不同中心位置的山东半岛冷流暴雪天气分析  

Analyses of Ocean-Effect Snowstorms with Different Center over Shandong Peninsula

作　　者：李建华 崔宜少 杨成芳[2] 

机构地区：[1]威海市气象局,山东威海264200 [2]山东省气象台,山东济南250031

出　　处：《中国海洋大学学报（自然科学版）》2015年第8期10-18,共9页Periodical of Ocean University of China

基　　金：国家自然科学基金项目(41175044);山东省2012年专项(sdyby2012-10)资助

摘　　要：利用天气图和环渤海地面自动站风场资料,统计分析了2005—2014年山东半岛的14个冷流暴雪过程,总结出暴雪落区的特征:当500hPa影响系统为冷涡时,可以预测烟台、威海可能出现强降雪,冷涡中心偏南时,威海更有可能出现暴雪。当500hPa影响系统为低槽,烟台发生暴雪时,北部有小槽摆下,槽位置偏西;威海发生暴雪时,东部有宽广的东北-西南向横槽南摆,槽位置偏东。低空700hPa荣成站风速小于青岛时,暴雪中心在威海;反之,暴雪中心在烟台。当暴雪中心位于烟台时,地面图上辽东半岛西海岸有一片较规则的东北风区域;当暴雪中心位于威海时,辽东半岛西海岸无东北风或东北风较为凌乱,不连续出现。To sum up the spatial distribution character of snowstorms,fourteen ocean-effect snowstorm examples were analyzed based on synoptic chart and the data of automatic weather stations around Bohai Sea.The results show that.Cold vortex at 500 hPa isohypsic chart implies that strong snowfall will occur in Yantai and Weihai area,and if its core is south,snowstorm will occur in Weihai more easily.The trough of low pressure in the west at 500 hPa can lead to snowstorm in Yantai.In contrast,the wider zonal trough in the east leads to snowstorm in Weihai.Snowstorm center lies in Weihai when wind speed of Rongcheng in 700 hPa chart is less than Qingdao,or in Yantai.Obvious persistent north-east wind in west seashore of Liaoning peninsula is observed when snowstorm occurs in Yantai,and no or mussy north-east wind means that snowstorm occurs in Weihai.

关 键 词：冷流暴雪 中心位置 山东半岛 天气形势 

分 类 号：P426.634[天文地球—大气科学及气象学]