A Mass-conservative semi-implicit semi-Lagrangian limited-area shallow-water model on the sphere
Lauritzen, P. H., Kaas, E., & Machenhauer, B. (2006). A Mass-conservative semi-implicit semi-Lagrangian limited-area shallow-water model on the sphere. Monthly Weather Review, 134, 1205-1221. doi:10.1175/MWR3115.1
A locally mass conservative shallow-water model using a two-time-level, semi-implicit, semi-Lagrangian integration scheme is presented. The momentum equations are solved with the traditional semi-Lagrangian gridpoint form. The explicit continuity equation is solved using a cell-integrated semi-La... Show moreA locally mass conservative shallow-water model using a two-time-level, semi-implicit, semi-Lagrangian integration scheme is presented. The momentum equations are solved with the traditional semi-Lagrangian gridpoint form. The explicit continuity equation is solved using a cell-integrated semi-Lagrangian scheme, and the semi-implicit part is designed such that the resulting elliptic equation is on the same form as for the traditional semi-Lagrangian gridpoint system. The accuracy of the model is assessed by running standard test cases adapted to a limited-area domain. The accuracy and efficiency of the new model is comparable to traditional semi-Lagrangian methods. Show less
