DOI: 10.1002/2017JD028106
Scopus记录号: 2-s2.0-85044863196
论文题名: The Relationship Between Anomalous Presummer Extreme Rainfall Over South China and Synoptic Disturbances
作者: Huang L. ; Luo Y. ; Zhang D.-L.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 7 起始页码: 3395
结束页码: 3413
语种: 英语
英文关键词: extreme precipitation episodes
; presummer rainy season
; south China
; synoptic disturbances
Scopus关键词: environmental disturbance
; episodic event
; extreme event
; precipitation intensity
; rainfall
; Rossby wave
; seasonal variation
; spectral analysis
; synoptic meteorology
; temperature anomaly
; troposphere
; trough
; China
; Pacific Ocean
; Qinghai-Xizang Plateau
; South China Sea
英文摘要: A spectral analysis of daily rainfall data has been performed to investigate extreme rainfall events in south China during the presummer rainy seasons between 1998 and 2015 (excluding 1999, 2006, 2011, and 2014). The results reveal a dominant frequency mode at the synoptic scale with pronounced positive rainfall anomalies. By analyzing the synoptic-scale bandpass-filtered anomalous circulations, 24 extreme rainfall episodes (defined as those with a daily rainfall amount in the top 5%) are categorized into “cyclone” (15) and “trough” (8) types, with the remaining events as an “anticyclone” type, according to the primary anomalous weather system contributing to each extreme rainfall episode. The 15 cyclone-type episodes are further separated into (11) lower- and (4) upper-tropospheric migratory anomalies. An analysis of their anomalous fields shows that both types could be traced back to the generation of cyclonic anomalies downstream of the Tibetan Plateau, except for two episodes of lower-tropospheric migratory anomalies originating over the South China Sea. However, a lower-tropospheric cyclonic anomaly appears during all phases in the former type, but only in the wettest phase in the latter type, with its peak disturbance occurring immediately beneath an upper-level warm anomaly. The production of extreme rainfall in the trough-type episodes is closely related to a deep trough anomaly extending from an intense cyclonic anomaly over north China, which in turn could be traced back to a midlatitude Rossby wave train passing by the Tibetan Plateau. The results have important implications for understanding the origin, structure, and evolution of synoptic disturbances associated with the presummer extreme rainfall in south China. ©2018. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114098
Appears in Collections: 气候减缓与适应
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作者单位: State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing, China; Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing, China; Department of Atmospheric and Oceanic Science, University of Maryland, College Park, College Park, MD, United States
Recommended Citation:
Huang L.,Luo Y.,Zhang D.-L.. The Relationship Between Anomalous Presummer Extreme Rainfall Over South China and Synoptic Disturbances[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(7)