Response in surface air temperature fields of Europe to the Indian ocean dipole

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

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


DOI: 10.33075/2220-5861-2022-4-6-14

UDC 551.513.7                                                 


   The aim of this work is to study the influence of the Indian Ocean Dipole (IOD) events, which are independent of El Niño-Southern Oscillation (ENSO) on spatiotemporal variability of surface air temperature (SAT) in the European region.

   ERA5 atmospheric reanalysis data on monthly mean air surface temperature values, as well as IOD and ENSO indices for the period 1959–2020, were used. For years during which there were no significant pacific events, years were identified in which the value of the IOD index exceeded 0.4σ. For the samples corresponding to the positive and negative phases of IOD, the SAT anomaly fields averaged and the composite were constructed.

   A statistically significant signal was identified in the field of surface air temperature over the European region in the summer-autumn period, associated with IOD. It has been found that during the development of the positive phase of intense IOD events, extensive positive temperature anomalies over Europe reach + (3–4) ℃. On the contrary, in the negative phase of IOD, an increase in the absolute value of negative SAT anomalies (up to -(4–5) ℃) is observed over the most part of the European region. The exception is the northern part of Europe, where anomalies of the opposite (in relation to the rest of the region) sign were noted during both phases of the IOD. The influence of IOD on the climatic variability of the region under study, most likely, comes down to the excitation of atmospheric disturbances over the Indian Ocean during the period of the mature phase of the oscillation, and their subsequent spread to the Atlantic-European region.

Keywords: Indian Ocean dipole, El Niño-Southern Oscillation, surface air temperature, European region.

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