There will be two rounds of sand and dust weather in northern my country this week
From the 15th to the 16th, the sand-dust process may significantly affect the Beijing-Tianjin-Hebei region and surrounding areas; my country has had 6 sand-dust weather processes this year
From the 15th to the 16th, affected by the Mongolian cyclone and the strong cold air behind it, there may be a sand and dust process that significantly affects the Beijing-Tianjin-Hebei region and its surrounding areas. The specific situation is to be determined.
From this night to the 16th, there were sandstorms in parts of the southern Xinjiang Basin and eastern Xinjiang, central and western Inner Mongolia, and northern Ningxia. There were sandstorms in western Inner Mongolia and southern Xinjiang.
According to the latest forecast from the Central Meteorological Observatory, northern my country will experience two rounds of sand and dust weather this week.
It is expected that there will be sand or floating dust in parts of the southern Xinjiang basin and eastern Xinjiang, central and western Inner Mongolia, western Gansu, northern Ningxia, northern Hebei and other places from yesterday to today, and sandstorms in the northern part of western Inner Mongolia and southern Xinjiang.
From the 14th to the 16th, affected by the cold air and strong winds, there were blowing sand or floating dust from west to east in the eastern part of Northwest China, northern China and other places, and there were sandstorms in the local area.
Specifically, the Beijing-Tianjin-Hebei region and surrounding areas had no obvious haze from the night of yesterday to the 14th.
From the 15th to the 16th, the area will be affected by sand and dust weather from west to east.
In the next week in the northwestern region, there will be dusty weather in the region.
From this night to the 16th, there were sandstorms in parts of the southern Xinjiang Basin and eastern Xinjiang, central and western Inner Mongolia, northwestern Qinghai, western and northern Gansu, and northern Ningxia. There were sandstorms in western Inner Mongolia and southern Xinjiang.
Sand and dust weather affects Beijing-Tianjin-Hebei from 15th to 16th
According to the China Environmental Monitoring Center, the air quality of the affected cities may deteriorate by 2-3 levels on the basis of the original forecast, and there will be moderate or more pollution.
Starting early yesterday morning, sand and dust originating from southern Mongolia entered our country, affecting central and western Inner Mongolia, Hexi in Gansu, Ningxia, and northern Shaanxi successively. The cities passing by dust air masses may have moderate or more pollution.
Today, as the cold air moves eastward and southward, the northwestern region is less affected by the blowing sand or floating dust weather, and the air quality will be improved to a certain extent.
From the night of the 13th to the 14th, the sand and dust process in Japan will gradually dissipate, and the air quality will return to lightly polluted or below.
The sand and dust process has limited impact on the air quality in the Beijing-Tianjin-Hebei region. It is expected that there may be a short-term increase in PM10 concentration in the northwest of the region, mainly light pollution, and the possibility of large-scale moderate or above pollution is low.
From the 15th to the 16th, affected by the Mongolian cyclone and the strong cold air behind it, there may be a sand and dust process that significantly affects the Beijing-Tianjin-Hebei region and its surrounding areas. The specific situation is to be determined.
Meteorological conditions are conducive to the emergence of sand and dust and development to the south
The north has encountered frequent sand and dust weather this year. The National Air Pollution Prevention and Control Center has issued a paper analysis. Since late February this year, the temperature in Mongolia and western Inner Mongolia has been abnormally high by 2-6°C, leading to premature snow melting and exposed sand sources. .
At the same time, the vegetation covering the surface has not yet grown, and the vegetation coverage rate in the southern part of Mongolia and the western part of Inner Mongolia is relatively low, providing a sufficient "sand source" for the occurrence of dusty weather.
In addition, the Siberian High this year is stronger than normal, and the weather conditions are conducive to the emergence of sand and dust and its development to the south.
The Mongolian cyclone and gale are the “porters” of sand and dust, responsible for the two important links of “sanding” and “transporting”.
Judging from the two strong sandstorms in March, there was a clear Mongolian cyclone that formed and moved eastward. It was like a blower that swept the sand and dust to the upper air, and then carried the sand and dust all the way to the south and east. My country.
A few days ago, the China Meteorological Administration issued the "Atmospheric Environment Meteorological Bulletin (2020)". Data shows that there were 10 sand and dust weather processes in my country in 2020, 5 less than in 2019, and also shorter than the average of the past 5 years (13.2 Times) is less.
However, since 2000, the number of sand-dust weather processes in my country has shown a trend of first decreasing and then increasing.
Follow 1
The number of sand and dust weather last year was less than the average of the past five years
In 2020, there will be 10 sand-dust weather processes in my country, including 7 sand-blowing weather processes, 2 sand-dust storm weather processes, and 1 strong sand-dust storm weather process.
The number of sand and dust weather processes is 5 less than that in 2019, and significantly less than the average of the past 5 years (13.2).
The first process was the sandstorm weather process from February 13 to 15, 2020, which occurred 34 days earlier than 2019 (March 19) and 3 days earlier than the average from 2000 to 2019 (February 16) .
The most intense process was the severe sandstorm weather process from March 8th to 10th. Strong sandstorms occurred in parts of the southern Xinjiang Basin.
The most influential process was the blowing sand weather process from October 20 to 21, affecting the eastern part of the Northwest China, northeast China, northern China, Huanghuai, Jianghuai and other places.
In 2020, there will be sand and dust weather in parts of Northwest China, North China, Northeast China, Huanghuai and Jianghuai, and eastern Tibet.
The number of days of sand and dust weather in North China, the northern part of Huanghuai and the western part of Northeast China is 3-10 days, the eastern part of Northwest China is about 10-43 days, and the southern Xinjiang Basin is about 50-120 days. Among them, Xinjiang Yutian Station has the most days, reaching 131 days.
Sandstorms mainly occur in the southern Xinjiang basin of Xinjiang, northwestern Qinghai, central and western Gansu, northern and western Inner Mongolia, among which the number of days in western Inner Mongolia is about 1-3 days, and the number of days in the southern Xinjiang basin is 8-10 days.
Severe dust storms mainly occurred in the Southern Xinjiang Basin, northwestern Qinghai and western Inner Mongolia, with days ranging from 1-3 days to 5-6 days locally in the southeastern part of the Southern Xinjiang Basin.
In 2020, the number of days of sand and dust weather in most parts of northern my country will be less than the average of the past five years. Only some areas in northern Xinjiang, western southern Xinjiang basin, central Inner Mongolia, eastern Northwest, southern Northeast China, northern North China, Jianghuai and other places are slightly less frequent. There is an increase.
Among them, the number of days of sand and dust weather in the eastern part of the southern Xinjiang Basin decreased by about 10-60 days.
Compared with the past 5 years, the number of sandstorm days in northern Xinjiang, eastern northwestern and parts of central and eastern Inner Mongolia decreased by 0-2 days on average, and in the southern Xinjiang Basin decreased by 1-3 days; parts of western Inner Mongolia and eastern Xinjiang’s southern Xinjiang Basin have local sandstorms The number of days increased by 0-3 days on average compared with the last 5 years.
Follow 2
The number of sandstorms has decreased significantly since 2000
The Meteorological Bulletin shows that from 2000 to 2020, the number of sand-dust weather processes showed a trend of first decreasing and then increasing, but the number of sand-dust weather processes in 2020 was significantly less.
According to the analysis of the communiqué, the weather conditions in the northern region of last spring were generally favorable for the reduction of sand and dust weather compared to 2019, the cold air in the sand source area in spring was weaker than usual, the number of strong wind days was less than that in 2019, and the dynamic conditions for sand emission were insufficient. The precipitation at the beginning of 2020 was significantly higher than that in the same period of the previous year, and the landmark conditions were better.
From 2000 to 2010, there were an average of 15.7 sand and dust weather processes per year, while from 2011 to 2014 there were only 7 to 10 times per year (an average of 8.8 times). From 2015 to 2019, the number of sand and dust weather processes each year increased to an average of 13.2 Times.
From 2000 to 2020, the number of sandstorm weather processes showed a significant decreasing trend. Among them, from 2000 to 2010, there were an average of 6.5 sandstorm weather processes per year, and from 2011 to 2020, there were only 1.9 times per year on average.
From 2000 to 2020, there were 1-2 times of moderate and strong sandstorms in most years, and only 5 times in 2001, 2002 and 2006.
Follow 3
There have been 6 sandy days this year
According to data from the China Meteorological Administration, as of the beginning of April, the average number of dust days in northern my country this year was 11.5 days, the most since 2005. Since the beginning of this year, my country has experienced 6 sand and dust weather processes, including 3 in March. process.
March 13-18 and 27-29 were the process of strong sandstorms, and the remaining four were the process of blowing sand.
From March 13th to 18th, my country's strongest sand and dust weather process occurred in the past 10 years, with a long duration and a wide range of influence.
Jia Xiaolong, deputy director of the National Climate Center, introduced at the April press conference of the China Meteorological Administration that there are two main reasons for the frequent occurrence of sand and dust this year.
Mongolia and northwest China are important areas for the formation of sand and dust. Last year, the temperature in Mongolia and most of the northwest my country was significantly higher, and the surface was basically not covered by snow. Such surface conditions were the main reason for the occurrence of sand and dust weather.
In addition, the cold air Siberian High that affects our country has increased several times, providing very powerful dynamic conditions for the formation of sand and dust weather. Mongolia, Northwest China, and North China are affected by the phased northwest wind, which is conducive to the removal of sand and dust. The source area is transported to the south-central direction, resulting in a large-scale obvious sand-dust weather process in northern my country.
Beijing News reporter Li Yukun