The heavy snowfall and low temperatures in the Northern Hemisphere this year cast doubt on the global greenhouse effect.

Abnormal atmospheric circulation under the "La Nina" phenomenon is the "culprit" of snow disasters

"The direct cause of the recent large-scale heavy rain and snow weather is abnormal atmospheric circulation." Chief Forecaster of the Central Meteorological Observatory Member Sun Jun said.

He analyzed that from the perspective of the evolution of atmospheric circulation in the short and medium term, cold air has been more frequent since the beginning of winter this year, and warm and humid air currents have been active. Especially since January, the circulation in mid- and high-latitudes is mainly meridional, and cold air activities are frequent. In addition, the subtropical system is stronger and is located farther west and north than at the same time in normal years, which is conducive to transporting warm and moist air from the south to the north. On the one hand, the cold air in the north is very active, and on the other hand, the warm and humid air currents in the south are continuously transported northward. The intersection of warm and cold air currents is mainly located in the central and eastern regions of my country, creating favorable circulation conditions for large-scale rain and snow weather.

This year’s atmospheric circulation anomalies are related to the “La Ni?a event” occurring in the equatorial central-eastern Pacific. Li Weijing, deputy director of the National Climate Center, said that from the perspective of climate change, the current low temperature in the equatorial central and eastern Pacific Ocean is one of the manifestations of the "La Ni?a" phenomenon. Statistical analysis shows that in the winter of the strong La Ni?a event and the spring of the following year, the meridionality of the mid-latitude atmospheric circulation may be strengthened, that is, cold air activities are frequent, which can easily cause low temperatures in most areas of northern and eastern my country, and areas north of the Yangtze River. Precipitation is on the high side.

Why does the heavy snow refuse to “retreat” this year? Experts attribute the reason to the stability of atmospheric circulation. Sun Jun said: "It is precisely because the atmospheric circulation is stable and less changeable during this period, and the southwest warm and humid air flow and cold air have continued around 30 degrees north latitude, especially concentrated in the middle and lower reaches of the Yangtze River, that rain and snow will not appear obvious in the near future. Turn.

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It is indeed the result of abnormal atmospheric circulation under the “La Ni?a” phenomenon...

But I personally think there is a secondary condition...

Nowadays, because our country is developing rapidly, our country’s development is inseparable from industry. The CO2 emitted by industry ranks second only after the United States. Therefore, in the summer, the temperature in our country is too high. Even after entering winter, the sun is still very hot. This leads to a large amount of water evaporation. Due to the hot weather, a large amount of water is stored in the Three Gorges area of ????my country, resulting in a large amount of water vapor over the Three Gorges falling rapidly. New water vapor has been added since then, so there is still a lot of water vapor in the air all the way into winter.

Since our country is a coastal country, there is a summer monsoon in summer and a winter monsoon in winter. In summer, it blows from the Australian monsoon area and summer monsoon area on the sea to Siberia on the Asian continent. In winter, it is just the opposite. A large amount of water vapor lingering in the Three Gorges area is caused by the atmospheric circulation under the winter monsoon and "La Ni?a" phenomenon. Under the action of abnormal synchronization, a large amount of water vapor condensed into crystals while moving southward. At this time, a large amount of water turned into rain and a large amount of ice (including snow) fell in the south.

The large amount of water stored in the Three Gorges Dam has caused a lot of water vapor to linger in the air... and the "La Ni?a" phenomenon together led to this heavy snow...