大尺度凝结加热与中尺度位温扰动对冷锋锋生的作用  

Effects of Large-Scale Condensation Heating and Mesoscale Potential Temperature Disturbances on Cold Frontogenesis

作　　者：吕克利[1] 布和朝鲁[1] 

机构地区：[1]南京大学大气科学

出　　处：《大气科学》1995年第3期321-328,共8页Chinese Journal of Atmospheric Sciences

基　　金：国家自然科学基金

摘　　要：文中导得简化的包括大尺度凝结潜热的半地转锋生模式，利用该模式讨论了大尺度凝结加热和中尺度位温扰动对冷锋锋生的影响，给出了锋生过程中各物理量的演变图。计算结果表明，大尺度凝结加热对冷锋锋生具有加强作用，增大锋生率，增大上升运动速度，缩小上升运动区的范围，使之更具有中尺度系统特征，使非地转越锋环流增强并发生倾斜，凝结加热和中尺度位温扰动的结合是锋前暖区多重雨带形成的可能机制之一。A simplified semigenstrophic frontogenesis model including large-scale latent heating is derived in this paper. Using such model, the influences of latent heat release and mesoscale potential temperature disturbances on cold frontogenesis are discussed. The results show that large- latent heating leads to a significant increase of frontogenesis rate and updraft and also reduces the scope ofascent motion mostly.The frontal circulation, therefore, has even more obvious mesoscale features .Because of the condensation heat release, the structure of ageostrophic circulation in the frontal area is even more similar to the slantwise convection pattern. The combination of mesoscale potenhal temperature disturbance and the condensation heating is one of the possible mechanisms causing multiple rainbands in the warm sector ahead of the front.

关 键 词：中尺度扰动 锋生 冷锋 大尺度 凝结加热 

分 类 号：P441[天文地球—大气科学及气象学]