Semibalance Model in Terrain-Following Coordinates

摘要

By partitioning the hydrostatically-balanced flow into a nonlinearly-balanced primary-flow part and a remaining secondary-flow part and then truncating the secondary-flow vorticity advection and stretching-tilting terms in the vector vorticity equation,the semibalance model (SBM) of Xu (1994) in pseudoheight-coordinates is re-derived in terrain-following pressure coordinates,i.e,WRF's -coordinates (Skamarock et al.,2008).