ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Characteristics of Summer Eliassen-Palm Flux in Drought/Flood Years of the Changjiang and Huaihe Valley
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Abstract:
Based on NCEP/NCAR reanalysis data(1958-1997) and monthly-mean rainfall data(1951-1998) at 160 stations, the characteristics of summer Eliassen-Palm (E-P) flux in drought/flood years of the Changjiang and Huaihe valley are analyzed. Results indicate that the E-P flux show strong convergence at the regions of 40°N (30°N) in drought (flood) years, which is in well consistent with rainfall distributions. The different distributions of E-P flux in drought/flood years lead to the enhanced upper level westerly jet in the vicinity of 40°N (30°N) in drought(flood) years and further to the enhanced wind field divergence in the upper level and convergence in the lower level at the corresponding region which is favorable to the formation of rainfall and is an important factor for the distributions of rainfall in the Changjiang and Huaihe valley and in China.
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