A NUMERICAL INVESTIGATION OF THE IMPACT OF MOIST PROCESSES UPON THE STRUCTURE OF ACTIVE COLD FRONTS:APPLICATION OF A 3D MESOSCALE MODEL IN FRONTAL SITUATIONS

作     者：俞小鼎 EvelyneRichard RobertRosset 

作者机构：Department of Atmospheric SciencesBeijing Meteorological College.Beijing 100081 Laboratore 

出 版 物：《Acta meteorologica Sinica》 (气象学报(英文版))

年 卷 期：1996年第10卷第4期

页      面：463-472页

学科分类：07[理学] 070601[理学-气象学] 0706[理学-大气科学] 

主　　题：structure of cold front numerical simulation latent heating 3D mesoscale model 

摘      要：A 3D mesoscale model is applied in a marine cold front case in order to investigate the impact of latent heating on the structure of cold *** of the moist and dry simulations are compared to stress the effects of moist *** is found that both the temperature gradient and the cyclonic vorticity across the frontal zone considerably increase due to the latent heating,especially in the lower troposphere.A thermally direct cross-front ageostrophic *** by frontogenesis,is found better developed and organized in the moist case than in the dry *** cross-front direct ageostrophic circulation,particularly its ascending branch,is considerably enhanced by latent heating due to increased frontogenetical forcing and reduced effective static stability in the rising motion region where condensation *** important feature in most observed cold fronts is the presence of an intense rising cell just above their leading *** intense rising cell is well simulated in the moist case but is less clear and much weaker in the dry case,indicating the important contribution by the la- tent heat release to the formation of this intense updraft above the surface cold front.