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Climate Variations Diagnostics Group

This group studies the mechanisms of natural variability in the coupled atmosphere/ocean system over the Pacific and the surrounding regions, with various temporal and spatial scales, through analysis of observed data sets and output of ensemble hindcast experiments. In addition, we perform general circulation model experiments, for elucidating the mechanisms of fast atmospheric response to anomalies in mid- and high-latitude sea surface temperature (SST) and sea ice, and for studying behavior of meso-scale perturbations.@

The group has identified a particular type of decadal/interdecadal climate events (DICE), inherent to the mid-latitude Northern Pacific and accompanied by the anomalous Aleutian low. We are now studying various aspects of large-scale air/sea interaction processes that are involved in the variability. Our investigation extends into the Atlantic DICE and the possible remote influence of the interannual climate variability over the North Pacific (Aleutian-Icelandic low seesaw, the figure below), including climatic impact (temperature, precipitation, sea ice, etc.) over the entire extratropical Northern Hemisphere. Furthermore, we are also studying the variability of the Siberian high and associated modulations of the East Asian winter monsoon upon storm track activities over the Northwestern Pacific.

Figure: Schematics of formation of seesaw between the Aleutian low (AL) and Icelandic low (IL). The seesaw is triggered by a circulation anomaly over the North Pacific, and its influence then propagates into the North Atlantic in the form of stationary Rossby wave trains.