气候变化领域集成服务门户(CCPortal): Interdecadal variation in the frequency of extreme hot events in Northeast China and the possible mechanism

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DOI	10.1016/j.atmosres.2020.105065
	Interdecadal variation in the frequency of extreme hot events in Northeast China and the possible mechanism
	Hong H.; Sun J.; Wang H.
发表日期	2020
ISSN	0169-8095
卷号	244
英文摘要	Based on the daily maximum temperature data from Chinese metrological stations, the frequency of extreme hot event (EHE) in Northeast China (NEC) over the period from 1960 to 2018 is investigated. The results show that the EHE frequency in summer (June and July) experienced a significant interdecadal increase around the mid-1990s. The analysis of the possible mechanism indicates that the interdecadal strength of the summer geopotential height in the mid-to-upper troposphere over the Mongolian region could be directly responsible for the interdecadal increase in the NEC EHE frequency. The enhanced geopotential height can weaken the subtropical East Asian westerly jet and lead to anomalous convergence and subsidence over NEC. Consequently, there were less cloud cover, favoring more incoming short-wave solar radiation to warm the land surface of NEC. Under such a background, there are more outgoing sensible heat, latent heat, and long-wave radiation from the land surface to warm the overlying atmosphere, favoring more EHE frequency over NEC. Further analysis indicates that the interdecadal variation in the summer geopotential height over the Mongolian region is related to a barotropic stationary Rossby wave train at the midlatitude from the North Atlantic to East Asia. Dynamic diagnosis and numerical simulation both suggest that the Atlantic Multidecadal Oscillation (AMO) can excite the pronounced Rossby wave train and further influence the interdecadal change in the geopotential height over the Mongolian region, finally contributing to the interdecadal increase in the NEC EHE frequency around the mid-1990s. © 2020 Elsevier B.V.
关键词	Surface measurement Atlantic multidecadal oscillations Dynamic diagnosis Geo-potential heights Inter-decadal variations Interdecadal changes Long-wave radiation Maximum temperature Possible mechanisms Mechanical waves Atlantic Multidecadal Oscillation decadal variation extreme event frequency analysis geopotential heat wave Rossby wave Mongolia
语种	英语
来源机构	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/132403
推荐引用方式 GB/T 7714	Hong H.,Sun J.,Wang H.. Interdecadal variation in the frequency of extreme hot events in Northeast China and the possible mechanism[J]. Atmospheric Research,2020,244.
APA	Hong H.,Sun J.,&Wang H..(2020).Interdecadal variation in the frequency of extreme hot events in Northeast China and the possible mechanism.,244.
MLA	Hong H.,et al."Interdecadal variation in the frequency of extreme hot events in Northeast China and the possible mechanism".244(2020).