气候变化领域集成服务门户(CCPortal): Record-breaking high temperature in Southern China in 2017 and influence from the middle-latitude trough over the East of Japan

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DOI	10.1016/j.atmosres.2021.105615
	Record-breaking high temperature in Southern China in 2017 and influence from the middle-latitude trough over the East of Japan
	Zhang J.; Ding T.; Gao H.
发表日期	2021
ISSN	0169-8095
卷号	258
英文摘要	In midsummer (July-August) of 2017, the high temperature (HT) frequency in China breaks the record since 1951. For each HT threshold from 35 °C to 40 °C, the frequency is beyond the normal by 2.58–3.46 standard deviations. Specifically, the HT events in southern China make major contributions to the new record, and they demonstrate obvious temporal variations. The strongest episode in southern China appears in mid-to-late July and lasts for nearly 20 days. The westward extension and intensification of the western Pacific subtropical high (WPSH) is usually considered as the leading factor of the HT in southern China. However, the diagnostic analysis in this paper shows that the 2017 HT event does not correspond to the intensification of the whole WPSH but to its western part, and there is a cyclonic circulation anomaly over the western Pacific warm pool, which is closely related to the southward extension of the middle-latitude trough over the east side of Japan. This circulation pattern is favorable for the southward retreat of the WPSH northern boundary over the warm pool, which results in the shape change and even the split of the high. Then the west part of the high is incapable of withdrawing eastward, and it dominates over the southern China steadily, leading to the persistent HT events. This conclusion is further confirmed by the statistical analysis both of the multi-year circulations and the typical HT extreme case in 2013, which could provide reference for the sub-seasonal prediction of HT in southern China. © 2021 Elsevier B.V.
英文关键词	Extreme high temperature; Middle-latitude trough; Western Pacific subtropical high
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/236724
作者单位	Hunan Climate Center, Changsha, China; National Climate Center, China Meteorological Administration, Beijing, China
推荐引用方式 GB/T 7714	Zhang J.,Ding T.,Gao H.. Record-breaking high temperature in Southern China in 2017 and influence from the middle-latitude trough over the East of Japan[J],2021,258.
APA	Zhang J.,Ding T.,&Gao H..(2021).Record-breaking high temperature in Southern China in 2017 and influence from the middle-latitude trough over the East of Japan.Atmospheric Research,258.
MLA	Zhang J.,et al."Record-breaking high temperature in Southern China in 2017 and influence from the middle-latitude trough over the East of Japan".Atmospheric Research 258(2021).