Spatiotemporal variability of the flow in the deep part of the Central Caspian Sea

Abstract

The paper presents the analysis of hydrophysical observations executed along the Transcaspian section in 2004-2014 during the expeditions by Shirshov Institute of Oceanology of Russian Academy of Sciences. The results used in the paper are the generalization of data obtained in the last decade. Investigations of the current system of the Central Caspian Sea demonstrated that at the northeastern part of the cyclonic circulation there are considerable deviations. The deposits that energy of current disturbances of various spatiotemporal scales makes to the general energy of currents, are calculated. Preliminary results are received of the assessment of water transfer through the Apsheron threshold from the Central to the Southern Caspian Sea and vice versa. It is shown that annual recurrence of concentration of hydrogen sulfide in the benthonic hollows of the Caspian Sea is directly connected with seasonal and synoptic variability of currents at the bottom.