diff --git a/cime_config/buildnml b/cime_config/buildnml
index 8124c59..b8909aa 100755
--- a/cime_config/buildnml
+++ b/cime_config/buildnml
@@ -40,10 +40,17 @@ def _create_namelists(case, confdir, inst_string, infile, nmlgen, data_list_path
     #----------------------------------------------------
     config = {}
     config['mosart_mode'] = case.get_value("MOSART_MODE")
+    config['ignore_warn'] = case.get_value("MOSART_IGNORE_WARNINGS")
     config['clm_accel'] = case.get_value("CLM_ACCELERATED_SPINUP")
+    ignore_msg = "\n (Set MOSART_IGNORE_WARNINGS to TRUE with xmlchange in your case to ignore this message and continue anyway)"
     if ( config['clm_accel'] != "off" ):
-       config['mosart_mode'] = "NULL"
-       case.set_value( "MOSART_MODE", config['mosart_mode'] )
+       if ( config['mosart_mode'] != "NULL" ):
+           message = "CLM_ACCELERATED_SPINUP is not off, but MOSART_MODE is not NULL, " + \
+                      "normally you should switch it off to save computer time"
+           if ( not config['ignore_warn'] ):
+               expect(False, message+ignore_msg )
+           else:
+               logger.warning( "WARNING::"+message )
 
     config['mosart_flood_mode'] = case.get_value("MOSART_FLOOD_MODE")
     config['rof_grid'] = case.get_value("ROF_GRID")
diff --git a/cime_config/config_component.xml b/cime_config/config_component.xml
index aae8beb..84b4619 100644
--- a/cime_config/config_component.xml
+++ b/cime_config/config_component.xml
@@ -35,6 +35,15 @@
     <desc>mode for mosart model, NULL means mosart is turned off</desc>
   </entry>
 
+  <entry id="MOSART_IGNORE_WARNINGS">
+    <type>logical</type>
+    <valid_values>TRUE,FALSE</valid_values>
+    <default_value>FALSE</default_value>
+    <group>run_component_mosart</group>
+    <file>env_run.xml</file>
+    <desc>If warnings in namelist setttings from buildnml should be ignored or not</desc>
+  </entry>
+
   <entry id="MOSART_FLOOD_MODE">
     <type>char</type>
     <valid_values>ACTIVE,NULL</valid_values>
diff --git a/cime_config/testdefs/testlist_mosart.xml b/cime_config/testdefs/testlist_mosart.xml
index d3e235e..973e788 100644
--- a/cime_config/testdefs/testlist_mosart.xml
+++ b/cime_config/testdefs/testlist_mosart.xml
@@ -47,13 +47,13 @@
       <option name="comment"  >Test with MCT and MOSART off</option>
     </options>
   </test>
-  <test name="SMS_Lh3" grid="f10_f10_mg37" compset="I2000Clm51Sp" testmods="mosart/clmAccelSpinup">
+  <test name="SMS_Lh3" grid="f10_f10_mg37" compset="I2000Clm51Sp" testmods="mosart/clmAccelSpinupIgnoreWarn">
     <machines>
       <machine name="cheyenne" compiler="gnu" category="mosart"></machine>
     </machines>
     <options>
       <option name="wallclock">00:20:00</option>
-      <option name="comment"  >Test with CLM accelerated spinup, which should turn MOSART off</option>
+      <option name="comment"  >Test with CLM accelerated spinup, but ignore warnigns so it will send a warning but still run</option>
     </options>
   </test>
   <test name="SMS_Lh3" grid="1x1_brazil" compset="I2000Clm50Sp" testmods="mosart/mosartGridNull">
diff --git a/cime_config/testdefs/testmods_dirs/mosart/clmAccelSpinup/shell_commands b/cime_config/testdefs/testmods_dirs/mosart/clmAccelSpinup/shell_commands
deleted file mode 100755
index 3dc3446..0000000
--- a/cime_config/testdefs/testmods_dirs/mosart/clmAccelSpinup/shell_commands
+++ /dev/null
@@ -1 +0,0 @@
-./xmlchange CLM_ACCELERATED_SPINUP=on
diff --git a/cime_config/testdefs/testmods_dirs/mosart/clmAccelSpinupIgnoreWarn/shell_commands b/cime_config/testdefs/testmods_dirs/mosart/clmAccelSpinupIgnoreWarn/shell_commands
new file mode 100755
index 0000000..da7655c
--- /dev/null
+++ b/cime_config/testdefs/testmods_dirs/mosart/clmAccelSpinupIgnoreWarn/shell_commands
@@ -0,0 +1,2 @@
+./xmlchange CLM_ACCELERATED_SPINUP=on
+./xmlchange MOSART_IGNORE_WARNINGS=TRUE
diff --git a/docs/ChangeLog b/docs/ChangeLog
index 784a429..ab52ebb 100644
--- a/docs/ChangeLog
+++ b/docs/ChangeLog
@@ -1,3 +1,17 @@
+===============================================================
+Tag name:  mosart1_0_45
+Originator(s): erik
+Date: Nov 12, 2021
+One-line Summary: Handle CLM_ACCELERATED_SPINUP option differently
+
+Handle CLM_ACCELERATED_SPINUP option differently so it doesn't change 
+MOSART_MODE, but dies (unless the new xml variable MOSART_IGNORE_WARNINGS 
+is set to TRUE). Also only output information about decomposition from all 
+PE's only if running with DEBUG compiler options set.
+
+Fixes #48 -- Remove setting of MOSART_MODE from buildnml
+Fixes #49 -- Reduce MOSART output to cesm.log
+
 ===============================================================
 Tag name:  mosart1_0_44
 Originator(s): erik
diff --git a/src/riverroute/RtmMod.F90 b/src/riverroute/RtmMod.F90
index a02a565..14cf0c6 100644
--- a/src/riverroute/RtmMod.F90
+++ b/src/riverroute/RtmMod.F90
@@ -181,7 +181,11 @@ subroutine Rtmini(flood_active)
     character(len=256):: locfn                ! local file name
     character(len=16384) :: rList             ! list of fields for SM multiply
     integer           :: unitn                ! unit for namelist file
+#ifdef NDEBUG
+    integer,parameter :: dbug = 0             ! 0 = none, 1=normal, 2=much, 3=max
+#else
     integer,parameter :: dbug = 3             ! 0 = none, 1=normal, 2=much, 3=max
+#endif
     logical :: lexist                         ! File exists
     character(len= 7) :: runtyp(4)            ! run type
     integer ,allocatable :: gindex(:)         ! global index
@@ -1409,7 +1413,6 @@ subroutine Rtmrun(rstwr,nlend,rdate)
     character(len=256) :: filer             ! restart file name
     integer  :: cnt                         ! counter for gridcells
     integer  :: ier                         ! error code
-    integer,parameter  :: dbug = 1          ! local debug flag
 
 ! parameters used in negative runoff partitioning algorithm
     real(r8) :: river_volume_minimum        ! gridcell area multiplied by average river_depth_minimum [m3]