The weather in Guangdong is dry.

From the statistical synthesis results of La Nina events, it can also be seen that the southeast coast is prone to winter drought. It was not until the southwest monsoon of the South China Sea broke out at the turn of spring and summer that the situation of less precipitation could be alleviated. Most of the water vapor in southern China comes from the southwest warm and humid airflow (Bay of Bengal warm and humid airflow). Before the south branch westerly winds moved south to the Bay of Bengal, the southern part of China (Yunnan, South China and other places) was dominated by dry and warm climate. In recent years, the time for the south branch westerly wind to move southward is getting later and later, so the water vapor brought from the Bay of Bengal is getting less and less. Another reason is that the arctic vortex is weak this year, and there are many cold currents in the south, which suppressed the water vapor in the north South China Sea, so the drought in Guangdong and Fujian has been particularly obvious in recent years.

Climate anomaly is the direct cause of drought disaster, but its harm degree is also related to socio-economic conditions. For example, abnormal atmospheric circulation, a region controlled by high pressure for a long time, is the meteorological cause of drought; Topography also plays an important role in the formation of drought disasters. For example, the warm and humid air flow in summer is affected by mountains, which can make the precipitation on the leeward side of mountains obviously less and prone to drought disasters; Soil vegetation status and water conservancy facilities are also closely related to the occurrence of drought; The soil with deep soil layer and fine texture has strong water retention and storage capacity, and the drought disaster is light. On the contrary. It's heavier; Human activities also have a certain impact on the occurrence of drought disasters, such as deforestation, which leads to the deterioration of agricultural ecology and the increase of the probability of dry years. As far as the impact on agricultural production in Guangdong is concerned, there are mainly two kinds of drought: spring drought, autumn drought, summer drought and winter drought, but the duration of summer drought is generally short and the scope is small; It is normal to have less rain in winter, and planting in winter is mostly dry, which requires less water and is more drought-tolerant.

First of all, from the perspective of physical geography, it is not only the drought in Guangdong, but also many southern provinces (such as Fujian and Zhejiang) are relatively dry this spring.

The reason is that, controlled by the subtropical high pressure belt, the intensity of cold air in the south is weak and the intensity of warm air is strong this year, resulting in less precipitation than in previous years.

However, for the eastern part of China, as a humid and semi-humid area, the causes of drought and even drought disasters are more human factors.

The population density in the east of China is high, and the water consumption is much higher than that in the west. As a populous province and an economically developed region, Guangdong has a large water consumption and a small per capita water consumption.