The main characteristics of the general atmospheric circulation of the Northern Hemisphere in summer 2024(from June to August)are as follows.The polar vortex is characterized by a unipolar pattern with its center biased towards the Western Hemisphere and its intensity equivalent to the historical average.The circulation in the middle and high latitudes presents a 4-wave pattern.The cold air affecting China is weaker than usual.The subtropical high is much west extended and stronger than usual,and the number of typhoons is 3.1 less than the historical average.There are 9 gale processes above Beaufort wind force scale 8,including 4 processes produced by offshore extratropical cyclones and 5 processes produced by typhoons.The long duration of gale is caused by the slow moving of Typhoon Gaemi and Shanshan.Obvious sea fog processes occur 7 times,including 4 in June and three in July.There are 12 rough sea wave processes with the wave height above 2.0 m in offshore areas of China,and the three large wave processes with the highest wave height above 4.0 m are related to typhoon activities.Sea surface temperatures are gradually rising.There are 15 tropical cyclones in other ocean basins,including one in the northern Indian Ocean and the central North Pacific,respectively,8 in the eastern North Pacific and 5 in the North Atlantic.
国家科技期刊平台
NSTL
万方数据
维普
