Recent changes in shelf hydrography in the Siberian Arctic: Potential for subsea permafrost instability
Identifieur interne : 001804 ( Main/Exploration ); précédent : 001803; suivant : 001805Recent changes in shelf hydrography in the Siberian Arctic: Potential for subsea permafrost instability
Auteurs : Igor A. Dmitrenko [Allemagne] ; Sergey A. Kirillov [Russie] ; L. Bruno Tremblay [Canada] ; Heidemarie Kassens [Allemagne] ; Oleg A. Anisimov [Russie] ; Sergey A. Lavrov [Russie] ; Sergey O. Razumov [Russie] ; Mikhail N. Grigoriev [Russie]Source :
- Journal of Geophysical Research: Oceans [ 0148-0227 ] ; 2011-10.
Abstract
Summer hydrographic data (1920–2009) show a dramatic warming of the bottom water layer over the eastern Siberian shelf coastal zone (<10 m depth), since the mid‐1980s, by 2.1°C. We attribute this warming to changes in the Arctic atmosphere. The enhanced summer cyclonicity results in warmer air temperatures and a reduction in ice extent, mainly through thermodynamic melting. This leads to a lengthening of the summer open‐water season and to more solar heating of the water column. The permafrost modeling indicates, however, that a significant change in the permafrost depth lags behind the imposed changes in surface temperature, and after 25 years of summer seafloor warming (as observed from 1985 to 2009), the upper boundary of permafrost deepens only by ∼1 m. Thus, the observed increase in temperature does not lead to a destabilization of methane‐bearing subsea permafrost or to an increase in methane emission. The CH4 supersaturation, recently reported from the eastern Siberian shelf, is believed to be the result of the degradation of subsea permafrost that is due to the long‐lasting warming initiated by permafrost submergence about 8000 years ago rather than from those triggered by recent Arctic climate changes. A significant degradation of subsea permafrost is expected to be detectable at the beginning of the next millennium. Until that time, the simulated permafrost table shows a deepening down to ∼70 m below the seafloor that is considered to be important for the stability of the subsea permafrost and the permafrost‐related gas hydrate stability zone.
Url:
DOI: 10.1029/2011JC007218
Affiliations:
Links toward previous steps (curation, corpus...)
- to stream Istex, to step Corpus: 002677
- to stream Istex, to step Curation: 002677
- to stream Istex, to step Checkpoint: 000389
- to stream Main, to step Merge: 001882
- to stream Main, to step Curation: 001804
Le document en format XML
<record><TEI wicri:istexFullTextTei="biblStruct"><teiHeader><fileDesc><titleStmt><title xml:lang="en">Recent changes in shelf hydrography in the Siberian Arctic: Potential for subsea permafrost instability</title><author><name sortKey="Dmitrenko, Igor A" sort="Dmitrenko, Igor A" uniqKey="Dmitrenko I" first="Igor A." last="Dmitrenko">Igor A. Dmitrenko</name></author><author><name sortKey="Kirillov, Sergey A" sort="Kirillov, Sergey A" uniqKey="Kirillov S" first="Sergey A." last="Kirillov">Sergey A. Kirillov</name></author><author><name sortKey="Tremblay, L Bruno" sort="Tremblay, L Bruno" uniqKey="Tremblay L" first="L. Bruno" last="Tremblay">L. Bruno Tremblay</name></author><author><name sortKey="Kassens, Heidemarie" sort="Kassens, Heidemarie" uniqKey="Kassens H" first="Heidemarie" last="Kassens">Heidemarie Kassens</name></author><author><name sortKey="Anisimov, Oleg A" sort="Anisimov, Oleg A" uniqKey="Anisimov O" first="Oleg A." last="Anisimov">Oleg A. Anisimov</name></author><author><name sortKey="Lavrov, Sergey A" sort="Lavrov, Sergey A" uniqKey="Lavrov S" first="Sergey A." last="Lavrov">Sergey A. Lavrov</name></author><author><name sortKey="Razumov, Sergey O" sort="Razumov, Sergey O" uniqKey="Razumov S" first="Sergey O." last="Razumov">Sergey O. Razumov</name></author><author><name sortKey="Grigoriev, Mikhail N" sort="Grigoriev, Mikhail N" uniqKey="Grigoriev M" first="Mikhail N." last="Grigoriev">Mikhail N. Grigoriev</name></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:6CCE6A8D59F66CA128E4A47D3AED97DF222CA716</idno><date when="2011" year="2011">2011</date><idno type="doi">10.1029/2011JC007218</idno><idno type="url">https://api-v5.istex.fr/document/6CCE6A8D59F66CA128E4A47D3AED97DF222CA716/fulltext/pdf</idno><idno type="wicri:Area/Istex/Corpus">002677</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Corpus" wicri:corpus="ISTEX">002677</idno><idno type="wicri:Area/Istex/Curation">002677</idno><idno type="wicri:Area/Istex/Checkpoint">000389</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Checkpoint">000389</idno><idno type="wicri:doubleKey">0148-0227:2011:Dmitrenko I:recent:changes:in</idno><idno type="wicri:Area/Main/Merge">001882</idno><idno type="wicri:Area/Main/Curation">001804</idno><idno type="wicri:Area/Main/Exploration">001804</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a" type="main" xml:lang="en">Recent changes in shelf hydrography in the Siberian Arctic: Potential for subsea permafrost instability</title><author><name sortKey="Dmitrenko, Igor A" sort="Dmitrenko, Igor A" uniqKey="Dmitrenko I" first="Igor A." last="Dmitrenko">Igor A. Dmitrenko</name><affiliation wicri:level="3"><country xml:lang="fr">Allemagne</country><wicri:regionArea>Leibniz Institute of Marine Sciences, University of Kiel, Kiel</wicri:regionArea><placeName><region type="land" nuts="2">Schleswig-Holstein</region><settlement type="city">Kiel</settlement></placeName></affiliation><affiliation wicri:level="1"><country wicri:rule="url">Allemagne</country></affiliation></author><author><name sortKey="Kirillov, Sergey A" sort="Kirillov, Sergey A" uniqKey="Kirillov S" first="Sergey A." last="Kirillov">Sergey A. Kirillov</name><affiliation wicri:level="1"><country xml:lang="fr">Russie</country><wicri:regionArea>Arctic and Antarctic Research Institute, St. Petersburg</wicri:regionArea><wicri:noRegion>St. Petersburg</wicri:noRegion></affiliation></author><author><name sortKey="Tremblay, L Bruno" sort="Tremblay, L Bruno" uniqKey="Tremblay L" first="L. Bruno" last="Tremblay">L. Bruno Tremblay</name><affiliation wicri:level="4"><country xml:lang="fr">Canada</country><wicri:regionArea>Department of Atmospheric and Oceanic Sciences, McGill University, Montreal, Quebec</wicri:regionArea><orgName type="university">Université McGill</orgName><placeName><settlement type="city">Montréal</settlement><region type="state">Québec</region></placeName></affiliation></author><author><name sortKey="Kassens, Heidemarie" sort="Kassens, Heidemarie" uniqKey="Kassens H" first="Heidemarie" last="Kassens">Heidemarie Kassens</name><affiliation wicri:level="3"><country xml:lang="fr">Allemagne</country><wicri:regionArea>Leibniz Institute of Marine Sciences, University of Kiel, Kiel</wicri:regionArea><placeName><region type="land" nuts="2">Schleswig-Holstein</region><settlement type="city">Kiel</settlement></placeName></affiliation></author><author><name sortKey="Anisimov, Oleg A" sort="Anisimov, Oleg A" uniqKey="Anisimov O" first="Oleg A." last="Anisimov">Oleg A. Anisimov</name><affiliation wicri:level="1"><country xml:lang="fr">Russie</country><wicri:regionArea>Department of Climate Change Research, State Hydrological Institute, St. Petersburg</wicri:regionArea><wicri:noRegion>St. Petersburg</wicri:noRegion></affiliation></author><author><name sortKey="Lavrov, Sergey A" sort="Lavrov, Sergey A" uniqKey="Lavrov S" first="Sergey A." last="Lavrov">Sergey A. Lavrov</name><affiliation wicri:level="1"><country xml:lang="fr">Russie</country><wicri:regionArea>Department of Climate Change Research, State Hydrological Institute, St. Petersburg</wicri:regionArea><wicri:noRegion>St. Petersburg</wicri:noRegion></affiliation></author><author><name sortKey="Razumov, Sergey O" sort="Razumov, Sergey O" uniqKey="Razumov S" first="Sergey O." last="Razumov">Sergey O. Razumov</name><affiliation wicri:level="1"><country xml:lang="fr">Russie</country><wicri:regionArea>Melnikov Permafrost Institute, Siberian Branch of the Russian Academy of Science, Yakutsk</wicri:regionArea><wicri:noRegion>Yakutsk</wicri:noRegion></affiliation></author><author><name sortKey="Grigoriev, Mikhail N" sort="Grigoriev, Mikhail N" uniqKey="Grigoriev M" first="Mikhail N." last="Grigoriev">Mikhail N. Grigoriev</name><affiliation wicri:level="1"><country xml:lang="fr">Russie</country><wicri:regionArea>Melnikov Permafrost Institute, Siberian Branch of the Russian Academy of Science, Yakutsk</wicri:regionArea><wicri:noRegion>Yakutsk</wicri:noRegion></affiliation></author></analytic><monogr></monogr><series><title level="j">Journal of Geophysical Research: Oceans</title><title level="j" type="abbrev">J. Geophys. Res.</title><idno type="ISSN">0148-0227</idno><idno type="eISSN">2156-2202</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><date type="published" when="2011-10">2011-10</date><biblScope unit="volume">116</biblScope><biblScope unit="issue">C10</biblScope><biblScope unit="page" from="/">n/a</biblScope><biblScope unit="page" to="/">n/a</biblScope></imprint><idno type="ISSN">0148-0227</idno></series><idno type="istex">6CCE6A8D59F66CA128E4A47D3AED97DF222CA716</idno><idno type="DOI">10.1029/2011JC007218</idno><idno type="ArticleID">2011JC007218</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0148-0227</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract">Summer hydrographic data (1920–2009) show a dramatic warming of the bottom water layer over the eastern Siberian shelf coastal zone (<10 m depth), since the mid‐1980s, by 2.1°C. We attribute this warming to changes in the Arctic atmosphere. The enhanced summer cyclonicity results in warmer air temperatures and a reduction in ice extent, mainly through thermodynamic melting. This leads to a lengthening of the summer open‐water season and to more solar heating of the water column. The permafrost modeling indicates, however, that a significant change in the permafrost depth lags behind the imposed changes in surface temperature, and after 25 years of summer seafloor warming (as observed from 1985 to 2009), the upper boundary of permafrost deepens only by ∼1 m. Thus, the observed increase in temperature does not lead to a destabilization of methane‐bearing subsea permafrost or to an increase in methane emission. The CH4 supersaturation, recently reported from the eastern Siberian shelf, is believed to be the result of the degradation of subsea permafrost that is due to the long‐lasting warming initiated by permafrost submergence about 8000 years ago rather than from those triggered by recent Arctic climate changes. A significant degradation of subsea permafrost is expected to be detectable at the beginning of the next millennium. Until that time, the simulated permafrost table shows a deepening down to ∼70 m below the seafloor that is considered to be important for the stability of the subsea permafrost and the permafrost‐related gas hydrate stability zone.</div></front></TEI><affiliations><list><country><li>Allemagne</li><li>Canada</li><li>Russie</li></country><region><li>Québec</li><li>Schleswig-Holstein</li></region><settlement><li>Kiel</li><li>Montréal</li></settlement><orgName><li>Université McGill</li></orgName></list><tree><country name="Allemagne"><region name="Schleswig-Holstein"><name sortKey="Dmitrenko, Igor A" sort="Dmitrenko, Igor A" uniqKey="Dmitrenko I" first="Igor A." last="Dmitrenko">Igor A. Dmitrenko</name></region><name sortKey="Dmitrenko, Igor A" sort="Dmitrenko, Igor A" uniqKey="Dmitrenko I" first="Igor A." last="Dmitrenko">Igor A. Dmitrenko</name><name sortKey="Kassens, Heidemarie" sort="Kassens, Heidemarie" uniqKey="Kassens H" first="Heidemarie" last="Kassens">Heidemarie Kassens</name></country><country name="Russie"><noRegion><name sortKey="Kirillov, Sergey A" sort="Kirillov, Sergey A" uniqKey="Kirillov S" first="Sergey A." last="Kirillov">Sergey A. Kirillov</name></noRegion><name sortKey="Anisimov, Oleg A" sort="Anisimov, Oleg A" uniqKey="Anisimov O" first="Oleg A." last="Anisimov">Oleg A. Anisimov</name><name sortKey="Grigoriev, Mikhail N" sort="Grigoriev, Mikhail N" uniqKey="Grigoriev M" first="Mikhail N." last="Grigoriev">Mikhail N. Grigoriev</name><name sortKey="Lavrov, Sergey A" sort="Lavrov, Sergey A" uniqKey="Lavrov S" first="Sergey A." last="Lavrov">Sergey A. Lavrov</name><name sortKey="Razumov, Sergey O" sort="Razumov, Sergey O" uniqKey="Razumov S" first="Sergey O." last="Razumov">Sergey O. Razumov</name></country><country name="Canada"><region name="Québec"><name sortKey="Tremblay, L Bruno" sort="Tremblay, L Bruno" uniqKey="Tremblay L" first="L. Bruno" last="Tremblay">L. Bruno Tremblay</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
EXPLOR_STEP=$WICRI_ROOT/Wicri/Canada/explor/ParkinsonCanadaV1/Data/Main/Exploration
HfdSelect -h $EXPLOR_STEP/biblio.hfd -nk 001804 | SxmlIndent | more
Ou
HfdSelect -h $EXPLOR_AREA/Data/Main/Exploration/biblio.hfd -nk 001804 | SxmlIndent | more
Pour mettre un lien sur cette page dans le réseau Wicri
{{Explor lien
|wiki= Wicri/Canada
|area= ParkinsonCanadaV1
|flux= Main
|étape= Exploration
|type= RBID
|clé= ISTEX:6CCE6A8D59F66CA128E4A47D3AED97DF222CA716
|texte= Recent changes in shelf hydrography in the Siberian Arctic: Potential for subsea permafrost instability
}}
| This area was generated with Dilib version V0.6.29. |  |