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These data were collected by Rik Wanninkhof of NOAA Atlantic Oceanographic and Meteorological Laboratory (AOML), Richard A. Feely of NOAA Pacific Marine Environmental Laboratory (PMEL), Andrew G. Dickson of Scripps Institution of Oceanography (SIO), and Dennis A. Hansell of Rosenstiel School of Marine and Atmospheric Science (RSMAS) as part of the CLIVAR_A13.5_2010 dataset. CDIAC associated the following cruise ID(s) with this dataset: CLIVAR_A13.5_2010 and RB_07-05

The International CLIVAR Global Ocean Carbon and Repeat Hydrography Program carries out a systematic and global re-occupation of select WOCE/JGOFS hydrographic sections to quantify changes in storage and transport of heat, fresh water, carbon dioxide (CO2), and related parameters.</gco:CharacterString>
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          <gmd:keyword>
            <gmx:Anchor xlink:href="https://cmr.earthdata.nasa.gov/kms/concept/4fde380a-38c5-4d46-bc80-4f2515a43983" xlink:actuate="onRequest">EARTH SCIENCE &gt; OCEANS &gt; OCEAN CHEMISTRY &gt; NITRATE</gmx:Anchor>
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                            <gmd:CI_DateTypeCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#CI_DateTypeCode" codeListValue="publication">publication</gmd:CI_DateTypeCode>
                          </gmd:dateType>
                        </gmd:CI_Date>
                      </gmd:date>
                      <gmd:citedResponsibleParty>
                        <gmd:CI_ResponsibleParty>
                          <gmd:individualName gco:nilReason="inapplicable" />
                          <gmd:contactInfo>
                            <gmd:CI_Contact>
                              <gmd:onlineResource>
                                <gmd:CI_OnlineResource>
                                  <gmd:linkage>
                                    <gmd:URL>https://www.ncei.noaa.gov/archive/accession/0108156/2.2</gmd:URL>
                                  </gmd:linkage>
                                  <gmd:protocol>
                                    <gco:CharacterString>HTTPS</gco:CharacterString>
                                  </gmd:protocol>
                                  <gmd:name>
                                    <gco:CharacterString>NCEI Accession 0108156 v2.2</gco:CharacterString>
                                  </gmd:name>
                                  <gmd:description>
                                    <gco:CharacterString>published 2017-02-21T14:55:17Z</gco:CharacterString>
                                  </gmd:description>
                                  <gmd:function>
                                    <gmd:CI_OnLineFunctionCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#CI_OnLineFunctionCode" codeListValue="download">download</gmd:CI_OnLineFunctionCode>
                                  </gmd:function>
                                </gmd:CI_OnlineResource>
                              </gmd:onlineResource>
                            </gmd:CI_Contact>
                          </gmd:contactInfo>
                          <gmd:role gco:nilReason="inapplicable" />
                        </gmd:CI_ResponsibleParty>
                      </gmd:citedResponsibleParty>
                    </gmd:CI_Citation>
                  </gmd:sourceCitation>
                </gmi:LE_Source>
              </gmi:output>
            </gmi:LE_ProcessStep>
          </gmd:processStep>
        </gmd:LI_Lineage>
      </gmd:lineage>
    </gmd:DQ_DataQuality>
  </gmd:dataQualityInfo>
  <gmd:dataQualityInfo>
    <gmd:DQ_DataQuality>
      <gmd:scope>
        <gmd:DQ_Scope>
          <gmd:level>
            <gmd:MD_ScopeCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#MD_ScopeCode" codeListValue="dataset">dataset</gmd:MD_ScopeCode>
          </gmd:level>
        </gmd:DQ_Scope>
      </gmd:scope>
      <gmd:lineage>
        <gmd:LI_Lineage>
          <gmd:processStep>
            <gmi:LE_ProcessStep>
              <gmd:description>
                <gco:CharacterString>Parameter or Variable: Dissolved Inorganic Carbon;
Abbreviation: DIC;
Observation type: discrete;
In-situ / Manipulation / Response variable: in-situ observation;
Measured or calculated: Calculated;
Replicate information: The precision is displayed by the greater than 300 replicate samples drawn. The absolute average difference from the mean of these replicates is less than 0.75 μmol/kg. No significant systematic differences were noted.;
Standardization description: The coulometers were each calibrated by injecting aliquots of pure CO2 (99.995%) by means of an 8-port valve outfitted with two sample loops. The instruments were calibrated at the beginning, middle, and end of each station with a set of the gas loop injections.;
CRM batch number: Batch 98</gco:CharacterString>
              </gmd:description>
            </gmi:LE_ProcessStep>
          </gmd:processStep>
          <gmd:processStep>
            <gmi:LE_ProcessStep>
              <gmd:description>
                <gco:CharacterString>Parameter or Variable: Total alkalinity;
Abbreviation: TA;
Observation type: discrete;
In-situ / Manipulation / Response variable: in-situ observation;
Measured or calculated: Measured;
Type of titration: Single point titration;
Cell type (open or closed): Open;
Curve fitting method: Total alkalinity measurements were made using an open-cell, two-stage, potentiometric titration procedure similar to that used to certify reference materials for total alkalinity (see Dickson et al., 2003), except that samples were not weighed into the titration vessel but instead 99.9 mL was dispensed from a Dosimat using a 50 mL burette.;
Uncertainty: The at-sea repeatability of the method was estimated by analyzing duplicate samples, collected on each cast. These results were used to estimate a standard deviation using the standard expression (DOE, 1994, SOP 23). The repeatability was 1.38 μmol/kg, based on 237 pairs of analyses. In addition, analyses were made of the alkalinity of CO2 reference material. These analyses were carried out 253 times through out the cruise and at most stations.;
Method reference: Dickson, A.G., Sabine, C.L. and Christian, J.R. (Eds.) 2007. Guide to best practices for ocean CO2 measurements. PICES Special Publication 3, 191 pp.</gco:CharacterString>
              </gmd:description>
            </gmi:LE_ProcessStep>
          </gmd:processStep>
          <gmd:processStep>
            <gmi:LE_ProcessStep>
              <gmd:description>
                <gco:CharacterString>Parameter or Variable: pH;
Abbreviation: pH;
pH scale: total hydrogen ion scale;
Observation type: discrete;
In-situ / Manipulation / Response variable: in-situ observation;
Measured or calculated: Measured;
Temperature of pH measurement: 25C;
Detailed sampling and analyzing information: pH values were measured spectrophotometrically, using the constants of Liu et al. (2011) at a temperature ranging between 17 and 20 deg. C. These values are adjusted to counter errors created by the use of constants determined for purified m-cresol dye for measurements made with unpurified (Acros Organics) dye. The applied adjustment is a pH dependent offset estimated by fitting a 2nd order polynomial to the data in figure 2a in the article by Liu et al. (2011). The likely uncertainties on these measurements are explored in detail in Carter et al. (conditionally accepted, 2013). These values have been further adjusted to the reported values at 25 C using CO2SYS (van Hueven et al., 2009) with the carbonate constants given by Dickson and Millero (1987). For the ~10 samples lacking sufficient carbonate constraints for this calculation, the mean value of the missing data from the samples above and below the sample in the water column were used. This data is estimated to have a precision and accuracy uncertainty of 0.0006 and 0.006 pH units respectively.;
Uncertainty: Precision estimate: +/-0.0006. Accuracy estimate: +/-0.006.</gco:CharacterString>
              </gmd:description>
            </gmi:LE_ProcessStep>
          </gmd:processStep>
          <gmd:processStep>
            <gmi:LE_ProcessStep>
              <gmd:description>
                <gco:CharacterString>Parameter or Variable: pCO2 (fCO2) discrete;
Abbreviation: fCO2;
Observation type: discrete;
In-situ / Manipulation / Response variable: in-situ observation;
Measured or calculated: Measured;
Storage method: NA;
Seawater volume: 500mL;
Headspace volume: 50mL;
Temperature of measurement: 20C;
Detailed sampling and analyzing information: The discrete pCO2 system is patterned after the instrument described in Chipman et al. (1991) and is discussed in detail in Wanninkhof and Thoning (1993) and Chen et al. (1995). The major difference between the two systems is that the Wanninkhof and current instrument uses a LI-COR model 6262 non-dispersive infrared analyzer, while the Chipman instrument utilizes a gas chromatograph with a flame ionization detector.;
Sample replicate information: There were 183 pairs of duplicate samples drawn from Niskins on 101 stations. The average relative difference between all the pairs was 0.250 % (+/- 0.287 %). If the four relative differences above 1% are excluded (~95% confidence interval), the average relative difference was 0.220 % (+/- 0.209 %).;
Temperature correction method: Small adjustments to 20.00 C were performed using the temperature coefficients of the carbonate dissociation constants.;
Uncertainty: NA;
Method reference: Chipman, D. W., T. Takahashi, D. Breger, and S.C. Sutherland (1991), Investigation of carbon dioxide in the South Atlantic and Northern Weddell areas (WOCE section A-12 and A-21) during the METEOR expedition 11/5 Jan.-March 1990, LDGO of Columbia University, Palisades. Wanninkhof, R., and K. Thoning (1993), Measurement of fugacity of CO2 in surface water using continuous and discrete sampling methods, Mar. Chem., 44, 189-205. Chen, H., R. Wanninkhof, R. A. Feely, and D. Greeley (1995), Measurement of fugacity of carbon dioxide in sub-surface water: an evaluation of a method based on infrared analysis, NOAA technical report ERL AOML-85, 52 pp, NOAA/AOML.</gco:CharacterString>
              </gmd:description>
            </gmi:LE_ProcessStep>
          </gmd:processStep>
          <gmd:processStep>
            <gmi:LE_ProcessStep>
              <gmd:description>
                <gco:CharacterString>Parameter or Variable: CTDTMP;
Abbreviation: CTDTMP;
Unit: DEG_C;
Controlled vocabulary name: WATER TEMPERATURE;
In-situ / Manipulation / Response variable: in-situ observation</gco:CharacterString>
              </gmd:description>
            </gmi:LE_ProcessStep>
          </gmd:processStep>
          <gmd:processStep>
            <gmi:LE_ProcessStep>
              <gmd:description>
                <gco:CharacterString>Parameter or Variable: CTDSAL;
Abbreviation: CTDSAL;
Controlled vocabulary name: SALINITY;
In-situ / Manipulation / Response variable: in-situ observation</gco:CharacterString>
              </gmd:description>
            </gmi:LE_ProcessStep>
          </gmd:processStep>
          <gmd:processStep>
            <gmi:LE_ProcessStep>
              <gmd:description>
                <gco:CharacterString>Parameter or Variable: SALNTY;
Abbreviation: SALNTY;
Controlled vocabulary name: SALINITY;
In-situ / Manipulation / Response variable: in-situ observation</gco:CharacterString>
              </gmd:description>
            </gmi:LE_ProcessStep>
          </gmd:processStep>
          <gmd:processStep>
            <gmi:LE_ProcessStep>
              <gmd:description>
                <gco:CharacterString>Parameter or Variable: CTDOXY;
Abbreviation: CTDOXY;
Unit: UMOL/KG;
Controlled vocabulary name: DISSOLVED OXYGEN;
In-situ / Manipulation / Response variable: in-situ observation</gco:CharacterString>
              </gmd:description>
            </gmi:LE_ProcessStep>
          </gmd:processStep>
          <gmd:processStep>
            <gmi:LE_ProcessStep>
              <gmd:description>
                <gco:CharacterString>Parameter or Variable: OXYGEN;
Abbreviation: OXYGEN;
Unit: UMOL/KG;
Controlled vocabulary name: DISSOLVED OXYGEN;
In-situ / Manipulation / Response variable: in-situ observation</gco:CharacterString>
              </gmd:description>
            </gmi:LE_ProcessStep>
          </gmd:processStep>
          <gmd:processStep>
            <gmi:LE_ProcessStep>
              <gmd:description>
                <gco:CharacterString>Parameter or Variable: SILCAT;
Abbreviation: SILCAT;
Unit: UMOL/KG;
Controlled vocabulary name: silicate;
In-situ / Manipulation / Response variable: in-situ observation</gco:CharacterString>
              </gmd:description>
            </gmi:LE_ProcessStep>
          </gmd:processStep>
          <gmd:processStep>
            <gmi:LE_ProcessStep>
              <gmd:description>
                <gco:CharacterString>Parameter or Variable: NITRAT;
Abbreviation: NITRAT;
Unit: UMOL/KG;
Controlled vocabulary name: NITRATE;
In-situ / Manipulation / Response variable: in-situ observation</gco:CharacterString>
              </gmd:description>
            </gmi:LE_ProcessStep>
          </gmd:processStep>
          <gmd:processStep>
            <gmi:LE_ProcessStep>
              <gmd:description>
                <gco:CharacterString>Parameter or Variable: NITRIT;
Abbreviation: NITRIT;
Unit: UMOL/KG;
Controlled vocabulary name: NITRITE;
In-situ / Manipulation / Response variable: in-situ observation</gco:CharacterString>
              </gmd:description>
            </gmi:LE_ProcessStep>
          </gmd:processStep>
          <gmd:processStep>
            <gmi:LE_ProcessStep>
              <gmd:description>
                <gco:CharacterString>Parameter or Variable: PHSPHT;
Abbreviation: PHSPHT;
Unit: UMOL/KG;
Controlled vocabulary name: phosphate;
In-situ / Manipulation / Response variable: in-situ observation</gco:CharacterString>
              </gmd:description>
            </gmi:LE_ProcessStep>
          </gmd:processStep>
          <gmd:processStep>
            <gmi:LE_ProcessStep>
              <gmd:description>
                <gco:CharacterString>Parameter or Variable: CFC-11;
Abbreviation: CFC-11;
Unit: PMOL/KG;
Controlled vocabulary name: CHLOROFLUOROCARBON-11 (CFC-11);
In-situ / Manipulation / Response variable: in-situ observation</gco:CharacterString>
              </gmd:description>
            </gmi:LE_ProcessStep>
          </gmd:processStep>
          <gmd:processStep>
            <gmi:LE_ProcessStep>
              <gmd:description>
                <gco:CharacterString>Parameter or Variable: CFC-12;
Abbreviation: CFC-12;
Unit: PMOL/KG;
Controlled vocabulary name: CHLOROFLUOROCARBON-12 (CFC-12);
In-situ / Manipulation / Response variable: in-situ observation</gco:CharacterString>
              </gmd:description>
            </gmi:LE_ProcessStep>
          </gmd:processStep>
          <gmd:processStep>
            <gmi:LE_ProcessStep>
              <gmd:description>
                <gco:CharacterString>Parameter or Variable: SF6;
Abbreviation: SF6;
Unit: FMOL/KG;
Controlled vocabulary name: Sulfur Hexaflouride (SF6);
In-situ / Manipulation / Response variable: in-situ observation</gco:CharacterString>
              </gmd:description>
            </gmi:LE_ProcessStep>
          </gmd:processStep>
          <gmd:processStep>
            <gmi:LE_ProcessStep>
              <gmd:description>
                <gco:CharacterString>Parameter or Variable: CCL4;
Abbreviation: CCL4;
Unit: PMOL/KG;
Controlled vocabulary name: Carbon tetrachloride (CCL4);
In-situ / Manipulation / Response variable: in-situ observation</gco:CharacterString>
              </gmd:description>
            </gmi:LE_ProcessStep>
          </gmd:processStep>
          <gmd:processStep>
            <gmi:LE_ProcessStep>
              <gmd:description>
                <gco:CharacterString>Parameter or Variable: TCARBN;
Abbreviation: TCARBN;
Unit: UMOL/KG;
Controlled vocabulary name: DISSOLVED INORGANIC CARBON (DIC);
In-situ / Manipulation / Response variable: in-situ observation</gco:CharacterString>
              </gmd:description>
            </gmi:LE_ProcessStep>
          </gmd:processStep>
          <gmd:processStep>
            <gmi:LE_ProcessStep>
              <gmd:description>
                <gco:CharacterString>Parameter or Variable: ALKALI;
Abbreviation: ALKALI;
Unit: UMOL/KG;
Controlled vocabulary name: total alkalinity;
In-situ / Manipulation / Response variable: in-situ observation</gco:CharacterString>
              </gmd:description>
            </gmi:LE_ProcessStep>
          </gmd:processStep>
          <gmd:processStep>
            <gmi:LE_ProcessStep>
              <gmd:description>
                <gco:CharacterString>Parameter or Variable: FCO2;
Abbreviation: FCO2;
Unit: UATM;
Controlled vocabulary name: partial pressure of carbon dioxide - water;
In-situ / Manipulation / Response variable: in-situ observation</gco:CharacterString>
              </gmd:description>
            </gmi:LE_ProcessStep>
          </gmd:processStep>
          <gmd:processStep>
            <gmi:LE_ProcessStep>
              <gmd:description>
                <gco:CharacterString>Parameter or Variable: FCO2TMP;
Abbreviation: FCO2TMP;
Unit: DEG_C;
Controlled vocabulary name: partial pressure of carbon dioxide - water;
In-situ / Manipulation / Response variable: in-situ observation</gco:CharacterString>
              </gmd:description>
            </gmi:LE_ProcessStep>
          </gmd:processStep>
          <gmd:processStep>
            <gmi:LE_ProcessStep>
              <gmd:description>
                <gco:CharacterString>Parameter or Variable: PH;
Abbreviation: PH;
Unit: TOT@25C;
Controlled vocabulary name: pH;
In-situ / Manipulation / Response variable: in-situ observation</gco:CharacterString>
              </gmd:description>
            </gmi:LE_ProcessStep>
          </gmd:processStep>
          <gmd:processStep>
            <gmi:LE_ProcessStep>
              <gmd:description>
                <gco:CharacterString>Parameter or Variable: PH_TMP;
Abbreviation: PH_TMP;
Unit: DEG_C;
Controlled vocabulary name: pH;
In-situ / Manipulation / Response variable: in-situ observation</gco:CharacterString>
              </gmd:description>
            </gmi:LE_ProcessStep>
          </gmd:processStep>
          <gmd:processStep>
            <gmi:LE_ProcessStep>
              <gmd:description>
                <gco:CharacterString>Parameter or Variable: DOC;
Abbreviation: DOC;
Unit: UMOL/KG;
Controlled vocabulary name: DISSOLVED ORGANIC CARBON;
In-situ / Manipulation / Response variable: in-situ observation</gco:CharacterString>
              </gmd:description>
            </gmi:LE_ProcessStep>
          </gmd:processStep>
        </gmd:LI_Lineage>
      </gmd:lineage>
    </gmd:DQ_DataQuality>
  </gmd:dataQualityInfo>
  <gmd:dataQualityInfo>
    <gmd:DQ_DataQuality>
      <gmd:scope>
        <gmd:DQ_Scope>
          <gmd:level>
            <gmd:MD_ScopeCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#MD_ScopeCode" codeListValue="repository">repository</gmd:MD_ScopeCode>
          </gmd:level>
          <gmd:levelDescription>
            <gmd:MD_ScopeDescription>
              <gmd:other>
                <gco:CharacterString>NOAA National Centers for Environmental Information</gco:CharacterString>
              </gmd:other>
            </gmd:MD_ScopeDescription>
          </gmd:levelDescription>
        </gmd:DQ_Scope>
      </gmd:scope>
      <gmd:lineage>
        <gmd:LI_Lineage>
          <gmd:processStep>
            <gmi:LE_ProcessStep>
              <gmd:description>
                <gco:CharacterString>NOAA created the National Centers for Environmental Information (NCEI) by merging NOAA's National Climatic Data Center (NCDC), National Geophysical Data Center (NGDC), and National Oceanographic Data Center (NODC), including the National Coastal Data Development Center (NCDDC), per the Consolidated and Further Continuing Appropriations Act, 2015, Public Law 113-235. NCEI launched publicly on April 22, 2015.</gco:CharacterString>
              </gmd:description>
              <gmd:dateTime>
                <gco:DateTime>2015-04-22T00:00:00</gco:DateTime>
              </gmd:dateTime>
            </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_beec">
          <gmi:identifier>
            <gmd:MD_Identifier>
              <gmd:code>
                <gco:CharacterString>bottle</gco:CharacterString>
              </gmd:code>
            </gmd:MD_Identifier>
          </gmi:identifier>
          <gmi:type>
            <gco:CharacterString>bottle</gco:CharacterString>
          </gmi:type>
          <gmi:description>
            <gco:CharacterString>any type of water bottle sampling device

Generic name for water collection device; usually used to determine temperature, salinity and provide water aliquots for measurement of a wide range of parameters; often referred to by a specific type of water sampling bottle, such as a Nansen or Niskin bottle.</gco:CharacterString>
          </gmi:description>
        </gmi:MI_Instrument>
      </gmi:instrument>
      <gmi:instrument>
        <gmi:MI_Instrument id="inst_be58">
          <gmi:identifier>
            <gmd:MD_Identifier>
              <gmd:code>
                <gco:CharacterString>carbon dioxide (CO2) gas analyzer</gco:CharacterString>
              </gmd:code>
            </gmd:MD_Identifier>
          </gmi:identifier>
          <gmi:type>
            <gco:CharacterString>carbon dioxide (CO2) gas analyzer</gco:CharacterString>
          </gmi:type>
          <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>
          </gmi:description>
        </gmi:MI_Instrument>
      </gmi:instrument>
      <gmi:instrument>
        <gmi:MI_Instrument id="inst_be29">
          <gmi:identifier>
            <gmd:MD_Identifier>
              <gmd:code>
                <gco:CharacterString>coulometer for DIC measurement</gco:CharacterString>
              </gmd:code>
            </gmd:MD_Identifier>
          </gmi:identifier>
          <gmi:type>
            <gco:CharacterString>coulometer for DIC measurement</gco:CharacterString>
          </gmi:type>
          <gmi:description>
            <gco:CharacterString>measures dissolved inorganic carbon (DIC)

A known amount of seawater is dispensed into a stripping chamber where it is acidified and purged with an inert gas. The amount of CO2 in the resulting gas stream is determined by absorbing the CO2 in an absorbent. The pH of the solution is monitored by measuring the transmittance .</gco:CharacterString>
          </gmi:description>
        </gmi:MI_Instrument>
      </gmi:instrument>
      <gmi:instrument>
        <gmi:MI_Instrument id="inst_bee7">
          <gmi:identifier>
            <gmd:MD_Identifier>
              <gmd:code>
                <gco:CharacterString>CTD</gco:CharacterString>
              </gmd:code>
            </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_be26">
          <gmi:identifier>
            <gmd:MD_Identifier>
              <gmd:code>
                <gco:CharacterString>flask with closed headspace for discrete CO2 measurement</gco:CharacterString>
              </gmd:code>
            </gmd:MD_Identifier>
          </gmi:identifier>
          <gmi:type>
            <gco:CharacterString>flask with closed headspace for discrete CO2 measurement</gco:CharacterString>
          </gmi:type>
          <gmi:description>
            <gco:CharacterString>discrete carbon dioxide (CO2) measurement</gco:CharacterString>
          </gmi:description>
        </gmi:MI_Instrument>
      </gmi:instrument>
      <gmi:instrument>
        <gmi:MI_Instrument id="inst_be73">
          <gmi:identifier>
            <gmd:MD_Identifier>
              <gmd:code>
                <gco:CharacterString>spectrophotometer</gco:CharacterString>
              </gmd:code>
            </gmd:MD_Identifier>
          </gmi:identifier>
          <gmi:type>
            <gco:CharacterString>spectrophotometer</gco:CharacterString>
          </gmi:type>
          <gmi:description>
            <gco:CharacterString>spectrophotometer, optical spectrometer, spectrograph or spectroscope

An optical spectrometer (spectrophotometer, spectrograph or spectroscope) is an instrument used to measure properties of light over a specific portion of the electromagnetic spectrum, typically used in spectroscopic analysis to identify materials.

Butler, L. R. P.; Laqua, K. (1995). "Nomenclature, symbols, units and their usage in spectrochemical analysis-IX. Instrumentation for the spectral dispersion and isolation of optical radiation (IUPAC Recommendations 1995)". Pure Appl. Chem. IUPAC. 67 (10): 1725–1744. doi:10.1351/pac199567101725. A spectrometer is the general term for describing a combination of spectral apparatus with one or more detectors to measure the intensity of one or more spectral bands."</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_9c5b">
          <gmi:identifier>
            <gmd:MD_Identifier>
              <gmd:code>
                <gco:CharacterString>NOAA Ship Ronald H. Brown</gco:CharacterString>
              </gmd:code>
            </gmd:MD_Identifier>
          </gmi:identifier>
          <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>
          </gmi:description>
          <gmi:instrument gco:nilReason="missing" />
        </gmi:MI_Platform>
      </gmi:platform>
    </gmi:MI_AcquisitionInformation>
  </gmi:acquisitionInformation>
</gmi:MI_Metadata>