| 低空急流演变对阜新地区短时暴雨影响研究 |
| |
| 引用本文： | 张丹梅,辛艳辉,杨晓彤.低空急流演变对阜新地区短时暴雨影响研究[J].安徽农学通报,2014(15):146-151. |
| |
| 作者姓名： | 张丹梅 辛艳辉 杨晓彤 |
| |
| 作者单位： | 阜新市气象局,辽宁阜新123000 |
| |
| 摘 要： | 利用阜新地区2004-2013年29次天气过程中36个时次短时暴雨相关数据，采用统计学、天气学和物理量计算等方法，从低空急流的角度对阜新地区短时暴雨的时间分布规律、天气形势、典型环境场特征和预报指标进行研究，并利用2013年8月12日午后发生的短时暴雨天气过程对低空急流的作用进行了探讨。结果表明：（1）阜新地区短时暴雨的月变化特征显著，主要发生在6～8月；日变化规律也非常明显，11：00～18：00时出现的几率最大。（2）阜新地区产生短时暴雨的天气系统按照低空急流和500hPa天气形势分为涡旋式急流型、高空槽前急流型、副高西北部急流型、横槽式无急流型等4种类型；（3）低空急流的气流多来自热带洋面上，因此它往往起着输送低空大量的热量、水汽和动量的作用，当它将暖湿空气输送到较干较冷空气的下方时，就形成了不稳定层结，在低空急流左侧上升运动的触发下，易产生对流性降水；（4）选取中低层比湿、露点、涡度、散度、垂直速度、K指数、θse（850-500）、T（850-500）、V（700-850）、V（850-925）等物理量作为预报因子，建立本地化短时暴雨预报指标。
|
| 关 键 词： | 低空急流 短时暴雨 影响研究 阜新地区 |
Effect of Evolution of the Low-level Jet on the Short-time Heavy Rain in Fuxin Area |
| |
| Institution: | Zhang Danmei et al. (Fuxin Meteorological Service,Fuxin 123000,China) |
| |
| Abstract: | Temporal distribution, physical quantity field and prediction index of 29 weather processes of short-time rainstorm in 36-times from 2004 to 2013 in Fuxin the use of the methods of statistics,synop-tic meteorology and physical quantity calculation. And the effecting of low-level jet was explored based on the short-time heavy rain at pm on August 12,2013. The results showed that,（1）The time-space distribu-tion of short-time rainstorms was not uniform. Its monthly variation was significant,focusing primarily on June to August,diurnal change was great,mostly appearing from 11：00 to 18：00.（2）According to low-lev-el jet and weather situation of 500hPa,rainstorm weather can be divided into four types：vortex-jet,front of upper groove-jet northwestern of the subtropical high-jet, sidelong groove-no jet.（3）When the warm-wet air brought under the drier and colder, instability stratification was formed. Convectional precipitation easily fell under the trigger action of upward movement on the left side of the low-level jet. （4）Selecting twenty-one forecast factors---specific humidity,vorticity,divergence,vertical velocity at 700hPa,850hPa and 925hPa,dew point at 850hPa,925hPa,1 000hPa and surface,θse（850-500）T（850-500）V（700-850）、V（850-925） and K index,which had apparent physical significance to short-time rainstorm weather,we could establish predic-tion index of Fuxin. |
| |
| Keywords: | Low-level jet Short-time rainstorm Impact study Fuxin area |
| 本文献已被 维普 等数据库收录！ |
|
