西藏地区强降雪过程的波包分布及传播特征  

Characteristics of Wave Packet Propagation of Heavy Snowstorm Process in Tibet

作　　者：李晓婧[1] 林莉 肖天贵[3] 唐毅[4] 何建军[4] 

机构地区：[1]中国民航飞行学院,广汉618307 [2]民航西南空管局气象中心,成都610202 [3]成都信息工程学院大气科学学院,成都610225 [4]四川省德阳市气象局,德阳618000

出　　处：《高原山地气象研究》2012年第1期29-34,共6页Plateau and Mountain Meteorology Research

基　　金：中国民航飞行学院科研基金青年基金项目(Q2010-52)

摘　　要：利用NCEP/NCAR高度场的再分析资料,通过波包传播诊断方法(WPD),对2005年10月19～23日西藏地区中东部及南部边缘地区一次大范围强降雪天气过程进行波包分布与波能传播特征分析。结果表明:500hPa高度场的波包分布和传播特征很好地反映此次过程;强降雪天气发生在波包大值区域内而且反映了过程的爆发和消亡;波包的分布特征与强对流天气的发生状况是一致的;波包的移动路径很好地反映了扰动能量的传播。此次过程是"积累-释放"的三次循环。With the diagnosis analysis method of wave packet propagation（WPD）,by using the NCEP/NCAR reanalysis data of height field,we study the distribution characteristic of wave packet and propagation characteristic of wave energy based on a widespread snow storm event in southern marginal and east-central areas of Tibet on 19-23 October,2005.The results show the distribution characteristic of wave packet and the propagation characteristic of wave energy in middle level 500hPa can show the snowstorm process better which occurred during that period.We can see the snowstorm process appear in the high value region of wave packet and the outbreak extinction of the process.The distribution characteristic of wave packet is in accordance with the process of severe convection weather.The movement path of wave packet can perfectly display the propagation of accumulated perturbation energy.Accordingly,the process can be recognized as three cycle of ＂accumulation-release＂ which happened in Oct.21st^23rd.

关 键 词：波包传播诊断 强降雪天气过程 扰动能量 西藏地区 

分 类 号：P458[天文地球—大气科学及气象学]