Snow disaster damage in southern China in 2008 10

The 2008 Snow Disaster in Southern China refers to a wide range of natural disasters such as low temperatures, rain, snow, and freezing that have occurred in China since January 3, 2008. China's 20 provinces (autonomous regions and municipalities), including Shanghai, Jiangsu, Zhejiang, Anhui, Jiangxi, Henan, Hubei, Hunan, Guangdong, Guangxi, Chongqing, Sichuan, Guizhou, Yunnan, Shaanxi, Gansu, Qinghai, Ningxia and Xinjiang, have been affected by low temperature, rain and snow and freezing disasters to varying degrees. As of February 24, 129 people had died and 4 were missing, and 1.66 million people had been urgently relocated. The affected area of crops was 100 million mu, 87.64 million mu was damaged, and 25.36 million mu was lost; 10,000 houses collapsed and 10,000 houses damaged; The direct economic loss due to the disaster was 100 million yuan.

The forest area was damaged nearly 100 million mu, and 30,000 wild animals under national key protection froze to death or suffered frostbite in the snowstorm; More than 100 million people have been affected. Seven provinces, including Anhui, Jiangxi, Hubei, Hunan, Guangxi, Sichuan and Guizhou, were the most severely affected.

The first reason, the La Niña phenomenon, is that the sea surface temperature in the eastern equatorial Pacific Ocean is lower than normal and below the negative degree, and this phenomenon has a very obvious impact on China's climate.

The second reason is that there are two conditions that must be met for snow or rain: 1Warm and humid air currents from the tropics.

2.Cold air from alpine regions. Since 2008, the Asian high pressure has been very active, and the cold air mass has been formed to affect our country in the south, but because the warm air mass in the south is also active this year, the cold and warm are just combined.

Therefore, especially in the Yangtze River basin, there is a lot of rain and snow, and the weather is low for a long time. If there is only a strong cold air mass, and there is no large amount of water vapor provided by the warm and humid air mass, there will only be strong winds and cooling weather in the south; If there is only a large amount of water vapor provided by the warm and humid air mass, and no cold air mass is present, there is no catastrophic weather at all. And when both are in place, disaster strikes.

In addition, foreign experts say that it is related to the impoundment of the Three Gorges Dam, so let's verify it yourself.

2008 is the year of La Niña, and the 2008 snow disaster is not only caused by La Nina, but also caused by the combination of blocking high pressure, southern branch trough, and the location of the subtropical high.

As for flooding, last year's subtropical high did not bring the South China coast under control in time, and the trough of low pressure caused heavy rainfall, causing heavy rainfall and causing flooding.

Due to last year's La Niña phenomenon, the subtropical high was weak and northerly, resulting in last year's high temperature but did not last for a long time.

The reason for this year's drought is that La Niña will continue in the first half of 2009. As a result of La Niña, the subtropical high is weaker this winter, and the water vapor transport on the western side of the Pacific Ocean is weak. Although the temperature in the north is very low this year, the water vapor conditions are very poor, so the drought continues.

Now there is just no cold air affecting the south, the south is controlled by low pressure, and the temperature in the south will definitely drop in the future.

As for **, that's a normal release of energy.

Seven provinces, including Hunan, Hubei, Guizhou, Guangxi, Jiangxi, Anhui and Sichuan, were the most severely affected.

<>< the provinces most severely affected by the 2008 snowstorm are Hunan, Guizhou, Sichuan, Yunjumo, Lunan, Guangdong, Youhong and Anhui. Among them, Hunan Province has the largest area affected by the disaster, and Guizhou Province has the largest number of affected people.