气候变化领域集成服务门户(CCPortal): Effect of rainfall-induced diabatic heating over southern China on the formation of wintertime haze on the North China Plain

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DOI	10.5194/acp-22-725-2022
	Effect of rainfall-induced diabatic heating over southern China on the formation of wintertime haze on the North China Plain
	An, Xiadong; Sheng, Lifang; Li, Chun; Chen, Wen; Tang, Yulian; Huangfu, Jingliang
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	725
结束页码	738
卷号	22 期号:2 页码:14
英文摘要	During the winters (December-February) between 1985 and 2015, the North China Plain (NCP, 30-40.5 degrees N, 112-121.5 degrees E) suffered many periods of heavy haze, and these episodes were contemporaneous with extreme rainfall over southern China; i.e., south rainfall-north haze events. The formation of such haze events depends on meteorological conditions which are related to the atmospheric circulation associated with rainfall over southern China, but the underlying physical mechanism remains unclear. This study uses observations and model simulations to demonstrate that haze over the NCP is modulated by anomalous anticyclonic circulation caused by the two Rossby wave trains, in conjunction with the north-south circulation system, which ascends over southern China, moves north into northern China near 200-250 hPa, and then descends in the study area. Moreover, in response to rainfall heating, southern China is an obvious Rossby wave source, supporting waves along the subtropical westerly jet waveguide and finally strengthening anticyclonic circulation over the NCP. Composite analysis indicates that these changes lead to a stronger descending motion, higher relative humidity, and a weaker northerly wind, which favors the production and accumulation of haze over the NCP. A linear baroclinic model simulation reproduced the observed north-south circulation system reasonably well and supports the diagnostic analysis. Quasi-geostrophic vertical pressure velocity diagnostics were used to quantify the contributions to the north-south circulation system made by large-scale adiabatic forcing and diabatic heating (Q). The results indicated that the north-south circulation system is induced mainly by diabatic heating related to precipitation over southern China, and the effect of large-scale circulation is negligible. These results provide the basis for a more comprehensive understanding of the mechanisms that drive the formation of haze over the NCP.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000747493500001
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/273055
作者单位	Ocean University of China; Ocean University of China; Chinese Academy of Sciences; Institute of Atmospheric Physics, CAS
推荐引用方式 GB/T 7714	An, Xiadong,Sheng, Lifang,Li, Chun,et al. Effect of rainfall-induced diabatic heating over southern China on the formation of wintertime haze on the North China Plain[J],2022,22(2):14.
APA	An, Xiadong,Sheng, Lifang,Li, Chun,Chen, Wen,Tang, Yulian,&Huangfu, Jingliang.(2022).Effect of rainfall-induced diabatic heating over southern China on the formation of wintertime haze on the North China Plain.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(2),14.
MLA	An, Xiadong,et al."Effect of rainfall-induced diabatic heating over southern China on the formation of wintertime haze on the North China Plain".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.2(2022):14.