65438+ February weather in Peru

The weather is so abnormal because of the El Nino phenomenon. El Nino is an abnormal climate phenomenon, which is caused by the sharp rise of water temperature near the equator of the Pacific Ocean. This phenomenon usually leads to drought in some areas and excessive rainfall in others. The United Nations Intergovernmental Panel on Climate Change pointed out that El Niñ o weather events are becoming more frequent and stronger. Peru is one of the largest fish producers in the world, and its fish meal production ranks first in the world. This is because in the coastal areas of Peru, in addition to the horizontal flow of water, there is an updraft rising from the bottom of the deep sea to the sea surface, which may lead to the ocean being rich in phosphate and other nutrients. Causing the water temperature in the coastal waters of Peru to rise. This phenomenon occurs around Christmas every few years, and so do local residents. The seasonal invasion of this warm current to the south leads to the increase of sea surface water temperature, which is called. El Nino? .

In normal years, the invasion range of El Nino can only reach a few degrees south latitude. In March next year, the sea surface water temperature will return to normal, with little impact. Fish and birds that have lived here for a long time. The conditions for the occurrence of El Nino phenomenon are different every year. In recent years, the invasion distance of warm water is getting farther and farther, and sometimes it is getting closer. When relatively hot water invades, it can reach south latitude 12 degrees. At this time, the water temperature in the coastal areas of Peru will rise rapidly. Plankton and some fish adapted to the cold water environment in this area will be greatly affected by environmental mutation. At the same time, due to the lack of food, some seabirds that feed on fish will also die in large numbers.

El Nino phenomenon, also known as El Nino flow, is a climatic phenomenon caused by the imbalance between the ocean and the atmosphere in the equatorial Pacific. 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. But this one is every 2? Once every seven years, it is disturbed, reversing the wind direction and ocean current, and 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? El Nino phenomenon? .

La Nina refers to the reversal of El Nino. 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 low SST, not the opposition of cold and warm nature. Generally speaking, La Nina's influence and destructive power are not as serious as El Niñ o's. It has not been studied as much as El Nino. La Nina often happens after El Nino, but it doesn't always happen. It takes about four years for El Nino and La Nina to transform into each other.

Chinese oceanographers believe that the catastrophic floods in China in the last century were caused by? El Nino? La Nina phenomenon? 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. The task of flood control, drought relief and disaster relief is very arduous.