Open AccessLONG-TERM VARIABILITY OF THE HYDRO-METEOROLOGICAL PARAMETS IN THE CASPIAN SEA. PART 2: ANALYSIS
Author(s) -
A. S. Kazmin
Publication year - 2020
Publication title -
okeanologičeskie issledovaniâ
Language(s) - English
Resource type - Journals
eISSN - 2587-9634
pISSN - 1564-2291
DOI - 10.29006/1564-2291.jor-2020.48(2).1
Subject(s) - climatology , advection , environmental science , relative humidity , precipitation , humidity , wind speed , structural basin , hydrometeorology , lag , atmospheric sciences , global warming , climate change , geography , meteorology , oceanography , geology , paleontology , computer network , physics , computer science , thermodynamics
The second part of the paper presents a phenomenological analysis of the relationships of long-term variability of various hydrometeorological parameters in the Caspian Sea in the period 1948–2017. It is shown that under annual averaging the North-Eastern wind regime prevails over the sea basin, but the major portion of heat advection into the region is provided by zonal (Eastern) transport. Periods of warming/cooling are associated with a weakening/ strengthening of the Eastern transport. The time lag between the change of dynamic and thermal (as well as humidity) regimes is about 10–12 years. Specific humidity is positively correlated with air temperature and decreases/increases during periods of cooling/warming. In contrast, relative humidity and precipitation rates are negatively correlated with air temperature. Periods of intensification of Eastern transport (and, consequently, cooling) over the Caspian Sea coincide with a situation when the NAO index decreases to negative or zero values, and the EAWR index is significantly positive. Easing of the Eastern transport (and warming) occurs during a period of sharp strengthening of the NAO at strongly negative values of the EAWR index.