The weather is abnormal and disastrous.

El Nino phenomenon, also known as El Nino current, is a climatic phenomenon caused by the imbalance between the ocean and the atmosphere in the equatorial Pacific. Under normal circumstances, the monsoon currents in the tropical Pacific Ocean move from America to Asia, keeping the surface of the Pacific Ocean warm and bringing tropical rainfall around Indonesia. However, this pattern is disrupted every 2-7 years, and the wind direction and ocean currents are reversed. The heat flow in the surface layer of the Pacific Ocean turns eastward to America, and then takes away tropical rainfall, resulting in the so-called "tropical rainfall".

La Nina (la

Nina) refers to the inversion of El Nino phenomenon, that is, the SST in the equatorial eastern Pacific is lower than normal. This is originally the active area of the ocean cold current. Compared with normal years, it is only the difference of sea surface temperature, not the opposition of cold and warm nature. Generally speaking, La Nina's influence and destructive power are not as serious as El Ni? o's, and its research is not as much as El Ni? o's. La Nina often happens after El Nino, but not always. It takes about four years for El Nino and La Nina to transform into each other.

Chinese oceanographers believe that the catastrophic flood disaster in China in 1998 was caused by the El Ni? o-La Ni? a phenomenon and the ecological deterioration in the Yangtze River basin.

The climate in some parts of China is abnormal. This year, the climate in some parts of China is abnormal, and uncertainties are increasing. The situation of drought and water shortage is quite severe, and there is a great possibility of major floods in some river basins, so the task of flood control and drought relief is very heavy.