Beijing, 4 Apr (ZXS) -- According to the China Meteorological Administration on 11 April, since the beginning of this year, China has had eight sandstorm weather processes, and the sandstorm weather process since the 11th has reached the level of sandstorms, which is the second sandstorm process this year.
April 4, Hohhot, Inner Mongolia, Qingcheng Park in windy and dusty weather. Photo by China News Agency reporter Liu Wenhua
Monitoring shows that due to the influence of the Mongolian cyclone and the cold air behind, since the 9th, sandstorms have occurred in southern and eastern Xinjiang, central and western Inner Mongolia, central and western Gansu, Ningxia, north-central Shaanxi, Shanxi, Hebei, Beijing, Tianjin, northern Shandong, northern Henan, central Jilin, north-central Liaoning and other places, among which, sandstorms have occurred in Hohhot, Bayannur, Alxa and Datong, Beijing and other places in Inner Mongolia, and strong sandstorms have occurred in Xilin Gol, Baotou, Ulanqab and Zhangjiakou, Hebei. During this dust weather process, the peak concentration of PM10 in many places in the north exceeded 2000 micrograms / cubic meter.
On the 11th, as the cold air moved eastward to the south, the dust weather continued to advance south. Environmental monitoring shows that the PM10 concentration area spreads to the south as a whole, and the PM10 concentration in southern Henan and southern Shandong exceeds 500 micrograms per cubic meter.
On April 4, Harbin City experienced strong winds and sand, dusky and poor visibility. Photo/Visual China
According to the monitoring of China's State Forestry and Grassland Administration, the sand and dust weather mainly originated in the southern part of Mongolia and the central and western regions of Inner Mongolia in China, and as of 11 o'clock on the 8th, it mainly affected 15 counties (cities, districts and banners) in 902 provinces (autonomous regions and municipalities directly under the central government), covering an area of about 229.4 million square kilometers and a population of about 09 million people.
According to experts, the main causes of the occurrence of sand and dust weather are: first, China's cold air activity is still in an active period, and the wind generated by the Mongolian cyclone and the ground cold front is large, which provides the power conditions for the occurrence of sand and dust weather; Second, the temperature rises rapidly in the early stage, and the unstable air state provides thermal conditions for sand up. Third, the precipitation in Mongolia and China in the early stage of sand and dust source areas is low, the soil moisture is biased, and the current vegetation has not yet turned green, and the surface is exposed, which is not conducive to suppressing the occurrence of sand and dust weather.
The Central Meteorological Observatory continued to issue a blue warning for sandstorms on the morning of the 11th. It is expected that from the 13th to the 16th, there will still be more sand and dust in Northwest China and North China, among which, from the night of the 13th to the 14th, the sand and dust weather may affect Beijing-Tianjin-Hebei and other places again.
Meteorological experts said that in the coming week, North China, Huanghuai and Northeast China need to pay attention to the low visibility of sand and dust affecting traffic travel, and do a good job in traffic safety facilitation and management; At the same time, it is concerned about the health risks caused by high concentrations of sand and dust particles to the human respiratory system; Affected by strong winds and other factors, the forest and grassland fire risk meteorological level in eastern Inner Mongolia, northern Hebei, northern Beijing, central Heilongjiang, central Jilin, northern Liaoning and other places is relatively high, and it is recommended that all localities strengthen the management of wildland fire sources and do a good job in the investigation and rectification of fire risk hidden danger points. (End)