Influence of anomalies in the surface temperature of the Indian Ocean on spatio-temporal variability of zonal component of the wind velocity in the African-Eurasian region and the adjacent part of the Atlantic

by

A.V. Torbinsky, A.B. Polonsky, A.V. Gubarev

Institute of Natural and Technical Systems, RF, Sevastopol, Lenin St., 28

E-mail: uzundja@mail.ru

DOI: 10.33075/2220-5861-2025-4-18-27

UDC 551.513.7                   

EDN: https://elibrary.ru/hvynol

Abstract:

The aim of this paper is to study the atmospheric signal propagation excited by the Indian Ocean Dipole in the zonal and meridional directions. The response in the zonal component of the wind velocity (U) of the African-Eurasian region to sea surface temperature anomalies (SST) in the equatorial zone of the Indian Ocean is analyzed. ERA5 atmospheric reanalysis on monthly mean U values, as well as the Dipole mode index for the period 1960–2023are used. It is shown that U anomalies mainly affect U in the African-Eurasian region and the adjacent Atlantic due to the variability of the anomaly field in the western Indian Ocean. The presence of the asynchronous connection between processes in the equatorial zone of the Atlantic and Indian Ocean is noted. The correlation coefficients between U in the equatorial Atlantic region adjacent to the African continent and SST anomalies in the western part of the equatorial zone of the Indian Ocean in the winter months can reach significant values. A significant nonstationarity of the analyzed time series, reflecting the nonstationarity of heat redistribution processes in the climate system is confirmed.

Keywords: Indian Ocean Dipole, zonal component of the wind velocity, sea surface temperature anomalies, African-Eurasian region, tropical Atlantic

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