What effect does El Nino have on the climate in China? Why?

First of all, whether it is true or not, scientists in China believe that the impact of El Ni? o on China is obvious and complicated, mainly in five aspects: First, the main rain belt of El Ni? o in summer is in the south, and most areas in the north are rainy and dry; Second, the rainy season in the middle and lower reaches of the Yangtze River is mostly postponed; Third, the precipitation in the east of China is more in the south and less in the north in autumn, which is easy to make the north dry in summer and autumn; Fourth, most parts of the country are warm in winter and cool in summer; Fifth, there are fewer typhoons landing in China. In addition to the above general rules, there are some exceptions. Because there are many factors that restrict China's weather and climate, such as atmospheric circulation, monsoon changes, land thermal conditions, Arctic ice and snow distribution, ocean current changes and even solar activities. El Nino phenomenon, also known as El Nino flow, is a climatic phenomenon caused by the eastward shift of Walker circulation circle, which leads to the imbalance between the ocean and the atmosphere in the Pacific equatorial belt. 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". As for the cause of El Nino, it is a mystery of contemporary science. Most scientists believe that there are two major aspects: one is natural factors. Equatorial trade winds, earth rotation, geothermal movement, etc. It may all be related to it; The second is human factors. That is, human activities have aggravated climate warming, which is one of the possible reasons for the sharp increase of equatorial warming events.