| 华南季风低压暴雨及其结构分析 |
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| 引用本文： | 蒋建莹,江吉喜,布亚林,刘年庆.华南季风低压暴雨及其结构分析[J].气象学报,2007,65(4):537-549. |
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| 作者姓名： | 蒋建莹 江吉喜 布亚林 刘年庆 |
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| 作者单位： | 1. 国家卫星气象中心,北京,100081
2. 河南省专业气象台,郑州,450003 |
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| 摘 要： | 文中对2005年夏季华南的一次季风低压大暴雨过程进行了诊断分析,讨论了该季风低压的三维结构,并将其与南亚季风低压和梅雨锋上低压系统的结构进行了对比分析。结果表明,这次暴雨过程由华南季风低压直接引起,造成大暴雨的季风低压产生在有利的大尺度环流背景下。这次华南季风低压的三维结构特征为:在水平方向上,季风低压的南侧是一条对流云带,在对流层中低层,季风低压基本上处于对流不稳定并伴随有较强的上升运动;它对应中低层的湿舌、辐合区和很强的正涡度带。在垂直方向上,季风低压在对流层中低层有明显的气旋性环流,在300 hPa以上无反映。它对应低层辐合和气旋性涡度,高层辐散和反气旋性涡度。季风低压的上升气流可达对流层高层,主要上升运动区位于低压的西侧,主要下沉运动区位于低压的东侧。季风低压南侧有低空急流存在,但高层急流并不明显;季风低压的热力结构为上暖下冷。华南季风低压的轴线随高度向东南方向倾斜。这种种特征,与南亚季风低压和梅雨锋低压均有较大不同。
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| 关 键 词： | 季风低压 暴雨 结构. |
| 修稿时间： | 2006年9月6日 |
HEAVY RAINFALL ASSOCIATED WITH MONSOON DEPRESSION IN SOUTH CHINA: STRUCTURE ANALYSIS |
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| Jiang Jianying,Jiang Jixi,Bu Yalin,Liu Nianqing.HEAVY RAINFALL ASSOCIATED WITH MONSOON DEPRESSION IN SOUTH CHINA: STRUCTURE ANALYSIS[J].Acta Meteorologica Sinica,2007,65(4):537-549. |
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| Authors: | Jiang Jianying Jiang Jixi Bu Yalin Liu Nianqing |
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| Abstract: | A heavy rainfall associated with the deepening of a monsoon depression happened in the summer of 2005.This process was first diagnosed and analysed and the 3-D structure of the monsoon depression was discussed,then this structure was compared with those of the monsoon depression in South Asia and the depression on the meiyu front.The results show that the heavy rainfall directly resulted from a monsoon depression in South China,and the large-scale environment provided a favorable background for the deepening of the monsoon depression.The 3-D structure of the monsoon depression is as follows: in the horizontal direction,there existed a convective cloud band to the south of the monsoon depression,which lay in a convectively unstable area with relatively strong ascending motion in the mid and low level of the troposphere,and the ascending motion matched well with the moist tongue,and the convergence and strong positive vorticity band in the mid and low level.In the vertical direction,the depression had an obviously cyclonic circulation in the mid and low level of the troposphere,but no cyclonic circulation above the 300 hPa.The monsoon depression corresponded to convergence and positive vorticity in the low level,but to divergence and negative vorticity in the upper level.The upward draft of the depression could reach the upper level of the troposphere in the west of the depression,while the descending motion lay in the east.There was a low-level jet to the south of the depression,while the upper-level jet was not obvious.The depression was vertically warm in the upper level and cold in the low level,and the axis of the depression tilted southeastwards with height,which characteristic is different not only from the monsoon depression in South Asia but also the depression in the meiyu front. |
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| Keywords: | Monsoon depression Structure Heavy rainfall |
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