The weather is abnormal this year. What is the reason?

Because it .. La Nina refers to the phenomenon that the sea surface temperature in the eastern and central equatorial Pacific Ocean continues to be abnormally cold (just the opposite of El Ni? o phenomenon). This is a new term used in meteorology and oceanography. It means "little girl", just the opposite of El Nino, which means "El Nino". It is also called "anti-El Nino" or "cold event". El Nino and La Nina are abnormal manifestations of alternating sea surface temperature in the equatorial, Middle East and Pacific Ocean, forming a cycle. La Nina phenomenon after El Nino is not uncommon. Similarly, La Nina will be followed by El Nino. However, according to the records since 1950, the frequency of El Nino is higher than that of La Nina. Under the background of global warming, the frequency and intensity of La Nina phenomenon are slowing down. Especially in the 1990s, there were three consecutive El Ni? os from 199 1 to 1995, but there was no La Ni? a in the middle. La Nina (La Nina? A) Interpretation La Nina is Spanish "La Nina? A "(note that it is not La Nina)-"Little girl, Saint "is the antonym of El Ni? o, which means that the water temperature in the eastern Pacific Ocean near the equator drops abnormally, which is manifested by the obvious cooling in the eastern Pacific Ocean, accompanied by global climate chaos, and always appears after El Ni? o. Meteorologists and oceanographers use it to refer to the phenomenon that the seawater in the eastern and central equatorial Pacific Ocean continues to drop abnormally in a large range (the surface temperature of seawater is lower than the climate average by more than 0.5℃ and lasts for more than 6 months). La Nina is also known as the anti-El Nino phenomenon. El Nino and La Nina are abnormal manifestations of alternating sea surface temperature in the equatorial, Middle East and Pacific Ocean, forming a cycle. La Nina phenomenon after El Nino is not uncommon. Similarly, La Nina will be followed by El Nino. However, according to the records since 1950, the frequency of El Nino is higher than that of La Nina. Under the background of global warming, the frequency and intensity of La Nina phenomenon are slowing down. Especially in the 1990s, there were three consecutive El Ni? os from 199 1 to 1995, but there was no La Ni? a in the middle. La Nina usually follows the El Ni? o phenomenon. La Nina will appear in the second year of El Ni? o, sometimes lasting for two or three years. During the period of 1988 ~ 1989, 1998 ~200 1 year, a strong La Nina phenomenon occurred, which made the seawater temperature in the eastern and central Pacific Ocean lower than normal 1 ~ 2℃ and1995. Some scientists believe that La Nina tends to weaken due to the trend of global warming. The last La Nina phenomenon appeared in 1998 and lasted until the spring of 2000. El Nino and La Nina usually appear alternately, which have roughly opposite impacts on the climate. Through the energy exchange between the ocean and the atmosphere, the atmospheric circulation is changed, thus affecting climate change. According to the monitoring data in recent 50 years, the frequency and intensity of El Nino are more than La Nina. 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 flood disaster in China in 1998 was caused by "El Nino-La Nina phenomenon" and ecological deterioration in the Yangtze River basin. Oceanographers and meteorologists in China have noticed that last year's El Ni? o phenomenon (ocean warming) in the tropical Pacific turned into La Ni? a phenomenon (seawater cooling) within one month. This unprecedented situation is one of the reasons for the surge in rainfall in the Yangtze River basin. The El Nino phenomenon made the climate in China abnormal. 1998 from June to July, there was frequent rainfall in the south of the Yangtze River and South China, and serious floods occurred in the Yangtze River basin and the two lakes basin. The water level of some rivers has exceeded the warning water level for a long time, and the rainfall in parts of Guangdong, Guangxi and Yunnan is also above 50%. Waterlogging also occurs in parts of North China and Northeast China. La Nina can also cause climate anomalies. Chao Jiping, academician of the China Academy of Sciences and honorary director of the National Marine Environmental Forecasting Research Center, said that the current situation is that the influence of El Ni? o has not completely disappeared, but the influence of La Ni? a has started again, which makes the climate state of China extremely complicated. Generally speaking, after the large-scale warm and humid air caused by El Nino moves to the higher latitudes in the northern hemisphere, it meets the cold air in the north and exchanges cold and warm, resulting in an increase in rainfall. But after June, when summer comes and the rain belt moves northward, the flood season in the Yangtze River basin should be over. But then La Nina appeared, the air in the south became cold and sank, and the warm and humid airflow that had moved northward returned to fill the vacuum. In fact, the subtropical high reached 30 degrees north latitude at 10 in July, and suddenly retreated southward to 18 degrees north latitude. This phenomenon has never happened in history. La Nina is a modified transitional phenomenon after El Nino. This hydrological feature will cause the water temperature in the eastern Pacific to drop, which will lead to drought. On the contrary, the water temperature in the western Pacific will rise, and the precipitation will be significantly higher than normal. Scientists believe that La Nina, a hydrological phenomenon, will not have a significant impact on the world climate, but will bring more rainfall to Guangdong, Fujian, Zhejiang and even the entire southeast coast in a certain period of time. El Nino and La Nina stay away from the tropics a few days ago, NASA said that in the past three years, El Nino and La Nina have caused abnormal weather. They will no longer affect the tropics, but other regions will also be affected by them. The temperature and water level in tropical Atlantic and Pacific have returned to normal levels. The water level in the central Pacific Ocean is higher14 ~ 32cm than normal, and the water level in Bering Sea and gulf of alaska is 5 ~13cm lower than normal. William Patzelt, an oceanographer at the agency's Jet Propulsion Laboratory, said that the current calm began with the disappearance of La Nina three months ago. He believes that the global climate system has returned to the state of three years ago. La Nina is in decline. The following content was published in 2007, but the facts have overturned this theory. La Nina has not disappeared since the snowstorm in the south in early 2008. -2008.0 1 The latest ocean observation data sent back by Poseidon satellites in France and the United States show that La Nina phenomenon affecting the Pacific Ocean has obviously weakened in recent years, and the world's largest ocean will restore its former "tranquility". "La Nina" literally means "girl" and refers to a phenomenon of abnormal water temperature change in the eastern Pacific Ocean near the equator. La Nina phenomenon is formed after the huge cold water area caused by El Nino surfaced in the East Pacific Ocean. Because of its characteristics, it is also called "anti-El Nino" phenomenon. La Nina phenomenon is marked by hurricane, rainstorm and severe cold, which, together with El Ni? o phenomenon, will cause serious global climate anomalies. According to French experts, "La Nina" usually appears after "El Nino". Usually, these two phenomena each last for about a year. However, the "La Nina" phenomenon, which started in 1998, lasted for two years, and it didn't begin to weaken until June this year (2007). They said that the current research could not explain why the La Ni? a phenomenon and the previous El Ni? o phenomenon were extremely strong, nor could it explain why the La Ni? a phenomenon lasted for one year longer than before. Last year 1 month and June, researchers observed signs of "La Nina" weakening twice, but later results proved that these were just illusions. After a little breathing, "La Nina" made a comeback again. French experts stressed that the latest data sent back by this satellite shows that the phenomenon of "La Nina" has obviously weakened, and this time the "girl" is really old.