| 江淮梅雨期降水异常分布型及其与东亚副热带高空西风急流的关系 |
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| 引用本文： | 李侃,余锦华,王元,宋金杰,庄园.江淮梅雨期降水异常分布型及其与东亚副热带高空西风急流的关系[J].气象科学,2018,38(3):302-309. |
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| 作者姓名： | 李侃 余锦华 王元 宋金杰 庄园 |
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| 作者单位： | 南京大学大气科学学院;南京信息工程大学 |
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| 基金项目： | 国家重点基础研究发展计划（973计划）项目（2015CB452800） |
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| 摘 要： | 利用1980—2010年的NCEP/NCAR再分析资料与江淮地区44个站逐日降水资料,分析了江淮地区1980—2010年梅雨期(6月16日—7月15日)降水的基本空间分布型及其与东亚副热带西风急流的关系。结果表明,江淮梅雨降水的第一分布型为"南正(负)北负(正)",该型受副热带高空西风急流位置的影响,急流位置偏南(北),则雨带位于江淮南(北)部地区;第二分布型为"中间负(正),两边正(负)",该型受副热带高空西风急流强度的影响,急流强度异常偏弱(强),则雨带位于江淮地区西北、东南部(中部)。合成分析表明,高空急流位置异常偏南时,500 h Pa副高偏弱、偏南,850 h Pa江淮南部地区为水汽、风场辐合区,高低空配置有利于降水呈"南正北负"的分布型。高空急流强度异常偏弱时,从我国江淮中东部地区至日本南部,500 h Pa上无明显垂直运动,850 h Pa上有水汽和风场的辐散区,高低空配置有利于降水呈"中间负,两边正"的分布型。
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| 关 键 词： | 江淮梅雨 东亚副热带高空西风急流 EOF |
| 收稿时间： | 2016/11/20 0:00:00 |
| 修稿时间： | 2017/5/24 0:00:00 |
Abnormal distribution of Meiyu precipitation over Jianghuai region and its relation with East Asia subtropical westerly jet |
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| LI Kan,YU Jinhu,WANG Yuan,SONG Jinjie and ZHUANG Yuan.Abnormal distribution of Meiyu precipitation over Jianghuai region and its relation with East Asia subtropical westerly jet[J].Scientia Meteorologica Sinica,2018,38(3):302-309. |
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| Authors: | LI Kan YU Jinhu WANG Yuan SONG Jinjie and ZHUANG Yuan |
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| Institution: | School of Atmospheric Sciences, Nanjing University, Nanjing 210023, China,Nanjing University of Information Science & Technology, Nanjing 210044, China,School of Atmospheric Sciences, Nanjing University, Nanjing 210023, China,School of Atmospheric Sciences, Nanjing University, Nanjing 210023, China and School of Atmospheric Sciences, Nanjing University, Nanjing 210023, China |
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| Abstract: | By using NCEP/NCAR reanalysis data and daily precipitation data from 44 stations in Jianghuai region during Meiyu season (June 16-July 15) from 1980 to 2010, the distribution of Meiyu precipitation over Jianghuai region and its relation with East Asia subtropical westerly jet was studied. Results show that the first pattern is "south-positive (negative) and north-negative (positive)", which is influenced by the location of the westerly jet. When the jet is abnormally southward (northward), the rainbands locate over the south (north) of Jianghuai region. The second pattern is "middle-negative (positive) and sides-positive (negative)", which is influenced by the intensity of westerly jet. While the jet is abnormally weak (strong), the rainbands occur in the northwest and southeast (center) of Jianghuai region. Synthetic analysis shows that, for an abnormally southerly jet location, the 500 hPa subtropical high is weaker and the location is far southward, 850 hPa has a convergence zone for water vapor and wind field over Jianghuai region, which can easily lead to the distribution of the "south-positive and north-negative" type. When the intensity is abnormally weak, from the central and eastern Jianghuai region to the southern Japan, 500 hPa has no obvious vertical motion, water and wind field diverge at 850 hPa, which favor the formation of "middle-negative and sides-positive" type. |
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| Keywords: | Jianghuai Meiyu East Asia subtropical westerly jet EOF |
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