Full-Text Search:
Home|Journal Papers|About CNKI|User Service|FAQ|Contact Us|中文
《Chinese Journal of Atmospheric Sciences》 2005-03
Add to Favorite Get Latest Update

Analysis of the Mesoscale Characteristics About a Severe Thunderstorm in North China

GONG Dian\|Li 1, 2 , WU Zeng\|Mao 2 , and FU Gang 2 1 Shandong Meteorological Institute, Jinan 250031 2 College of Physical and Environmental Oceanography, Ocean University of China, Qingdao 266003  
A severe thunderstorm that occurred on 23 August 2001 in North China is simulated with a mesoscale model. The downslope wind from the Taihang Mountains is the key mechanism to initiate the convection, on the other hand, the terrain can induce unbalanced low\|level flow, which plays an importance role in generating the mesoscale gravity waves (MGWs) by convergence and divergence in the lower troposphere. The MGWs wavelength is 100120 km, and the propagation speed is 2128 m·s -1 . The explosive convection can initiate MGWs in the higher troposphere and enhance the low\|level MGWs. Convective and shear instability can provide the wave energy. During the initial and merger stages, the convection and MGWs probably interact with each other constructively. Particularly, the line of deep convection seems to provide the waves energy through enhancing mass convergence/divergence, the waves tend to organize convective elements into a line structure, the wave\|CISK is a noticeable mechanism, and the wave/convection interaction verifies certain theories of gravity wave propagation and the vertical structure conceptual model. After the storm moves into the Shandong area and reaches a maturation period, the moist downdraft appears, the MGWs disunite from the thunderstorm and move faster, and the MGWs weaken gradually because of absence of wave duct and energy supply.
【Fund】: 山东省气象局重点课题“山东省中尺度数值预报系统的建立及应用”、“中尺度模式业务系统及高性能计算环境应用”;; 山东省自然科学基金课题Y2003E01
【CateGory Index】: P445
Download(CAJ format) Download(PDF format)
CAJViewer7.0 supports all the CNKI file formats; AdobeReader only supports the PDF format.
©2006 Tsinghua Tongfang Knowledge Network Technology Co., Ltd.(Beijing)(TTKN) All rights reserved