Add finidat for ne30np4.pg3 from @olyson /glade/p/cgd/tss/people/oles…

…on/CLM5_restarts/ctsm51_cesm23a14a_ne30pg3ne30pg3mg17_CPLHIST_1850pAD.clm2.r.0561-01-01-00000.nc

bld/namelist_files/namelist_defaults_ctsm.xml

@@ -680,6 +680,7 @@ attributes from the config_cache.xml file (with keys converted to upper-case).
   set up. If more finidat files are added you may need to add more of these.
   Or one specific file will be chosen over another.
 -->
+
 <init_interp_attributes sim_year="1850" use_cndv=".false." use_fates=".false." lnd_tuning_mode="clm4_5_GSWP3v1"
 >hgrid=0.9x1.25 maxpft=17 mask=gx1v7 use_cn=.true. use_crop=.false. irrigate=.true. glc_nec=10 do_transient_pfts=.false.
 </init_interp_attributes>
@@ -724,6 +725,12 @@ attributes from the config_cache.xml file (with keys converted to upper-case).
 >hgrid=0.9x1.25 maxpft=79 mask=gx1v7 use_cn=.true. use_crop=.true. irrigate=.false. glc_nec=10 do_transient_pfts=.false.
 </init_interp_attributes>
 
+<!-- 1850 spinup for CESM3 development for CLM5.1-->
+<init_interp_attributes sim_year="1850" use_cndv=".false." use_fates=".false." lnd_tuning_mode="clm5_1_cam6.0"
+                        hgrid="ne30np4.pg3"
+>hgrid=ne30np4.pg3 maxpft=79 mask=gx1v7 use_cn=.true. use_crop=.true. irrigate=.false. glc_nec=10 do_transient_pfts=.false.
+</init_interp_attributes>
+
 <!-- present day -->
 <init_interp_attributes sim_year="2000" use_cndv=".false." use_fates=".false." lnd_tuning_mode="clm4_5_GSWP3v1"
 >hgrid=1.9x2.5 maxpft=79 mask=gx1v7 use_cn=.true. use_crop=.true. irrigate=.true. glc_nec=10 do_transient_pfts=.false.
@@ -875,7 +882,7 @@ attributes from the config_cache.xml file (with keys converted to upper-case).
                         hgrid="ne0np4.ARCTICGRIS.ne30x8" use_cn=".false." maxpft="17"
 >hgrid=ne0np4.ARCTICGRIS.ne30x8 maxpft=17 mask=tx0.1v2 use_cn=.false. use_crop=.false. irrigate=.true. glc_nec=10 do_transient_pfts=.false.
 </init_interp_attributes>
-p
+
 <!-- 2003 -->
 <init_interp_attributes sim_year="2003" use_cndv=".false." use_fates=".false." lnd_tuning_mode="clm5_0_cam6.0"
                         hgrid="1.9x2.5" use_cn=".false." maxpft="17"
@@ -968,6 +975,14 @@ p
 >lnd/clm2/initdata_map/clmi.I1850Clm50BgcCrop-ciso.1366-01-01.0.9x1.25_gx1v7_simyr1850_c200428.nc
 </finidat>
 
+<!-- CESM3 dev spinup -->
+<finidat hgrid="ne30np4.pg3"  maxpft="79"  mask="gx1v7" use_cn=".true." use_cndv=".false." use_fates=".false."
+         ic_ymd="18500101" sim_year="1850" do_transient_pfts=".false."
+         ic_tod="0" glc_nec="10" use_crop=".true." irrigate=".false."
+         lnd_tuning_mode="clm5_1_cam6.0"
+>lnd/clm2/initdata_map/clmi.I1850Clm51CplhistBgcCrop-ciso.0561-01-01.ne30np4.pg3_gx1v7_simyr1850_c230717.nc
+</finidat>
+
 <!--
      Present day IC (if use_init_interp is set and .true. then MUST still interpolate even on an exact match)
                     (if it will work on an exact match, leave use_init_interp off)