山东半岛致灾大暴雨成因个例分析  

Causal Analysis of a Disaster-Inducing Rainstorm in Shandong Peninsula

作　　者：杨晓霞[1] 李春虎[2] 李锋[2] 石磊 肖明静[4] 

机构地区：[1]山东省气象台 [2]山东省气象局,济南250031 [3]山东省烟台市气象局,烟台264003 [4]山东省气象科学研究所

出　　处：《气象科技》2008年第2期190-196,258,共8页Meteorological Science and Technology

基　　金：山东省气象局科研课题"引发山洪和地质灾害的气象预报预警方法研究";"山东省中尺度对流系统的时空分布特征"共同资助

摘　　要：对2006年7月27日山东半岛东部致灾暴雨的成因进行了分析,暴雨是由4个中β尺度的对流云团影响产生的。在华南沿海登陆的0605号热带低压"格美"的倒槽、高空西风槽和副热带高压相互作用,在热带低压的东部和副热带高压的西侧形成偏南风低空急流,建立起通向暴雨区的水汽通道。低层暖湿气流的输送,使得中低层大气高温高湿和对流性不稳定。在低空南风急流的左前方,辐合、正涡度和上升运动发展,正k螺旋度增强;高空槽前西南风急流的右后侧,辐散和负涡度发展,负k螺旋度猛烈发展,对低层产生抽吸作用,加强了低层的辐合上升运动,触发对流不稳定能量释放,中尺度对流云团发展,造成强降水。The causes of a disastrous rainstorm in Shandong Peninsula on 27 July 2006 are analyzed. It is shown that the rainstorm was resulted from four meso-β convective cloud clusters. The inverse trough of the tropical cyclone ＂Kaemi,＂ the westerly trough at high level and the subtropical high interacted mutually. The southerly jet formed between tropical low and subtropical high, and the water vapor channel into the rainstorm area was set up. The warm and wet air transportation increased the temperature and humidity in the low-level atmosphere over the heavy rain area, so the atmosphere became convectively instable. On the left front of the low-level southerly jet, the convergence, positive vorticity, and upward movement developed so that positive k-helicity increased. On the right backside of the southwesterly jet in the front of the high level trough, the divergence and negative vorticity developed so that the negative khelicity increased tempestuously, which produced pumping effect to the low-level atmosphere, resulting in the convergence and increased upward movement at low levels. The convective instability energy was triggered and released, so that the mesoscale convective cloud clusters were produced and rainstorms occurred.

关 键 词：低空急流 水汽通道 k螺旋度 抽吸作用 中尺度云团 暴雨 

分 类 号：P426.62[天文地球—大气科学及气象学] P731.23