Beijing, March 3 (ZXS) -- This reporter learned from China's State Forestry and Grassland Administration (State Forestry and Grassland Administration) on March 23 that the recent severe sandstorm weather process affected about 23 million people.
According to statistics, since March, China has had a total of four sand and dust weather processes, including two sand weather processes, one sandstorm weather process and one strong sandstorm weather process, which is more than the same period last year (3 times) and more than the same period in the past 4 years (2.1 times).
The weather process of strong sandstorms that occurred from the 19th to the 22nd mainly originated in southern Mongolia and southern Xinjiang of China, and had a large impact and strong intensity. It mainly affected 15 provinces of Xinjiang, Gansu, Qinghai, Inner Mongolia, Ningxia, Shaanxi, Shanxi, Beijing, Tianjin, Hebei, Liaoning, Jilin, Heilongjiang, Shandong and Henan, with an affected land area of about 362.5 million square kilometers and an affected population of about 6 million people. Among them, strong sandstorms occurred in Ruoqiang in Xinjiang, Zhangye in Gansu, Erlianhot in Inner Mongolia, and Baicheng in Jilin.
According to the National Forestry and Grassland Administration, there are three main causes of recent sand and dust weather: first, the wind generated by frequent cold air is large, the instantaneous wind speed in many places exceeds 20.8 meters per second, and the gusts reach more than 9, which provides power conditions for the occurrence of sand and dust weather; second, from late February to early March, the temperature in sand and dust source areas such as Mongolia and northwest China is high, among which the temperature in most of Inner Mongolia, Beijing, Tianjin, northern and central Hebei, northern Shanxi, northern Shaanxi, and northern Ningxia is 2~3 °C higher. Unstable air conditions provide thermal conditions; Third, the vegetation growth in southern Mongolia in 1 is evenly biased compared with the average situation in 2 and the past 2022 years, and the precipitation in the sand and dust source areas in China in the early stage is less, and the soil moisture deviation, especially in the north of North China, eastern Inner Mongolia and eastern Xinjiang, the precipitation is obvious, the vegetation growth status is biased, and the current vegetation has not yet returned to green, and the surface conditions are not conducive to inhibiting the occurrence of sand and dust weather.
The relevant person in charge of the State Forestry and Grassland Administration said that the State Forestry and Grassland Administration has launched 24-hour dynamic monitoring, and paid close attention to it by various means such as satellite remote sensing monitoring, ground observation, and information personnel reporting field information. At the same time, it has held rolling consultations with relevant units of the China Meteorological Administration to study and judge the development trend, and send the results of the discussion and judgment to the relevant areas in time to remind the downstream areas to take precautions.
The person in charge said that in recent years, China's desertification and desertification land area has continued to shrink, and good results have been achieved in desertification prevention and control. However, China still has 257,37,168 square kilometers of desertified land and 78,<>,<> square kilometers of desertified land, especially large areas of desert and Gobi have always been huge and permanent sources of sand and dust, and desertification prevention and control will be a long-term and arduous important task. (End)