DOI: 10.1007/s00382-014-2172-y
Scopus记录号: 2-s2.0-84939881062
论文题名: Relationship between summer rainfall anomalies and sub-seasonal oscillations in South China
作者: Li C. ; Li T. ; Lin A. ; Gu D. ; Zheng B.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2014
卷: 44, 期: 2017-01-02 起始页码: 423
结束页码: 439
语种: 英语
英文关键词: Interannual variation of summer rainfall
; Intraseasonal oscillation
; Quasi-biweekly oscillation
英文摘要: Sub-seasonal variability of summer (May–October) rainfall over South China exhibits two dominant timescales, one with a quasi-biweekly (QBW) period (10–20 days) and the other with an intraseasonal oscillation (ISO) period (20–60 days). A significant positive correlation (at a 99 % confidence level) was found between the summer precipitation anomalies and the intensity of the QBW and ISO modes. By examining the composite structure and evolution characteristics, we note that the QBW and ISO modes are characterized by a northwest-southeast oriented wave train pattern with a pronounced baroclinic vertical structure, moving northwestward. A marked feature is the phase leading of low-level moisture relative to convection. For the QBW mode, such a phase leading feature appears in both the strong and weak composites. However, for the ISO mode, this feature is only clearly seen in the strong composite. The high positive correlation between the summer precipitation and the sub-seasonal variability suggests that the summer mean state may exert a large-scale control on the sub-seasonal modes. It is found that when South China is anomalously wet, large-scale atmospheric conditions in the key QBW/ISO activity region are characterized by deeper moist layer, more convectively unstable stratification, and greater ascending motion. Such environmental conditions favor the growth of the QBW and ISO perturbations. © 2014, Springer-Verlag Berlin Heidelberg. 资助项目: NSFC, National Natural Science Foundation of China
; NSFC, National Natural Science Foundation of China
; NSFC, National Natural Science Foundation of China
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54451
Appears in Collections: 过去全球变化的重建
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作者单位: Institute of Tropical and Marine Meteorology/Guangdong Provincial Key Laboratory of Regional Numerical Weather Prediction, China Meteorological Administration, Guangzhou, China; IPRC and Department of Meteorology, University of Hawaii, Honolulu, HI, United States
Recommended Citation:
Li C.,Li T.,Lin A.,et al. Relationship between summer rainfall anomalies and sub-seasonal oscillations in South China[J]. Climate Dynamics,2014-01-01,44(2017-01-02)