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                      A Simulation Study on Radiation Budget and Water-Heat Exchange

                                      over Alpine Grassland Based on CLM4.5



                           WU Di 1,2,3 ,HU Zeyong ,FU Chunwei 1,2,3 ,WANG Shujing ,FAN Weiwei  1,2,3
                                                                                 1,2
                                                1,2
                         (1. Key laboratory of Land Surface Process and Climate Change in Cold and Arid Regions,Northwest Institute of
                              Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,Gansu,China;
                           2. Nagqu Station of Plateau Climate and Environment,Northwest Institute of Eco-Environment and Resources,
                                          Chinese Academy of Sciences,Nagqu 852000,Xizang,China;
                                        3. University of Chinese Academy of Sciences,Beijing 100049,China)


               Abstract:Forced by observations from 1 June to 31 August 2014,which are provided by Naqu station of Pla‐
               teau Climate and Environment in northern Qinghai-Xizang Plateau,CLM4. 5 is used to evaluate the influence on
               simulated results of both radiation balance and exchange of water-heat after some surface parameters and parame‐
               terization schemes including LAI、vegetation coverage and roughness length have changed. The reason for these
               changes are also discussed in this article. The results suggested that(1)Compared with the results produced by
               default scheme Z98,those of schemes named Z12 and B82 perform better in decreasing the positive bias of la‐
               tent heat fluxes and negative bias of sensible heat fluxes.(2)aerodynamic roughness length calculated by revised
               Massman model and a method named“Chen”are respectively used to replace the default value,the outcomes
               produced by CLM approach the observations further.(3)With leaf area index increasing,sensible heat fluxes
               and reflected radiation and surface long-wave radiation decrease a lot,while latent heat fluxes are on the in‐
               crease.(4)As the vegetation cover increases,latent fluxes decreases,while sensible heat fluxes and reflected ra‐
               diation and surface long-wave radiation rise,meanwhile soil temperature and moisture also rise. The aim of this
               study is to provide a basis for future ambition to simulate the balance of ground surface water and heat over the
               whole Plateau.
               Key words:land surface model;radiation budget;water and heat exchange;roughness length;plant parameters
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