| 摘要: |
| 用点相关和SVD方法分析发现,长江中下游地区梅雨期降水的异常与前期(5月)和同期(6～7月)80～140°E,0～50°N区域附近的环流场的异常有关。当梅雨出现正(负)异常时,SVD分解的风场出现有利于(不利于)降水的主要分布模态。在用p-σ九层区域气候模式模拟初边条件的异常对梅雨降水的影响时,证实环流场异常对梅雨降水的影响比较显著。RegCM3模拟结果表明,1998年和1988年初边条件的异常对降水有明显的影响,长江流域的降水对此异常最为敏感。 |
| 关键词: 长江中下游梅雨 SVD分解 区域气候模式 数值模拟 |
| DOI： |
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| 基金项目:国家自然科学基金重点项目“江淮梅雨的年际和年代际变化规律及其机制研究”(No.40233037);面上项目“南亚高压和亚洲季风相互作用及其机理的研究”(No.40175021)资助 |
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| THE ANALYSIS AND NUMERICAL SIMULATION OF ATMOSPHERICCIRCULATION OF MEI-YU RAINFALL IN THE MID-LOWER REACHES OF THE CHANGJIANG RIVER |
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CHEN Yi-min, QIAN Yong-fu
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Department of Atmospheric Science, Nanjing University, Nanjing 210093 China
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| Abstract: |
| Using dot correlation and SVD analysis,the relation of Mei-yu rainfall in the mid-lower reaches of the Changjiang River and the atmospheric circulation abnormality in the region of 80～140 °E,0～50 °N in the early period(May) and current period(June and July) of Mei-yu is examined.When Mei-yu rainfall abnormally increases(decreases),wind field decomposed by SVD appears a leading distributing mode,which is(not) in favor of precipitation.Through simulating the effect of initial field's abnormality on Mei-yu rainfall by a P-σ nine-layer regional climate model,it is tested that air circulation has a distinct influence on Mei-yu rainfall.The simulative results of RegCM3 confirm that the initial and boundary fields of 1998 and 1988 have a notable effect on precipitation.Moreover,the precipitation in the region of Changjiang River is greatly affected. |
| Key words: Mei-yu rainfall in the mid-lower reaches of the Changjiang river SVD analysis regional climate model numerical simulation |
