Influence of the Indian ocean surface temperature anomalies on spatio-temporal variability of land surface air temperature 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

DOI: 10.33075/2220-5861-2024-4-07-15

UDC 551.513.7                                           

EDN: https://elibrary.ru/bmdudb

Abstract:     

The aim of this work is to study the atmospheric signal propagation excited by the Indian Ocean Dipole in the zonal and meridional directions. The response in the land surface air temperature (SAT) fields of the African-Eurasian region to sea surface temperature anomalies (SST) in the equatorial zone of the Indian Ocean is analyzed. ERA5 atmospheric reanalysis data on monthly mean SAT values, as well as the Dipole mode index for the period 1960–2023are used. It is shown that SST anomalies mainly affect SAT in the African-Eurasian region and the adjacent part of the Atlantic due to the variability of the anomaly field in the western Indian Ocean. Also notes the presence of the asynchronous connection between processes in the equatorial zone of the Atlantic and Indian Ocean. The correlation coefficients between SAT in the equatorial Atlantic region adjacent to the African continent and SST anomalies in the western part of the equatorial Indian Ocean reach very significant values (up to 0.95) in the winter and spring months. A significant non-stationarity of the analyzed time series, reflecting the non-stationarity of heat redistribution processes in the climate system is confirmed.

Keywords: Indian Ocean Dipole, surface air temperature anomalies, sea surface temperature anomalies, African-Eurasian region, tropical Atlantic.

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