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| 我国江淮地区平均场水汽输送与扰动场水汽输送的不同特征 | |
| 引用本文： | 朱玮,刘芸芸,何金海.我国江淮地区平均场水汽输送与扰动场水汽输送的不同特征[J].气象科学,2007,27(2):155-161. |
| 作者姓名： | 朱玮 刘芸芸 何金海 |
| 作者单位： | 1. 南京信息工程大学大气科学系,南京,210044;江苏省无锡市气象局,无锡,214101 2. 南京信息工程大学大气科学系,南京,210044 3. 南京信息工程大学大气科学系,南京,210044;江苏省气象科学研究所,南京210009 |
| 基金项目： | 国家重点基础研究发展计划(973计划);江苏省气象科学研究所研究基金共同资助项目 |
| 摘 要： | 利用NCEP／NCAR1957-2001年45a逐日的再分析资料，从地面开始积分计算整层的水汽输送通量，减去平均场的水汽的输送量，从而得到扰动水汽输送量，初步讨论了我国江淮地区水汽输送场的季节变化特征，并分析了我国江淮梅雨期旱、涝年平均场水汽输送与扰动场水汽输送的差异。分析发现：扰动场水汽输送与平均场水汽输送差别较大，源自孟加拉湾的平均水汽输送对我国东部地区的降水影响较大，但该地区的扰动水汽输送却主要是影响印度北部地区。而影响我国江淮地区的扰动场水汽输送主要来自于南海地区。源自西太平洋和我国北方的偏强的水汽输送是造成江淮梅雨期降水偏多的主要因子，扰动场水汽输送在我国江淮地区梅雨期降水异常时期与平均场水汽输送基本呈反方向输送，其差值散度场与平均场水汽输送差值散度则为反位相分布，因此说扰动场的水汽输送对平均场的水汽输送起削弱作用。 |
| 关 键 词： | 江淮地区 扰动水汽输送 梅雨期旱涝年 |
| 收稿时间： | 2005-09-15 |
| 修稿时间： | 2006-02-23 |
CHARACTERISTICS OF WATER VAPOR TRANSPORT IN AVERAGED FIELD AND ITS DIFFERENCE FROM THAT IN DISTURBED FIELD IN CHANGJIANG AND HUAIHE VALLEYS |
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| Zhu Wei,Liu Yunyun and He Jinhai.CHARACTERISTICS OF WATER VAPOR TRANSPORT IN AVERAGED FIELD AND ITS DIFFERENCE FROM THAT IN DISTURBED FIELD IN CHANGJIANG AND HUAIHE VALLEYS[J].Scientia Meteorologica Sinica,2007,27(2):155-161. | |
| Authors: | Zhu Wei Liu Yunyun and He Jinhai |
| Institution: | 1.Department of Atmospheric Science ,NUlST,Nanjing 210044;2.Wuxi Meteorological Bureau ,Wuxi 214101;3.Jiangsu Meteorological Institute ,Nanjing 210009 |
| Abstract: | In this paper,the NCEP/NCAR reanalysis data and the disturbance flux field of water vapor transport(the integration of whole atmospheric column above the ground minus its mean field) are used to analyze the seasonal variation of water vapor transport over the Changjiang and Huaihe River Valleys for the 1957-2001 period.Differences of moisture transfer during the Meiyu period between the droughts and floods years are also investigated.Results show that there are great differences between the mean vapor transfer field and the disturbance one.The mean water vapor transport from the Bay of Bengal greatly influences the precipitation in the eastern China,while the disturbance one from the same source exerts primary impacts on the district of the northern Indian.The disturbance moisture transport which affects the Changjiang and Huaihe Valleys is mainly from the South China Sea.The key factor responsible for positive precipitation anomaly over Changjiang and Huaihe Valleys is the intense moisture transport from both the western Pacific Ocean and the northern China.It is also revealed that disturbance water vapor transport weakens the mean one,because the disturbance transport direction is opposite to the climatologic mean and the divergence of disturbance field manifesting is out of phase compared with the mean one during the anomalous Meiyu rainfall period over Changjiang and Huaihe Valleys. |
| Keywords: | Changjiang and Huaihe Valleys Disturbance water vapor transport Meiyu period in the floods and droughts years |
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