| 初夏至盛夏东亚副热带西风急流变化与江淮出梅的关系 |
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| 引用本文： | 董丽娜, 郭品文, 张福颖,.初夏至盛夏东亚副热带西风急流变化与江淮出梅的关系[J].大气科学学报,2010,33(1):74-81. |
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| 作者姓名： | 董丽娜 郭品文 张福颖 |
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| 作者单位： | 南京信息工程大学气象灾害省部共建教育部重点实验室; 南京信息工程大学大气科学学院; |
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| 基金项目： | 国家自然科学基金重点资助项目(40675041) |
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| 摘 要： | 利用1961—2005年逐候资料对东亚副热带西风急流初夏至盛夏变化与江淮出梅的关系进行了分析。结果表明,多年平均7月初夏至盛夏急流中心由西太平洋地区西跳至青藏高原的同时我国东部地区急流北跳至37.5°N以北,比梅雨结束早1候;急流北跳使得我国东部高空强辐散中心北移至华北地区,江淮地区上空辐散显著减弱,上升运动减弱,从而使得江淮梅雨结束,雨带北移;而急流中心的西跳仅使得我国东部地区高空辐散中心减弱,降水减弱,有利于雨带北移。我国东部急流北跳与江淮地区梅雨结束时间显著正相关,在北跳偏早(晚)年份梅雨结束早(晚),长江中下游地区降水偏少(多),而急流中心西跳早晚对我国华北北部地区和淮河附近地区降水有较大影响。可见,我国东部急流北跳与梅雨结束关系密切,可作为梅雨结束的先期信号。
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| 关 键 词： | 东亚副热带西风急流 初夏至盛夏变化特征 江淮出梅 |
| 收稿时间： | 2009/1/15 0:00:00 |
| 修稿时间： | 2009/7/10 0:00:00 |
Relationship between Variations of East Asian Subtropical Westerly Jet from Early Summer to Midsummer and Withdrawal of Mei-Yu from Jianghuai Region |
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| DONG Li-na; ; GUO Pin-wen; ZHANG Fu-ying.Relationship between Variations of East Asian Subtropical Westerly Jet from Early Summer to Midsummer and Withdrawal of Mei-Yu from Jianghuai Region[J].大气科学学报,2010,33(1):74-81. |
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| Authors: | DONG Li-na; ; GUO Pin-wen; ZHANG Fu-ying |
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| Institution: | 1.Key Laboratory of Meteorological Disaster of Ministry of Education; 2.School of Atmospheric Sciences; NUIST; Nanjing 210044; China |
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| Abstract: | Based on the pentadly averaged datasets from 1961 to 2005 year,the relationship between the variations of the East Asian subtropical westerly jet(EASWJ) from early summer to midsummer and the withdrawal of Mei-Yu from the Jianghuai region are studied,with the results as follows:(1) during the transforming process of the EASWJ from early summer to midsummer,the westward jump of the jet core from the western Pacific to the Qinghai-Tibet Plateau,and the northward jump of the jet to the area north of 37.5°N ove... |
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| Keywords: | East Asian subtropical westerly jet variations of EASWJ from early summer to midsummer withdrawal of Mei-Yu from the Jianghuai region |
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