重力波对一次雹暴天气过程演变的影响  

The Impact of Gravity Wave on a Hailstorm Weather Process Evolution

作　　者：孙继松[1,2] 王华 

机构地区：[1]北京区域中心气象台,北京100089 [2]中国气象局北京城市气象研究所,北京100089

出　　处：《高原气象》2009年第1期165-172,共8页Plateau Meteorology

基　　金：国家自然科学基金项目(40505002);北京市自然科学基金项目(8051002);科技部行业专项项目(GYHY200706004)共同资助

摘　　要：利用北京地区雷达、风廓线仪和稠密的自动站观测资料,对2005年5月31日午后多次出现雹暴现象的飑线天气过程进行了中小尺度诊断研究,揭示了雹暴系统的发生、发展和再生过程与地面气象要素分布之间的关系,重点分析了重力波对雹暴单体、雹暴群演变、移动的影响。结果表明:(1)在有利于强对流发生的大气环流背景下,由地形、强雹暴产生的重力波,不仅催生新的风暴单体,而且对风暴单体的移动、发展或减弱产生直接影响;(2)不同强迫源(地形、强雹暴)引发的、具有不同振幅、波长和波动周期的中尺度重力波之间通过复杂的相互作用过程对多个风暴单体的演变产生了重要影响,有利于雹暴群的形成。Using the auto-weather station network with high spatial-temporal resolution, radar and wind profiler datasets, some of micro-and meso-scale features of severe convective multi-hail storms that occurred in Beijing area on 31 May 2005 have been investigated, and the preliminary relationship among ambient meteorological elements and evolutions of hailstorm including their initiation, development and regeneration has been revealed, and emphatically, the effect of gravity wave on the interaction between hailstorm or hailstorm cluster has been analyzed. The results indicate. （1） when atmospheric circulation is propitious to severe convective activities, gravity wave forced by topography or severe hail storm not only activate new storm cell, but also produce direct effect on the motion, development, booming or fading of storm cell; （2） evolutions of multi-storm cells are significantly influenced by complicated interaction among the meso-scale gravity waves stirred by different forcing resources （such as topography, severe hailstorm）, different amplitudes, wavelengths and periodic variations, and it is beneficial to generation of hailstorm cluster.

关 键 词：雹暴单体 雹暴群 重力波 相互作用 

分 类 号：P458.121.2[天文地球—大气科学及气象学]