| 希热娜依·铁里瓦尔地,玛依热·艾海提,孟凡雪,胡素琴,孙雨,李建刚.南疆西部两次极端暴雨中尺度特征对比分析[J].沙漠与绿洲气象,2022,16(5):47~55 |
| 南疆西部两次极端暴雨中尺度特征对比分析 |
| Comparative Analysis on environmental conditions and m esoscale characteristics of Two Extreme Rainfall events in West of Southern Xinjiang |
| 投稿时间：2022-03-01 修订日期：2022-05-12 |
| DOI：10.12057/j.issn.1002-0799.2022.05.007 |
| 中文关键词: 南疆西部 极端暴雨 环境条件 中尺度特征 |
| 英文关键词:west of southern Xinjiang extreme rainfall environment condition mesoscale characteristics |
| 基金项目:新疆气象局科技创新发展基金(MS202222)；国家自然科学基金(41965002)；喀什地区科技计划项目(KS2021020)；喀什地区气象局课题(KS202209) |
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| 中文摘要: |
| 利用常规气象观测资料、地面区域气象站逐小时观测数据、NCEP再分析资料、FY-2G云顶亮温资料、喀什CR/CC雷达产品，对南疆西部两次极端暴雨中的短时强降水环境条件和中尺度特征进行对比分析。结果表明：两次过程均发生在500 hPa“东西夹攻”的有利环流背景下，100 hPa南亚高压分别呈东部型和双体型，低空急流、切变线和地面中尺度辐合线是两次强降水重要的触发系统。500 hPa低涡（低槽）自身携带的偏西局地水汽通道和700~850 hPa偏南、偏东两支水汽通道把充沛的水汽输送至暴雨区，为强降水的出现提供了有利的水汽条件，其中低层偏东水汽输送对此次暴雨的贡献更大。两次强降水出现在对流云团发展最强盛、范围最大时或TBB梯度最大处。雷达回波特征存在明显不同，“过程1”影响系统为线性多单体强风暴，最大反射率因子达65 dBZ，具有中小尺度辐合、辐散和旋转特性，强降水期间VIL维持40 kg/m2以上并有跃增现象，更有利于强对流出现。“过程2”影响系统为分散性普通单体风暴，径向速度高层辐散不明显，VIL值明显小于“过程2”。 |
| 英文摘要: |
| Based on the conventional observation data,hourly surface observation data, NCEP reanalysis data,FY-2G satellite cloud picture and CR/CC radar data from Kashi ,environmental conditions and mesoscale characteristics of two extreme rainfall in west of southern xinjiang are analyzed. The results indicate that, both events happened under 500 hPa favorable synoptic situation.,100 hPa South Asia high presented eastern type and double body type,low-level jet stream,shear line and mesoscale convergence lines at surface were important influencing systems to the two extreme rainfall.Water vapor from 500 hPa vortex(trough) and low-level jet stream of 700~850 hPa provided favorable water vapor conditions for the occuring of the extreme rainfall. Heavy rainfall both occured at the maximum gradient of TBB and maximum range .The two events has significant differences in radar echo characteristics.The influencing systems of event1 was multiple-cell Linear storm, maximum reflectivity factor was 65 dBZ and had an obvious characteristic of meso and small scale convergence.VIL stay above 40 kg/m2 during the heavy rainfall.Event2 was caused by isolated cell,.VIL was significantly less than Event1. |
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