Why does the warm winter El Nino phenomenon form and what does it mean?

There are many reasons for warm winter, which are often the result of a combination of many reasons. The reasons for the warm winter are as follows:

1, China is in a warm period.

The temperature changes periodically. According to the statistics of meteorological data in the last hundred years, there is a cold and warm cycle in China for about 30 years. It was cold before the 1920s, warm in the 1920s and 1940s, cold in the 1950s and 1970s, and turned into a warm period after the 1980s. At present, China is still in this warm period.

Warm winter weather occurs in northwest, north and northeast China, and the periodicity of these areas is more obvious.

2. Greenhouse effect

Since the industrialization of the last century, due to the influence of human activities, the content of greenhouse gases such as carbon dioxide in the atmosphere has increased rapidly, leading to a significant increase in global temperature. The continuous warm winter in China is happening against the background of global warming. China is located at the southern tip of the warmer East Siberia, and the warmer climate in China is an integral part of global warming.

El Nino warm current is an abnormal natural phenomenon in the Pacific Ocean, and it is a famous Peruvian cold current flowing from south to north on the west coast of South America and the eastern part of the South Pacific. From June 165438+ 10 to March of the following year, it is summer in the southern hemisphere. The water temperature in the southern hemisphere generally rises and the equatorial warm current flows westward.

At this time, the global pressure belt and wind belt move south, and the northeast trade wind crosses the equator and deflects to the left into the northwest monsoon under the action of the southern hemisphere self-deflection force (also known as geostrophic deflection force). The northwest monsoon not only weakens the southeast trade wind, which is near the west coast of Peru, but also weakens or even disappears the cold water flooding of Peru's cold current. It also blows the equatorial warm current with higher water temperature to the south, which makes the water temperature of Peru's cold current abnormally rise. This quiet and unstable ocean current is called "El Nino Warm Current".

El Nino is divided into El Nino phenomenon and El Nino event. El Nino is a climatic phenomenon of abnormal warming of sea surface temperature in tropical Pacific Ocean. Large-scale warming in the tropical Pacific will cause global climate change, but it will take more than three months to determine whether the El Ni? o event really happens. After El Nino, La Nina sometimes follows.

However, according to the satellite images released by the National Aeronautics and Space Administration (NASA) on February 27, 20 15, the El Ni? o phenomenon in the Pacific shows no signs of abating. Experts predict that 20 16 may become the most destructive year of El Ni? o.