How to treat the dusty weather in Beijing and why is it formed?

1. In short, the formation of sandstorms requires the necessary conditions: sufficient sand sources, atmospheric stratification conditions for lifting dust into the air, and strong wind systems for transporting dust to distant places. On the other hand, due to the strong cyclone in Mongolia, gusts of 6-8 occurred from northern Xinjiang to central and western Gansu, most of Inner Mongolia and northern North China, which provided very good thermal and dynamic conditions for this dusty weather. It can be said that this event is a small probability event, which has both the conditions of dust and the conditions of spread. ?

The study on the driving forces behind sandstorms shows that Mongolia is experiencing a vicious cycle of high temperature, heat wave and drought under the background of climate change. The record high temperature and drought in the past two decades are unprecedented in more than 250 years. Another study on grassland ecosystem shows that Mongolia's grassland ecosystem has experienced rapid warming and decreased precipitation, and the frequency of drought has increased. Degraded vegetation and warm and dry climate make soil desertification and form potential sand sources.

Secondly, it can be said that Mongolia has long been the biggest source of sandstorms in North Asia, but there has always been sand and no wind, plus the north of China.

All kinds of windbreak and sand-fixing shelterbelts have never been ravaged, but their potential dangers were discovered in Gansu and Inner Mongolia several years ago.

Researchers in this area have noticed that the above data in this article are all attributed to these figures.

As they expected, this time, the huge confrontation between two cold and warm air masses over Mongolia almost created a "land platform"

The wind ",almost touched the peak of the troposphere.

Directly bypass all the shelterbelts in China and let 5% people in China recall the "Xiongnu"

South "scene, Beijingers should now understand where Chen Ziang's real feeling of" being on the Youzhou Tower "is, before me, the past era? .

Behind me, where is the next generation? "

Facts have proved that Mobei Mongolia has always hated the Central Plains. Even if people don't hate you, they naturally hate you and naturally hate you.

It's also because of the behavior of people there. I'm not optimistic about this so-called "* * * Qi Xin cooperation", and I believe people in Mongolia will not be optimistic, because this Ulyasutai area is right.

The former central government was very vigilant, and reclamation and mining were all due to this insecurity, that is, this sandstorm.

In the final analysis, it comes from distrust of neighboring countries in the south. How is it possible to accept the help of sand control from neighboring countries in the south? If it succeeds in the end,

Bring in the southern neighbors, so this sandstorm is not for nothing?

3. Since the disintegration of the Soviet Union, the ecological environment in Wuliutai region has deteriorated year by year, with the temperature rising, precipitation decreasing and desertification intensifying, which is largely caused by human factors. Since the 1990s, the former Urtai area has implemented the model of "the grassland belongs to the people of the whole country" and "the choice of grassland and residence is freely decided by everyone", resulting in all people crowding into areas with abundant water and grass to graze. 198 There were only 9 million sheep in China, but in 2009 it has become more than 6.5438+0.9 million, which is completely unbalanced, resulting in the degradation of a large number of grasslands in the south and becoming the source of sandstorms. ?

Then, in order to prevent agriculture from being strangled by only two neighboring countries, Mongolia reclaimed a lot of land and pumped lakes for irrigation. Coupled with the development of mining industry, another pillar of its economy, it has basically caused a devastating blow to the water resources in southern Mongolia. The average annual flow of the Tulu River has decreased by one third, and several lakes with particularly difficult names in the south have basically dried up. The number of roads in Mongolia exceeds the necessary value by 4 times, resulting in 7× 105km? Land degradation and denudation, this road is completely different from the road with street trees in China. ?

Four, 60 years, the number of dust days in China is only 18 days, and this figure

In 2007, the number of Chinese characters tripled to 57 days. Not only Mongolia, but also parts of Inner Mongolia. In the past 6 1 year, the average temperature in the whole region increased by 0.36 every ten years.

The Fahrenheit temperature is obviously higher than the global (rising by 0. 12 degrees Celsius every 10 year) and national (rising by 0.23 degrees Celsius every 10 year) warming range in the same period.

It is characterized by the increase of extreme high temperature events, the increase of precipitation fluctuation, the intensification of interannual fluctuation of climate drought days and the decrease of total water resources. temperature

With the increase of precipitation, the climate in Inner Mongolia becomes warmer and drier. As the main source of sand in China, although the northwest region

However, there is a warm and humid trend, but due to the uneven distribution of precipitation in time and space, drought still occurs in some areas in winter and spring, which is easy to cause spring dust.

Phenomenon. ?

The unusually rapid warming in the sand source area not only aggravated the local drought. Abnormal local warming can easily lead to local thermal instability.

, developed into a vertical circulation, causing the consequences of sand blowing. In the context of global warming, extreme weather, including strong winds, occurs frequently.

Frequent and frequent trends.

Why afforestation is not everything?

Windbreak forest is mainly near-surface vegetation, and the height is usually about 20-30 meters. Its function is to fix sand and store water through the roots of vegetation.

It is still possible to restrain and improve local sand blowing conditions and reduce sand blowing near the ground, and it is still possible to desert and Gobi that are not suitable for afforestation.

Become the sand source of sandstorm. The sand blowing height of strong sandstorms can reach1000-3000m, so windbreaks can stop sandstorms.

Fruit is not strong.

5. As a carbon sink resource, the advantages of vegetation in absorbing and storing carbon dioxide are constantly mentioned. But the carbon absorption potential of "carbon sink" is certain.

Conditions will be weakened, but it can also become a "carbon source", such as Inner Mongolia. When the drought degree exceeds a certain level in spring and summer, it will play a role.

The grassland ecosystem with carbon fixation will release more carbon dioxide back into the atmosphere. Similarly, it is called the lung of the earth.

The Amazon rainforest has become a huge carbon source under the increasingly frequent burning of mountain fires, further aggravating the greenhouse effect.

At the same time, we can't ignore that desert is an important part of the earth's natural environment and a complex ecosystem. place

Combating desertification is not to "destroy" the desert, but to scientifically manage human beings on the premise of respecting nature and adapting to local conditions.

It causes desertified land.

If we ignore the uniqueness of natural ecology and blindly promote greening, the effect of sand control will get twice the result with half the effort. For example, no

Taking full account of the climatic characteristics of low precipitation in desert areas, blind afforestation will not only make it difficult for trees to survive, but also further aggravate the shortage of water resources.

Situation.

It is human instinct to find simple answers, but the influencing factors of an environmental event in reality are complex. Problems and problems of sandstorm

Climate (and its changes), meteorological conditions, vegetation conditions, then the solution to it must not be single. Sandstorms force different countries.

Home, people from different regions, are all exposed to the same pollutants; Let us realize that people live in nature after all, not next to nature; that

Sandstorms should also promote systematic thinking and cooperative thinking.