 |
| Titel |
Modelling the Caspian Sea and its catchment area using a coupled regional atmosphere-ocean model (RegCM4-ROMS): model design and preliminary results |
| VerfasserIn |
U. U. Turuncoglu, G. Giuliani, N. Elguindi, F. Giorgi |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1991-959X
|
| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 6, no. 2 ; Nr. 6, no. 2 (2013-03-01), S.283-299 |
| Datensatznummer |
250017792
|
| Publikation (Nr.) |
 copernicus.org/gmd-6-283-2013.pdf |
|
|
|
|
|
| Zusammenfassung |
| We describe the development of a coupled regional atmosphere-ocean model
(RegCM4-ROMS) and its implementation over the Caspian Sea basin. The coupled
model is run for the period 1999–2008 (after a spin up of 4 yr) and it is
compared to corresponding stand alone model simulations and a simulation in
which a distributed 1d lake model is run for the Caspian Sea. All model
versions show a good performance in reproducing the climatology of the
Caspian Sea basin, with relatively minor differences across them. The coupled
ROMS produces realistic, although somewhat overestimated, Caspian Sea Surface
Temperature (SST), with a considerable improvement compared to the use of the
simpler coupled lake model. Simulated near surface salinity and sea currents
are also realistic, although the upwelling over the eastern coastal regions
is underestimated. The sea ice extent over the shallow northern shelf of the
Caspian Sea and its seasonal evolution are well reproduced, however, a
significant negative bias in sea-ice fraction exists due to the relatively
poor representation of the bathymetry. ROMS also calculates the Caspian Sea
Level (CSL), showing that for the present experiment excessive evaporation
over the lake area leads to a drift in estimated CSL. Despite this problem,
which requires further analysis due to many uncertainties in the estimation
of CSL, overall the coupled RegCM4-ROMS system shows encouraging results in
reproducing both the climatology of the region and the basic characteristics
of the Caspian Sea. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|