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气象:2007,33(10):28-36
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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
(1.南京信息工程大学气象灾害重点实验室,大气科学学院, 210044;2. 河南省平顶山市气象局;3.河南省平顶山市气象局)
Numerical Simulation and Diagnos is of Dry Intrusion in a Dust Storm Process of Henan Province During April 2006
(1.Jiangsu Meteorological Disasters Key Lab and Institute of Atmospheric Scienc es, Nanjing University of Information Science & Technology, 210044;2.Pingdi ngshan Weather Office,Henan Province;3.Pingdingshan Weather Office,Henan Province)
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投稿时间:2007-01-15    修订日期:2007-08-07
中文摘要: 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—1 3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。
Abstract:A dust weather process occurred in Henan Province during 11-13 April, 2006. By u sing NCEP re analysis data (horizontal resolution 1°×1°) and the simultaneou s sounding, surface air observational records, a meso scale numerical simulati on and diagnostic analysis applying dry intrusion theory was made for this proce ss. The results showed that the dry air intrusions obviously play a significant role in this process.The air of high potential vorticity and low humid slip peddown southward along with dense strips of equivalent potential temperatu re, 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 affecte d together and triggered instable weather. Meanwhile with low level convergence and high level divergence, they caused this dust weather.
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基金项目: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)
引用文本:
李戈,寿绍文,张广周,白家惠,朱丽娜,2007.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[J].气象,33(10):28-36.
Li Ge,Shou Shaowen,Zhang Guangzhou,Bai jiahui,Zhu lina,2007.Numerical Simulation and Diagnos is of Dry Intrusion in a Dust Storm Process of Henan Province During April 2006[J].Meteor Mon,33(10):28-36.