CAJ | 학술논문

利用常规观测资料和NCEP逐6 h的1°×1°再分析资料，对2013年12月15—17日江西冬季最强连续暴雨天气过程进行诊断分析。结果表明：1）暴雨过程是由于南支槽位于大陆高压和副热带高压之间，西风气流强度弱和副热带高压的阻挡作用导致槽移动缓慢，长时间滞留导致槽前西南气流沿低层锋区爬坡而形成的。2）冬季暴雨的产生与充沛的水汽输送、较强的辐合上升运动、较长的持续时间密切相关，且与700 hPa高度层上的水汽、动力等条件联系更紧密。3）相比一般汛期暴雨过程，冬季暴雨过程中比湿、K指数等明显偏小，大气层结比汛期暴雨要稳定得多，但该次暴雨过程在垂直速度、散度、水汽输送条件非常接近汛期暴雨相关指标。
이용상규관측자료화NCEP축6 h적1°×1°재분석자료，대2013년12월15—17일강서동계최강련속폭우천기과정진행진단분석。결과표명：1）폭우과정시유우남지조위우대륙고압화부열대고압지간，서풍기류강도약화부열대고압적조당작용도치조이동완만，장시간체류도치조전서남기류연저층봉구파파이형성적。2）동계폭우적산생여충패적수기수송、교강적복합상승운동、교장적지속시간밀절상관，차여700 hPa고도층상적수기、동력등조건련계경긴밀。3）상비일반신기폭우과정，동계폭우과정중비습、K지수등명현편소，대기층결비신기폭우요은정득다，단해차폭우과정재수직속도、산도、수기수송조건비상접근신기폭우상관지표。
Based on the Automatic weather station data(AWS), convection observational data and the FNL(1°×1°) reanalysis data, the characteristics of a rainstorm process were analyzed in south-central Jiangxi from December 15 to 17, 2013. The results showed that the south branch trough was located between the continental high and the Pacific subtropical high. The south branch trough moved slowly because of the weak westerly flow and subtropical high blocking. The stable southwesterly flow of high-level trough climbed along the low-level frontal zone, which was an important reason for the persistence of precipitation. The rainstorm process was closely related to the abundant water vapor transportation, strong convergence ascending motion and long duration, and was more closely related to the water vapor condition and dynamic condition at 700 hPa. Compared with the rainstorm process in the flood season, the specific humidity, K index were apparently smaller in winter rainstorm process, also the atmosphere condition was much more stable. However, during this process, which was the strongest rainstorm process in winter over the past years, the vertical velocity, divergence and water vapor conditions in the heavy rain process were closely to the flood season rainstorm.