Where is the cause of the world s large scale snowfall, and where is the snowiest place in the world

Hong Kong, Feb. 3 (CNC) -- The snow disaster in southern China this winter is related to extreme weather caused by the La Niña phenomenon, and has nothing to do with climate change, Australian climatologists said.

Xinhua news agency reported that Chinese meteorological experts said that "La Niña" brought warm and humid air currents to the already cold southern regions, causing heavy snowfall. Penny Wheaton, an Australian climatologist, said China's interpretation of the blizzard was correct. Severe weather has nothing to do with climate change, she said.

In 2007, the United Nations Intergovernmental Panel on Climate Change (IPCC) published four climate change assessment reports in phases, and Wheaton wrote the chapter "Regional Climate" in the fourth report.

"This kind of weather is a natural phenomenon, and every few years, decades, when various factors accumulate to a certain extent, it causes extreme weather ......," Wheaton saidIn my opinion, this is a natural phenomenon and is not particularly related to climate change. ”

China's climate may not be as stable because of global warming, she said, and many regions are experiencing severe weather such as increased drought, increased rain, warmer temperatures or more frequent tropical storms. She predicts that the northern regions of China, where cold air is active, could see snowfall more intensively due to increased atmospheric humidity, just like the blizzard in the south now.

David Jones, director of climate analysis at the Australian Centre for Climate Research, said that unlike disasters caused by rising temperatures and increased precipitation, such as floods, high temperatures and fires, snow disasters in China are linked to extreme weather caused by the "La Niña" phenomenon. "In the Northern Hemisphere, there are often such extreme weather in winter, and it has always been and will continue to be," he said. ”

It's La Niña, which is caused by the drop of water on the west coast of the continent where Brazil is located near the equator, and it's a special weather phenomenon that is the opposite of El Niño, and it probably has nothing to do with global warming.

In the Yangtze River basin, snowfall is one of the most popular natural phenomena of people. Tohoku people love snow because it provides a good place for skiers, who ride their sleds across the white fields.

The snowiest place in the world for a year is Washington, the capital of the United States, with 1,870 mm of snowfall per year.

Generally, there are two conditions for snowfall, one is that the temperature must drop below zero degrees Celsius, and the other is that there must be sufficient moisture. Washington is not far from the Atlantic Ocean and the Great Lakes, and the water vapor is abundant; At the same time, cold air from Greenland often passes through it, making it the world's snowiest place for the most annual snowfall.

Washington, D.C., has seen snow that has not been seen in many years, and the cause of this snowfall is due to one of the worst winter monsoons in years, so when will the snow pick up? Snow cover doesn't have much to do with the amount of snowfall, but mainly with temperature.

Snow often falls in many areas, but this is due to the transport of water from the outside world, as well as the local temperature. After all, blood is snow that slowly condenses due to the low temperature and heavy water vapor, which is similar to a crystal-like object, so it snows, and generally anyone with high school knowledge can know how snow is formed.

However, snow does not necessarily form snow, which is actually related to the snow depth of a professional nameWhat is snow depth? In fact, when it is on the surface of the snow, the depth perpendicular to the ground is generally measured in millimeters, after all, we also know that even if it is snow, as long as it is mixed with temperature or some water on the ground, then it may become a puddle of black water on the ground, so in many places, in fact, even if it snows, it will not form a beautiful snow scene, which is related to temperature.

Under normal circumstances, the depth of how many millimeters of snow can hit by one millimeter of snow is actually very related to the temperature of the ground and how much water is contained in the bloodIf the temperature of the ground is high, then in fact, after the snow falls, it will melt naturally when it touches the ground, so it is impossible to form blood, and if the water content in the blood is more, then it will also make the snow depth relatively thin, because the water is easy to melt. If the water content is small, the snow will be deeper.

In general, the water content of snowfall in the north is generally less than that of snowfall in the southIn this scenario, if one millimeter of snowfall falls in the north, then a snow depth of 8 10 millimeters may be formed, and in the south, it is possible that this millimeter of snowfall will melt directly into water after falling to the ground.

When the snowfall is particularly heavy, snow will form on the ground, and if the snow continues to fall, it will accumulate more and more, and a large amount of snow will slowly form, also because the surface temperature is relatively low.

Because of the cold weather, the falling snowflakes do not have time to melt, and will gradually accumulate on the ground, getting thicker and thicker.

In order to form a large amount of snow, the amount of snow is only one of the factors, and the temperature needs to be below 0 degrees, so that the snow is difficult to melt, and the heavy snow that continues to fall will form snow, especially at night when the temperature is lower and there is less human activity, so the snow is more likely to form.

Because the weather is relatively cold and the snowfall is relatively large, the snowfall does not melt in a short period of time, and then piles up on the ground for a long time, forming snow.

Because of the accumulation of snowfall on the road surface, if it is not cleaned up in time, it will accumulate thicker and thicker, and finally form snow.

Transportation, life, etc. Because the snow is so heavy, it is difficult for people to travel, and the basic living materials are also a little tight.

Heavy snowfall can easily cause avalanches, which can threaten people's lives at any time. Snow cover can also cause inconvenience to people and affect the growth of crops.

This snowfall can cause avalanches, especially in some mountainous areas with perennial snow, and special precautions are required. Heavy snowfall may also cause low temperature freeze damage in Moscow, causing varying degrees of damage to the crops planted. There is also a risk of snow disasters and cold spells.

Be careful when going out after heavy snowfall.

Bad weather has caused great inconvenience to local residents. According to the statistics of the Moscow transport department, the congestion on the city's roads began on the morning of the 13th. The biggest congestion occurred on the overpass on the city's inner ring road, where large vehicles skidded and could not climb slopes, causing traffic jams for several kilometers.

The Moscow traffic police department has already provided rescue services to 387 large vehicles on the same day. More than 50 flights were delayed at three Moscow airports.

Attention to traffic safety experts reminded that it is currently at the end of the winter vacation when students return to school, the passenger flow is still large, all localities should pay attention to prevent the adverse effects of rain, snow and road ice on traffic, strengthen the management and guidance of airports, railway stations, highways and other transportation hubs and trunk lines, and the public should also reasonably arrange travel plans when going out, and pay attention to traffic safety.

In addition, some areas in the central and eastern parts of the country will also be accompanied by strong cooling, and the public, especially those with weak physique, need to adjust their clothing in time to avoid getting sick from cold.

Pay attention to keeping warm in the morning and evening, especially the joints.

Don't exercise too early, and the elderly with poor physical fitness are best to exercise in the afternoon after the temperature warms up, and choose exercises with little exercise.

Do a good job of self-carePatients with underlying diseases such as cardiovascular and cerebrovascular, rheumatoid arthritis, etc., beware of the onset of diseases.