首页 | 本学科首页   官方微博 | 高级检索  
     检索      


Numerical simulation of Cb cloud vorticity
Authors:Mladjen &#x;uri&#x;  Dejan Janc  Vladan Vu kovi&#x;
Institution:aInstitute of Meteorology, University of Belgrade, Serbia and Montenegro
Abstract:Vertical vorticity characteristics within individual cumulonimbus (Cb) cloud moving over complex terrain are investigated by cloud-resolving mesoscale model. Orography impact on vorticity is recognized by comparison of its characteristics within the storm moving over flat terrain under the same other conditions. In present study, two cases are considered: complex terrain case (referred to as CT case) and flat terrain case (referred to as FT case). A sensitivity study shows that orographical effects on vorticity are important. Main findings are:
– For CT case vortices produced by convective tilting of horizontal vortices are closer to each other and more stretched in form owing to valley configuration. The vortex with positive vorticity is mainly stronger in magnitude compared to its negative counterpart.
– Magnitudes of vorticities for CT case are greater at lowest levels and initial time intervals compared to those for FT case.
– For CT case the vortices with opposite signs of vorticity produced by precipitation appear later than in FT case. Their duration is shorter and they are weaker in intensity compared to those formed within a cloud over flat terrain.
– Complex terrain intensifies the splitting of simulated cloud.
Keywords: Mesoscale model; Vertical vorticity; Orography effects; Vortices
Keywords:Mesoscale model  Vertical vorticity  Orography effects  Vortices
本文献已被 ScienceDirect 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号