modify namelist files for use_ktop_lw

Author: Dalei Hao

components/elm/bld/namelist_files/namelist_defaults.xml

@@ -626,6 +626,7 @@ this mask will have smb calculated over the entire global land surface
 
 <!-- namelist for ktop -->
 <use_ktop_rad>.false.</use_ktop_rad>
+<use_ktop_lw>.false.</use_ktop_lw>
 <use_ktop_surf>.false.</use_ktop_surf>
 
 <!-- SNICAR (SNow, ICe, and Aerosol Radiative model) datasets -->

components/elm/bld/namelist_files/namelist_definition.xml

@@ -641,6 +641,11 @@ If TRUE, TOP solar radiation parameterization will be activated, which considers
 If TRUE, kTOP radiation parameterization will be activated, which considers the effects of grid-scale topography.
 </entry>
 
+<entry id="use_ktop_lw" type="logical" category="elm_physics"
+       group="elm_inparm" valid_values="" value=".false.">
+If TRUE, kTOP radiation parameterization will be activated, which considers the effects of grid-scale topography.
+</entry>
+
 <entry id="use_ktop_surf" type="logical" category="elm_physics"
        group="elm_inparm" valid_values="" value=".false.">
 If TRUE, kTOP radiation parameterization will be activated, which considers the effects of grid-scale topography.