diff --git a/CICE/CMakeLists.txt b/CICE/CMakeLists.txt
index 25c67cf..637d520 100644
--- a/CICE/CMakeLists.txt
+++ b/CICE/CMakeLists.txt
@@ -26,7 +26,6 @@ target_sources(OM3_cice PRIVATE
   CICE/cicecore/shared/ice_arrays_column.F90
   CICE/cicecore/shared/ice_calendar.F90
   CICE/cicecore/shared/ice_constants.F90
-  CICE/cicecore/shared/ice_distribution.F90
   CICE/cicecore/shared/ice_domain_size.F90
   CICE/cicecore/shared/ice_fileunits.F90
   CICE/cicecore/shared/ice_init_column.F90
@@ -68,7 +67,6 @@ target_sources(OM3_cice PRIVATE
 
   # Infrastructure
   CICE/cicecore/cicedyn/infrastructure/ice_blocks.F90
-  CICE/cicecore/cicedyn/infrastructure/ice_domain.F90
   CICE/cicecore/cicedyn/infrastructure/ice_grid.F90
   CICE/cicecore/cicedyn/infrastructure/ice_memusage.F90
   CICE/cicecore/cicedyn/infrastructure/ice_memusage_gptl.c
@@ -155,6 +153,9 @@ elseif(OM3_CICE_IO MATCHES "Binary")
   )
 endif()
 
+add_patched_source(OM3_cice CICE/cicecore/cicedyn/infrastructure/ice_domain.F90)
+add_patched_source(OM3_cice CICE/cicecore/shared/ice_distribution.F90)
+
 ### Install and Export
 
 ## Library
diff --git a/CICE/patches/ice_distribution.F90.patch b/CICE/patches/ice_distribution.F90.patch
new file mode 100644
index 0000000..fccefe2
--- /dev/null
+++ b/CICE/patches/ice_distribution.F90.patch
@@ -0,0 +1,16 @@
+diff --git a/cicecore/shared/ice_distribution.F90 b/cicecore/shared/ice_distribution.F90
+old mode 100644
+new mode 100755
+index 0f3f6c1..6e06069
+--- a/cicecore/shared/ice_distribution.F90
++++ b/cicecore/shared/ice_distribution.F90
+@@ -41,7 +41,8 @@ module ice_distribution
+              ice_distributionGet,         &
+              ice_distributionGetBlockLoc, &
+              ice_distributionGetBlockID, &
+-             create_local_block_ids
++             create_local_block_ids, &
++             proc_decomposition 
+ 
+    character (char_len), public :: &
+        processor_shape       ! 'square-pop' (approx) POP default config
diff --git a/CICE/patches/ice_domain.F90.patch b/CICE/patches/ice_domain.F90.patch
new file mode 100644
index 0000000..34cda0e
--- /dev/null
+++ b/CICE/patches/ice_domain.F90.patch
@@ -0,0 +1,71 @@
+diff --git a/cicecore/cicedyn/infrastructure/ice_domain.F90 b/cicecore/cicedyn/infrastructure/ice_domain.F90
+index 8b680f2..cf13fcc 100644
+--- a/cicecore/cicedyn/infrastructure/ice_domain.F90
++++ b/cicecore/cicedyn/infrastructure/ice_domain.F90
+@@ -88,7 +88,7 @@ module ice_domain
+        distribution_wght_file  ! file for distribution_wght=file
+ 
+     integer (int_kind) :: &
+-       nprocs                ! num of processors
++       nprocs, nprocs_x, nprocs_y                ! num of processors
+ 
+ !***********************************************************************
+ 
+@@ -101,7 +101,7 @@ subroutine init_domain_blocks
+ !  This routine reads in domain information and calls the routine
+ !  to set up the block decomposition.
+ 
+-   use ice_distribution, only: processor_shape
++   use ice_distribution, only: processor_shape, proc_decomposition
+    use ice_domain_size, only: ncat, nilyr, nslyr, max_blocks, &
+        nx_global, ny_global, block_size_x, block_size_y
+    use ice_fileunits, only: goto_nml
+@@ -204,6 +204,14 @@ subroutine init_domain_blocks
+ 
+    endif
+ 
++   if (nprocs .ne. -1) then
++      if (my_task == master_task) then
++         write(nu_diag,*) subname//' WARNING: nprocs is deprecated, please remove from namelist'
++      endif
++   endif
++
++   nprocs = get_num_procs()
++
+    call broadcast_scalar(nprocs,            master_task)
+    call broadcast_scalar(processor_shape,   master_task)
+    call broadcast_scalar(distribution_type, master_task)
+@@ -216,10 +224,14 @@ subroutine init_domain_blocks
+    call broadcast_scalar(maskhalo_bound,    master_task)
+    call broadcast_scalar(add_mpi_barriers,  master_task)
+    call broadcast_scalar(debug_blocks,      master_task)
++
++   ! update nprocs_x and nprocs_y
++   call proc_decomposition(nprocs, nprocs_x, nprocs_y)
++   ! set max_blocks
+    if (my_task == master_task) then
+      if (max_blocks < 1) then
+-       max_blocks=( ((nx_global-1)/block_size_x + 1) *         &
+-                    ((ny_global-1)/block_size_y + 1) - 1) / nprocs + 1
++       max_blocks=((nx_global-1)/block_size_x/nprocs_x+1) * &
++                  ((ny_global-1)/block_size_y/nprocs_y+1)
+        max_blocks=max(1,max_blocks)
+        write(nu_diag,'(/,a52,i6,/)') &
+          '(ice_domain): max_block < 1: max_block estimated to ',max_blocks
+@@ -242,16 +254,6 @@ subroutine init_domain_blocks
+       !*** domain size zero or negative
+       !***
+       call abort_ice(subname//' ERROR: Invalid domain: size < 1', file=__FILE__, line=__LINE__) ! no domain
+-   else if (nprocs /= get_num_procs()) then
+-      !***
+-      !*** input nprocs does not match system (eg MPI) request
+-      !***
+-#if (defined CESMCOUPLED)
+-      nprocs = get_num_procs()
+-#else
+-      write(nu_diag,*) subname,' ERROR: nprocs, get_num_procs = ',nprocs,get_num_procs()
+-      call abort_ice(subname//' ERROR: Input nprocs not same as system request', file=__FILE__, line=__LINE__)
+-#endif
+    else if (nghost < 1) then
+       !***
+       !*** must have at least 1 layer of ghost cells