 |
| Titel |
Seasonal variability of the Caspian Sea three-dimensional circulation, sea level and air-sea interaction |
| VerfasserIn |
R. A. Ibrayev, E. Özsoy, C. Schrum, H. İ. Sur |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1812-0784
|
| Digitales Dokument |
URL |
| Erschienen |
In: Ocean Science ; 6, no. 1 ; Nr. 6, no. 1 (2010-03-03), S.311-329 |
| Datensatznummer |
250003362
|
| Publikation (Nr.) |
 copernicus.org/os-6-311-2010.pdf |
|
|
|
|
|
| Zusammenfassung |
| A three-dimensional primitive equation model including sea ice
thermodynamics and air-sea interaction is used to study seasonal circulation
and water mass variability in the Caspian Sea under the influence of
realistic mass, momentum and heat fluxes. River discharges, precipitation,
radiation and wind stress are seasonally specified in the model, based on
available data sets. The evaporation rate, sensible and latent heat fluxes
at the sea surface are computed interactively through an atmospheric
boundary layer sub-model, using the ECMWF-ERA15 re-analysis atmospheric data
and model generated sea surface temperature. The model successfully
simulates sea-level changes and baroclinic circulation/mixing features
with forcing specified for a selected year. The results suggest that the
seasonal cycle of wind stress is crucial in producing basin circulation.
Seasonal cycle of sea surface currents presents three types: cyclonic gyres
in December–January; Eckman south-, south-westward drift in February–July
embedded by western and eastern southward coastal currents and transition
type in August–November. Western and eastern northward sub-surface coastal
currents being a result of coastal local dynamics at the same time play an
important role in meridional redistribution of water masses. An important
part of the work is the simulation of sea surface topography, yielding
verifiable results in terms of sea level. The model successfully reproduces sea
level variability for four coastal points, where the observed data are
available. Analyses of heat and water budgets confirm climatologic estimates
of heat and moisture fluxes at the sea surface. Experiments performed with
variations in external forcing suggest a sensitive response of the
circulation and the water budget to atmospheric and river forcing. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|