diff --git a/bld/namelist_files/namelist_defaults_ctsm.xml b/bld/namelist_files/namelist_defaults_ctsm.xml
index d5d8bc08eb..bea8f56427 100644
--- a/bld/namelist_files/namelist_defaults_ctsm.xml
+++ b/bld/namelist_files/namelist_defaults_ctsm.xml
@@ -441,7 +441,9 @@ attributes from the config_cache.xml file (with keys converted to upper-case).
 <reset_snow_glc_ela>1.e9</reset_snow_glc_ela>
 
 <snow_cover_fraction_method>SwensonLawrence2012</snow_cover_fraction_method>
+
 <snow_thermal_cond_method>Jordan1991</snow_thermal_cond_method>
+<snow_thermal_cond_method phys="clm5_1">Sturm1997</snow_thermal_cond_method>
 
 <!-- Default glacier behavior is:
      Mountain glaciers: single_at_atm_topo
@@ -484,7 +486,7 @@ attributes from the config_cache.xml file (with keys converted to upper-case).
 <!-- The default filenames are given relative to the root directory
      for the CLM2 data in the CESM distribution -->
 <!-- Plant function types (relative to {csmdata}) -->
-<paramfile phys="clm5_1" >lnd/clm2/paramdata/ctsm51_params.c240105.nc</paramfile>
+<paramfile phys="clm5_1" >/glade/campaign/cgd/tss/people/oleson/modify_param/ctsm51_params.c240201.nc</paramfile>
 <paramfile phys="clm5_0" >lnd/clm2/paramdata/clm50_params.c240105.nc</paramfile>
 <paramfile phys="clm4_5" >lnd/clm2/paramdata/clm45_params.c240105.nc</paramfile>
 
@@ -1625,7 +1627,8 @@ use_crop=".true.">lnd/clm2/surfdata_map/ctsm5.1.dev052/landuse.timeseries_mpasa1
 <snicar_solarspec    >mid_latitude_winter</snicar_solarspec>
 <snicar_dust_optics  >sahara</snicar_dust_optics>
 <snicar_snodst_intmix>.false.</snicar_snodst_intmix>
-<snicar_snobc_intmix >.false.</snicar_snobc_intmix>
+<snicar_snobc_intmix>.false.</snicar_snobc_intmix>
+<snicar_snobc_intmix phys="clm5_1">.true.</snicar_snobc_intmix>
 <snicar_use_aerosol  >.true.</snicar_use_aerosol>
 <do_sno_oc           >.false.</do_sno_oc>