Characterizing Observed Midtopped Cloud Regimes Associated with Southern Ocean Shortwave Radiation Biases
Identifieur interne : 004329 ( Main/Merge ); précédent : 004328; suivant : 004330Characterizing Observed Midtopped Cloud Regimes Associated with Southern Ocean Shortwave Radiation Biases
Auteurs : Shannon Mason [Australie] ; Christian Jakob [Australie] ; Alain Protat [Australie] ; Julien Delanoë [France]Source :
- Journal of climate [ 0894-8755 ] ; 2014.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Océan Antarctique.
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- KwdEn :
Abstract
Clouds strongly affect the absorption and reflection of shortwave and longwave radiation in the atmosphere. A key bias in climate models is related to excess absorbed shortwave radiation in the high-latitude Southern Ocean. Model evaluation studies attribute these biases in part to midtopped clouds, and observations confirm significant midtopped clouds in the zone of interest. However, it is not yet clear what cloud properties can be attributed to the deficit in modeled clouds. Present approaches using observed cloud regimes do not sufficiently differentiate between potentially distinct types of midtopped clouds and their meteorological contexts. This study presents a refined set of midtopped cloud subregimes for the high-latitude Southern Ocean, which are distinct in their dynamical and thermodynamic background states. Active satellite observations from CloudSat and Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) are used to study the macrophysical structure and microphysical properties of the new cloud regimes. The subgrid-scale variability of cloud structure and microphysics is quantified within the cloud regimes by identifying representative physical cloud profiles at high resolution from the radar-lidar (DARDAR) cloud classification mask. The midtopped cloud subregimes distinguish between stratiform clouds under a high inversion and moderate subsidence; an optically thin cold-air advection cloud regime occurring under weak subsidence and including altostratus over low clouds; optically thick clouds with frequent deep structures under weak ascent and warm midlevel anomalies; and a midlevel convective cloud regime associated with strong ascent and warm advection. The new midtopped cloud regimes for the high-latitude Southern Ocean will provide a refined tool for model evaluation and the attribution of shortwave radiation biases to distinct cloud processes and properties.
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Victoria</wicri:noRegion></affiliation></author><author><name sortKey="Protat, Alain" sort="Protat, Alain" uniqKey="Protat A" first="Alain" last="Protat">Alain Protat</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Centre for Australian Weather and Climate Research, Bureau of Meteorology</s1><s2>Melbourne, Victoria</s2><s3>AUS</s3><sZ>3 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Melbourne, Victoria</wicri:noRegion></affiliation></author><author><name sortKey="Delanoe, Julien" sort="Delanoe, Julien" uniqKey="Delanoe J" first="Julien" last="Delanoë">Julien Delanoë</name><affiliation wicri:level="3"><inist:fA14 i1="03"><s1>Laboratoire Atmosphéres, Milieux, Observations Spatiales, UVSQ/IPSL/CNRS</s1><s2>Paris</s2><s3>FRA</s3><sZ>4 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region">Île-de-France</region><region type="old region">Île-de-France</region><settlement 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last="Mason">Shannon Mason</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Monash Weather and Climate, Monash University</s1><s2>Melbourne, Victoria</s2><s3>AUS</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Melbourne, Victoria</wicri:noRegion></affiliation></author><author><name sortKey="Jakob, Christian" sort="Jakob, Christian" uniqKey="Jakob C" first="Christian" last="Jakob">Christian Jakob</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Monash Weather and Climate, Monash University</s1><s2>Melbourne, Victoria</s2><s3>AUS</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Melbourne, Victoria</wicri:noRegion></affiliation></author><author><name sortKey="Protat, Alain" sort="Protat, Alain" uniqKey="Protat A" first="Alain" last="Protat">Alain Protat</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Centre for Australian Weather and Climate Research, Bureau of 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type="main">Journal of climate</title><title level="j" type="abbreviated">J. clim.</title><idno type="ISSN">0894-8755</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Antarctic Ocean</term><term>Bias</term><term>Climate models</term><term>Cloud physics</term><term>High latitude</term><term>Observation data</term><term>Polar region</term><term>Satellite observation</term><term>Space remote sensing</term><term>Subgrid scale method</term><term>high resolution</term><term>radiative transfer</term><term>solar radiation</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Haute latitude</term><term>Modèle climat</term><term>Erreur systématique</term><term>Transfert radiatif</term><term>Rayonnement solaire</term><term>Donnée observation</term><term>Physique nuage</term><term>Observation par satellite</term><term>Haute résolution</term><term>Méthode sous maille</term><term>Océan Antarctique</term><term>Zone polaire</term><term>Télédétection spatiale</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Océan Antarctique</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Clouds strongly affect the absorption and reflection of shortwave and longwave radiation in the atmosphere. A key bias in climate models is related to excess absorbed shortwave radiation in the high-latitude Southern Ocean. Model evaluation studies attribute these biases in part to midtopped clouds, and observations confirm significant midtopped clouds in the zone of interest. However, it is not yet clear what cloud properties can be attributed to the deficit in modeled clouds. Present approaches using observed cloud regimes do not sufficiently differentiate between potentially distinct types of midtopped clouds and their meteorological contexts. This study presents a refined set of midtopped cloud subregimes for the high-latitude Southern Ocean, which are distinct in their dynamical and thermodynamic background states. Active satellite observations from CloudSat and Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) are used to study the macrophysical structure and microphysical properties of the new cloud regimes. The subgrid-scale variability of cloud structure and microphysics is quantified within the cloud regimes by identifying representative physical cloud profiles at high resolution from the radar-lidar (DARDAR) cloud classification mask. The midtopped cloud subregimes distinguish between stratiform clouds under a high inversion and moderate subsidence; an optically thin cold-air advection cloud regime occurring under weak subsidence and including altostratus over low clouds; optically thick clouds with frequent deep structures under weak ascent and warm midlevel anomalies; and a midlevel convective cloud regime associated with strong ascent and warm advection. The new midtopped cloud regimes for the high-latitude Southern Ocean will provide a refined tool for model evaluation and the attribution of shortwave radiation biases to distinct cloud processes and properties.</div></front></TEI><affiliations><list><country><li>Australie</li><li>France</li></country><region><li>Île-de-France</li></region><settlement><li>Paris</li></settlement></list><tree><country name="Australie"><noRegion><name sortKey="Mason, Shannon" sort="Mason, Shannon" uniqKey="Mason S" first="Shannon" last="Mason">Shannon Mason</name></noRegion><name sortKey="Jakob, Christian" sort="Jakob, Christian" uniqKey="Jakob C" first="Christian" last="Jakob">Christian Jakob</name><name sortKey="Protat, Alain" sort="Protat, Alain" uniqKey="Protat A" first="Alain" last="Protat">Alain Protat</name></country><country name="France"><region name="Île-de-France"><name sortKey="Delanoe, Julien" sort="Delanoe, Julien" uniqKey="Delanoe J" first="Julien" last="Delanoë">Julien Delanoë</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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