LONG-TERM VARIABILITY OF THE HYDRO-METEOROLOGICAL PARAMETS IN THE CASPIAN SEA. PART 2: ANALYSIS

Authors

  • A. S. Kazmin Shirshov Institute of Oceanology, Russian Academy of Sciences

DOI:

https://doi.org/10.29006/1564-2291.JOR-2020.48(2).1

Keywords:

hydro-meteorological parameters, long-term variability, wind regime, air temperature, atmospheric humidity, Caspian Sea

Abstract

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.

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Published

2020-09-21

Issue

Vol. 48 No. 2 (2020): Journal of Oceanological Research

Section

Ocean physics and climate

License

Transfer of copyrights occurs on the basis of a license agreement between the Author and Shirshov Institute of Oceanology, RAS

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