Features of spring (April-June) cyclonic activity over the Asia-Pacific Region and its influence on the thermal regime of the Far Eastern Seas and parts of the Pacific Ocean in 1995-2018

Abstract

The features of spring cyclonic activity in certain areas of the Asia-Pacific region (Japan, Okhotsk, Bering Seas, Kuril region, northern and northwestern regions of the Pacific Ocean) are considered. It was shown that during the observation period (1995-2018) long-term fluctuations in the number and intensity of surface cyclones in the selected areas most often occurred independently of each other, and both parameters changed, mainly in antiphase (with an increase in the number of cyclones, their intensity weakened, and vice versa). It is noted that at the turn of 2000/2010 in the all areas the number of cyclones simultaneously decreased, and their intensity increased (in the Sea of Okhotsk, the Sea of Japan and the Kuril region - to maximum values).Subsequently (during the 2010s), the consistency in the course of both parameters in all areas was preserved. The relationship between the intensity of cyclones and surface temperature is revealed, and in the Okhotsk and Bering Seas, the Kuril region and in the north of the Pacific Ocean, the connection sign is positive, in the Sea of Japan and NWTO it is negative. In the mid-2010s in the Okhotsk, Bering and Japanese Seas, a violation of the revealed patterns was noted, which could be caused by large-scale processes in the atmosphere.