The Mongolian cyclone is the "behind the scenes" of this round of yellow sand
From March 27th to March 28th, affected by the Mongolian cyclone and the rear cold air, floating dust or blowing sand occurred in Inner Mongolia and northern North China. Among them, sandstorms occurred in Xilin Gol and Chifeng in Inner Mongolia, and the air quality "exploded".
Most northern areas such as Beijing and Hebei are also plagued by sand and dust, and there are also sandstorms in the local area.
What is the scope of impact of this sandstorm?
When will it end?
Compared with the last sand and dust weather process, what are the characteristics?
The reporter interviewed Zhang Tao, chief forecaster of the Central Meteorological Observatory, Rao Xiaoqin, senior engineer of the Environmental Meteorological Center of the Central Meteorological Observatory, and Wu Xiaojing, deputy director of the Remote Sensing Application Office of the National Satellite Meteorological Center.
Reporter: Which areas have been affected by this round of sand and dust weather? When will it end?
Zhang Tao:
During the daytime on March 28, sand and dust continued to spread east, south, and west. The boundary was roughly located in Hexi, Guanzhong, Huanghuai, and central Liao-Ji. The southwest direction was mainly characterized by floating dust, and the east road was marked by wind and sand. Visibility in the area is less than 1 km.
Specifically, the southern and eastern Xinjiang basins, northeastern Qinghai, most of Inner Mongolia, Hexi and eastern Gansu, Ningxia, northern central Shaanxi, Shanxi, Hebei, Beijing, Tianjin, northern Henan, Shandong, central and western Liaoning, western Jilin, There are blowing sand or floating dust in the southwest of Heilongjiang and other places.
Among them, there were sandstorms in parts of central and southeastern Inner Mongolia, northwestern Shanxi, central and northern Hebei, Beijing, Tianjin, and western Liaoning, and local strong sandstorms in southeastern Inner Mongolia.
From the night of March 28, the intensity of sand and dust weather in the above-mentioned areas has weakened, mainly due to blowing sand or floating dust, but there are still sandstorms in southeastern Inner Mongolia, western Liaoning and other places.
Reporter: What is the cause of this round of sand and dust weather? Compared with the severe sandstorm weather process from March 14th to March 18th, what are the characteristics?
Rao Xiaoqin: The
main reason is that since last winter, the precipitation in Mongolia, the central and western regions of Inner Mongolia, and the northwestern region of China has continued to be low, and the snow cover has been relatively small; since February this year, the temperature in these areas has been significantly higher and the surface soil has become relatively loose. The conditions for sanding are good, which is the material basis for the formation of sand and dust weather.
The strong sandstorm weather this time was mainly due to the Mongolian cyclone and cold high pressure, which carried sand and dust on the surface to high altitudes and then transmitted them over long distances.
The power conditions for dust emission and transmission are good.
Both times were strong sandstorms.
On the whole, compared with the severe sandstorm weather process from March 14 to March 18, the impact of this sandstorm is smaller than the previous one, and the duration is relatively shorter.
Judging from the conditions of sand emission, the strong sandstorm weather from March 14 to 18 was mainly due to the cold and high pressure transporting sand and dust from Mongolia to our country, and the wind was very strong, resulting in particularly large amounts of sand in Mongolia.
This time, the Mongolian cyclone moved slightly to the southeast, but it also superimposed the local sand emission in Inner Mongolia, which also contributed to a certain extent.
In terms of intensity, the concentration of sand and dust in the previous round was higher.
In this dusty weather, the ground cold high pressure system at the rear of the Mongolian cyclone was not as strong as last time, so the amount of sand emission in Mongolia was slightly smaller than last time.
Reporter: How about my country's Fengyun satellite monitoring of sand and dust weather? Can it be accurately forecasted?
Wu Xiaojing: The
meteorological department has accurate forecasts and was praised by the State Forestry and Grassland Administration, which played an important role in emergency response to dust storms.
After the occurrence of the sand and dust weather, my country used the Fengyun 4 meteorological satellite to monitor the entire movement of the sand and dust in real time, and obtain satellite observation images every 5 minutes.
The important "behind the scenes" of this sand-dust process-the central area of the spiral cloud system of the Mongolian cyclone is clearly visible in northeastern Inner Mongolia.
It can be seen from the satellite dust detection map that the dust is mainly located in the southern part of Mongolia, the western part of my country's Inner Mongolia and the northern part of central China.
The sand and dust monitoring of FY-4 A star shows that there are two migration paths of the Mongolian cyclone: one is to enter my country's Inner Mongolia to the east, and then to continue eastward along the lower Songhua River via the Northeast Plain; Go east via the Korean Peninsula.
(Our newspaper, Beijing, March 28th, by our reporter Yuan Yufei)