Ocean feedback to tropical cyclones: climatology and processes
Identifieur interne : 004035 ( Main/Exploration ); précédent : 004034; suivant : 004036Ocean feedback to tropical cyclones: climatology and processes
Auteurs : Swen Jullien [France] ; Patrick Marchesiello [France] ; Christophe E. Menkes [France] ; Jérôme Lefevre [France] ; Nicolas C. Jourdain [Australie, France] ; Guillaume Samson [France] ; Matthieu Lengaigne [France, Inde]Source :
- Climate dynamics [ 0930-7575 ] ; 2014.
Descripteurs français
- Pascal (Inist)
- Climatologie, Cyclone tropical, Cyclogenèse, Interaction atmosphère océan, Rétroaction, Simulation numérique, Echelon régional, Analyse sensibilité, Température surface marine, Intensification, Tourbillon anticyclonique, Tourbillon cyclonique, Dynamique océanique, Océan Pacifique Sud, Mer de Corail, Temps violent, Modèle couplé.
- Wicri :
- topic : Climatologie.
English descriptors
- KwdEn :
Abstract
This study presents the first multidecadal and coupled regional simulation of cyclonic activity in the South Pacific. The long-term integration of state-of the art models provides reliable statistics, missing in usual event studies, of air-sea coupling processes controlling tropical cyclone (TC) intensity. The coupling effect is analyzed through comparison of the coupled model with a companion forced experiment. Cyclogenesis patterns in the coupled model are closer to observations with reduced cyclogenesis in the Coral Sea. This provides novel evidence of air-sea coupling impacting not only intensity but also spatial cyclogenesis distribution. Storm-induced cooling and consequent negative feedback is stronger for regions of shallow mixed layers and thin or absent barrier layers as in the Coral Sea. The statistical effect of oceanic mesoscale eddies on TC intensity (crossing over them 20 % of the time) is also evidenced. Anticyclonic eddies provide an insulating effect againststorm-induced upwelling and mixing and appear to reduce sea surface temperature (SST) cooling. Cyclonic eddies on the contrary tend to promote strong cooling, particularly through storm-induced upwelling. Air-sea coupling is shown to have a significant role on the intensification process but the sensitivity of TCs to SST cooling is nonlinear and generally lower than predicted by thermodynamic theories: about 15 rather than over 30 hPa °C-1 and only for strong cooling. The reason is that the cooling effect is not instantaneous but accumulated over time within the TC inner-core. These results thus contradict the classical evaporation-wind feedback process as being essential to intensification and rather emphasize the role of macro-scale dynamics.
Affiliations:
- Australie, France, Inde
- Auvergne-Rhône-Alpes, Midi-Pyrénées, Nouvelle-Galles du Sud, Occitanie (région administrative), Rhône-Alpes, Île-de-France
- Grenoble, Paris, Sydney, Toulouse
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Le document en format XML
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Jourdain</name><affiliation wicri:level="3"><inist:fA14 i1="04"><s1>Climate Change Research Centre, University of New South Wales</s1><s2>Sydney</s2><s3>AUS</s3><sZ>5 aut.</sZ></inist:fA14><country>Australie</country><placeName><settlement type="city">Sydney</settlement><region type="état">Nouvelle-Galles du Sud</region></placeName></affiliation><affiliation wicri:level="3"><inist:fA14 i1="05"><s1>Laboratoire de Glaciologie et Géophysique de l'Environnement, Université de Grenoble / Centre National de la Recherche Scientifique</s1><s2>Grenoble</s2><s3>FRA</s3><sZ>5 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region">Auvergne-Rhône-Alpes</region><region type="old region">Rhône-Alpes</region><settlement type="city">Grenoble</settlement></placeName></affiliation></author><author><name sortKey="Samson, Guillaume" sort="Samson, Guillaume" uniqKey="Samson G" first="Guillaume" last="Samson">Guillaume Samson</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Laboratoire d'Etudes en Géophysique et Océanographie Spatiales, IRD/CNRS/University of Toulouse, 14 av. Edouard Belin</s1><s2>31400 Toulouse</s2><s3>FRA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>4 aut.</sZ><sZ>6 aut.</sZ></inist:fA14><country>France</country><wicri:noRegion>31400 Toulouse</wicri:noRegion><placeName><settlement type="city">Toulouse</settlement><region type="region" nuts="2">Occitanie (région administrative)</region><region type="old region" nuts="2">Midi-Pyrénées</region></placeName></affiliation></author><author><name sortKey="Lengaigne, Matthieu" sort="Lengaigne, Matthieu" uniqKey="Lengaigne M" first="Matthieu" last="Lengaigne">Matthieu Lengaigne</name><affiliation wicri:level="3"><inist:fA14 i1="02"><s1>Sorbonne Universités (UPMC, Univ Paris 06)-CNRS-IRD-MNHN, LOCEAN Laboratory, IPSL</s1><s2>Paris</s2><s3>FRA</s3><sZ>3 aut.</sZ><sZ>7 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region">Île-de-France</region><region type="old region">Île-de-France</region><settlement type="city">Paris</settlement></placeName></affiliation><affiliation wicri:level="1"><inist:fA14 i1="06"><s1>Indo-French Cell for Water Sciences, IISc-NIO-IITM-IRD Joint International Laboratory, NIO</s1><s2>Goa</s2><s3>IND</s3><sZ>7 aut.</sZ></inist:fA14><country>Inde</country><wicri:noRegion>Goa</wicri:noRegion></affiliation></author></analytic><series><title level="j" type="main">Climate dynamics</title><title level="j" type="abbreviated">Clim. dyn.</title><idno type="ISSN">0930-7575</idno><imprint><date when="2014">2014</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Climate dynamics</title><title level="j" type="abbreviated">Clim. dyn.</title><idno type="ISSN">0930-7575</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Anticyclonic eddy</term><term>Climatology</term><term>Coral Sea</term><term>Coupled model</term><term>Cyclogenesis</term><term>Cyclonic eddy</term><term>Intensification</term><term>Ocean dynamics</term><term>Regional scope</term><term>Sea surface temperature</term><term>Severe weather</term><term>South Pacific</term><term>Tropical cyclone</term><term>digital simulation</term><term>feedback</term><term>ocean-atmosphere interaction</term><term>sensitivity analysis</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Climatologie</term><term>Cyclone tropical</term><term>Cyclogenèse</term><term>Interaction atmosphère océan</term><term>Rétroaction</term><term>Simulation numérique</term><term>Echelon régional</term><term>Analyse sensibilité</term><term>Température surface marine</term><term>Intensification</term><term>Tourbillon anticyclonique</term><term>Tourbillon cyclonique</term><term>Dynamique océanique</term><term>Océan Pacifique Sud</term><term>Mer de Corail</term><term>Temps violent</term><term>Modèle couplé</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Climatologie</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">This study presents the first multidecadal and coupled regional simulation of cyclonic activity in the South Pacific. The long-term integration of state-of the art models provides reliable statistics, missing in usual event studies, of air-sea coupling processes controlling tropical cyclone (TC) intensity. The coupling effect is analyzed through comparison of the coupled model with a companion forced experiment. Cyclogenesis patterns in the coupled model are closer to observations with reduced cyclogenesis in the Coral Sea. This provides novel evidence of air-sea coupling impacting not only intensity but also spatial cyclogenesis distribution. Storm-induced cooling and consequent negative feedback is stronger for regions of shallow mixed layers and thin or absent barrier layers as in the Coral Sea. The statistical effect of oceanic mesoscale eddies on TC intensity (crossing over them 20 % of the time) is also evidenced. Anticyclonic eddies provide an insulating effect againststorm-induced upwelling and mixing and appear to reduce sea surface temperature (SST) cooling. Cyclonic eddies on the contrary tend to promote strong cooling, particularly through storm-induced upwelling. Air-sea coupling is shown to have a significant role on the intensification process but the sensitivity of TCs to SST cooling is nonlinear and generally lower than predicted by thermodynamic theories: about 15 rather than over 30 hPa °C<sup>-1</sup> and only for strong cooling. The reason is that the cooling effect is not instantaneous but accumulated over time within the TC inner-core. These results thus contradict the classical evaporation-wind feedback process as being essential to intensification and rather emphasize the role of macro-scale dynamics.</div></front></TEI><affiliations><list><country><li>Australie</li><li>France</li><li>Inde</li></country><region><li>Auvergne-Rhône-Alpes</li><li>Midi-Pyrénées</li><li>Nouvelle-Galles du Sud</li><li>Occitanie (région administrative)</li><li>Rhône-Alpes</li><li>Île-de-France</li></region><settlement><li>Grenoble</li><li>Paris</li><li>Sydney</li><li>Toulouse</li></settlement></list><tree><country name="France"><region name="Occitanie (région administrative)"><name sortKey="Jullien, Swen" sort="Jullien, Swen" uniqKey="Jullien S" first="Swen" last="Jullien">Swen Jullien</name></region><name sortKey="Jourdain, Nicolas C" sort="Jourdain, Nicolas C" uniqKey="Jourdain N" first="Nicolas C." last="Jourdain">Nicolas C. Jourdain</name><name sortKey="Lefevre, Jerome" sort="Lefevre, Jerome" uniqKey="Lefevre J" first="Jérôme" last="Lefevre">Jérôme Lefevre</name><name sortKey="Lengaigne, Matthieu" sort="Lengaigne, Matthieu" uniqKey="Lengaigne M" first="Matthieu" last="Lengaigne">Matthieu Lengaigne</name><name sortKey="Marchesiello, Patrick" sort="Marchesiello, Patrick" uniqKey="Marchesiello P" first="Patrick" last="Marchesiello">Patrick Marchesiello</name><name sortKey="Menkes, Christophe E" sort="Menkes, Christophe E" uniqKey="Menkes C" first="Christophe E." last="Menkes">Christophe E. Menkes</name><name sortKey="Samson, Guillaume" sort="Samson, Guillaume" uniqKey="Samson G" first="Guillaume" last="Samson">Guillaume Samson</name></country><country name="Australie"><region name="Nouvelle-Galles du Sud"><name sortKey="Jourdain, Nicolas C" sort="Jourdain, Nicolas C" uniqKey="Jourdain N" first="Nicolas C." last="Jourdain">Nicolas C. Jourdain</name></region></country><country name="Inde"><noRegion><name sortKey="Lengaigne, Matthieu" sort="Lengaigne, Matthieu" uniqKey="Lengaigne M" first="Matthieu" last="Lengaigne">Matthieu Lengaigne</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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