摘要
利用NCEP再分析资料、L-波段雷达探空资料,分析了2010年6月15日发生在大连地区的强雹暴过程的环流形势和垂直气流结构;并利用中国科学院大气物理研究所的完全弹性三维雹云数值模式,模拟了该过程的雷达回波结构特征、含水量场等宏微观物理量的分布及其演变,着重分析了冰雹云的成雹机制。结果表明,模式较成功地模拟出了雹云回波的强度和发展高度,并模拟出了回波墙、弱回波区及悬垂回波等一系列强冰雹云的回波结构特征。该雹云的冰雹主要由冻滴转化形成,冰雹的增大主要依赖于与云滴、雨滴的撞冻过程,即冰雹主要是通过撞冻过冷水长大;冰雹与霰粒和雪花的碰并过程比较强,而与冰晶的碰并增长量很小。
The circulation situation and vertical air flow structure of a strong convective storm in Dalian on 15 June, 2010 was analyzed using the sounding data from GTS1 digital radiosonde, conventional observation data, and NCEP/NCAR 1°×1° reanalysis data. And the strong convective storm is simulated by the fully elastic three-dimensional convective storm model （IAP-CSM3D） that developed by the Institu- te of Atmospheric Physics （IAP）, the Chinese Academy of Sciences. The initial field of the model is the observational data, combining the observational data by the Doppler weather radar, the distribution and evolution of macro-physical as well as micro-physical variations such as wind field structure, radar echo structure, overhang echo, bound weak echo region, strong echo wall and water content, et al. in the hail stone are analyzed. Some typical features of supercell structure are revealed on the basis of the analysis. The formation mechanism of hailstone in the storm was analyzed too. The results show that the auto con- version of frozen drops is the main source of the hailstone in the strong convective storm process. Hail- stones mainly depend on the processes of collecting supercooled water （CLch, CLrh） to grow. The process of hail particles collecting with graupel and snowflake is relatively stronger, while the growth process of hail particles collected with ice crystal is very small.
出处
《高原气象》
CSCD
北大核心
2012年第3期836-846,共11页
Plateau Meteorology
基金
国家自然科学基金项目(40975003
40875080)
大连市科技局科技计划项目(2008E13SF188
2009E11SF230)共同资助
关键词
强单体雹暴
数值模拟
悬挂回波
成雹机制
Strong supercell storm Numerical simulation Overhang echo Mechanism of hailstoneformation
