气候变化领域集成服务门户(CCPortal): Dust aerosols: A possible accelerant for an increasingly arid climate in North China

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DOI	10.1016/j.jaridenv.2008.02.017
	Dust aerosols: A possible accelerant for an increasingly arid climate in North China
	Han, Y.; Dai, X.; Fang, X.; Chen, Y.; Kang, F.
通讯作者	Han, Y (通讯作者)
发表日期	2008
ISSN	0140-1963
EISSN	1095-922X
起始页码	1476
结束页码	1489
卷号	72 期号:8
英文摘要	Results integrated from several data sources such as the vertical distribution characteristics of dust aerosols detected by aircraft, optical particle counter and Lidar measurements in the troposphere, dust devils, dry heat convection, and cloud parameter characteristics monitored by satellites, allow the identification of a new upwards dust transport mechanism. During non-dust storm periods, fine dust particles can be firstly carried into the atmosphere about 10-200 m by dust devils. Next, they can be carried to the height of the boundary layer at about 1000-6000 m by strong dry heat convection, so that a well-mixed dust layer dominates, which may even develop an elevated dust layer over the desert in the warm and sunny season. These processes lead to high dust aerosol concentrations in the desert troposphere, which results in an increase of condensation nuclei in clouds, a decrease of the effective radius of cloud droplets, and thus the formation of precipitation is suppressed. This paper develops a mechanism of positive feedback, which follows the following sequence: dust aerosol increases-effective radius of cloud droplet decreases-precipitation decreases-arid climate is strengthened. This new mechanism is a distinct factor in the development of an arid climate, especially desert in North China, and gradually becomes one of the most important factors maintaining an and climate in North China. The positive feedback can accelerate desertification in this area. (c) 2008 Elsevier Ltd. All rights reserved.
关键词	PLATEAU PRECIPITATION UPLIFT DESERTIFICATION CONVECTION FEEDBACK CLOUDS
英文关键词	arid climate; dust aerosol; dust devil; effective radius of cloud droplet; vertical distribution
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Ecology ; Environmental Sciences
WOS记录号	WOS:000257459500007
来源期刊	JOURNAL OF ARID ENVIRONMENTS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/257581
推荐引用方式 GB/T 7714	Han, Y.,Dai, X.,Fang, X.,et al. Dust aerosols: A possible accelerant for an increasingly arid climate in North China[J]. 中国科学院青藏高原研究所,2008,72(8).
APA	Han, Y.,Dai, X.,Fang, X.,Chen, Y.,&Kang, F..(2008).Dust aerosols: A possible accelerant for an increasingly arid climate in North China.JOURNAL OF ARID ENVIRONMENTS,72(8).
MLA	Han, Y.,et al."Dust aerosols: A possible accelerant for an increasingly arid climate in North China".JOURNAL OF ARID ENVIRONMENTS 72.8(2008).