2000~2021年中国沙尘传输路径特征及气象成因分析

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Abstract Based on the analysis of the ground data from 673 dust observation stations in China and meteorological conditions over the past 22 years, the evolution and transmission characteristics of sand and dust (SDS) weather processes in northern China, as well as the effects of changes in meteorological factors were determined. The frequency and intensity of SDS events in Northern China during 2000 to 2021 showed a decreasing trend. SDS events in spring accounted for 77.8%, of which nearly 40% occurred in April, significantly higher than other months. Among the five typical transmission paths, the northwest path, the western path, and the northern path types were the most important, accounting for 38.5%, 32.9% and 18.2%, respectively. Meanwhile, the transmission path of dust in spring has the characteristics of staged distribution. From 2000 to 2006, the northwest path was dominant. During the transition period from 2007 to 2013, the transition period showed an increasing trend in the western path and a decreasing trend in the northwest path until the two were equally proportioned. After 2014, the western path was adjusted to become the main transmission path for spring dust weather for spring SDS weather. In addition, the spring climate has turned to ‘warm and humid’ type, and East Asian SDS has generally weakened. However, the center of the Asian polar vortex gradually moved westward and northward, moving to the east of Novaya Zemlya. There was a strong sea-level pressure gradient between Northwest Asia and Central Asia, and the low-level wind speeds in the main dust sources in the central and eastern parts of Northwest China continued to increase, which was conductive to the increase of western path SDS events.

Key words： sand and dust weather spring season transmission pathway meteorological condition East Asia

Received: 20 February 2023

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X513

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	Articles by authors
	XU Ran
	ZHANG Bi-hui
	AN Lin-chang
	LI Lei
	CHI Xi-yuan
	JIANG Qi

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XU Ran,ZHANG Bi-hui,AN Lin-chang等. Analysis of sand and dust storm transport paths characteristics and meteorological causes in China from 2000 to 2021[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(9): 4450-4458.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I9/4450

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