江淮流域旱涝年夏季E-P通量特征分析被引量：5

Characteristics of Summer Eliassen-Palm Flux in Drought/Flood Years of the Changjiang and Huaihe Valley

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摘要利用 1 958～ 1 997年NCAR/NCEP全球再分析资料和 1 951～ 1 998年全国 1 6 0站月降水资料研究了江淮流域旱涝年夏季E P通量的分布状况 ,旱年E P通量在4 0°N附近呈强辐合特征 ,涝年在 30°N附近呈强辐合特征 ,其分布形式与降水的对应关系显著。旱涝年E P通量不同的分布形式促使江淮流域旱年 4 0°N附近的高空西风急流得到加强 ,涝年 30°N附近的高空西风急流得到加强 ,使得相应地区的风场高层辐散、低层辐合得到加强 ,形成了有利于降水生成的动力条件 ,是江淮流域及中国区域不同形式的降水分布形成的重要因素。 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.

作者姚文清徐祥德冉令坤

机构地区中国气象科学研究院中国科学院大气物理研究所

出处《气象》 CSCD 北大核心 2004年第4期11-14,共4页 Meteorological Monthly

基金基础研究重大项目前期研究专项"东亚季风科学实验预研究"(NO2 0 0 1CCB0 0 4 0 0 )资助

关键词旱涝月降水资料 E-P通量江淮流域大气动力学 E-P flux the Changjiang and Huaihe valley drought/flood year summer rainfall

分类号 P338.6 [天文地球—水文科学]

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1丁一汇.天气动力学中的诊断分析方法[M].中国科技大学研究生院,1993.11-12.
2黄荣辉.冬季格陵兰高原对北半球定常行星波形成的作用[J].大气科学,1983,7:393-402.
3高守亭,陶诗言,丁一汇.表征波与流相互作用的广义E-P通量[J].中国科学（B辑）,1989(7):774-784. 被引量：12
4Eliassen, A and Palm, E. On the transfer of energy in stationary mountain waves, Geofy. Publikasjoner, 1961,22:1-23.
5Andrews, D G and McIntyre, M E. Planetary waves in horizontal and vertical shear: the beneralized Eliassen-Palm relation and the mean zonal acceleration. J Atmos Sci, 1976,33:2031-2048.
6Andrews, D G and McIntyre, M E. An exact theory of nonlinear waves on a Lagrangian-mean flow. J Fluid Mech. 1978,89:609-646.
7Andrews, d G. A finite-amplitude Elias,sen-Palm theorem in isentropic coordinates. J Atmos Sci, 1983, 40:1877-1883.
8Edmon, H G Hoskins, B J and McIntyre, M E,Eliassen-Palm cross sections for the troposphere, J Atmos Sci, 1980,37:2600-2615.
9Wu Guoxiong and Chen Biao. Non-acceleration theorem in a primitive equation system: Ⅰ Acceleration of Zonal Mean Flow. Advances in Atmospheric Sciences, 1989, 6: 1-20.
10Yang, H., Tung, K K and Olaguer, E. Nongeostrophie theory of zonally averaged circulation, Part Ⅱ: Eliassen-Palm flux divergence and isentropic mixing coefficient.J Atmos Sci. 1990,47:215-241.