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| Titel |
Sea surface temperature as a proxy for convective gravity wave excitation: a study based on global gravity wave observations in the middle atmosphere |
| VerfasserIn |
J. Y. Jia, P. Preusse, M. Ern, H.-Y. Chun, J. C. Gille, S. D. Eckermann, M. Riese |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 32, no. 11 ; Nr. 32, no. 11 (2014-11-05), S.1373-1394 |
| Datensatznummer |
250121129
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| Publikation (Nr.) |
 copernicus.org/angeo-32-1373-2014.pdf |
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| Zusammenfassung |
| Absolute values of gravity wave momentum flux (GWMF) deduced from satellite
measurements by the Sounding of the Atmosphere using Broadband Emission
Radiometry (SABER) instrument and the High Resolution Dynamics Limb Sounder
(HIRDLS) are correlated with sea surface temperature (SST) with the aim of
identifying those oceanic regions for which convection is a major source of
gravity waves (GWs). Our study identifies those latitude bands where high
correlation coefficients indicate convective excitation with confidence. This
is based on a global ray-tracing simulation, which is used to delineate the
source and wind-filtering effects. Convective GWs are identified at the eastern coasts of the continents and over the warm water regions formed by the warm
ocean currents, in particular the Gulf Stream and the Kuroshio. Potential
contributions of tropical cyclones to the excitation of the GWs are
discussed. Convective excitation can be identified well into the mid-mesosphere. In propagating upward, the centers of GWMF formed by convection
shift poleward. Some indications of the main forcing regions are even shown
for the upper mesosphere/lower thermosphere (MLT). |
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