河南一次沙尘天气过程干空气侵入的数值模拟及诊断分析  

Numerical Simulation and Diagnos is of Dry Intrusion in a Dust Storm Process of Henan Province During April 2006

作　　者：李戈[1,2] 寿绍文[1] 张广周 白家惠 朱丽娜 

机构地区：[1]南京信息工程大学气象灾害重点实验室,大气科学学院,河南省平顶山市气象局210044 [2]河南省平顶山市气象局

出　　处：《气象》2007年第10期28-36,共9页Meteorological Monthly

基　　金：国家自然科学基金项目(40405009;40575022;40205008);江苏省气象局科技开发项目(200406);江苏省气象灾害重点实验室项目(KLME050201);国家重点基础研究发展规划项目(2004CB418301);江苏省自然科学基金项目(BK2005141)

摘　　要：利用NCEP再分析资料(水平分辨率1°×1°)和同时间的探空、地面资料对2006年4月11—13日发生在河南省的沙尘天气进行了中尺度数值模拟,并应用干空气侵入的理论对这次过程进行了诊断和分析。结果表明,此次沙尘天气过程中存在明显的干空气侵入,且干空气侵入对沙尘天气产生重要作用:高位涡、低湿空气沿等相当位温线密集带向南下滑,在对流层中低层引起位涡和温度扰动,造成强冷平流南下,使低槽东移加深、冷锋南压,触发不稳定大气,同时配合低层辐合、高层辐散叠置的流场,引发了河南省沙尘天气的发生、发展。A dust weather process occurred in Henan Province during 11 - 13 April, 2006. By using NCEP re-analysis data （horizontal resolution 1°×1°） and the simultaneous sounding, surface air observational records, a meso-scale numerical simulation and diagnostic analysis applying dry intrusion theory was made for this process. The results showed that the dry air intrusions obviously play a significant role in this process. The air of high potential vortidty and low humid slipped down southward along with dense strips of equivalent potential temperature, which caused disturbances of potential vorticity and temperature in mid-low level of troposphere. These disturbances led to strong cold advection southward and low pressure trough moving eastward and cold front southward, which affected together and triggered instable weather. Meanwhile with low level convergence and high level divergence, they caused this dust weather.

关 键 词：沙尘天气 干空气侵入 数值模拟 诊断分析 

分 类 号：P426.62[天文地球—大气科学及气象学]