Climatic characteristics of tropical desert

Tropical desert has many climatic characteristics, such as sunny days, strong sunshine, dryness, hot summer, large temperature difference between day and night and many sandstorms.

The four seasons in the desert are also very different from other places at the same latitude. In the east of China, the spring and autumn seasons are very short because of the monsoon climate. But in desert areas, spring and autumn are shorter, because desert areas are too dry and there is no water regulation. The temperature rises in a straight line in spring and falls in autumn. The sum of spring and autumn is only about two and a half months to three months.

As soon as the spring and autumn seasons are short, the winter and summer seasons are exceptionally long. So some people describe it as: "In the arid areas of Central Asia, there are only two seasons in a year, Siberian winter and Sahara summer", which is somewhat reasonable. The temperature change of desert climate is the most extreme among all kinds of climate in the world. Specifically, the tropical desert climate zone is dry and hot all year round, especially in the hot season.

cause

Subtropical high is a kind of dynamic high, which is formed by the continuous accumulation of air flow over the equator over the subtropical zone, resulting in downward air flow, which leads to the increase of low-level air pressure. It is a warm and high pressure, and the main reason for the sunny and dry weather in the subtropical region is the prevalence of downward airflow.

Ocean currents have a great influence on the climate. Cold current can reduce the temperature and humidity of the area it flows through, while warm current can increase the temperature and humidity of the area it flows through. From the world climate and ocean current map, it can be seen that the west coast of the subtropical continent is affected by the cold current, so the precipitation is scarce and the climate is dry, while the east coast of the continent is affected by the warm current, so there is more precipitation. As for the formation of tropical desert climate in subtropical areas, it is not only affected by subtropical high or dry trade winds, but also related to being far away from the ocean and being less affected by the ocean.

Baidu Encyclopedia-Tropical Desert Climate