High temperature and lack of rain caused drought in many parts of the country. Why is the climate so abnormal this year?

High temperature and lack of rain caused drought in many parts of the country. Moderate to severe droughts occurred in Northeast China, Huanghuai, Jianghuai, Southwest China, and eastern Inner Mongolia, southwestern Shanxi, eastern Shaanxi, northern Hubei, and western Guangxi. Severe drought occurred in northeastern Jilin and southern Yunnan. The average precipitation in Northeast China is 42.5 mm, that in Jilin Province is 4 1.4 mm, that in Liaoning Province is 43.7 mm, and that in Heilongjiang Province is 42.2 mm, which is 38.2% less than the same period of last year, the seventh least since 196 1 year.

The cold air in China is weak, and the frequency is not much. Even if there is warm and humid airflow and no cold air, it is not easy to snow. The Asian high is very active, and the cold air mass continues to form southward, affecting China and causing large-scale gale and cooling weather. However, due to the active air mass in the south this year, a large number of warm and humid air from the Pacific Ocean and the Indian Ocean frequently visited the south. When a strong cold air mass from Mongolia and Siberia quickly went south and met a warm wet air mass, the cold and warm air just merged into one.

Affected by these two air currents, there have been more rainy and snowy weather recently, especially in the Yangtze River basin, and the low temperature weather has lasted for a long time. If there is only a strong cold air mass and there is no large amount of water vapor provided by warm and humid air mass, there will only be strong winds and cool weather in the south; If only the warm wet air mass provides a large amount of water vapor, and there is no cold air mass, there will be no catastrophic weather at all. And when two people are ready, disaster comes. Global warming makes the climate more unstable, and extreme cold and warm events are frequent and increasing in intensity or have become the norm. In particular, large-scale extreme weather events have had a serious impact on life and production, so we should attach great importance to it and strengthen prevention and response.