| 江淮流域旱涝年夏季E-P通量特征分析 |
| |
| 引用本文： | 姚文清,徐祥德,冉令坤.江淮流域旱涝年夏季E-P通量特征分析[J].气象,2004,30(4):11-14. |
| |
| 作者姓名： | 姚文清 徐祥德 冉令坤 |
| |
| 作者单位： | 1. 中国气象科学研究院,北京,100081
2. 中国科学院大气物理研究所 |
| |
| 基金项目： | 由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"(NO2001CCB00400)资助. |
| |
| 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。
|
| 关 键 词： | E-P通量 江淮流域 旱、涝年 夏季降水 |
Characteristics of Summer Eliassen-Palm Flux in Drought/Flood Years of the Changjiang and Huaihe Valley |
| |
| Yao Wenqing,Xu Xiangde,Ran Lingkun.Characteristics of Summer Eliassen-Palm Flux in Drought/Flood Years of the Changjiang and Huaihe Valley[J].Meteorological Monthly,2004,30(4):11-14. |
| |
| Authors: | Yao Wenqing Xu Xiangde Ran Lingkun |
| |
| Institution: | Yao Wenqing 1 Xu Xiangde 1 Ran Lingkun 2 |
| |
| 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. |
| |
| Keywords: | E-P flux the Changjiang and Huaihe valley drought/flood year summer rainfall |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《气象》浏览原始摘要信息 |
| 点击此处可从《气象》下载免费的PDF全文 |
