diff --git a/obl_main.f90 b/obl_main.f90
index 093076022a406d31ce175c771291d77343fbcb31..2ea67f9e595dbe3eb49ae544395655fc80a22036 100644
--- a/obl_main.f90
+++ b/obl_main.f90
@@ -90,7 +90,7 @@ program obl_main
     real, parameter :: Cd0 = 0.001      ! bottom drag coefficient
 
     real :: mld, mld_ref                    ! mixed layer depth (model & reference), [m]
-    real, parameter :: N2_ref = 0.00044     ! reference N**2 (using in mld ref. estimate), [1/s**2]
+    real, parameter :: N2_ref = 0.000044    ! reference N**2 (using in mld ref. estimate), [1/s**2]
     
     ! command line arguments & configuration file variables
     ! --------------------------------------------------------------------------------
diff --git a/obl_pph.f90 b/obl_pph.f90
index 23676434aa6032d945e75f9f8accddae0d0745db..53c33da6f0bbf9ad139209f74fa7f51392f109f4 100644
--- a/obl_pph.f90
+++ b/obl_pph.f90
@@ -34,7 +34,7 @@ module obl_pph
         real :: kappa = 0.4         !< von Karman constant, [n/d]
         real :: PrT0 = 1.0          !< neutral Prandtl number, [n/d]
 
-        real :: c_S2_min = 1e-5     !< min shear frequency, [(1/s)**2]
+        real :: c_S2_min = 1e-4     !< min shear frequency, [(1/s)**2]
     end type
 
     contains