Effects of Topographic Slopes on Hydrological Processes in the Penn State-NCAR MM5-LSM modeling system

• Main Authors: Yi-Nan Ku, 古一男
• Other Authors: Han-Ru Cho
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/20221236698088011332

碩士 === 國立中央大學 === 大氣物理研究所 === 91 === ABSTRACT It has been widely accepted that land surface processes and their modeling play an important role, not only in large-scale atmospheric models, but also in regional and mesoscale atmospheric models. In the Penn State-NCAR fifth-generation Mesoscale Model (MM5) used has its origin at the Oregon State University land surface model (LSM). But in the MM5-LSM, hydrological processes that the horizontal distribution of surface water should be depended on the topographic slopes were not included. Topographic slopes will cases outflows from higher topography to lower. Then the horizontal distribution of surface water and the soil moisture should be changed. So, we wish to address this aspect of the problems. We will compare with between the third kinds of different physical state’s simulation (the MM5’s simulations, the MM5-LSM’s simulations and the MM5 - LSM’s simulations with topographic effect), we find that the LSM can improve the simulation of the surface energy balance with add soil moisture to the MM5.Then the horizontal distribution of surface water and the soil moisture will be more real in the MM5-LSM’s simulations with topographic effects. Therefore the surface energy fluxes will be different, including both the sensible and latent heat fluxes. Thus it is expected the modifications will not only affected the weather simulations but also the climate simulations.