热带风暴海马变性前后的物理量诊断分析  

Diagnoses Analysis of Physical Characteristic Changes of Tropical Storm Haima Before and after Its Transformation

作　　者：张迎新 李根娥[2] 张守保 

机构地区：[1]河北省气象台,石家庄050021 [2]兰州大学大气科学学院

出　　处：《气象》2008年第3期49-55,共7页Meteorological Monthly

基　　金：国家科技部科研院所社会公益研究专项(2005DIB3J104)课题资助

摘　　要：利用NCEP再分析资料,针对热带风暴海马(0421)变性前后各物理量进行诊断分析,发现了一些有意义的结果。由变性前高低层的暖心对称结构到变性后非对称的锋面结构,其中冷空气是从低层、低压的西南象限开始入侵的。同时相对涡度场上,也由整层左右对称的正涡度演变成自低层到高层向西倾斜的垂直分布。另外,24小时平均相对涡度、平均散度呈现出中低层数值变大,且辐合上升层的厚度也加大的特点;最大上升速度中心的高度由变性前的600hPa上升到500hPa。由于西风带高空槽东移,变性后存在两条水汽通道,一条伴随槽前的西南气流,一条来自南海与强劲的偏南气流相伴。By using the data of NCEP, the physical characteristics of tropical storm ‘Haima＇ （0421） before and after its transformation are analyzed. The results show that before its transfor- mation, ‘Haima＇ had a warm core and a symmetric structure, and after transformation, the storm became more asymmetric and frontal. In this process, the cold air invaded into storm from the southwestern part at low-level layer. The relative vorticity changed from symmetric txasitive value at all levels beneath 200hPa to asymmetric structure. In the mean time, the mean relative vorticity and divergence in 24h in middle and low levels became bigger and layer became thicker. The height of vertical velocity center changed from 600hPa to 500hPa. There were two vapor channels because of the eastward trough, one came with southwestern flow, and the other came from the South China Sea with southern flow.

关 键 词：热带风暴 变性 物理量特征 诊断分析 

分 类 号：P444[天文地球—大气科学及气象学] V321.227[航空宇航科学与技术—人机与环境工程]