【作者】 孙兴池； 王文毅； 闫丽凤； 王业宏； 隋岩；

【Author】 Sun Xing-Chi1, Wang Wen-Yi1,Yan Li-Feng2,Wang Ye-Hong1, (1.Shandong Meteorological Observatory, Jinan, 250031, 2. Yantai Meteorological Observatory, YanTai,264001 )

【机构】 山东省气象台； 烟台市气象台；

【摘要】 利用常规资料及MM5模拟结果,对2005年12月3～22日山东半岛特大暴风雪过程进行了分析,结果表明:本次过程发生在前期异常偏暖,而强冷空气导致寒潮爆发的形势下,强海气温差、日本海后部横槽持续气旋性弯曲和强冷平流是大尺度环流背景,半岛北部一带850hPa气温下降到-12℃是出现大雪或暴雪的重要指标;中尺度分析的结果表明冷流降雪的散度、垂直速度、涡度垂直结构不同于一般暴雨过程,其上升运动、高空辐散等局限在500hPa以下的对流层中低层,使冷流降雪由低云引起,为更深入了解冷流降雪的机制提供参考。更多还原

【Abstract】 By using observational data and MM5 numerical simulation, a heavy snowstorm event occurred in the Shandong peninsula is analyzed on 3～22 December 2005 . Results show that the abnormal warm temperature before the event, the strong air-sea temperature difference, continuous cyclonic curvature and strong cold advection provide the large-scale circulation fields , the strong cold air cause the explosive cold surge,The temperature at 850hPa descending to -12℃ or lower is the important index of snowstorm over the north coastal area of Shandong peninsula。Otherwise, the mesoscale analysis indicates cold current snowfall is produced by low-level cloud with its updrafts and upper level divergence. its divergence, vertical velocity and vorticity is different from the normal rainfall event. It provides a important reference for us to study cold current snowfall mechanism.更多还原