| 东北地区春季冷锋云系降水个例数值模拟及机理研究 |
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| 引用本文： | 马国忠,银燕,王秋京.东北地区春季冷锋云系降水个例数值模拟及机理研究[J].黑龙江气象,2010,27(4):4-8. |
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| 作者姓名： | 马国忠 银燕 王秋京 |
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| 作者单位： | [1]黑龙江省气象台,黑龙江哈尔滨150030 [2]南京信息工程大学,江苏南京210044 [3]黑龙江省气象科学研究所,黑龙江哈尔滨150030 |
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| 摘 要： | 本文通过常规天气资料,结合WRF中尺度数值模式,深入研究了2007年5月22～24日一次发生在东北地区的锋面云系降水过程和云宏微观结构特征以及降水产生的物理机制。模拟结果表明冷锋云系降水分布不均匀,锋前中低层有弱的上升气流,云水比含水量较大,雪和霰几乎没有。冷锋过境时,垂直速度迅速增大,中低层有下沉气流,不利于云水形成,出现云水含量几乎没有的干层区,雪水比含水量迅速增加,降水形成应是通过雪和霰的融化过程。处于锋区时,垂直速度和雪比含水量继续增大,降水的形成主要是雪的融化过程。锋后,上升气流迅速减弱,云内雪比含水量减少,降水的形成主要是雪的融化和暖云微物理过程。
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| 关 键 词： | 中尺度数值模式 双参数微物理方案 冷锋 春季降水 |
Mechanism and Numerical Simulating Study of the Cold Front Precipitation in Northeast China |
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| Ma Guo-zhong,Yin Yan,Wang Qiu-jing.Mechanism and Numerical Simulating Study of the Cold Front Precipitation in Northeast China[J].Heilongjiang Meteorology,2010,27(4):4-8. |
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| Authors: | Ma Guo-zhong Yin Yan Wang Qiu-jing |
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| Institution: | 1. Heilongjiang Provincial Meteorological Observatory, Heilongjiang Harbin 150030;2. NUIST Atmospheric Physics and Key Laboratory of Atmospheric Environment, Jiangsu Nanjing 210044;3. Heilongjiang Institute of Meteorolagical Sciences, HeiLongjiang Harbinl50030) |
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| Abstract: | This Paper analyses some characteristics of the macro- and micro-physical structures and mechanisms of a case of cold front cloud on May 22-24,in 2007,by using different observational data and the middle scale numerical simulation models WRF, Simulated cold front showed that before the front has the weak upflow on the middle-layer, there are lot cloud water and little of snow and graupel. When cold front transit the vertical velocity increases very quickly. Downdraft in the lower level which is not conducive to the formation of cloud water. The precipitation was generated by snow and graupel melted process. When in the cold front vertical velocity and snow mixing ratio continue to increase. The precipitation was generated by snow melted. After the cold front the upflow weakens rapidly, the precipitation was generated by snow melted and worm Cloud process. |
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| Keywords: | Numerical simulation Morrison scheme cold front spring rain |
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