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Thanks Ming for your suggestion. I will be able to chenge this using NCL. Just wondering whether I need to change in both wrfinput and wrfbdy files. In wrfinput, I can see the variable T and in wrfbdy, I can see some of the T related variables T_BXS, T_BXE, T_BYS, T_BYE, T_BTXS, T_BTXE, T_BTYS, T_BTYE. Do I need to change all of the parameters to change the temperature?
Whether you need to change temperature in the wrfbdy file depends on the sensitivity experiment you will do. In most cases, I believe that both wrfinput and wrfbdy should be changed. Otherwise there will exist inconsistency between the initial data and the boundary forcing.