Effects of Large-Scale Condensation Heating and Mesoscale Potential Temperature Disturbances on Cold Frontogenesis
大尺度凝结加热与中尺度位温扰动对冷锋锋生的作用

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.