Traditional Culture Encyclopedia - Weather forecast - Why is there so much disaster weather in China this year? (Answer with geographical knowledge)

Why is there so much disaster weather in China this year? (Answer with geographical knowledge)

There is an El Nino phenomenon this year. El Nino (also known as El Nino current) is a climatic phenomenon caused by the imbalance between the ocean and the atmosphere in the equatorial belt of the Pacific Ocean, and it is caused by the eastward movement of Walker circulation circle. Under normal circumstances, the monsoon air flow in the tropical Pacific moves from America to Asia, keeping the surface of the Pacific Ocean warm and bringing tropical rainfall around Indonesia. However, this pattern is disturbed every 2-7 years, and the wind direction and ocean current are reversed. The heat flow in the surface of the Pacific Ocean turns eastward to America, and then takes away tropical rainfall, resulting in the so-called "El Ni? o phenomenon". The impact on China is:

1) Typhoon reduction. The number of tropical storms (typhoons) in the western Pacific and the number of coastal landings in China are less than normal. (2) The summer monsoon is weak, and the monsoon rain belt is southerly, which is located in the middle of China or in the south of the Yangtze River. The northern region is prone to drought and high temperature in summer, while the southern region is prone to low temperature and flood. In the past century, serious floods in China, such as 193 1, 1954, 1998 in the middle and lower reaches of the Yangtze River, all occurred one year after the El Ni? o phenomenon.

(3) In the winter after El Ni? o, the northern part of China is prone to warm winters.