What activity centers are there in the northern hemisphere, and what impact do these activities have on the weather and climate in China?

In summer, the atmospheric pressure centers in the northern hemisphere include Hawaiian high, azores high and Indian low (Asian low); Aleutian low, Icelandic low and Asian high (Mongolian Siberian high) in winter. These pressure centers have an impact on China's climate: Eurasia is controlled by the "Asian high" in winter, and China is dominated by the north, with a cold and dry climate, which is characterized by cold and dry northeast and warm and dry south China; In summer, there is an "Asian low" in the mainland and a Hawaiian high in the Pacific Ocean (the center that affects China's climate can be called a "subtropical high"), which jumps from south to north and then returns, making the rainy season in China different, from May to 10 in the southern coast, from June to September in the middle and lower reaches of the Yangtze River, and from July to August in the northeast and north China. In the middle and lower reaches of the Yangtze River, the rainy season is from mid-June to mid-July. From mid-July to mid-August, it was controlled by "subtropical high" and was hot and dry, so it was called "summer drought".

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