Most deserts are located in subtropical high pressure areas. How will the climate be affected?
This depends on the location. In high school geography, it is emphasized that 20 to 30 degrees north and south latitude is the distribution range of tropical desert climate, but this is only a rough range. The latitude position close to 30 degrees within this range is more emphasized. The subtropical high is controlled more by the trade winds on the side near 20 degrees. It doesn’t matter who controls it. The important thing is that the nature of the subtropical high and the trade winds are both dry, which leads to high temperatures, droughts, and The formation of drier rain characteristics is like whether it is a black cat (subtropical high) or a white cat (trade winds)
Pakistan is located on the western edge of the southwest monsoon belt, and is less affected by the monsoon. It is also affected by the subtropical high pressure Controlled, it is easy to form a tropical desert climate. Most areas in India are directly affected by the monsoon, which reduces the influence of the subtropical high. Since the southwest monsoon is basically eastward (affected by the geostrophic deflection force), the South Asian subcontinent receives more precipitation as it moves eastward. For typical examples, refer to Bangladesh and Myanmar. In fact, the areas bordering western India and Pakistan also have a tropical desert climate.
1. It is located in the control area of the subtropical high pressure zone, where dry and hot downdrafts prevail.
2. In terms of location, it is close to Asia and controlled by the northeast trade winds. The dry continental winds are not easy to form precipitation.
3. In terms of terrain, it has a large area, flat and open terrain, and a single climate, forming a large area of desert climate.
4. There is a cold current passing along the coast, which plays a role in cooling and dehumidifying the western coastal areas, and the desert is close to the edge.
5. The coastline is straight, and the Ethiopian Plateau on the east side blocks the warm and humid climate.
Digression: The main large deserts on the earth are all in the area controlled by the subtropical high pressure belt (referred to as the subtropical high). The subtropical high is dominated by downdrafts and is dry all year round. However, the circulation on the east and west sides of the subtropical high is a little different. The downdraft is strongest on the east side of the subtropical high, making the western part of the continent near the east side of the subtropical high prone to drought.
However, the downdraft on the west side of the subtropical high is not strong, and due to the monsoon, there may be sufficient precipitation throughout the year