| 昭通市一次大范围暖区暴雨天气过程分析 |
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| 作者姓名： | 沈茜 |
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| 作者单位： | 昭通市气象局 |
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| 基金项目： | 昭通市灾害性天气预报预警指标体系研究（ZTTQ201702） |
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| 摘 要： | 利用NCEP/NCAR 1°×1°再分析资料、昭通多普勒雷达资料 、自动站实时观测资料等,分析云南省昭通市夏季的一次伴有大范围短时强降水的暖区暴雨过程。结果表明：这是一次发生在有利的天气尺度背景下,由持续存在的地面辐合线触发抬升产生的暖区对流性降雨过程;这次过程的水汽来源于孟加拉湾、南海和西太平洋,同时700hPa水汽输送与降水的落区和量级密切相关,水汽输送越好,降雨量级越大;长期维持的上干冷下暖湿的不稳定层结,配合有利的水汽条件和适当的物理量场导致了此次连续性强对流天气的发生;垂直上升速度的大值区和降雨量级的大值区并不是一一对应关系,可以用来表征降雨的状态,但是不能用来定量表征降雨量级;持续存在的“逆风区”有利于连续性的短时强降水的发生;昭通市低层偏东风辐合导致的暖区对流性降水过程中,地形的辐合抬升起到了重要的作用。
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| 关 键 词： | 短时强降水 暖区暴雨 多普勒雷达 |
| 收稿时间： | 2019/1/8 0:00:00 |
| 修稿时间： | 2019/7/30 0:00:00 |
Analysis of A Large Area Warm-Sector Rainstorms Process in Zhaotong |
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| Authors: | SHEN Qian |
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| Institution: | meteorological Bureau of Zhaotong City,Zhaotong Yunnan 657000;China |
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| Abstract: | Based on the reanalysis data from NCEP/NCAR 1°*1°,Zhaotong Doppler weather radar data and the measured data from real-time automatic weather, the cause of a warm-sector rainstorms with large area of short time intensive precipitation in Yunnan Zhaotong is analyzed. The results showed that,this is a a warm-sector rainstorm process that occurs in the favorable weather scale background and is triggered by the continuous ground convergence. The water vapor comes from the Bay of Bengal, the South China Sea and the Western Pacific. It is related to the area and magnitude of precipitation closely, the better the water vapor is, the bigger the rainfall is. Long-term maintenance of the unstable layer that up and cold and warm and wet and cooperate with favorable water vapor, suitable physical fields can lead to this continuous convective weather. The large area of vertical rising speed and falling rain are not one-to-one relations, it can be used to describe the state of rainfall, but it can not be used to quantify the magnitude of rainfall. A continuously "Adverse Wind Regions" is conducive to the short time intensive precipitation occurs. The convergence of terrain plays an important role in the convective rainfall of warm sector which is caused by easterly air in Zhaotong. |
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| Keywords: | short time intensive precipitation warm-sector rainstorm doppler weather radar |
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