Scenario of Anomaly Development in the Ocean–Atmosphere System in the Indian and Pacific Ocean Tropics in El Nino Years

N. A. Vyazilova

A scenario is presented of the development of the anomalies of the ocean–atmosphere climate system in the tropics of the Indian and Pacific Oceans for dry and wet years that were characterized, respectively, in the 1950–1999 period by significant negative and positive anomalies of the summer rainfall over India and by the evolution of the warm and cold phases of the ENSO phenomenon. The scenario was obtained on the basis of analysis of the vertical and horizontal structure of the compositional anomalies of a whole series of parameters: the sea surface temperature, the dynamic characteristics of the circulation, the zonal and meridional transport in the troposphere, and also the outgoing long-wave radiation at the upper limit of the atmosphere, as the basic criterion of the development of the convection. The results of the study confirm the role of large-scale circulation as the coupling agent, a sort of atmospheric “bridge”, between the anomalies in the Indian Ocean and the development of the ENSO in the Pacific Ocean.

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