From the subtropics to the equator in the Southwest Pacific: Continental material fluxes quantified using neodymium data along modeled thermocline water pathways
Identifieur interne : 001341 ( Istex/Corpus ); précédent : 001340; suivant : 001342From the subtropics to the equator in the Southwest Pacific: Continental material fluxes quantified using neodymium data along modeled thermocline water pathways
Auteurs : Mélanie Grenier ; Catherine Jeandel ; Sophie CravatteSource :
- Journal of Geophysical Research: Oceans [ 2169-9275 ] ; 2014-06.
Abstract
The southwestern tropical Pacific, part of a major pathway for waters feeding the Equatorial Undercurrent, is a region of important geochemical enrichment through land‐ocean boundary exchange. Here we develop an original method based on the coupling between dynamical modeling and geochemical tracer data to identify regions of enrichment along the water pathways from the subtropics to the equator, and to allow a refined quantification of continental material fluxes. Neodymium data are interpreted with the help of modeled Lagrangian trajectories of an Ocean General Circulation Model. We reveal that upper and lower thermocline waters have different pathways together with different geochemical evolutions. The upper thermocline waters entering the Solomon Sea mainly originate from the central subtropical gyre, enter the Coral Sea in the North Vanuatu Jet and likely receive radiogenic neodymium from the basaltic island margins encountered along their route. The lower thermocline waters entering the Solomon Sea mainly originate from northeast of New Zealand and enter the Coral Sea in the North Caledonian Jet. Depletion of their neodymium content likely occurs when flowing along the Australian and Papua coasts. Downstream from the Solomon Sea, waters flowing along the Papua New Guinea margins near the Sepik river mouth become surprisingly depleted in their neodymium content in the upper thermocline while enriched in the lower thermocline. This coupled approach is proposed as strong support to interpret the origin of the equatorial Pacific natural fertilization through a better understanding of the circulation, important objectives of the international GEOTRACES and SPICE programs, respectively.
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DOI: 10.1002/2013JC009670
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uniqKey="Jeandel C" first="Catherine" last="Jeandel">Catherine Jeandel</name><affiliation><mods:affiliation>LEGOS, Université de Toulouse, Centre National de la Recherche Scientifique, Centre National des Etudes Spatiales, Institut de Recherche pour le Développement, Toulouse, France</mods:affiliation></affiliation></author><author><name sortKey="Cravatte, Sophie" sort="Cravatte, Sophie" uniqKey="Cravatte S" first="Sophie" last="Cravatte">Sophie Cravatte</name><affiliation><mods:affiliation>LEGOS, Université de Toulouse, Centre National de la Recherche Scientifique, Centre National des Etudes Spatiales, Institut de Recherche pour le Développement, Toulouse, France</mods:affiliation></affiliation><affiliation><mods:affiliation>IRD, Centre IRD de Nouméa, New Caledonia, Nouméa, France</mods:affiliation></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:6769B5B332476115A9D68C31EF62ACB3E00A2893</idno><date when="2014" 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Antarctic Climate and Ecosystems CRC, IMAS Waterfront Building, Hobart, Tasmania, Australia</mods:affiliation></affiliation><affiliation><mods:affiliation>E-mail: melanie.grenier@utas.edu.au</mods:affiliation></affiliation></author><author><name sortKey="Jeandel, Catherine" sort="Jeandel, Catherine" uniqKey="Jeandel C" first="Catherine" last="Jeandel">Catherine Jeandel</name><affiliation><mods:affiliation>LEGOS, Université de Toulouse, Centre National de la Recherche Scientifique, Centre National des Etudes Spatiales, Institut de Recherche pour le Développement, Toulouse, France</mods:affiliation></affiliation></author><author><name sortKey="Cravatte, Sophie" sort="Cravatte, Sophie" uniqKey="Cravatte S" first="Sophie" last="Cravatte">Sophie Cravatte</name><affiliation><mods:affiliation>LEGOS, Université de Toulouse, Centre National de la Recherche Scientifique, Centre National des Etudes Spatiales, Institut de Recherche pour le Développement, Toulouse, France</mods:affiliation></affiliation><affiliation><mods:affiliation>IRD, Centre IRD de Nouméa, New Caledonia, Nouméa, France</mods:affiliation></affiliation></author></analytic><monogr></monogr><series><title level="j" type="main">Journal of Geophysical Research: Oceans</title><title level="j" type="alt">JOURNAL OF GEOPHYSICAL RESEARCH: OCEANS</title><idno type="ISSN">2169-9275</idno><idno type="eISSN">2169-9291</idno><imprint><biblScope unit="vol">119</biblScope><biblScope unit="issue">6</biblScope><biblScope unit="page" from="3948">3948</biblScope><biblScope unit="page" to="3966">3966</biblScope><biblScope unit="page-count">19</biblScope><date type="published" when="2014-06">2014-06</date></imprint><idno type="ISSN">2169-9275</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">2169-9275</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract">The southwestern tropical Pacific, part of a major pathway for waters feeding the Equatorial Undercurrent, is a region of important geochemical enrichment through land‐ocean boundary exchange. Here we develop an original method based on the coupling between dynamical modeling and geochemical tracer data to identify regions of enrichment along the water pathways from the subtropics to the equator, and to allow a refined quantification of continental material fluxes. Neodymium data are interpreted with the help of modeled Lagrangian trajectories of an Ocean General Circulation Model. We reveal that upper and lower thermocline waters have different pathways together with different geochemical evolutions. The upper thermocline waters entering the Solomon Sea mainly originate from the central subtropical gyre, enter the Coral Sea in the North Vanuatu Jet and likely receive radiogenic neodymium from the basaltic island margins encountered along their route. The lower thermocline waters entering the Solomon Sea mainly originate from northeast of New Zealand and enter the Coral Sea in the North Caledonian Jet. Depletion of their neodymium content likely occurs when flowing along the Australian and Papua coasts. Downstream from the Solomon Sea, waters flowing along the Papua New Guinea margins near the Sepik river mouth become surprisingly depleted in their neodymium content in the upper thermocline while enriched in the lower thermocline. This coupled approach is proposed as strong support to interpret the origin of the equatorial Pacific natural fertilization through a better understanding of the circulation, important objectives of the international GEOTRACES and SPICE programs, respectively.</div></front></TEI><istex><corpusName>wiley</corpusName><author><json:item><name>Mélanie Grenier</name><affiliations><json:string>LEGOS, Université de Toulouse, Centre National de la Recherche Scientifique, Centre National des Etudes Spatiales, Institut de Recherche pour le Développement, Toulouse, France</json:string><json:string>Now at Antarctic Climate and Ecosystems CRC, IMAS Waterfront Building, Hobart, Tasmania, Australia</json:string><json:string>E-mail: melanie.grenier@utas.edu.au</json:string></affiliations></json:item><json:item><name>Catherine Jeandel</name><affiliations><json:string>LEGOS, Université de Toulouse, Centre National de la Recherche Scientifique, Centre National des Etudes Spatiales, Institut de Recherche pour le Développement, Toulouse, France</json:string></affiliations></json:item><json:item><name>Sophie Cravatte</name><affiliations><json:string>LEGOS, Université de Toulouse, Centre National de la Recherche Scientifique, Centre National des Etudes Spatiales, Institut de Recherche pour le Développement, Toulouse, France</json:string><json:string>IRD, Centre IRD de Nouméa, New Caledonia, Nouméa, France</json:string></affiliations></json:item></author><subject><json:item><lang><json:string>eng</json:string></lang><value>southwestern tropical Pacific</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>thermocline</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>water transports</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>dissolved neodymium parameters</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>Lagrangian analysis</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>boundary exchange quantification</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>physical/geochemical coupling</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>SPICE</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>GEOTRACES</value></json:item></subject><articleId><json:string>JGRC20720</json:string></articleId><arkIstex>ark:/67375/WNG-GXWKBVZ1-8</arkIstex><language><json:string>eng</json:string></language><originalGenre><json:string>article</json:string></originalGenre><abstract>The southwestern tropical Pacific, part of a major pathway for waters feeding the Equatorial Undercurrent, is a region of important geochemical enrichment through land‐ocean boundary exchange. Here we develop an original method based on the coupling between dynamical modeling and geochemical tracer data to identify regions of enrichment along the water pathways from the subtropics to the equator, and to allow a refined quantification of continental material fluxes. Neodymium data are interpreted with the help of modeled Lagrangian trajectories of an Ocean General Circulation Model. We reveal that upper and lower thermocline waters have different pathways together with different geochemical evolutions. The upper thermocline waters entering the Solomon Sea mainly originate from the central subtropical gyre, enter the Coral Sea in the North Vanuatu Jet and likely receive radiogenic neodymium from the basaltic island margins encountered along their route. The lower thermocline waters entering the Solomon Sea mainly originate from northeast of New Zealand and enter the Coral Sea in the North Caledonian Jet. Depletion of their neodymium content likely occurs when flowing along the Australian and Papua coasts. Downstream from the Solomon Sea, waters flowing along the Papua New Guinea margins near the Sepik river mouth become surprisingly depleted in their neodymium content in the upper thermocline while enriched in the lower thermocline. 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Grenier, melanie.grenier@utas.edu.au</affiliation></author><author xml:id="author-0001"><persName><forename type="first">Catherine</forename><surname>Jeandel</surname></persName><affiliation><orgName>LEGOS, Université de Toulouse</orgName><orgName>Centre National de la Recherche Scientifique</orgName><orgName>Centre National des Etudes Spatiales</orgName><orgName>Institut de Recherche pour le Développement</orgName><address><settlement type="city">Toulouse</settlement><country key="FR">France</country></address></affiliation></author><author xml:id="author-0002"><persName><forename type="first">Sophie</forename><surname>Cravatte</surname></persName><affiliation><orgName>LEGOS, Université de Toulouse</orgName><orgName>Centre National de la Recherche Scientifique</orgName><orgName>Centre National des Etudes Spatiales</orgName><orgName>Institut de Recherche pour le Développement</orgName><address><settlement type="city">Toulouse</settlement><country key="FR">France</country></address></affiliation><affiliation><orgName>IRD</orgName><orgName>Centre IRD de Nouméa</orgName><orgName>New Caledonia</orgName><address><settlement type="city">Nouméa</settlement><country key="FR">France</country></address></affiliation></author><idno type="istex">6769B5B332476115A9D68C31EF62ACB3E00A2893</idno><idno type="ark">ark:/67375/WNG-GXWKBVZ1-8</idno><idno type="DOI">10.1002/2013JC009670</idno><idno type="unit">JGRC20720</idno><idno type="toTypesetVersion">file:JGRC.JGRC20720.pdf</idno></analytic><monogr><title level="j" type="main">Journal of Geophysical Research: Oceans</title><title level="j" type="alt">JOURNAL OF GEOPHYSICAL RESEARCH: OCEANS</title><idno type="pISSN">2169-9275</idno><idno type="eISSN">2169-9291</idno><idno type="book-DOI">10.1002/(ISSN)2169-9291</idno><idno type="book-part-DOI">10.1002/jgrc.v119.6</idno><idno type="product">JGRC</idno><imprint><biblScope unit="vol">119</biblScope><biblScope unit="issue">6</biblScope><biblScope unit="page" from="3948">3948</biblScope><biblScope unit="page" to="3966">3966</biblScope><biblScope unit="page-count">19</biblScope><date type="published" when="2014-06"></date></imprint></monogr></biblStruct></sourceDesc></fileDesc><profileDesc><abstract style="main"><head>Abstract</head><p>The southwestern tropical Pacific, part of a major pathway for waters feeding the Equatorial Undercurrent, is a region of important geochemical enrichment through land‐ocean boundary exchange. Here we develop an original method based on the coupling between dynamical modeling and geochemical tracer data to identify regions of enrichment along the water pathways from the subtropics to the equator, and to allow a refined quantification of continental material fluxes. Neodymium data are interpreted with the help of modeled Lagrangian trajectories of an Ocean General Circulation Model. We reveal that upper and lower thermocline waters have different pathways together with different geochemical evolutions. The upper thermocline waters entering the Solomon Sea mainly originate from the central subtropical gyre, enter the Coral Sea in the North Vanuatu Jet and likely receive radiogenic neodymium from the basaltic island margins encountered along their route. The lower thermocline waters entering the Solomon Sea mainly originate from northeast of New Zealand and enter the Coral Sea in the North Caledonian Jet. Depletion of their neodymium content likely occurs when flowing along the Australian and Papua coasts. Downstream from the Solomon Sea, waters flowing along the Papua New Guinea margins near the Sepik river mouth become surprisingly depleted in their neodymium content in the upper thermocline while enriched in the lower thermocline. This coupled approach is proposed as strong support to interpret the origin of the equatorial Pacific natural fertilization through a better understanding of the circulation, important objectives of the international GEOTRACES and SPICE programs, respectively.</p></abstract><abstract style="short"><head>Key Points</head><p><list xml:id="jgrc20720-list-0001" style="bulleted"><item>SW Pacific thermocline layers have contrasted pathways and geochemical evolutions</item><item>The PNG margins and river discharges seem to play an important and complex role</item><item>We present an original model‐data coupling to quantify oceanic processes</item></list></p></abstract><textClass><keywords><term xml:id="jgrc20720-kwd-0001">southwestern tropical Pacific</term><term xml:id="jgrc20720-kwd-0002">thermocline</term><term xml:id="jgrc20720-kwd-0003">water transports</term><term xml:id="jgrc20720-kwd-0004">dissolved neodymium parameters</term><term xml:id="jgrc20720-kwd-0005">Lagrangian analysis</term><term xml:id="jgrc20720-kwd-0006">boundary exchange quantification</term><term xml:id="jgrc20720-kwd-0007">physical/geochemical coupling</term><term xml:id="jgrc20720-kwd-0008">SPICE</term><term xml:id="jgrc20720-kwd-0009">GEOTRACES</term></keywords><classCode scheme="http://psi.agu.org/specialSection/WPOCC1">Western Pacific Ocean Circulation and Climate</classCode><classCode scheme="http://psi.agu.org/taxonomy5/4200">Oceanography: General</classCode><classCode scheme="http://psi.agu.org/taxonomy5/1000">Geochemistry</classCode><classCode scheme="http://psi.agu.org/taxonomy5/4800">Oceanography: Biological and Chemical</classCode><classCode scheme="http://psi.agu.org/taxonomy5/4500">Oceanography: Physical</classCode><classCode scheme="http://psi.agu.org/taxonomy5/1200">Geodesy and Gravity</classCode><keywords rend="articleCategory"><term>Research Article</term></keywords><keywords rend="tocHeading1"><term>Research Articles</term></keywords></textClass><langUsage><language ident="en"></language></langUsage></profileDesc></teiHeader></istex:fulltextTEI></fulltext><metadata><istex:metadataXml wicri:clean="Wiley, elements deleted: body"><istex:xmlDeclaration>version="1.0" encoding="UTF-8" standalone="yes"</istex:xmlDeclaration><istex:document><component version="2.0" type="serialArticle" xml:lang="en" xml:id="jgrc20720"><header><publicationMeta level="product"><doi origin="wiley" registered="yes">10.1002/(ISSN)2169-9291</doi><issn type="print">2169-9275</issn><issn type="electronic">2169-9291</issn><idGroup><id type="product" value="JGRC"></id></idGroup><titleGroup><title type="main" sort="JOURNAL OF GEOPHYSICAL RESEARCH: OCEANS">Journal of Geophysical Research: Oceans</title><title type="short">J. 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All Rights Reserved.</copyright><eventGroup><event type="manuscriptReceived" date="2013-12-03"></event><event type="manuscriptRevised" date="2014-04-17"></event><event type="manuscriptAccepted" date="2014-05-21"></event><event type="xmlCreated" agent="Cenveo Publisher Services" date="2014-05-26"></event><event type="publishedOnlineAccepted" date="2014-05-26"></event><event type="publishedOnlineEarlyUnpaginated" date="2014-06-24"></event><event type="publishedOnlineFinalForm" date="2014-07-14"></event><event type="firstOnline" date="2014-06-24"></event><event type="xmlConverted" agent="Converter:WML3G_To_WML3G version:4.7.5 mode:FullText" date="2016-01-28"></event></eventGroup><numberingGroup><numbering type="pageFirst">3948</numbering><numbering type="pageLast">3966</numbering></numberingGroup><correspondenceTo>Correspondence to: M. Grenier, <email>melanie.grenier@utas.edu.au</email></correspondenceTo><subjectInfo><subject href="http://psi.agu.org/specialSection/WPOCC1">Western Pacific Ocean Circulation and Climate</subject><subject href="http://psi.agu.org/taxonomy5/4200">Oceanography: General</subject><subjectInfo><subject href="http://psi.agu.org/taxonomy5/4271">Physical and chemical properties of seawater</subject></subjectInfo><subject href="http://psi.agu.org/taxonomy5/1000">Geochemistry</subject><subjectInfo><subject href="http://psi.agu.org/taxonomy5/1050">Marine geochemistry</subject><subject href="http://psi.agu.org/taxonomy5/1040">Radiogenic isotope geochemistry</subject></subjectInfo><subject role="crossTerm" href="http://psi.agu.org/taxonomy5/4800">Oceanography: Biological and Chemical</subject><subjectInfo><subject role="crossTerm" href="http://psi.agu.org/taxonomy5/4835">Marine inorganic chemistry</subject><subject role="crossTerm" href="http://psi.agu.org/taxonomy5/4845">Nutrients and nutrient cycling</subject><subject role="crossTerm" href="http://psi.agu.org/taxonomy5/4850">Marine organic chemistry</subject></subjectInfo><subject href="http://psi.agu.org/taxonomy5/4500">Oceanography: Physical</subject><subjectInfo><subject href="http://psi.agu.org/taxonomy5/4532">General circulation</subject><subject href="http://psi.agu.org/taxonomy5/4576">Western boundary currents</subject></subjectInfo><subject role="crossTerm" href="http://psi.agu.org/taxonomy5/1200">Geodesy and Gravity</subject><subjectInfo><subject role="crossTerm" href="http://psi.agu.org/taxonomy5/1218">Mass balance</subject><subject role="crossTerm" href="http://psi.agu.org/taxonomy5/1222">Ocean monitoring with geodetic techniques</subject></subjectInfo></subjectInfo><selfCitationGroup><citation xml:id="jgrc20720-cit-0057" type="self"><author><familyName>Grenier</familyName>, <givenNames>M.</givenNames></author>,
<author><givenNames>C.</givenNames> <familyName>Jeandel</familyName></author>, and
<author><givenNames>S.</givenNames> <familyName>Cravatte</familyName></author> (<pubYear year="2014">2014</pubYear>), <articleTitle>From the subtropics to the equator in the Southwest Pacific: Continental material fluxes quantified using neodymium data along modeled thermocline water pathways</articleTitle>, <journalTitle>J. Geophys. Res. Oceans</journalTitle>, <vol>119</vol>, <pageFirst>3948</pageFirst>–<pageLast>3966</pageLast>, doi:<accessionId ref="info:doi/10.1002/2013JC009670">10.1002/2013JC009670</accessionId>.
</citation></selfCitationGroup><objectNameGroup><objectName elementName="appendix">Appendix</objectName></objectNameGroup><linkGroup><link type="toTypesetVersion" href="file:JGRC.JGRC20720.pdf"></link></linkGroup></publicationMeta><contentMeta><countGroup><count type="figureTotal" number="8"></count><count type="tableTotal" number="1"></count><count type="wordTotal" number="10095"></count></countGroup><titleGroup><title type="main">From the subtropics to the equator in the Southwest Pacific: Continental material fluxes quantified using neodymium data along modeled thermocline water pathways</title><title type="shortAuthors">GRENIER ET AL.</title></titleGroup><creators><creator affiliationRef="#jgrc20720-aff-0001 #jgrc20720-aff-0002" corresponding="yes" creatorRole="author" xml:id="jgrc20720-cr-0001"><personName><givenNames>Mélanie</givenNames><familyName>Grenier</familyName></personName></creator><creator affiliationRef="#jgrc20720-aff-0001" creatorRole="author" xml:id="jgrc20720-cr-0002"><personName><givenNames>Catherine</givenNames><familyName>Jeandel</familyName></personName></creator><creator affiliationRef="#jgrc20720-aff-0001 #jgrc20720-aff-0003" creatorRole="author" xml:id="jgrc20720-cr-0003"><personName><givenNames>Sophie</givenNames><familyName>Cravatte</familyName></personName></creator></creators><affiliationGroup><affiliation countryCode="FR" type="organization" xml:id="jgrc20720-aff-0001"><orgName>LEGOS, Université de Toulouse</orgName><orgName>Centre National de la Recherche Scientifique</orgName><orgName>Centre National des Etudes Spatiales</orgName><orgName>Institut de Recherche pour le Développement</orgName><address><city>Toulouse</city><country>France</country></address></affiliation><affiliation countryCode="AU" type="organization" xml:id="jgrc20720-aff-0002"><orgDiv>Now at Antarctic Climate and Ecosystems CRC</orgDiv><orgName>IMAS Waterfront Building</orgName><address><city>Tasmania</city><countryPart>Hobart</countryPart><country>Australia</country></address></affiliation><affiliation countryCode="FR" type="organization" xml:id="jgrc20720-aff-0003"><orgName>IRD</orgName><orgName>Centre IRD de Nouméa</orgName><orgName>New Caledonia</orgName><address><city>Nouméa</city><country>France</country></address></affiliation></affiliationGroup><keywordGroup type="author"><keyword xml:id="jgrc20720-kwd-0001">southwestern tropical Pacific</keyword><keyword xml:id="jgrc20720-kwd-0002">thermocline</keyword><keyword xml:id="jgrc20720-kwd-0003">water transports</keyword><keyword xml:id="jgrc20720-kwd-0004">dissolved neodymium parameters</keyword><keyword xml:id="jgrc20720-kwd-0005">Lagrangian analysis</keyword><keyword xml:id="jgrc20720-kwd-0006">boundary exchange quantification</keyword><keyword xml:id="jgrc20720-kwd-0007">physical/geochemical coupling</keyword><keyword xml:id="jgrc20720-kwd-0008">SPICE</keyword><keyword xml:id="jgrc20720-kwd-0009">GEOTRACES</keyword></keywordGroup><abstractGroup><abstract type="main"><title type="main">Abstract</title><p>The southwestern tropical Pacific, part of a major pathway for waters feeding the Equatorial Undercurrent, is a region of important geochemical enrichment through land‐ocean boundary exchange. Here we develop an original method based on the coupling between dynamical modeling and geochemical tracer data to identify regions of enrichment along the water pathways from the subtropics to the equator, and to allow a refined quantification of continental material fluxes. Neodymium data are interpreted with the help of modeled Lagrangian trajectories of an Ocean General Circulation Model. We reveal that upper and lower thermocline waters have different pathways together with different geochemical evolutions. The upper thermocline waters entering the Solomon Sea mainly originate from the central subtropical gyre, enter the Coral Sea in the North Vanuatu Jet and likely receive radiogenic neodymium from the basaltic island margins encountered along their route. The lower thermocline waters entering the Solomon Sea mainly originate from northeast of New Zealand and enter the Coral Sea in the North Caledonian Jet. Depletion of their neodymium content likely occurs when flowing along the Australian and Papua coasts. Downstream from the Solomon Sea, waters flowing along the Papua New Guinea margins near the Sepik river mouth become surprisingly depleted in their neodymium content in the upper thermocline while enriched in the lower thermocline. This coupled approach is proposed as strong support to interpret the origin of the equatorial Pacific natural fertilization through a better understanding of the circulation, important objectives of the international GEOTRACES and SPICE programs, respectively.</p></abstract><abstract type="short"><title type="main">Key Points</title><p><list xml:id="jgrc20720-list-0001" style="bulleted"><listItem xml:id="jgrc20720-li-0001">SW Pacific thermocline layers have contrasted pathways and geochemical evolutions</listItem><listItem xml:id="jgrc20720-li-0002">The PNG margins and river discharges seem to play an important and complex role</listItem><listItem xml:id="jgrc20720-li-0003">We present an original model‐data coupling to quantify oceanic processes</listItem></list></p></abstract></abstractGroup></contentMeta></header></component></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>From the subtropics to the equator in the Southwest Pacific: Continental material fluxes quantified using neodymium data along modeled thermocline water pathways</title></titleInfo><titleInfo type="alternative" contentType="CDATA" lang="en"><title>From the subtropics to the equator in the Southwest Pacific: Continental material fluxes quantified using neodymium data along modeled thermocline water pathways</title></titleInfo><name type="personal"><namePart type="given">Mélanie</namePart><namePart type="family">Grenier</namePart><affiliation>LEGOS, Université de Toulouse, Centre National de la Recherche Scientifique, Centre National des Etudes Spatiales, Institut de Recherche pour le Développement, Toulouse, France</affiliation><affiliation>Now at Antarctic Climate and Ecosystems CRC, IMAS Waterfront Building, Hobart, Tasmania, Australia</affiliation><affiliation>E-mail: melanie.grenier@utas.edu.au</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Catherine</namePart><namePart type="family">Jeandel</namePart><affiliation>LEGOS, Université de Toulouse, Centre National de la Recherche Scientifique, Centre National des Etudes Spatiales, Institut de Recherche pour le Développement, Toulouse, France</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Sophie</namePart><namePart type="family">Cravatte</namePart><affiliation>LEGOS, Université de Toulouse, Centre National de la Recherche Scientifique, Centre National des Etudes Spatiales, Institut de Recherche pour le Développement, Toulouse, France</affiliation><affiliation>IRD, Centre IRD de Nouméa, New Caledonia, Nouméa, France</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="article" displayLabel="article" authority="ISTEX" authorityURI="https://content-type.data.istex.fr" valueURI="https://content-type.data.istex.fr/ark:/67375/XTP-6N5SZHKN-D">article</genre><originInfo><publisher>Blackwell Publishing Ltd</publisher><dateIssued encoding="w3cdtf">2014-06</dateIssued><dateCreated encoding="w3cdtf">2014-05-26</dateCreated><dateCaptured encoding="w3cdtf">2013-12-03</dateCaptured><dateValid encoding="w3cdtf">2014-05-21</dateValid><edition>Grenier, M., C. Jeandel, and S. Cravatte (2014), From the subtropics to the equator in the Southwest Pacific: Continental material fluxes quantified using neodymium data along modeled thermocline water pathways, J. Geophys. Res. Oceans, 119, 3948–3966, doi:10.1002/2013JC009670.</edition><copyrightDate encoding="w3cdtf">2014</copyrightDate></originInfo><language><languageTerm type="code" authority="rfc3066">en</languageTerm><languageTerm type="code" authority="iso639-2b">eng</languageTerm></language><physicalDescription><extent unit="figures">8</extent><extent unit="tables">1</extent><extent unit="words">10095</extent></physicalDescription><abstract>The southwestern tropical Pacific, part of a major pathway for waters feeding the Equatorial Undercurrent, is a region of important geochemical enrichment through land‐ocean boundary exchange. Here we develop an original method based on the coupling between dynamical modeling and geochemical tracer data to identify regions of enrichment along the water pathways from the subtropics to the equator, and to allow a refined quantification of continental material fluxes. Neodymium data are interpreted with the help of modeled Lagrangian trajectories of an Ocean General Circulation Model. We reveal that upper and lower thermocline waters have different pathways together with different geochemical evolutions. The upper thermocline waters entering the Solomon Sea mainly originate from the central subtropical gyre, enter the Coral Sea in the North Vanuatu Jet and likely receive radiogenic neodymium from the basaltic island margins encountered along their route. The lower thermocline waters entering the Solomon Sea mainly originate from northeast of New Zealand and enter the Coral Sea in the North Caledonian Jet. Depletion of their neodymium content likely occurs when flowing along the Australian and Papua coasts. Downstream from the Solomon Sea, waters flowing along the Papua New Guinea margins near the Sepik river mouth become surprisingly depleted in their neodymium content in the upper thermocline while enriched in the lower thermocline. This coupled approach is proposed as strong support to interpret the origin of the equatorial Pacific natural fertilization through a better understanding of the circulation, important objectives of the international GEOTRACES and SPICE programs, respectively.</abstract><abstract type="short">SW Pacific thermocline layers have contrasted pathways and geochemical evolutions The PNG margins and river discharges seem to play an important and complex role We present an original model‐data coupling to quantify oceanic processes</abstract><subject><genre>keywords</genre><topic>southwestern tropical Pacific</topic><topic>thermocline</topic><topic>water transports</topic><topic>dissolved neodymium parameters</topic><topic>Lagrangian analysis</topic><topic>boundary exchange quantification</topic><topic>physical/geochemical coupling</topic><topic>SPICE</topic><topic>GEOTRACES</topic></subject><relatedItem type="host"><titleInfo><title>Journal of Geophysical Research: Oceans</title></titleInfo><titleInfo type="abbreviated"><title>J. Geophys. Res. Oceans</title></titleInfo><genre type="journal" authority="ISTEX" authorityURI="https://publication-type.data.istex.fr" valueURI="https://publication-type.data.istex.fr/ark:/67375/JMC-0GLKJH51-B">journal</genre><subject><genre>index-terms</genre><topic authorityURI="http://psi.agu.org/specialSection/WPOCC1">Western Pacific Ocean Circulation and Climate</topic><topic authorityURI="http://psi.agu.org/taxonomy5/4200">Oceanography: General</topic><topic authorityURI="http://psi.agu.org/taxonomy5/4271">Physical and chemical properties of seawater</topic><topic authorityURI="http://psi.agu.org/taxonomy5/1000">Geochemistry</topic><topic authorityURI="http://psi.agu.org/taxonomy5/1050">Marine geochemistry</topic><topic authorityURI="http://psi.agu.org/taxonomy5/1040">Radiogenic isotope geochemistry</topic><topic authorityURI="http://psi.agu.org/taxonomy5/4800">Oceanography: Biological and Chemical</topic><topic authorityURI="http://psi.agu.org/taxonomy5/4835">Marine inorganic chemistry</topic><topic authorityURI="http://psi.agu.org/taxonomy5/4845">Nutrients and nutrient cycling</topic><topic authorityURI="http://psi.agu.org/taxonomy5/4850">Marine organic chemistry</topic><topic authorityURI="http://psi.agu.org/taxonomy5/4500">Oceanography: Physical</topic><topic authorityURI="http://psi.agu.org/taxonomy5/4532">General circulation</topic><topic authorityURI="http://psi.agu.org/taxonomy5/4576">Western boundary currents</topic><topic authorityURI="http://psi.agu.org/taxonomy5/1200">Geodesy and Gravity</topic><topic authorityURI="http://psi.agu.org/taxonomy5/1218">Mass balance</topic><topic authorityURI="http://psi.agu.org/taxonomy5/1222">Ocean monitoring with geodetic techniques</topic></subject><subject><genre>article-category</genre><topic>Research Article</topic></subject><identifier type="ISSN">2169-9275</identifier><identifier type="eISSN">2169-9291</identifier><identifier type="DOI">10.1002/(ISSN)2169-9291</identifier><identifier type="PublisherID">JGRC</identifier><part><date>2014</date><detail type="volume"><caption>vol.</caption><number>119</number></detail><detail type="issue"><caption>no.</caption><number>6</number></detail><extent unit="pages"><start>3948</start><end>3966</end><total>19</total></extent></part></relatedItem><identifier type="istex">6769B5B332476115A9D68C31EF62ACB3E00A2893</identifier><identifier type="ark">ark:/67375/WNG-GXWKBVZ1-8</identifier><identifier type="DOI">10.1002/2013JC009670</identifier><identifier type="ArticleID">JGRC20720</identifier><accessCondition type="use and reproduction" contentType="copyright">© 2014. 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