DOI: 10.1002/2014JD021965
论文题名: Spatial and temporal characteristics of warm season convection over Pearl River Delta region, China, based on 3 years of operational radar data
作者: Chen X. ; Zhao K. ; Xue M.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 2169897X
出版年: 2014
卷: 119, 期: 22 起始页码: 12447
结束页码: 12465
语种: 英语
英文关键词: convective features
; Doppler radar
; Pearl River Delta
; warm season
Scopus关键词: atmospheric convection
; coastal zone
; mountain environment
; oligotrophic environment
; precipitation (climatology)
; radar altimetry
; spatiotemporal analysis
; wind field
; China
; China
; Guangdong
; Zhujiang Delta
英文摘要: This study examines the temporal and spatial characteristics and distributions of convection over the Pearl River Delta region of Guangzhou, China, during the May-September warm season, using, for the first time for such a purpose, 3 years of operational Doppler radar data in the region. Results show that convective features occur most frequently along the southern coast and the windward slope of the eastern mountainous area of Pearl River Delta, with the highest frequency occurring in June and the lowest in September among the 5 months. The spatial frequency distribution pattern also roughly matches the accumulated precipitation pattern. The occurrence of convection in this region also exhibits strong diurnal cycles. During May and June, the diurnal distribution is bimodal, with the maximum frequency occurring in the early afternoon and a secondary peak occurring between midnight and early morning. The secondary peak is much weaker in July, August, and September. Convection near the coast is found to occur preferentially on days when a southerly low-level jet (LLJ) exists, especially during the Meiyu season. Warm, moist, and unstable air is transported from the ocean to land by LLJs on these days, and the lifting along the coast by convergence induced by differential surface friction between the land and ocean is believed to be the primary cause for the high frequency along the coast. In contrast, the high frequency over mountainous area is believed to be due to orographic lifting of generally southerly flows during the warm season. ©2014. American Geophysical Union. All Rights Reserved. 资助项目: 41275031
; 41322032
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63039
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Key Laboratory for Mesoscale Severe Weather/MOE, School of Atmospheric Science, Nanjing University, Nanjing, China; Center for Analysis and Prediction of Storms, School of Meteorology, University of Oklahoma, Norman, OK, United States
Recommended Citation:
Chen X.,Zhao K.,Xue M.. Spatial and temporal characteristics of warm season convection over Pearl River Delta region, China, based on 3 years of operational radar data[J]. Journal of Geophysical Research Atmospheres,2014-01-01,119(22)