Full-Text Search:
Home|About CNKI|User Service|中文
Add to Favorite Get Latest Update

Characteristics of Convective and Stratiform Echoes in Beijing-Tianjin Region

LIN Yinjing1,WANG Hongqing1,,HAN Lei2,WANG Yu1,ZHENG Yongguang3 1.Department of Atmospheric and Oceanic Sciences,School of Physics,Peking University,Beijing 100871;2.College of Information Science and Engineering,Ocean University of China,Qingdao 266100;3.National Meteorological Center of CMA,Beijing 100081;  
The reflectivity fields of Beijing-Tianjin region during 2005-2007 were classified into convective and stratiform components using an automatic algorithm,and then the vertical profiles and diurnal variation of convective and stratiform echoes in this region were analyzed.The results are as follows.1) An obvious bright band was in the stratiform profile of Beijing-Tianjin region at about the 4 km altitude.The bright band was strongest in the night local time,while weakest in the morning.2) In this region,the diurnal variations of both convective area and stratiform area were unimodal.The maximum areas occurred in the local evening,while the minimum occurred near local noon.The variation of stratiform area was about 1-2 hours later than convective area.3) There were two peaks in the diurnal variation of the ratio between convective and stratiform area.One was associated with the thermal convection in the local afternoon,and the other was connected with the moist mass convection happens in the local evening.Both these two types of convection are typical convective systems in Beijing-Tianjin region.
Download(CAJ format) Download(PDF format)
CAJViewer7.0 supports all the CNKI file formats; AdobeReader only supports the PDF format.
©CNKI All Rights Reserved