INFLUENCE OF INTERANNUAL ANOMALIES OF SEA SURFACE TEMPERATURE ON VARIABILITY OF ATMOSPHERIC CIRCULATION. RESULTS OF NUMERICAL EXPERIMENTS

K. G. Rubinshtein and E. N. Egorova

The paper presents the results of two ten-year (1979–1988) numerical experiments with the general circulation model of the atmosphere developed at the Hydrometeorological Center of Russia. In Experiment 1 the sea surface temperature (SST) was specified as the mean monthly values obtained from observation data. In Experiment 2 it was obtained through a month-by-month averaging of the Experiment 1 data for ten years. It is shown that in numerical experiments with realistic interannual SST variability the anomalies of mean monthly temperature and humidity in the free atmosphere of the tropical Pacific was reproduced quite satisfactorily. Analysis of surface temperature and precipitation anomalies averaged over the European Russia has shown that the precipitation anomalies in the experiments are comparable with those obtained in the reanalysis: the temperature anomalies in the experiments were much smaller than in the reanalysis. The consideration of interannual SST variations slightly improves the reproduction of temperature and precipitation anomalies at middle latitudes.