摘要
利用NCEP fnl 1°×1°全球资料、常规气象观测资料和风廓线雷达资料,从急流角度入手对2014年5月16-18日江西中北部地区的暴雨过程进行诊断分析。结果表明,超低空、低空急流的加强为暴雨区持续提供能量以及水汽,且急流前端辐合抬升加强了上升运动;高空200 h Pa我国东北地区低涡和南亚高压配合形成的分流区产生的辐散作用对降水存在促进作用;超低空急流脉动有利于强降水的产生;高、低空急流的适宜配置产生的动力场耦合作用,为大暴雨的发生、发展提供非常有利的动力条件。对模式风场预报检验发现,模式预报稳定性较好,但是模式预报在急流核强度上与实况存在一些差别。
Using FNL 1°×1° degrees Gribl global data and Micaps data, From the perspective of rapids,the diagnosis and analysis of the rainstorm in the mid-north of Jiangxi Province from May 16 to 18,2014. The results showed that,the strengthening of extra low-altitude jet and low-altitude jet provides energy and water vapor for the rainstorm area, and the convergence of the front of the jet strengthens the ascending motion;in high altitude 200 hPa, the divergence effect of the distributacy area formed by vortex in Northeast China and South Asian high pressure can promote precipitation;the fluctuation of extra low-altitude jet is favorable to the generation of rainstorm;appropriate allocation of high and low-altitude jet, can produce coupling dynamic field, provide very favorable conditions for the occmfence of the rainstorm. The model wind field prediction test shows that there are some differences between the model forecast and the actual situation in the nuclear strength of the rapids, and the stability is good.
作者
孙炜文
郭达烽
陈云辉
SUN Weiwen;GUO Dafeng;CHEN Yunhui(Jiangxi Meteorological Observatory,330046,Nanchang,PR)
出处
《江西科学》
2018年第5期814-820,共7页
Jiangxi Science
关键词
暴雨
急流
超低空急流脉动
模式预报检验
rainstorm
jet momentum transmission
fluctuation of extra low-altitude jet
the model prediction test
