Regional spatial and temporal variation characteristics of dust in East Asia
BAO Chunling,1,2, YONG Mei,1,2, JIN Eerdemutu1,2, BAO Yulong1, Tubuxin Bayaer1,2, BAO Yuhai1,21. College of Geographical Science, Inner Mongolia Normal University, Hohhot 010022, China 2. Inner Mongolia Key Laboratory of Remote Sensing & Geography Information System, Inner Mongolia Normal University, Hohhot 010022, China
Abstract Dusty weather is one of the most common disasters in East Asia. Severe dust storm can not only lead to building collapses, the destruction of vegetation, and human and animal casualties, but also cause fires, air pollution, and other environmental problems, which has a great impact on social and economic activities and the global dust cycle. In recent years, the severe dust storm in the study area has been increasing, which seriously threatens the ecological security and socio-economic development of China and its surrounding areas. In the spring of 2021, the strongest dust event seen in the past decade occurred in northern China, which attracted wide attention from the departments concerned. However, there is relatively little research on dusty weather in East Asia from the perspective of the regional characteristics of long time series. In this paper, using data from 697 meteorological stations that recorded dusty weather in East Asia for the period from 1981 to 2019, we examined the spatio-temporal distribution characteristics of dust frequency in East Asian. The results indicate that (1) spatially, East Asian dust is concentrated in the inland arid area, such as Mongolia and Northwest China. The weak dust weather is frequent in three regions— Mongolia Gobi Desert, Taklimakan Desert, and Badan Jaran Desert; while severe dust storms are frequent in two regions—northwest Mongolia and Mongolia Gobi Desert. (2) Temporally, East Asian dusty weather is concentrated in spring (March to May). Dusty weather is most frequent in March in the north of the Qinghai-Tibet Plateau at lower latitudes, in April in most parts of northern China at middle latitudes, and in May in eastern Kazakhstan and Mongolia at higher latitudes. (3) In the past 40 years, the dusty weather in East Asia showed a decreasing trend, especially since the effective implementation of many ecological projects after 2000, the number of dusty weather events in most parts of northern China has decreased significantly, but in the central and western parts of Inner Mongolia severe dust storm showed an increasing rend in recent years. In areas with fragile ecological environment, such as Mongolia and Taklimakan Desert, both weak and severe dust storms showed an increasing trend. This study is of great significance for understanding characteristics of dust distribution and preventing dust disasters in East Asia. Keywords:dusty weather;regional characteristic;spatial distribution characteristic;temporal variation characteristic;East Asia
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