In the Northern Hemisphere, the warm season is mostly formed in the Arctic, and the cold season is mostly formed in Siberia and Canada.The polar anticyclone only appears in the lower troposphere, and its vertical thickness can only reach the middle troposphere.According to the static relationship, its strength decreases with height, and turns into a polar cyclone above the middle troposphere.
Chinese name
Polar anticyclone
Foreign name
polar anticyclone
Alias
Polar high pressure
Causes
Long term radiation cooling of polar underground cushion
Polar anticyclone is also called polar high pressure.A cold high that moves slowly in the polar region and its vicinity.It is formed by long-term radiation cooling of the polar underground cushion.In the Northern Hemisphere, the warm season is mostly formed in the Arctic, and the cold season is mostly formed in Siberia and Canada.The polar anticyclone only appears in the lower troposphere, and its vertical thickness can only reach the middle troposphere.According to the static relationship, its strength decreases with height, and turns into a polar cyclone above the middle troposphere.[1]
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The air flow diffuses from the pole to the surrounding areas, expands in winter and shrinks in summer. The edge part intersects with the westerlies, with frontal and cyclonic activities, and the weather inside is single.
The downdraft at the center of the anticyclone is not conducive to the formation of clouds and rain.Therefore, the weather under the control of an anticyclone is generally sunny and cloudless.In summer, the weather is hot and dry.
The surface temperature under the polar high pressure is the lowest in the world. The average monthly temperature throughout the year is below the freezing point, and there is not much precipitation, forming a cold desert. The polar high pressure only appears in the lower troposphere, and its vertical thickness can only reach the middle of the troposphere. According to the static relationship, its strength decreases with height, and turns into a polar cyclone above the middle of the troposphere.In the Northern Hemisphere, the polar high pressure is mostly formed in the Arctic in the warm season and in Siberia and Canada in the cold season. The Siberian high pressure, located in the center of the large-scale high pressure (cyclone) in Siberia and Mongolia in winter, is a typical continental air mass. Due to the different thermal properties of land and sea, the continental cooling is fast and the marine cooling is slow.
Asia is the largest continent in the world, with obvious continental climate. The east of Asia is close to the Pacific Ocean, and the air flow flows from the Pacific Ocean to Eurasia, forming a high pressure area in Siberia.Siberian highIt is one of the four major seasonal atmospheric activity centers in the Northern Hemisphere. Its existence strongly affects the eastern region of Asia, making the winter in this region colder than that in the same latitude.The North American High is a seasonal atmospheric activity center that appears in winter and disappears in summer on the North American continent.Because the temperature of the mainland is lower than that of the ocean at the same latitude in winter, a cold high is formed on the mainland. The strength of the North American high is weaker than that of the Asian high, and the central pressure value is about 1027hPa. The weather under its control is sunny and cold in winter. When the strong high goes south, a cold wave in the United States is formed. Its center is located in Canada and the northwest of the United States, so it is also called the Canadian high.[2]
