第 3 3 卷第3 期
2010年6 月
大气科学学报
Transactions of Atmospheric Sciences
Vol. 33 No. 3
Jun.2010
苗春生,谢洁,王坚红,等.一次山东半岛强冷流暴雪过程的数值模拟和诊断分析[J].大气科学学报,2010,33(3) ：257-265.
Miao Chun-sheng ,Xie Jie，Wang Jian-hong, et al. Numerical simulation and diagnostic analysis of a cold airflow snowstorm process in Shandong Penin-
sula[J], Trans Atmos Sci,2010,33(3) ：257-265.
一次山东半岛强冷流暴雪过程的数值模拟和诊断分析
苗春生w ，谢洁w ，王坚红\ 张楠u
(南京信息工程大学1.大气科学学院；.气象台,江 苏 南 京 210044)
摘要：利用N C E P / N C A R 再分析资料，应用W R F 中尺度数值模式对山东半岛2008年 1 2 月4一6
日的冷流暴雪天气过程进行了数值模拟，利用模式输出的时空分辨率较高的资料，对此次冷流暴雪
的特征及其产生的物理机制进行了分析。结果表明，这次暴雪产生在西北气流、较大海气温差的背
景条件下，一定的海气温差是冷流暴雪的重要指标；冷流暴雪产生在较强垂直上升运动区的相当位
温高值区附近；水汽输送方向为西北一东南向，水汽辐合层比较浅薄且范围狭窄；降雪分布具有明
显的南少北多的特征;850 hP a 湿 Q 矢量散度场辐合区的存在、位置及强度与暴雪的产生、落区及
强度具有较好的对应关系；湿Q 矢量分量的垂直分布揭示了次级环流的方向和强弱，暴雪位于次
级环流的上升支附近。
关键词：暴雪;数值模拟;诊断分析
中图分类号：P458.2 文献标识码:A 文章编号：1674-7097(2010)03-0257-09
Numerical Simulation and Diagnostic Analysis of a Cold
Airflow Snowstorm Process in Shandong Peninsula
M I A O Chun-sheng1，,XIE Jie12 , W A N G Jian-hong1, Z H A N G N a n 1’2
(1. School of Atmospheric Sciences ；2. Meteorological Observatory,N U I S T ,Nanjing 210044 ,China)
Abstract：Based on the N C E P / N C A R reanalysis data’ the mesoscale model-WRF(Weather Research
Forecast) is used to simulate the process of a cold-air snowstorm which occurred in Shandong Peninsula
from December 4th to December 6th 2008. High spatio-temporal resolution data from model output are
used to analyze the cold-air snowstorm process. Main conclusions are as follows ： this snowstorm oc
curred under the background of the northwest airflow and significant sea-air temperature differences ’
which were an important symbol of cold airflow snowstorm. Snowstorm occurs in the high energy belt
with strong ascending motion. The direction of vapor is N W - S E oriented and the convergence of vapor
only occurs in middle-low layer and in a narrow region. Snowstorm is mainly distributed in the northern
area of Shandong Peninsula. The existence, location and intensity of the convergence of wet-Q>-vector at
850 hPa have a significant relationship with the emergence，distribution and strength of the snowstorm.
Results also show that snowstorm occurs near the ascending branch of a secondary circulation ’ whose
intensity and direction can be indicated by vertical distribution of wet-Q>-vector. The above conclusions
are beneficial for the snowstorm forecast in Shandong Peninsula.
Key words：snowstorm；numerical simulation;diagnosis analysis
收稿日期:2009-12-09;改回日期:2010犯 -16
基金项目：国家自然科学基金资助项目（40776017)；国家科技支撑计划课题(2007BAC29B0604)
作者简介:苗春生（1954— ），男 ，内蒙古呼和浩特人，教授，研究方向为天气气候预测方法和现代教育技术等，CSmiao@niiiSt. edu. cn.
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