| 湿位涡与锋面强降水天气的三维结构 |
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| 引用本文： | 刘还珠,张绍晴.湿位涡与锋面强降水天气的三维结构[J].应用气象学报,1996,7(3):275-284. |
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| 作者姓名： | 刘还珠 张绍晴 |
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| 作者单位： | 1.国家气象中心 |
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| 基金项目： | 国家“85－906－03”课题资助 |
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| 摘 要： | 湿位涡（MPV）给出了大气短期行为的热力状态和涡旋运动之间的约束关系，这种关系导致了强降水这样的天气现象中涡旋爆发性增长的重要机制，它的大小与大气层结的状态、斜压性以及风的垂直切变有关，其正负符号取决这三者的配置。文章分析指出500 hPa上MPV1零线或0～20（0.1 PVU）的区域可作为强降水区的后界（西北界）。锋面南侧暖湿对流不稳定层结大气中，在对流层700 hPa及以下的中低层（低空急流之上）。存在着向东的正涡度环流对应MPV2的正值中心，该中心北部对应强降水区，而锋面北侧的对流稳定层结大气中，
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| 关 键 词： | 倾斜性涡度发展 湿位涡 锋面三维结构 强降水 |
Moist Potential Vorticity and the Three Dimensional Structure of a Cold Front with Heavy Rainfall |
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| Liu Huanzhu,Zhang Shaoqing.Moist Potential Vorticity and the Three Dimensional Structure of a Cold Front with Heavy Rainfall[J].Quarterly Journal of Applied Meteorology,1996,7(3):275-284. |
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| Authors: | Liu Huanzhu Zhang Shaoqing |
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| Affiliation: | 1.(National Meteorological Center, Beijing 100081) |
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| Abstract: | Under the constrain of conservation of moist potential vorticity (MPV), vertical vorticity may develop explosively (slantwise vorticity development) and result in severe weather such as torrential rainfall. MPV is related with stability, baroclinity and vertical wind shear. Its symbol (positive or negative) is determined by their allocation. In the middle troposphere (at about 500 hpa) t the region with negative vertical component of MPV. i. e.MPV1<0, is a transition region between cold dry air and warm moist air. The zero isopleth of MPV1 or the region between 0 and 20 (0. 1 PVU) can be considered as the northwest limit of a torrential rain area. The horizontal component of MPV, i. e. MPV2 , is determined by moist baroclinity and vertical wind shear. To the south of the front, air is convectively unstable. Positive MPV2 centre can appear above the lower-lever jet, and terrential rain may occur in the region north of the centre. To the north of the front, air is convectively stable, negative MPV2 centre can appear below the upper-lever jet, and heavy rainfall may occur in the region south of the centre. The vertical circulation and the three dimensional thermal structure across the front region are given. |
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| Keywords: | Slantwise vorticity development Moist potential vorticity Three dimensional structure of front Torrential rainfall |
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