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| Titel |
Drifter-derived estimates of lateral eddy diffusivity in the World Ocean with emphases on the Indian Ocean and problems of parameterization |
| VerfasserIn |
Victor Zhurbas, Dmitry Lyzhkov, Natalia Kuzmina, Mikhail Pyzhevich |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250071787
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| Zusammenfassung |
| The Global Drifter Program data set collected in the period of 1977-2010 is applied to
develop 2Ë Ã2Ë bin estimates of lateral eddy diffusivity K in the mixed layer of the World
Ocean by means of a modification of the Davis (1987,1991) approach. The analysis is
geographically focused on the Indian Ocean, the region where such calculations
have been lacking. Since the Indian Ocean circulation is strongly determined by
monsoonal winds, an effort was made to calculate K relative to monsoon-driven
mean currents. In highly energetic near surface currents of the World Ocean at mid
and high latitudes, the estimates of K are shown to follow the frozen field regime
parameterization K ~-EKE– -
Lbc, where EKE is the eddy kinetic energy, and Lbc
is the baroclinic Rossby deformation radius. On the contrary, in the tropical and
equatorial zones the fixed float regime parameterization, K = EKE -
T0, where
T0 = const is the typical value of the Lagrangian integral timescale, is preferable. |
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