The global climate is getting warmer. Why is it getting colder in winter and hotter in summer?

Because of the influence of La Nina and El Nino.

La Nina means "La Nina" in Spanish? A "-"little girl, saint "means the reverse of El Ni? o phenomenon, also known as" anti-El Ni? o "or" cold event ". It refers to the abnormal drop of water temperature in the eastern Pacific near the equator, which is characterized by the obvious cooling of the eastern Pacific and the global climate chaos, and always appears after the El Ni? o phenomenon.

La Nina often appears alternately with El Nino, but the frequency is lower than El Nino. When La Ni? a phenomenon appears, Leng Xia fever is prone to occur in winter in China, and the number of tropical cyclones landing in China is more than normal, resulting in the phenomenon of "drought in the south and waterlogging in the north". Indonesia, eastern Australia, northeastern Brazil and other places have more rainfall; The equatorial regions of Africa and the southeastern United States are prone to drought.

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 phenomenon is an abnormal cooling of seawater in the central and eastern Pacific Ocean. The southeast wind blows the seawater heated by the sun to the western part of the Pacific Ocean, causing the sea level in the western part to rise by nearly 60 cm compared with that in the eastern part, the sea temperature in the western part to increase, the air pressure to decrease, the accumulation of wet air to form typhoons and tropical storms, and the bottom seawater in the eastern part to flow backward, resulting in the cooling of the sea water in the eastern part of the Pacific Ocean.

La Nina is the opposite of El Ni? o. With the disappearance of El Ni? o and the arrival of La Ni? a, the weather and climate disasters in many parts of the world will also change. Generally speaking, La Nina's temperament is not very mild, and the climate impact is roughly opposite to that of El Ni? o, and its intensity and impact are not as good as that of El Ni? o, but its arrival may also bring disasters to many parts of the world.

Extended data function:

1. La Nina phenomenon is marked by hurricanes, heavy rains and severe cold, which together with El Ni? o phenomenon will cause serious global climate anomalies.

2. La Nina usually appears after El Ni? o, and usually the two phenomena last for about one year each. However, the "La Nina" phenomenon, which started at 1998, lasted for two years and did not begin to weaken until June (2000).

3. La Nina and El Ni? o are natural phenomena, which occur in the Pacific Ocean, the Atlantic Ocean and the Indian Ocean, but they are diametrically opposite. El Nino refers to the abnormal continuous warming of tropical ocean temperature, while La Nina refers to the abnormal continuous cooling of tropical ocean temperature.

4. The cycle of El Nino is irregular, with an average of once every four years. La Nina will appear in the second year of El Nino, and sometimes it will last for two or three years.

5. The impact of La Nina phenomenon includes extreme drought in the southwest of the United States and the west coast of South America, unusually large amount of precipitation in southeast Asia such as Australia, Indonesia, Malaysia and the Philippines, and extreme cold in northeast Asia such as west and southeast coast of Africa, Japan and Korean Peninsula.

References:

Baidu Encyclopedia-La Nina

References:

Baidu Encyclopedia-El Nino Warm Current