The Wet Potential Vorticity Equation and its Application
湿位涡方程及其应用

The wet potential vofticity equation and its approximate form are deduced on the conditions of wet adiabatic and frictionless. The characteristics of conservation of wet potential vorticity of large scale weather systems are obtained by means of the scale analysis. The conservation of wet potential vorticity is similar to that of dry potential vorticity. The wet potential vorticity includes the effects of water vapor. Therefore it is used more conveniently than the dry potential vorticity. Finally, the wet isentropic potential vorticity is applied in the analyses of the continuously rainy and fine weather in March in the area south to the Yangtze River and north to Naming Mountains. The results are consistent with the experience of forecasters.