The largest rain and snow since the Tiger year is online! From the 5th to the 7th, heavy snowstorms will occur in the Sichuan area of Yunnan, Yunnan, tibet, and parts of the Shaanxi-Gansu-Ningxia and Yangtze River basins.
In fact, before the Spring Festival of the Year of the Tiger, Nanjing had predicted that there would be blizzards, and as a result, snowflakes only existed at higher altitudes, and no snow had formed in the urban area, and many citizens regretted it. In the process of this round of rain and snow, it is predicted that there may be blizzards in Nanjing, not only that, but southern cities such as Shanghai, Hangzhou and Wuhan may also have large blizzards, and people living here can look forward to it.
Causes of rain and snow formation
The main reason for the formation of this round of rain and snow is the confluence of cold and warm air, of which cold air mainly comes from the polar regions, and in the winter of the Northern Hemisphere, the Arctic is in an extremely night state, and the cold air shrinks and sinks, forming a cold high pressure. Under the action of various factors such as the rotation of the earth and the terrain, cold air may go south, of which 95% of the cold air affecting the continent will develop in the key area of the Siberian cold wave, continue to develop and then go south into the continent, resulting in a large-scale cooling process on the continent.
On the other hand, the formation of the south branch will continuously transport warm and humid air flow from the ocean to the mainland, and these water vapors are the raw materials for rain and snow weather, and when they collide with cold air, they will form rain and snow weather.
Affected by the eastward movement of high-altitude and low troughs and the cold air of the ground going south, in this round of rain and snow weather, the range of rain and snow on the mainland gradually moves from the southwest to the central and eastern regions, of which the main precipitation time period is concentrated on the 6th to 8th, the snowfall can reach 5-10 mm, and the snowfall in the local area can reach 10-20 mm.
Many people may think that the precipitation of 10-20 mm is not high, and the impact on humans is not large. In fact, if the rainfall is only 10-20 mm, then the impact on humans is indeed not too large, but if it is snowfall, the impact on humans is larger.
The first is because snow is solid, not flowing as quickly as running water into the underground passage, but is deposited on the ground, on the roof, and on the branches. Among them, the snowfall of 10 mm corresponds to the depth of snow is 7.5 cm (under the same amount of snowfall, the thickness of the snow in the south is thinner, and the thickness of the snow in the north is thicker), the amount of snow 7.5 cm may hinder traffic, and after the snow melts, if the local ground temperature is lower than 0 ° C, the melted water will condense into ice, which is extremely easy to cause traffic accidents.
Secondly, snow is heavy, 7.5 cm thick snow may crush vegetable greenhouses, as well as dangerous houses, dangerous buildings, need people to be prepared in advance for disaster prevention and mitigation.
Will wildlife be affected?
Compared with humans, wild animals cannot predict weather changes in advance, and it is difficult to prepare for disaster prevention and mitigation, so will wild animals be affected in the process of rain and snow?
In fact, although snow will affect the survival of wild animals, as long as it is not particularly thick snow, and the enduring "winter snow", the impact on wild animals is relatively small.
In this round of snowfall, Shaanxi, Gansu and the Yangtze River Basin and other southern cities of the snowfall is not extreme, the maximum snowfall is between 10-20 mm, the corresponding snow depth is between 7.5-15 cm, such a thick snow although it will affect human traffic safety, as well as damage to human infrastructure, but the impact on wild animals is relatively small, and will not hinder their daily foraging.
Furthermore, the healthier the ecological chain, the less impact on wildlife. For example, silly roe deer are very susceptible to snow disasters, they have poor feeding ability, and when the snow covers the surface vegetation, they are easy to die because they can't find food. However, wild boars have a strong ability to arch snow, followed by sheep and cattle, and the open space after they planing can provide a feeding ground for roe deer, making them less vulnerable.
In addition, the temperature in shaanxi, Gansu, Ningxia and the Yangtze River basin where snowfall occurs is not low, or even high, which will also cause the snow to melt on the ground, or melt in just a few days, with little impact on the local area.
In fact, the blizzard will not cause disaster to the vast majority of animals, a few of the potential for disaster is a variety of snakes, snakes belong to thermostatic organisms, in the low temperature environment their biological enzyme catalytic efficiency becomes low, the body will become stiff and unable to move, so the temperature will be below 15 ° C to find a place to hibernate.
If the temperature below the ground is low enough and lasts long enough, some of the shallower snakes in the dormant site will suffer or even freeze to death. For example, in the course of the snow disaster in the south in 2008, it led to a large number of deaths of the rare snake Mangshan soldering iron head on the mainland. However, the intensity of this round of rain and snow weather is far less than that of the 2008 southern snow disaster, which has less impact on wild animals and will not cause a large number of wild animals to be affected.
The only concern is that parts of Tibet suffer from heavy snowfall, of which the nela wood snow depth of 66 cm, because the snow is deep enough, coupled with the local growth of low meadow vegetation, a large amount of vegetation will be covered under the snow, making it difficult for wild herbivores to feed, some individuals who do not store enough fat in the summer and autumn may freeze to death and starve to death because it is difficult to eat for a long time.
However, the Neram region is also the deepest snowy area on the mainland, and perhaps the wildlife here has adapted to the living environment here and migrated to other places to overwinter before heavy snowfall comes.