What is the experience of "Sanfu Tian" snow?There is also climate resources behind it?

Author:China Meteorological Administr Time:2022.07.27

A few days ago, goose feather snow was under the territory of Southayan Yugu Autonomous County, Zhangye City, Gansu Province, and the ground was covered by white snow. Some citizens said that the day before was still sunny, the plan went to the mountain to avoid heat. I did not expect to meet such a big snow in the mountains, and "it feels very rare."

In fact, according to the monitoring of the meteorological departments in various places, in July this year, there have been obvious snowfall weather in the country in July this year. Is it really "rare" in July? Which regions will appear in the scene of "Sanfu Sky"?

On July 21, the goose feathers were under the territory of Soutan County, Zhangye City, Gansu, and the ground was covered by white snow/New Gansu client

1. In July, where is snowing?

On the morning of July 21, the process of obvious precipitation weather appeared in Qilian Mountain in Sunan County, Zhangye City, Gansu Province. Among them, snowfall in Huangtong Town, Kangle Town, and Dahe Township in Sunan County. According to the local meteorological department analysis, the cumulative precipitation on the day reached 30 mm and the snow depth reached 4 to 5 cm.

Zhangye Su Nan July Snow Summer Flower, Netizens: See the Four Seasons Map/New Gansu Client

On the same day, Gannan Tibetan Autonomous Prefecture in Gansu Province also had a large -scale process of precipitation. Snowfall occurred in the high altitude of Maqu County, Luqu County, and Xiahe County. According to the meteorological information officer reported, the snow depth of the snow depth of Dangqing Village, Dangqing Village, Lu La Xiuma Township, Lu La County, Maqu County reached 1 cm; 4 cm. The weather in rain and snow caused a sudden drop in temperature, and the lowest temperature reached about -5 ° C.

On July 21, Gansu Gannan Rain and Snow and hail was launched, and the "big summer" local area suddenly fell snow. The picture shows local residents of Gannan Prefecture as nucleic acids in the snow

In addition to snow in Gansu, Xinjiang is also down! According to the "Bayin Guo Leng Daily" reported on July 18, snowflakes floated in the Baluntai Town area of Xinjiang and Jingxian County, so that tourists who came to Babzhou felt "July Flying Snow". Snowflakes fell on the grass and the snowy mountains in the distance became interesting, and past tourists took pictures.

Since entering Sanfu, snowfall has emerged in many areas of Xinjiang. "On July 12, we came to the northern section of Duku Highway to travel by self -driving. When we met snow halfway, the snowflakes were not small, but it was melted on the ground. reporter.

Xinjiang Altay Snow. Interviewee Picture/People's Daily Health Client

In addition to Gansu and Xinjiang, the high -altitude areas of Qinghai also ushered in snow!

Affected by the warm and humid airflow of the southwest of the subtropical high -pressure periphery, on July 17, the obvious precipitation weather occurred in the eastern area of Haixi Prefecture, Qinghai Province. Among them, Snowfall appeared in Mili Town, Tianjun County. It is reported that precipitation began to appear at 22:00 on the 17th, and the precipitation at night was strong, resulting in the temperature continued to decline, the weather phenomenon of rain and snow appeared. By 04:00 on the 18th, it turned to snow. 3.0 cm.

On July 17, snowfall weather maps in Mili Town, Tianjun County, Qinghai Province/CCTV News

2. Is it rare for "Sanfu Sky" to snow?

The feedback of the meteorological department in many places can only be regarded as "rare" in high -altitude areas, but it can only be regarded as "rare", but not "rare."

The reporter consulted the report report of the ground meteorological observation records of the relevant grassroots stations and found that among the three counties of snow in Gannan Prefecture, since the establishment of the station in 1973, the "San Fu Tian" has a total of 9 times of snowfall; Maqu County Since the establishment of the station in 1967, there have been 9 times of snowfall in the "Sanfu Sky"; since the construction of Xiahe County in 1965, snowfall has not occurred in July and August.

Data: Jin Manhui Drawing/Zhang Juan

The average altitude of 3200 meters in Sunan County, Gansu, a large temperature difference between day and night. Cold air is easy to form snowfall when encountering sufficient water vapor. For relative temperature conditions, water vapor conditions are the main factor restricting the emergence of snowfall locally. According to statistics, it is not uncommon for snowfall after summer, but such a large area of snowfall is rare.

As the altitude rises, snowfall in July and August is getting less and less "rare." In addition to Qinghai, Gansu, and Xinjiang, the Tibet Autonomous Region has more than 4,000 meters above sea level. High -altitude areas and Laochang have snow all year round.

Since the local meteorological records in 1951, statistics from 38 stations in Tibet Autonomous Region show that in July in Tibet history, there have been 103 snowfall in July. The area where Tibet was snowing in July was mainly distributed in Naqu City, Ali area, southern Shigato, and south of Shannan City.

3. What is the cause of "Sanfu Sky" to snow?

The snow we are familiar with is actually a kind of precipitation. When the temperature in the clouds is too low, the water vapor in the atmosphere is directly condensed or the water droplets are directly solidified, which is snow. The lower temperature and sufficient water vapor conditions are indispensable.

The cause of snowfall in many places in July this year is mainly due to the sudden drop in temperature in high altitude areas, and the conditions of water vapor are better, which creates the scenery of "Sanfu Tianfei Snow".

Taking Gannan Prefecture as an example, Ji Zhejun, the director of the State Meteorological Observatory, analyzed that the cause of this snowfall was the sudden enhancement of the cold vortex in the north, and the cold air split south of the cold vortex and the development of strong southwest heating and humidity "met the narrow road", so they were self -made locally. A clear process of cooling and precipitation was formed west to east. Due to the strong strength of the cold air this time, the cooling of the cooling is fierce, and the water vapor transportation is strong, it has formed snowfall in high altitude areas such as Maqu, Luqu, and Xiahe.

On July 21, a heavy snow map/New Gansu client in Sunan County, Gansu

4. "Sanfu Sky" snow hidden climate resources?

In high altitude areas, if the "anti -season" snowfall occurs at the end of autumn, it is easy to form frost damage, affecting the output of crops and pastures. But at this time in the midsummer season, even in the plateau mountain, the temperature is relatively high, the snow melting speed is fast, and it has little effect on local transportation and livestock foraging. More importantly, snowfall effectively increases the soil feelings and has a certain promotion effect on the growth of pastoral grass. On July 17, snowfall weather maps in Mili Town, Tianjun County, Qinghai Province/CCTV News

On the other hand, the scene of the "Sanfu Sky Snow" on the plateau not only became popular on the Internet, but also made many people see the development potential of "anti -season tourism". Meteorological experts in the above -mentioned area told reporters that although they want to see "Snow" need a suitable opportunity, there are few hot summer weather in the local summer, which is indeed a good place for summer.

For example, Gannan Prefecture is located in the transitional area of the northeast edge of the Qinghai -Tibet Plateau and the west of the Loess Plateau. It is the intersection belt of Tibet and Han culture. It is the water conservation area and supply area of the Yellow River and the Yangtze River. It is known as the "window of the Qinghai -Tibet Plateau". The mountains of Gannan Prefecture are overlapping, the river is vertical and horizontal, and the natural landscape is also very rich. It is located in grasslands, lakes, canyons, rivers, caves ... The local summer is cool, the sunshine time is long, and the average annual temperature is 2.3 to 13.8 ° C. With the development of the tourism and service industry in recent years, the local area is very suitable for digging in the potential of summer tourism.

The summer cars of the dangchang car are green and grassy, and the scenery is beautiful. Group ducks, cattle and sheep in groups, a beautiful scene of the grassland beautiful scenery/daily Gansu

Beautiful Zhaxiana Scenic Area. Photo Conferring in Rong Media Center, Dinobu County, Gansu

Tibet is also a summer sacred place in summer. The average altitude of Nyingchi, known for its peach blossoms is about 3000 meters above sea level, and the average temperature of about 20 ° C from July to August. The climate is pleasant. In summer, it becomes a "paradise" for tourists to avoid summer heat. Among them, Lulan Town and Shannan City, Lulan Town, Lalau, and La Lubou ditch. It is a good place to avoid summer summer heat.

In the summer season, the climate of the Lulan Town in Nyingchi City, Tibet, has become a "paradise" for tourists to avoid summer heat. The picture shows the ranch in the Tourism Town of Lulang (taken July 26, 2020) in Figure/Xinhuanet