黄安丽,高坤,李毓芳. 1987. 一次梅雨暴雨过程的数值模拟[J]. 气象学报, 45(4):426-436, doi:10.11676/qxxb1987.055
一次梅雨暴雨过程的数值模拟
A PRELIMINARY SIMULATION OF A HEAVY RAIN PROCESS DURING MEIYU SEASON
投稿时间:1985-02-15  修订日期:1986-04-18
DOI:10.11676/qxxb1987.055
中文关键词:  
英文关键词:
基金项目:
作者单位
黄安丽 杭州大学地理系 
高坤 杭州大学地理系 
李毓芳 杭州大学地理系 
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中文摘要:
      利用中尺度10层湿模式对一次梅雨暴雨过程作了数值模拟,较好地模拟了次天气或中间尺度系统的演变。由模拟结果分析表明:1.形成暴雨的次天气或中间尺度系统的演变,雨带、暴雨中心位置和强度变化在低层涡度场上反映最清晰。与暴雨中心直接关联的是低层正涡度中心。这次过程中,两次正涡度中心的东移形成了前、后两次降水。2.当低层正涡度中心移近或叠置在高层负涡度中心之下时,其强度增强,中层上升运动与暴雨也加强。它们是流场上高、低空急流之间动力耦合作用的结果。3.雨区上空,边界层顶附近存在着一个主要表现为湿度逆增的湿暖盖——θse高值中心。它与强风暴中的暖盖不同。此湿暖盖的形成和维持与西南急流输送暖湿气流有关。它的存在不仅有利于暴雨区水汽和能量的辐合,还有利于积云尺度对流的不断诱发,而且它的存在更构成了中层为不稳定,低层为稳定这一对流层的层结结构特点,从而使不稳定的对流降水叠加在稳定性降水之上,构成了梅雨锋大暴雨。
英文摘要:
      A 10-layer moist mesoscale model has been employed to simulate a heavy rain case over the Yangtse valley during Meiyu season.The structures and evolutions of subsynoptic or medium scale systems are well simulated.Thp results are as follows:1.The low-level vorticity,the evolution of subsynoptic or medium scale systems are closely associated with heavy rain.Peaks of 3-h precipitation developed and moved along with the vorticity maximum center.2.The vorticity maximum at lower level intensified while it moved near or under the center of negative vorticity at the upper level,concurrently,the upward motion and the amount of precipitation Was amplified.3.A warm moist lid existed by the top of PBL over rainfall area the inversion of moisture was main feature of the lid,characterized by a maximun of.θseThe formation and mentainance of the lid were related to the transformation of warm and moist flow by south-west LLJ.
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