What's the weather like in the area controlled by subtropical high?
In summer, controlled by subtropical high, the airflow sinks and there is little rain. In winter, the subtropical high moves to the low latitude, and the westerlies in this climate area have frequent cyclone activities and abundant precipitation. At the same time, the climate is mild and humid because the west wind blows from the warmer ocean in winter (the difference in thermal properties between land and ocean).
As for the subtropical high, the vertical motion of the atmosphere between the east and the west is quite different: in the east of the high, the sinking motion is particularly strong, and the downward airflow is warmed by adiabatic compression, resulting in a strong subsidence inversion, which is called trade wind inversion.
This strong inversion stratification is very stable (see the static atmosphere, which inhibits the development of vertical convection, makes the weather continue to be fine, and forms a dry climate zone on the west coast of the subtropical continent (see the Mediterranean (type) climate). In the west of high pressure, the downdraft and inversion layer are weak, which makes the warm and humid air converging and rising in the lower layer easily break through the inversion layer to form convection, so there are many thunderstorms.
Extended data
The subtropical high is distributed on the west coast of the mainland between 30 north latitude and 40 south latitude. It is also widely distributed, and it is the only climate type that exists in all continents except Antarctica. The eastern part of the subtropical high is a strong subsidence movement area, and the descending airflow becomes warmer due to adiabatic compression, and there will be continuous sunny and hot weather in the control area.
The western part of subtropical high is the convergence and rising area of low-level warm and humid air, which is prone to thunderstorm weather. With the change of seasons, the intensity and location of subtropical high will also change obviously between seasons.
From June 65438 to July, the main body of subtropical high moved to the north-west and its intensity increased. In July-65438+10, the main body of the subtropical high moved from south to east, and its intensity weakened. This seasonal change also has obvious stages of slow change and sudden change.
The subtropical high zone is located in the warm high pressure in the subtropical region. It is located near 30 degrees north and south latitude. This high-pressure belt is the dividing line between the prevailing westerly belt and the easterly belt, and the westerly belt is on the high latitude side.
Controlled by the subtropical high, the weather is clear, and its northwest side is the southwest airflow jump control area (over-rain area). The high pressure between tropical and temperate zones is called subtropical high, which is usually called the Pacific subtropical high that controls the Pacific region. It generally moves between10 ~ 40 N with seasonal changes.
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