| 2003年江淮流域强降水过程与30—70d天低频振荡的联系 |
| |
| 引用本文： | 夏芸,管兆勇,王黎娟.2003年江淮流域强降水过程与30—70d天低频振荡的联系[J].南京气象学院学报,2008,31(1):33-41. |
| |
| 作者姓名： | 夏芸 管兆勇 王黎娟 |
| |
| 作者单位： | 南京信息工程大学,大气科学学院,江苏,南京,210044;南京信息工程大学,江苏省气象灾害重点实验室,江苏,南京,210044 |
| |
| 基金项目： | 国家重点基础研究发展计划(973计划)
,
江苏省自然科学基础研究项目 |
| |
| 摘 要： | 利用NCEP／NCAR再分析和地面观测站的逐日降水资料，研究了2003年夏季江淮流域强降水过程与低频振荡的联系。结果显示，主周期为30～70d的低频振荡对2003年江淮流域暴雨的形成具有重要贡献：低频涡旋在江淮地区降水期的对流层高、低层呈负、正配置，具有斜压结构，利于降水发生；850hPa上正涡度系统的传播具有明显的北传和西传特征；存在于西太平洋、西北太平洋及其以东地区的低频波列（P—J）的活动过程影响了我国2003年江淮低频强降水的形成；整层低频水汽通量显示来自副热带高压外围的西南季风对水汽输送的贡献较显著，且2003年江淮地区30-70d时间尺度上降水的水汽来源为南海而非孟加拉湾或西太平洋。
|
| 关 键 词： | 2003年江淮暴雨 30~70 d低频振荡 水汽输送 东亚夏季风 |
| 文章编号： | 1000-2022（2008）01-0033-09 |
| 收稿时间： | 2006-11-23 |
| 修稿时间： | 2007-04-10 |
Association of 30-70d Oscillations with the Heavy Rainfall over Changjiang-Huaihe River Valley in Summer 2003 |
| |
| XIA Yun,GUAN Zhao-yong,WANG Li-Juan.Association of 30-70d Oscillations with the Heavy Rainfall over Changjiang-Huaihe River Valley in Summer 2003[J].Journal of Nanjing Institute of Meteorology,2008,31(1):33-41. |
| |
| Authors: | XIA Yun GUAN Zhao-yong WANG Li-Juan |
| |
| Institution: | XIA Yun, GUAN Zhao-yong ,WANG Li-Juan (1. School of Atmospheric Sciences,NUIST,Nanjing 210044,China; 2. Jiangsu Key Laboratory of Meteorological Disaster, NUIST, Nanjing 210044, China) |
| |
| Abstract: | Using the NCEP/NCAR reanalysis and in situ precipitation daily data in 2003, association of 30--70 d oscillations with the heavy rain over the Changjiang-Huaihe River Valley in the summer of 2003 has been studied in the present paper. The results show that the 30--70 d oscillations had important contributions to the total precipitation in the summer of 2003. The low frequency circulation showed a baroclinic structure with the positive vorticitiy in the lower troposphere, and the negative one in the upper troposphere during the torrential rain period, and 850 hPa positive vorticity was systematically transported northward and westward. The positive anomalies of precipitation over the Changjiang-Huaihe River valley were strongly influenced by the low frequency wave propagations（ P--J）over the west and northwest Pacific regions. Water vapor fluxes vertically integrated from the earth surface to the top of the troposphere on the 30--70 d time scale indicate that southwestly monsoon wind along the edge of the western Pacific subtropical anticyclone was responsible for the water transport, and the moisture is found to be transported from the South China Sea other than either the Bay of Bangle or the west Pacific. |
| |
| Keywords: | heavy rainfall in the Changjiang-Huaihe River Valley 2003 30-70 d oscillations water vapor transport East Asian summer monsoon |
| 本文献已被 维普 万方数据 等数据库收录！ |
