://www.moc.noaa.gov/hb.

Submitted by NODC to ICES on 2010-09-08.
Confirmed in ICES by NOAA on 2012-10-02.</gco:CharacterString>
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          <gmi:instrument gco:nilReason="missing" />
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  </gmi:acquisitionInformation>
</gmi:MI_Metadata>