Beijing, 3 Mar (ZXS) -- On 22 March, under the influence of cold air, most of northern China was hit by strong sandstorms. What is the impact of this round of sandstorm weather? Will northern China continue to be affected by sand and dust this spring?
On the 21st, a wide range of sand and dust weather began to cover northwest China, north China and other places, on the 22nd, sand and dust with cold air further advanced, on the 22nd at 6 o'clock, the Central Meteorological Observatory issued a yellow warning for sandstorms, cold air continued to bring wind, cooling and dust weather to the northern region.
The Central Meteorological Observatory predicts that affected by cold air and winds, from the 22nd to the 23rd, there will be sandstorms in parts of southern Xinjiang, northern Qinghai, south-central Gansu, Ningxia, most of Inner Mongolia, most of Shaanxi, Shanxi, Hebei, Beijing, Tianjin, central and western Heilongjiang, central and western Jilin, Liaoning, Shandong, Henan, northern Jiangsu, northern Anhui, northern Hubei and other places, among which, there are sandstorms in parts of southeastern Inner Mongolia, Beijing, northern Tianjin, north-central Hebei and other places, and strong sandstorms in local areas. A total of 18 provinces, autonomous regions and municipalities were affected by the sandstorm.
The Beijing Meteorological Observatory upgraded and issued a yellow warning signal for sandstorms at 3:22 on March 05. The picture shows the morning peak of work that day, and there has been obvious sand and dust weather in Beijing. Photo by Sheng Jiapeng, reporter of China News Agency
On the morning of the 22nd, Beijing, Tianjin, Hebei and other places ushered in the core period affected by sand and dust. According to the data updated by the Beijing Ecological Environment Monitoring Center at 22 o'clock on the 9nd, Beijing's real-time air quality index is 500, which has reached level 6 serious pollution. "Yellow Sand" is once again staged in Beijing.
For the cause of this round of sandstorm weather, Zhang Tao, chief forecaster of the Central Meteorological Observatory, said that this round of sandstorm weather comes with cold air, and this round of cold air is strong and has many effects. The strong winds and cooling caused by cold air mainly affect northwest China, Inner Mongolia, north China, northeast China, Huanghuai and other places, and will bring 6 to 8 °C cooling, especially in Inner Mongolia and parts of northeast China, the cooling range can reach 10 °C. At the same time, there will be northwesterly winds of magnitude 4 to 6, gusts of magnitude 7 to 9, accompanied by a wide range of dust weather.
Zhang Tao said that the reason for the windy and dusty weather is because the current land is warming up, the sun has loosened the surface, and spring happens to be the season of frequent cold air and wind. Therefore, when strong winds pass through the sand sources in Mongolia and western Inner Mongolia and Gansu in China, it will roll the sand and dust into the air, and with the low air flow to the east to the south, affecting the east and south of Inner Mongolia.
Looking forward to the later stage, Zhang Tao introduced that since March this year, China has had four sand and dust weather processes, which is more for March, but if it is for the entire spring, it is also necessary to pay attention to the weather conditions in April and May in the future.
Since the beginning of this century, the sand and dust weather process in China has shown a significant trend of reduction, but the spring (March to May) of each year is still the high incidence period of sand and dust in the north. From 3 to 5, China experienced a total of 2000 large-scale severe sandstorms, with an average of about 2020.32 per year, mainly in March and April (1 in March and 5 in April), and the most frequent years occurred 3 times (4, 3, 11). From March 4 to 14, 5, northern China experienced its strongest sandstorm in a decade, affecting more than 2001.2002 million square kilometers.
Zhang Tao said that a wide range of windy and dusty weather will lead to reduced visibility, which will adversely affect traffic travel, etc., and it is recommended to do a good job in traffic safety management, wind reinforcement and human health protection, and pay attention to preventing forest grasslands and urban and rural fires. The public should pay attention to carrying masks, scarves and other dust-proof supplies when going out to avoid damage to the eyes and respiratory tract caused by sand and dust, and drivers should control their speed to ensure safety. (End)