diff --git a/regtests/bin/matrix_cmake_datarmor b/regtests/bin/matrix_cmake_datarmor
index f8ffaaa63..a197d3a03 100755
--- a/regtests/bin/matrix_cmake_datarmor
+++ b/regtests/bin/matrix_cmake_datarmor
@@ -27,7 +27,7 @@ usage ()
 {
 cat 2>&1 << EOF
 
-Usage: $myname model_dir 
+Usage: $myname model_dir
 Required:
   model_dir : path to model dir of WW3 source
 EOF
@@ -51,7 +51,7 @@ main_dir="`cd $main_dir 1>/dev/null 2>&1 && pwd`"
 
 
 # 1. Set up
-   
+
   export np='28'      #number of mpi tasks
   export npl='28'    #number of mpi tasks for ufs applications and large setups
   export npl1='20'   #number of mpi tasks for ufs/large setups (b4b check)
@@ -151,9 +151,10 @@ main_dir="`cd $main_dir 1>/dev/null 2>&1 && pwd`"
   export      shwtr='y' # shallow water tests
   export      unstr='y' # unstructured grid tests
   export      pdlib='y' # unstr with pdlib for domain decomposition and implicit solver
+  export        lmp='y' # Langmuir mixing parameterization
   export      smcgr='y' # SMC grid test
   export        rtd='y' # Rotated pole test
-  export     mudice='y' # Mud/Ice and wave interaction tests 
+  export     mudice='y' # Mud/Ice and wave interaction tests
   export     infgrv='y' # Second harmonic generation tests
   export       uost='y' # ww3_ts4 Unresolved Obstacles Source Term (UOST)
   export      assim='y' # Restart spectra update
@@ -178,17 +179,17 @@ main_dir="`cd $main_dir 1>/dev/null 2>&1 && pwd`"
   export    nth_b4b='y' # Thread Reproducibility
   export       esmf='n' # ESMF coupling
 # export   filter='PR3 ST2 UQ'
-                      # The filter does a set of consecutive greps on the 
+                      # The filter does a set of consecutive greps on the
                       # command lines generated by filter.base with the above
                       # selected options.
 
 # --------------------------------------------------------------------------- #
 # 2.  Execute matrix.base ...                                                 #
 # --------------------------------------------------------------------------- #
-             
+
   $main_dir/../regtests/bin/matrix.base
 
-  $main_dir/../regtests/bin/matrix_divider_cmake.sh 
+  $main_dir/../regtests/bin/matrix_divider_cmake.sh
 
 # --------------------------------------------------------------------------- #
 # End to the matrix                                                           #
diff --git a/regtests/bin/matrix_cmake_milhydro b/regtests/bin/matrix_cmake_milhydro
index 8213b9b33..6be47ab24 100755
--- a/regtests/bin/matrix_cmake_milhydro
+++ b/regtests/bin/matrix_cmake_milhydro
@@ -19,10 +19,10 @@
 #                                                                             #
 # --------------------------------------------------------------------------- #
 usage ()
-{ 
+{
   cat 2>&1 << EOF
 
-  Usage: $myname model_dir 
+  Usage: $myname model_dir
   Required:
     model_dir : path to model dir of WW3 source
 EOF
@@ -41,7 +41,7 @@ EOF
 # Convert main_dir to absolute path
   main_dir="`cd $main_dir 1>/dev/null 2>&1 && pwd`"
 
-# Set batchq queue, choose modules and other custom variables to fit system and 
+# Set batchq queue, choose modules and other custom variables to fit system and
 # to define headers etc (default to original version if empty)
 # 1. Set up
 # 1.a Computer/ user dependent set up
@@ -58,7 +58,7 @@ EOF
 echo "  export path_build_root=$(dirname $main_dir)/regtests/buildmatrix" >> matrix.head
   echo '  [[ -d ${path_build_root} ]] && rm -rf ${path_build_root}'         >> matrix.head
 
-  echo ' ' 
+  echo ' '
 
   if [ "$batchq" = 'slurm' ]
   then
@@ -97,9 +97,10 @@ echo "  export path_build_root=$(dirname $main_dir)/regtests/buildmatrix" >> mat
   export      shwtr='y' # shallow water tests
   export      unstr='y' # unstructured grid tests
   export      pdlib='y' # unstr with pdlib for domain decomposition and implicit solver
+  export        lmp='y' # Langmuir mixing parameterization
   export      smcgr='y' # SMC grid test
   export        rtd='y' # Rotated pole test
-  export     mudice='y' # Mud/Ice and wave interaction tests 
+  export     mudice='y' # Mud/Ice and wave interaction tests
   export     infgrv='y' # Second harmonic generation tests
   export       uost='y' # ww3_ts4 Unresolved Obstacles Source Term (UOST)
   export      assim='y' # Restart spectra update
@@ -124,14 +125,14 @@ echo "  export path_build_root=$(dirname $main_dir)/regtests/buildmatrix" >> mat
   export    npl_b4b='n' # MPI task Reproducibility
   export    nth_b4b='n' # Thread Reproducibility
   export       esmf='n' # ESMF coupling
-                      # The filter does a set of consecutinve greps on the 
+                      # The filter does a set of consecutinve greps on the
                       # command lines generated by filter.base with the above
                       # selected options.
 
 # --------------------------------------------------------------------------- #
 # 2.  Execute matrix.base ...                                                 #
 # --------------------------------------------------------------------------- #
-             
+
 
   $main_dir/../regtests/bin/matrix.base
 
@@ -146,7 +147,7 @@ echo "  export path_build_root=$(dirname $main_dir)/regtests/buildmatrix" >> mat
     do
       echo "sbatch < $file"  >> msuball.sh
     done
-  fi 
+  fi
 
 # --------------------------------------------------------------------------- #
 # End to the matrix                                                           #
diff --git a/regtests/bin/matrix_cmake_ukmo_cray b/regtests/bin/matrix_cmake_ukmo_cray
index fc6cf64b9..a4df5da0a 100755
--- a/regtests/bin/matrix_cmake_ukmo_cray
+++ b/regtests/bin/matrix_cmake_ukmo_cray
@@ -29,7 +29,7 @@ usage ()
 {
   cat 2>&1 << EOF
 
-  Usage: $myname model_dir 
+  Usage: $myname model_dir
   Required:
     model_dir : path to model dir of WW3 source
 EOF
@@ -139,14 +139,15 @@ fi
   export      shwtr='y' # shallow water tests
   export      unstr='y' # unstructured grid tests
   export      pdlib='y' # unstr with pdlib for domain decomposition and implicit solver
+  export        lmp='y' # Langmuir mixing parameterization
   export      smcgr='y' # SMC grid test
   export        rtd='y' # Rotated pole test
-  export     mudice='y' # Mud/Ice and wave interaction tests 
+  export     mudice='y' # Mud/Ice and wave interaction tests
   export     infgrv='y' # Second harmonic generation tests
   export       uost='y' # ww3_ts4 Unresolved Obstacles Source Term (UOST)
   export      assim='y' # Restart spectra update
   export      oasis='y' # Atmosphere, ocean, and ice coupling using oasis
-  export   calendar='y' # Calendar type 
+  export   calendar='y' # Calendar type
   export   confignc='y' # Configurable netCDF meta data (ww3_ounf)
 
   export    multi01='y' # mww3_test_01 (wetting and drying)
@@ -166,14 +167,14 @@ fi
   export    nth_b4b='y' # Thread Reproducibility
   export       esmf='n' # ESMF coupling
 # export   filter='PR3 ST2 UQ'
-                      # The filter does a set of consecutinve greps on the 
+                      # The filter does a set of consecutinve greps on the
                       # command lines generated by filter.base with the above
                       # selected options.
 
 # --------------------------------------------------------------------------- #
 # 2.  Execute matrix.base ...                                                 #
 # --------------------------------------------------------------------------- #
-             
+
   $main_dir/../regtests/bin/matrix.base
 
   $main_dir/../regtests/bin/matrix_divider_cmake.sh