Warm high pressure mostly occurs in Subtropical zone Area, sometimes in Middle and high latitudes Regional occurrence. If the center is warmer than the surrounding high pressure ( Anticyclone )， system Profound, vertical The extension range is very large, sometimes it can be reached stratosphere The bottom mostly occurs in the upper air at mid and high latitudes, as well as in tropical and subtropical regions. [1] This kind of high pressure is stable and durable or relatively stable and durable. as Subtropical high It is a large and deep warm high-pressure system with stable and lasting characteristics; Another example is the blocking high, which is a warm high in the westerlies in the middle and upper troposphere, and its position is relatively stable, which can last about 8 days; The equatorial high is a warm high in the low atmosphere near the equator. Generally, in the central area of high pressure, the wind is weak, the weather is sunny, and the wind and rain mostly occur at the edge of high pressure. For example, in the control area of subtropical high in summer, the sun is scorching and the weather is extremely hot, while in the edge area, it may rain heavily. [1]
Take the subtropical high as an example. The western Pacific subtropical high is an oblique axis warm high. In the middle and lower troposphere, it is both a regional thermal center and a regional high pressure center. Its heat comes from Dry adiabatic process The starting pressure comes from the fact that the gas mass convergence is greater than the mass divergence, resulting in a net accumulation. The reason why it is such a feature from top to bottom is that the subtropical high is formed by dynamic action and is the result of atmospheric circulation, where the downdraft keeps flowing. [2]
