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        <gco:CharacterString>Methods and Sampling: &amp;lt;p&amp;gt;Unfiltered seawater samples were collected using a Sea-Bird Electronic SBE conductivity, temperature, and pressure (CTD) sensors attached to a rosette. For major ion analysis, unfiltered seawater samples (ca. 7 mL) were stored in precleaned 10 mL Simport cryovials and frozen until further analysis using ion chromatography.&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;Seven major ionic species were analyzed using the method outlined in Keene et al. (2007). A Dionex dual channel model ICS 6000 high-performance ion chromatograph (ICS-6000 DP) was used to perform sample analysis. The anion channel was configured with Thermo Scientific Dionex guard (IonPac AG 18: 4 x 50 mm). The cation channel was configured with&amp;amp;nbsp;Dionex Guard (IonPac CG12 A: 4 x 50mm) and analytical (IonPacCG12A: 4 x 250mm) columns and a Thermo Scientific Dionex electrolytically regenerated suppressor (ADRS 600: 4mm). The ion chromatograph was equipped with a Dionex AS-AP autosampler with the temperature set at 20°C, eluent generator cartridges (500 MSA, 500 KOH), ICS-6000 pumps, and Chromeleon 7 software.&amp;lt;/p&amp;gt;</gco:CharacterString>
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        <gmx:Anchor xlink:href="http://lod.bco-dmo.org/id/award/851030.rdf" xlink:title="OCE-2023104" xlink:actuate="onRequest">Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-2023104 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=2023104</gmx:Anchor>
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Â» International SOLAS Web site
Science Implementation Strategy Reports
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&lt;p&gt;The oceans hold a massive quantity of organic carbon that is greater than all terrestrial organic carbon biomass combined. Nearly all marine organic carbon is dissolved. On average, it is thousands of years old, chemically stable, and carried throughout the entire ocean several times before complete removal. However, little is known about the processes that produce and remove this old carbon, referred to as refractory dissolved organic carbon (RDOC). One potential removal pathway involves RDOC adhering onto the surfaces of rising bubbles produced by breaking waves. The bubbles ultimately burst at the sea surface, ejecting tiny particles (primary marine aerosol, “PMA”) that carry the RDOC into the atmosphere. Most of this PMA organic carbon is associated with the smallest particles (less than 1 μm diameter) that drift in the atmosphere for several days to weeks. During this time, RDOC in these particles can be degraded photochemically (by sunlight), partially transported landward, and/or returned to the sea. When this RDOC is converted to inorganic carbon (e.g., carbon dioxide) or degraded to more reactive constituents in the atmosphere, it is effectively removed from the marine RDOC reservoir. Based on preliminary results, the annual rate at which RDOC is removed from the ocean by this process is similar to all other known RDOC losses (interactions with particles, biological degradation, and hydrothermal circulation), except for photochemical degradation in seawater. Building on this prior research, this project will identify seasonal changes in the removal of RDOC from the oceans through this process during three research cruises to the northwestern Atlantic Ocean. Results from this project will provide important findings about the coupled ocean-atmosphere loss of RDOC and improve understanding of the role of RDOC in the global carbon cycle and Earth's climate. The research will involve two early career faculty, and will provide training for undergraduate, graduate, and postdoctoral researchers.&lt;/p&gt;
&lt;p&gt;Radiocarbon (C-14) measurements indicate that RDOC comprises 19 to 40 % of the organic carbon associated with PMA produced by bursting bubbles at the sea surface. Injection of RDOC into the atmosphere in association with PMA is a potentially important process that removes as much as 2 to 20 Tg RDOC yr-1 from the oceans. This project will measure seasonal variations in the PMA-mediated emission of marine RDOC to the atmosphere by quantifying: (1) the fraction of RDOC in PMA OC and (2) its relationship to the abundance of biologically produced labile and semi-labile dissolved organic matter in near surface seawater. These relationships will be evaluated at the Bermuda Atlantic Time-series Station during three research cruises (one in July, two in January). During the cruises, the investigators will measure: (1) the natural abundance C-14 values for PMA and its organic source materials in seawater; (2) the dynamic and equilibrium surface tension and physical properties of seawater, including bubble size distributions; (3) concentrations of major ions, organic carbon, carbohydrates, peptides and proteins, and surfactants in PMA; and (4) chromophoric dissolved organic matter (CDOM) and the concentrations of dissolved organic carbon, chlorophyll a, major ions, carbohydrates, peptides and proteins, and surfactants in near-surface seawater and in the sea-surface microlayer. Based on these chemical measurements and physical properties, this study will reveal the magnitude and potential controls on RDOC inputs into the atmosphere as a component of PMA.&lt;/p&gt;
&lt;p&gt;This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.&lt;/p&gt;</gco:CharacterString>
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            <gco:CharacterString>PI Supplied Instrument Name: 30 L Niskin bottles PI Supplied Instrument Description:Seawater samples were obtained using 30 L Niskin bottles attached to a CTD rosette. Instrument Name: Niskin bottle Instrument Short Name:Niskin bottle   Instrument Description: A Niskin bottle (a next generation water sampler based on the Nansen bottle) is a cylindrical, non-metallic water collection device with stoppers at both ends. The bottles can be attached individually on a hydrowire or deployed in 12, 24, or 36 bottle Rosette systems mounted on a frame and combined with a CTD. Niskin bottles are used to collect discrete water samples for a range of measurements including pigments, nutrients, plankton, etc. Community Standard Description: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0412/</gco:CharacterString>
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            <gmi:platform>
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    <gmi:citation>
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        <gmd:code>
          <gmx:Anchor xlink:href="http://lod.bco-dmo.org/id/platform/54122.rdf"
           xlink:title="33H4" xlink:actuate="onRequest">R/V Atlantic Explorer</gmx:Anchor>
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      </gmd:MD_Identifier>
    </gmi:identifier>
    <gmi:description>
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    <gmi:instrument gco:nilReason="unknown"/>
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                </gmi:status>
                <gmi:citation>
                  <gmd:CI_Citation>
                    <gmd:title>
                      <gmx:Anchor xlink:href="http://lod.bco-dmo.org/id/deployment/860681.rdf" xlink:title="Cruise" xlink:actuate="onRequest">AE2113</gmx:Anchor>
                    </gmd:title>
                    <gmd:date gco:nilReason="unknown"/>
                    <gmd:citedResponsibleParty>
                      <gmd:CI_ResponsibleParty>
                      <gmd:individualName>
                          <gmx:Anchor xlink:href="http://lod.bco-dmo.org/id/person/708328.rdf" xlink:actuate="onRequest">Steven R. Beaupré</gmx:Anchor>
                        </gmd:individualName>
                        <gmd:organisationName>
                          <gmx:Anchor xlink:href="http://lod.bco-dmo.org/id/affiliation/121.rdf" xlink:title="Affiliation" xlink:actuate="onRequest">Stony Brook University</gmx:Anchor>
                        </gmd:organisationName>
                        <gmd:role>
                        <gmd:CI_RoleCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_RoleCode" codeListValue="principalInvestigator"/>
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              </gmi:MI_Plan>
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            </gmi:MI_Operation>
      </gmi:operation><gmi:operation>
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            <gmi:description>
              <gco:CharacterString>Cruise: AE2303</gco:CharacterString>
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                  <gmx:Anchor xlink:href="http://lod.bco-dmo.org/id/deployment/929877.rdf" xlink:title="Cruise" xlink:actuate="onRequest">AE2303</gmx:Anchor>
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            </gmi:type>
            <gmi:parentOperation gco:nilReason="inapplicable"/>
            <gmi:platform>
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     <gmd:CI_Citation>
       <gmd:title>
         <gmx:Anchor xlink:href="https://bios.asu.edu/research/facilities/atlantic-explorer" xlink:actuate="onRequest">R/V Atlantic Explorer</gmx:Anchor>
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    <gmi:citation>
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       <gmd:title>
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            </gmd:title>
            <gmd:date gco:nilReason="unknown"/>
          </gmd:CI_Citation>
        </gmd:authority>
        <gmd:code>
          <gmx:Anchor xlink:href="http://lod.bco-dmo.org/id/platform/54122.rdf"
           xlink:title="33H4" xlink:actuate="onRequest">R/V Atlantic Explorer</gmx:Anchor>
        </gmd:code>
      </gmd:MD_Identifier>
    </gmi:identifier>
    <gmi:description>
      <gmx:Anchor xlink:href="http://lod.bco-dmo.org/id/platform/54122.rdf" xlink:title="R/V Atlantic Explorer" xlink:actuate="onRequest">vessel</gmx:Anchor>
    </gmi:description>
    <gmi:instrument gco:nilReason="unknown"/>
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</gmi:platform>
            <gmi:plan>
              <gmi:MI_Plan>
                <gmi:status>
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                </gmi:status>
                <gmi:citation>
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                    <gmd:title>
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                    </gmd:title>
                    <gmd:date gco:nilReason="unknown"/>
                    <gmd:citedResponsibleParty>
                      <gmd:CI_ResponsibleParty>
                      <gmd:individualName>
                          <gmx:Anchor xlink:href="http://lod.bco-dmo.org/id/person/708328.rdf" xlink:actuate="onRequest">Steven R. Beaupré</gmx:Anchor>
                        </gmd:individualName>
                        <gmd:organisationName>
                          <gmx:Anchor xlink:href="http://lod.bco-dmo.org/id/affiliation/54.rdf" xlink:title="Affiliation" xlink:actuate="onRequest">Stony Brook University - SoMAS</gmx:Anchor>
                        </gmd:organisationName>
                        <gmd:contactInfo>
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                            <gmd:CI_OnlineResource>
                              <gmd:linkage>
                                <gmd:URL>https://www.rvdata.us/search/cruise/AE2303</gmd:URL>
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                              <gmd:description>
                                <gco:CharacterString>Report describing AE2303</gco:CharacterString>
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                          </gmd:onlineResource>
                        </gmd:CI_Contact>
                      </gmd:contactInfo>
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            </gmi:MI_Operation>
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    </gmi:citation>
    <gmi:citation>
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        <gmd:code>
          <gmx:Anchor xlink:href="http://lod.bco-dmo.org/id/platform/54122.rdf"
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    <gmi:description>
      <gmx:Anchor xlink:href="http://lod.bco-dmo.org/id/platform/54122.rdf" xlink:title="R/V Atlantic Explorer" xlink:actuate="onRequest">vessel</gmx:Anchor>
    </gmi:description>
    <gmi:instrument gco:nilReason="unknown"/>
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