| 刘国强,佟欣怡,杨莲梅,周雪英,杨柳.新疆巴州一次短时强降水过程的中尺度特征分析[J].沙漠与绿洲气象,2018,12(1):61~70 |
| 新疆巴州一次短时强降水过程的中尺度特征分析 |
| Mesoscale Characteristic Analysis of a Short-term Heavy Rainfall in Bayangol Mongol Autonomous Prefecture of Xinjiang |
| 投稿时间：2017-08-11 修订日期：2017-12-27 |
| DOI：10.12057/j.issn.1002-0799.2018.01.009 |
| 中文关键词: 短时强降水 低通滤波 中尺度天气系统 干空气侵入 |
| 英文关键词:Short-term heavy rainfall Low-pass filtering Mesoscale weather system Dry air trusion |
| 基金项目:中央级公益性科研院所基本科研业务专项基金资助项目, |
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| 中文摘要: |
| 利用常规地面、高空观测资料、FY-2G云图TBB资料、NCEP/NCAR（1°×1°）再分析资料以及库尔勒探空和多普勒雷达资料，采用25点平滑算子的滤波方法，对2016年8月23-24日新疆巴音郭楞蒙古自治州（下称巴州）一次短时强降水过程的中尺度特征及其发生、发展机理进行分析。结果表明：“三支急流”的有利配置以及700 hPa中尺度气旋性辐合的形成对强降水区内垂直运动的发展和水汽的辐合上升具有明显促进作用，配合低层高温高湿、中层干冷空气侵入、地面中尺度辐合线的形成等条件直接诱导了此次短时强降水的发生；强对流发生前，低层水汽饱和、对流不稳定层结、中等强度的垂直风切变和强的温度垂直递减率为强对流的发生发展提了良好的潜势条件；此次强降水的雷达回波具有较明显的强回波低质心结构特征，降水效率较高，持续时间较长，导致过程累积降水较大。另外，库尔勒及周边地区的短时强降水主要由弓型回波在缓慢东移过程中断裂分散成的多个γ尺度的对流单体造成。 |
| 英文摘要: |
| Based on the conventional observation data, TBB from FY-2G satellite, NCEP/NCAR reanalysis data with 1°×1° spatial resolution, sounding and Doppler radar reflectivity factor and radial velocity data in Korla of Xinjiang, the meso-scale characteristic and the mechanism of a short-term heavy rain event which occurred in Bayangol Mongol Autonomous Prefecture of Xinjiang from 23 to 24 on August 2016 are analyzed by the 25-point smooth filter methods. The results show that the coupling of “three-branch airflow”and the formation of meso-scale cyclonic convergence on 700 hPa was played an important role to ascending motion development and vapor convergence uplift in precipitation area, with high temperature and humidity on lower levels, the inrush of arid cold air on middle levels and the formation of surface meso-scale convergence line conditions directly induces the occurrence of the short-time strong precipitation weather; Before the process, low-level Water vapor saturation, instable convection stratification, medium-intensity vertical wind shear and strong temperature gradient lapse rate provide good potential conditions for the occurrence and development of the severe convective storm; The radar echo of the heavy rainfall presented a low-quality heart, the precipitation efficiency is higher and the duration is longer, which leads to the cumulative precipitation in the whole process. The bow echo broken up a number of meso-γ scale storm in the course of slow moving eastward, which caused the short-term heavy rainfall in Korla and its surrounding areas; |
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