【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。更多还原

【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.更多还原