CAJ | 학술논문

利用常规探测资料,分析2008年1月27-28日淮河以南的区域性暴雪天气过程发现:暴雪发生在巴尔喀什湖阻塞高压东侧不断补充南下的冷空气与低空的西南急流输送的暖湿空气相结合的背景条件下,中低层的气旋式环流及其东侧的暖式切变线是暴雪天气的主要影响系统.PSU/NCAR非静力原始方程中尺度模式MM5V3 6较好地模拟了暴雪过程.高分辨率的数值模拟资料显示:水汽通量散度和垂直运动的特征揭示了700 hPa以上的中层的大气运动是暴雪发生的关键;整层的气温均在0 ℃以下,为降雪提供了充分的气温条件.通过对位涡、湿位涡的诊断发现,冷空气由中层自北向南向低层楔入,导致暖湿气流加强了的垂直运动沿冷空气垫倾斜上升产生对称不稳定,中尺度的对称不稳定是这次暴雪天气的物理机制.
이용상규탐측자료,분석2008년1월27-28일회하이남적구역성폭설천기과정발현:폭설발생재파이객십호조새고압동측불단보충남하적랭공기여저공적서남급류수송적난습공기상결합적배경조건하,중저층적기선식배류급기동측적난식절변선시폭설천기적주요영향계통.PSU/NCAR비정력원시방정중척도모식MM5V3 6교호지모의료폭설과정.고분변솔적수치모의자료현시:수기통량산도화수직운동적특정게시료700 hPa이상적중층적대기운동시폭설발생적관건;정층적기온균재0 ℃이하,위강설제공료충분적기온조건.통과대위와、습위와적진단발현,랭공기유중층자북향남향저층설입,도치난습기류가강료적수직운동연랭공기점경사상승산생대칭불은정,중척도적대칭불은정시저차폭설천기적물리궤제.
Based on the observation data ,the analysis of the regional snowstorm event occurred in south of Huaihe river during 27-28 January 2008 was made. The results showed that the background conditions of snowstorm is the combination of cold air supplemented continuously on the east side of blocking high located at Balchas Lake with low level southwest jet stream transportation of warm, moist air at the low level. The main influence systems are cyclonic circulation and shear line . Through analyzing numerical simulation data,the results showed: moisture flux divergence and vertical motion revealed that the middle atmosphere above 700 hPa is the key; atmospheric temperature of the whole atmosphere below 0 ℃ is the sufficient conditions.Through diagnostic analysis of ζ_p and ζ_m the results showed : cold air wedging from north to south in the lower layer caused that warm and wet flow inclined upward to this cold cushion. Slantwise updraft caused symmetric instability which developed vertical motion. Mesoscale symmetric instability is the physical mechanisms of heavy snow.