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            <gmx:Anchor xlink:href="https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/insttype/details/210" xlink:actuate="onRequest">Niskin bottle</gmx:Anchor>
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                <gco:CharacterString>NCEI Accession 0176592 was revised and v4.4 was published.</gco:CharacterString>
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                <gco:DateTime>2020-10-16T20:33:50Z</gco:DateTime>
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                        <gco:CharacterString>NCEI Accession 0176592 v4.4</gco:CharacterString>
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                                    <gmd:URL>https://www.ncei.noaa.gov/archive/accession/0176592/4.4</gmd:URL>
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                                    <gco:CharacterString>NCEI Accession 0176592 v4.4</gco:CharacterString>
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                                    <gco:CharacterString>published 2020-10-16T20:33:50Z</gco:CharacterString>
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                <gco:CharacterString>NCEI Accession 0176592 was revised and v5.5 was published.</gco:CharacterString>
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                <gco:DateTime>2021-02-27T00:57:59Z</gco:DateTime>
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                        <gco:CharacterString>NCEI Accession 0176592 v5.5</gco:CharacterString>
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                                    <gmd:URL>https://www.ncei.noaa.gov/archive/accession/0176592/5.5</gmd:URL>
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                                    <gco:CharacterString>NCEI Accession 0176592 v5.5</gco:CharacterString>
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        </gmd:LI_Lineage>
      </gmd:lineage>
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  </gmd:dataQualityInfo>
  <gmd:dataQualityInfo>
    <gmd:DQ_DataQuality>
      <gmd:scope>
        <gmd:DQ_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: Dissolved Inorganic Carbon;
Abbreviation: TCARBN;
Unit: UMOL/KG;
Observation type: Discrete, bottle;
Measured or calculated: Measured;
Sampling instrument: Niskin Bottles;
Analyzing instrument: SOMMA;
Quality flag convention: WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value;
Researcher name: Bronte Tilbrook;
Researcher institution: CSIRO</gco:CharacterString>
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          </gmd:processStep>
          <gmd:processStep>
            <gmi:LE_ProcessStep>
              <gmd:description>
                <gco:CharacterString>Parameter or Variable: Total Alkalinity;
Abbreviation: ALKALI;
Unit: UMOL/KG;
Observation type: Discrete, bottle;
Sampling instrument: Niskin Bottle;
Analyzing instrument: Alkalinity titrator;
Quality flag convention: WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value;
Researcher name: Bronte Tilbrook;
Researcher institution: CSIRO</gco:CharacterString>
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          <gmd:processStep>
            <gmi:LE_ProcessStep>
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                <gco:CharacterString>Parameter or Variable: pH on Total Scale;
Abbreviation: PH_TOT;
Observation type: Discrete, bottle;
Sampling instrument: Niskin Bottle;
Quality flag convention: WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value;
Researcher name: Andrew Dickson;
Researcher institution: SIO</gco:CharacterString>
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          <gmd:processStep>
            <gmi:LE_ProcessStep>
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                <gco:CharacterString>Parameter or Variable: CTD Temperature;
Abbreviation: CTDTMP;
Unit: degrees celcius;
Observation type: CTD sensor;
Sampling instrument: CTD;
Analyzing instrument: CTD;
Quality flag convention: WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value;
Researcher name: Stephen Rintoul;
Researcher institution: CSIRO</gco:CharacterString>
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            </gmi:LE_ProcessStep>
          </gmd:processStep>
          <gmd:processStep>
            <gmi:LE_ProcessStep>
              <gmd:description>
                <gco:CharacterString>Parameter or Variable: CTD Salinity;
Abbreviation: CTDSAL;
Observation type: CTD sensor;
Sampling instrument: CTD;
Analyzing instrument: CTD;
Quality flag convention: WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value;
Researcher name: Stephen Rintoul;
Researcher institution: CSIRO</gco:CharacterString>
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          <gmd:processStep>
            <gmi:LE_ProcessStep>
              <gmd:description>
                <gco:CharacterString>Parameter or Variable: CTD Oxygen;
Abbreviation: CTDOXY;
Observation type: CTD sensor;
Sampling instrument: CTD;
Analyzing instrument: CTD;
Quality flag convention: WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value;
Researcher name: Stephen Rintoul;
Researcher institution: CSIRO</gco:CharacterString>
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          </gmd:processStep>
          <gmd:processStep>
            <gmi:LE_ProcessStep>
              <gmd:description>
                <gco:CharacterString>Parameter or Variable: Oxygen;
Abbreviation: OXYGEN;
Unit: UMOL/KG;
Observation type: Bottle, discrete;
Sampling instrument: Niskin bottles;
Quality flag convention: WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value;
Researcher name: Stephen Rintoul;
Researcher institution: CSIRO</gco:CharacterString>
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          <gmd:processStep>
            <gmi:LE_ProcessStep>
              <gmd:description>
                <gco:CharacterString>Parameter or Variable: Salinity;
Abbreviation: SALNTY;
Observation type: Bottle, discrete;
Sampling instrument: Niskin bottles;
Quality flag convention: WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value;
Researcher name: Stephen Rintoul;
Researcher institution: CSIRO</gco:CharacterString>
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            </gmi:LE_ProcessStep>
          </gmd:processStep>
          <gmd:processStep>
            <gmi:LE_ProcessStep>
              <gmd:description>
                <gco:CharacterString>Parameter or Variable: Nutrients;
Abbreviation: SILCAT, NITRAT, NITRIT, PHSPHT;
Unit: UMOL/KG;
Observation type: Bottle, discrete;
Sampling instrument: Niskin bottles;
Quality flag convention: WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value;
Researcher name: Mark Rosenberg;
Researcher institution: CSIRO</gco:CharacterString>
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          </gmd:processStep>
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            <gmi:LE_ProcessStep>
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                <gco:CharacterString>Parameter or Variable: Chlorofluorocarbons;
Abbreviation: CFCs;
Unit: PMOL/KG;
Observation type: Bottle, discrete;
Sampling instrument: Niskin bottles;
Quality flag convention: WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value;
Researcher name: Mark Warner;
Researcher institution: University of Washington</gco:CharacterString>
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          <gmd:processStep>
            <gmi:LE_ProcessStep>
              <gmd:description>
                <gco:CharacterString>Parameter or Variable: C14/C13;
Abbreviation: C14/C13;
Unit: /persent;
Observation type: Bottle, discrete;
Sampling instrument: Niskin bottles;
Quality flag convention: WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value;
Researcher name: Robert Key, Ann McNichol;
Researcher institution: Princeton University, WHOI</gco:CharacterString>
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  </gmd:dataQualityInfo>
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        <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>
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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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          <gmd:organisationName>
            <gco:CharacterString>NOAA National Centers for Environmental Information</gco:CharacterString>
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  <gmi:acquisitionInformation>
    <gmi:MI_AcquisitionInformation id="AMS">
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        <gmi:MI_Instrument id="inst_be58">
          <gmi:identifier>
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              <gmd:code>
                <gco:CharacterString>carbon dioxide (CO2) gas analyzer</gco:CharacterString>
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            </gmd:MD_Identifier>
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          <gmi:type>
            <gco:CharacterString>carbon dioxide (CO2) gas analyzer</gco:CharacterString>
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          <gmi:description>
            <gco:CharacterString>measures gaseous carbon dioxide

Carbon dioxide gas analyzer has often been referred to as LI-COR, because a lot of researchers choose to use products manufactured by LI-COR incorporation for their carbon dioxide measurement. The main component of a carbon dioxide analyzer is a nondispersive infrared (NDIR) spectroscopic sensors to detect CO2 in a gaseous environment by its characteristic absorption.

Carbon dioxide (CO2) gas analyzer works together with carbon dioxide (CO2) equilibrator (insttypes_id 184) to measure carbon dioxide in the water.

To measure water carbon dioxide, water needs to be continuously supplied to a showerhead inside an equilibrator. As the water flows through the equilibrator chamber, dissolved carbon dioxide exchanges quickly with air in the headspace. This air is then sampled by the carbon dioxide analyzer to determine the mole fraction of CO2 in water.</gco:CharacterString>
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      </gmi:instrument>
      <gmi:instrument>
        <gmi:MI_Instrument id="inst_bee7">
          <gmi:identifier>
            <gmd:MD_Identifier>
              <gmd:code>
                <gco:CharacterString>CTD</gco:CharacterString>
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            </gmd:MD_Identifier>
          </gmi:identifier>
          <gmi:type>
            <gco:CharacterString>CTD</gco:CharacterString>
          </gmi:type>
          <gmi:description>
            <gco:CharacterString>Conductivity-Temperature-Depth probe</gco:CharacterString>
          </gmi:description>
        </gmi:MI_Instrument>
      </gmi:instrument>
      <gmi:instrument>
        <gmi:MI_Instrument id="inst_be3d">
          <gmi:identifier>
            <gmd:MD_Identifier>
              <gmd:code>
                <gco:CharacterString>Niskin bottle</gco:CharacterString>
              </gmd:code>
            </gmd:MD_Identifier>
          </gmi:identifier>
          <gmi:type>
            <gco:CharacterString>Niskin bottle</gco:CharacterString>
          </gmi:type>
          <gmi:description>
            <gco:CharacterString>Device for obtaining samples of seawater at a specific depth

Why special entry for Niskin bottle but no entry for Nansen bottle?</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>
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          </gmi:identifier>
          <gmi:type>
            <gco:CharacterString>titrator</gco:CharacterString>
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          <gmi:description>
            <gco:CharacterString>titrator</gco:CharacterString>
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      <gmi:platform>
        <gmi:MI_Platform id="plat_8e14">
          <gmi:identifier>
            <gmd:MD_Identifier>
              <gmd:code>
                <gco:CharacterString>RV Investigator</gco:CharacterString>
              </gmd:code>
            </gmd:MD_Identifier>
          </gmi:identifier>
          <gmi:description>
            <gco:CharacterString>ICES request for the vessel Investigator from AUSTRALIA(AU).

Name : Investigator
Country(s) : AUSTRALIA(AU) (ISO Country Code)
Platform Class : 31 Research vessel
Call Sign : VLMJ
MMSI: 503791000
IMO : 9616888
Pennant : Australia
Title : RV
Commissioned Date : 2014-09-09
Current Length : 94
Built : 2014-08

Information Sources:
- http://mnf.csiro.au/Vessel/Investigator-2014/Specifications.aspx

Confirmed by NOAA on 2015-07-14.</gco:CharacterString>
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          <gmi:instrument gco:nilReason="missing" />
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