CAJ | 학술논문

利用常规观测资料和NCEP 1°×1°再分析资料,对2010年8月18日发生在河北的暴雨过程进行诊断分析,结果表明：暴雨区处于西南风高空急流中心右后侧,高低空急流的耦合是强降雨出现并维持的重要原因。地面湿静力能量锋区的形成和维持,为暴雨的产生提供了很好的中尺度触发条件。500 hPa干位涡能较好地表征冷空气的活动,且对降雨落区有很好的指示意义。暴雨前期850hPa为负位涡异常,大气对流不稳定,随正位涡异常区冷空气的侵入强对流暴雨爆发。
이용상규관측자료화NCEP 1°×1°재분석자료,대2010년8월18일발생재하북적폭우과정진행진단분석,결과표명：폭우구처우서남풍고공급류중심우후측,고저공급류적우합시강강우출현병유지적중요원인。지면습정력능량봉구적형성화유지,위폭우적산생제공료흔호적중척도촉발조건。500 hPa간위와능교호지표정랭공기적활동,차대강우락구유흔호적지시의의。폭우전기850hPa위부위와이상,대기대류불은정,수정위와이상구랭공기적침입강대류폭우폭발。
By using conventional observation data and NCEP 1°× 1°reanalysis data,the rainstorm process occurred on August 18,2010 in Hebei Province was diagnosed.The results show that the heavy rain appeared in the right and back side of southwest jet center,and the coupling of the high and low level jets was the important reason for occurrence and standing of the heavy rain.The formation and persistence of the ground wet static energy frontal zone provided a good mesoscale triggering condition for the rainstorm.The 500 hPa dry potential vorticity can obviously characterize cold air activities and it was a good instruction of rainfall dropping zone.In the early stage of the rainstorm,there was negative potential vorticity abnormalities at the level of 850 hPa and convection instability,with cold air invading from abnormal potential vorticity the strong convective storm broke out.