| 一次广州大暴雨的环境条件及中小尺度特征分析 |
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| 引用本文： | 叶爱芬,伍志方,李怀宇.一次广州大暴雨的环境条件及中小尺度特征分析[J].气象科学,2012,32(2):202-209. |
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| 作者姓名： | 叶爱芬 伍志方 李怀宇 |
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| 作者单位： | 广州中心气象台,广州,510080 |
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| 基金项目： | 广东省科技厅社会发展气象领域科技计划项目(200907) |
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| 摘 要： | 基于常规观测资料、NCEP1°×1°再分析资料和广州多普勒天气雷达资料,对2010年5月14—15日广州大暴雨的环境条件、散度涡度场和中小尺度特征等进行了分析。结果表明:大暴雨过程中低层辐合高层辐散,促进气旋式涡度增加,上升运动增强,反之亦然;中层波动使得中低层辐合和中高层辐散更加深厚,进一步增强上升运动。粤西南暖湿气流北上受弱冷空气阻挡在广东省中北部地区堆积,为大暴雨提供水汽和能量。南下的弱冷空气和日变化共同形成地面强能量锋,与辐合线和低层切变线组成强有力的触发抬升机制。大暴雨期间多普勒天气雷达及时捕捉到逆风区、弱中气旋、中尺度辐合带和中层两次波动影响,分别对应两个强降水时段。
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| 关 键 词： | 大暴雨 地面能量锋区 中尺度辐合系统 |
| 收稿时间： | 2010/10/19 0:00:00 |
| 修稿时间： | 2010/12/17 0:00:00 |
Analysis on environmental conditions and meso-microscale characteristics of a rainstorm in Guangzhou |
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| YE Aifen,WU Zhifang and LI Huaiyu.Analysis on environmental conditions and meso-microscale characteristics of a rainstorm in Guangzhou[J].Scientia Meteorologica Sinica,2012,32(2):202-209. |
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| Authors: | YE Aifen WU Zhifang and LI Huaiyu |
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| Institution: | Guangzhou Central Meteorological Observatory, Guangzhou 510080, China;Guangzhou Central Meteorological Observatory, Guangzhou 510080, China;Guangzhou Central Meteorological Observatory, Guangzhou 510080, China |
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| Abstract: | Based on the conventional observational data,NCEP 1°×1°reanalyzed data and Doppler weather radar data, the environmental conditions and meso-microscale characteristics of the torrential rainfall in Guangzhou during May 14-15 were analyzed.The results showed that strong convergences at lower levels and strong divergence at upper levels contributed to enhance of cyclonic vorticities and ascending motions,or vice versa. Middle level fluctuations also helped strengthen convergence at low-middle levels,divergence at high-middle levels and then the ascending motion. High energy airs from southwest of Guangdong were hindered by cold airs and blocked in the middle and northern parts of Guangdong to provide water vapor and energies for rainstorms. The strong surface energy front formed by weak cold air advancing south and its daily variation, combined together with surface convergence line and wind shear line at low levels provided strong trigger mechanisms jointly. Doppler weather radar could detect the adverse wind regions,weak meso-cyclone, meso-scale convergence line and twice middle-level fluctuations, which are easier to reveal two precipitation stages. |
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| Keywords: | Rainstorms Surface energy front Mesoscale convergence system |
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