D Mansoury; M Sadrinasab; M Akbarinasab
Abstract
Seasonal and annual variability in circulation of surface waters of the Caspian Sea were studied using POM model. In this model, temperature and salinity field’s data and wind field and the flow of atmospheric data were collected from WOA and daily data bank ECMWF, respectively, with an resolution ...
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Seasonal and annual variability in circulation of surface waters of the Caspian Sea were studied using POM model. In this model, temperature and salinity field’s data and wind field and the flow of atmospheric data were collected from WOA and daily data bank ECMWF, respectively, with an resolution of 5.7 minutes and the time step of 6 hours and for Bathymetry from GEBCO08 data with an resolution of 30 seconds is used. Initially, the model for ten years (1988-1997) was carried out and, after examining the stability of the model with measurement data available (1996) were compared, that good agreement between their temperature and salinity changes observed. Then, for the last ten years (2005-2014) in two cases (with and without taking into account the flows of atmospheric wind field data and rivers) model was implemented. The results showed that changes in water flow in all seasons, in shallow areas, wind field indicates the dominant effect on the region, but in deep, wind has less effect on the flow. Changes in mean annual surface water circulation of the Caspian Sea show three of the water circulation. A relatively weak clockwise circulation is in the northern basin and a counterclockwise circulation great stronger (gyre) in the center of the middle basin and a relatively small strong clockwise circulation in South of the southern basin due to their seasonal circulations, wind force in the northern basin and shallow areas the Caspian Sea are more effective in the formation of water flows.