diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7304bb44d286676181f42cfd59babecc94f68240..277b8a64ccf8ff9e3aa48a89706c5012f7bea8aa 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -69,6 +69,7 @@ set(SOURCES_F
srcF/sfx_run.f90
srcF/sfx_phys_const.f90
srcF/sfx_surface.f90
+ srcF/sfx_thermal_roughness.f90
srcF/sfx_most.f90
srcF/sfx_most_param.f90
srcF/sfx_sheba.f90
diff --git a/srcF/sfx_surface.f90 b/srcF/sfx_surface.f90
index 79ebca981a43d1dc6b1bfe91a939f78aacc26b59..8b808f596881aa2f2ce54f3b2275897609c4920a 100644
--- a/srcF/sfx_surface.f90
+++ b/srcF/sfx_surface.f90
@@ -132,6 +132,7 @@ contains
surface_param%B_max_land = B_max_land
end subroutine set_c_struct_sfx_surface_param_values
#endif
+
! charnock roughness definition
! --------------------------------------------------------------------------------
subroutine get_charnock_roughness(z0_m, u_dyn0, U, h, maxiters)
diff --git a/srcF/sfx_thermal_roughness.f90 b/srcF/sfx_thermal_roughness.f90
new file mode 100644
index 0000000000000000000000000000000000000000..04755f763e1c847fcaff4ec8b5d049086c3fee3e
--- /dev/null
+++ b/srcF/sfx_thermal_roughness.f90
@@ -0,0 +1,141 @@
+module sfx_thermal_roughness
+ !< @brief surface thermal roughness parameterizations
+
+ ! modules used
+ ! --------------------------------------------------------------------------------
+ use sfx_phys_const
+ use sfx_surface
+ ! --------------------------------------------------------------------------------
+
+ ! directives list
+ ! --------------------------------------------------------------------------------
+ implicit none
+ ! --------------------------------------------------------------------------------
+
+ ! public interface
+ ! --------------------------------------------------------------------------------
+ public :: get_thermal_roughness_kl
+ public :: get_thermal_roughness_cz
+ public :: get_thermal_roughness_zi
+ public :: get_thermal_roughness_ca
+ ! --------------------------------------------------------------------------------
+
+ ! --------------------------------------------------------------------------------
+ real, parameter, private :: kappa = 0.40 !< von Karman constant [n/d]
+ ! --------------------------------------------------------------------------------
+
+contains
+
+
+ ! thermal roughness definition by (Kazakov, Lykosov)
+ ! --------------------------------------------------------------------------------
+ subroutine get_thermal_roughness_kl(z0_t, B, &
+ z0_m, Re, surface_type)
+ ! ----------------------------------------------------------------------------
+ real, intent(out) :: z0_t !< thermal roughness [m]
+ real, intent(out) :: B !< = log(z0_m / z0_t) [n/d]
+
+ real, intent(in) :: z0_m !< aerodynamic roughness [m]
+ real, intent(in) :: Re !< roughness Reynolds number [n/d]
+ integer, intent(in) :: surface_type !< = [ocean] || [land] || [lake]
+ ! ----------------------------------------------------------------------------
+
+ ! --- local variables
+ ! ----------------------------------------------------------------------------
+
+ !--- define B = log(z0_m / z0_t)
+ if (Re <= Re_rough_min) then
+ B = B1_rough * alog(B3_rough * Re) + B2_rough
+ else
+ ! *: B4 takes into account Re value at z' ~ O(10) z0
+ B = B4_rough * (Re**B2_rough)
+ end if
+
+ ! --- apply max restriction based on surface type
+ if (surface_type == surface_ocean) then
+ B = min(B, B_max_ocean)
+ else if (surface_type == surface_lake) then
+ B = min(B, B_max_lake)
+ else if (surface_type == surface_land) then
+ B = min(B, B_max_land)
+ end if
+
+ ! --- define roughness [thermal]
+ z0_t = z0_m / exp(B)
+
+ end subroutine
+ ! --------------------------------------------------------------------------------
+
+ ! thermal roughness definition by (Chen, F., Zhang, Y., 2009)
+ ! --------------------------------------------------------------------------------
+ subroutine get_thermal_roughness_cz(z0_t, B, &
+ z0_m, Re, surface_type)
+ ! ----------------------------------------------------------------------------
+ real, intent(out) :: z0_t !< thermal roughness [m]
+ real, intent(out) :: B !< = log(z0_m / z0_t) [n/d]
+
+ real, intent(in) :: z0_m !< aerodynamic roughness [m]
+ real, intent(in) :: Re !< roughness Reynolds number [n/d]
+ integer, intent(in) :: surface_type !< = [ocean] || [land] || [lake]
+
+ ! --- local variables
+ ! ----------------------------------------------------------------------------
+
+ !--- define B = log(z0_m / z0_t)
+ B = (kappa * 10.0**(-0.4 * z0_m / 0.07)) * (Re**0.45)
+
+ ! --- define roughness [thermal]
+ z0_t = z0_m / exp(B)
+
+ end subroutine
+ ! --------------------------------------------------------------------------------
+
+ ! thermal roughness definition by (Zilitinkevich, S., 1995)
+ ! --------------------------------------------------------------------------------
+ subroutine get_thermal_roughness_zi(z0_t, B, &
+ z0_m, Re, surface_type)
+ ! ----------------------------------------------------------------------------
+ real, intent(out) :: z0_t !< thermal roughness [m]
+ real, intent(out) :: B !< = log(z0_m / z0_t) [n/d]
+
+ real, intent(in) :: z0_m !< aerodynamic roughness [m]
+ real, intent(in) :: Re !< roughness Reynolds number [n/d]
+ integer, intent(in) :: surface_type !< = [ocean] || [land] || [lake]
+
+ ! --- local variables
+ ! ----------------------------------------------------------------------------
+
+ !--- define B = log(z0_m / z0_t)
+ B = 0.1 * kappa * (Re**0.5)
+
+ ! --- define roughness [thermal]
+ z0_t = z0_m / exp(B)
+
+ end subroutine
+ ! --------------------------------------------------------------------------------
+
+ ! thermal roughness definition by (Cahill, A.T., Parlange, M.B., Albertson, J.D., 1997)
+ ! --------------------------------------------------------------------------------
+ subroutine get_thermal_roughness_ca(z0_t, B, &
+ z0_m, Re, surface_type)
+ ! ----------------------------------------------------------------------------
+ real, intent(out) :: z0_t !< thermal roughness [m]
+ real, intent(out) :: B !< = log(z0_m / z0_t) [n/d]
+
+ real, intent(in) :: z0_m !< aerodynamic roughness [m]
+ real, intent(in) :: Re !< roughness Reynolds number [n/d]
+ integer, intent(in) :: surface_type !< = [ocean] || [land] || [lake]
+
+ ! --- local variables
+ ! ----------------------------------------------------------------------------
+
+ !--- define B = log(z0_m / z0_t)
+ B = 2.46 * (Re**0.25) - 3.8
+
+ ! --- define roughness [thermal]
+ z0_t = z0_m / exp(B)
+
+ end subroutine
+ ! --------------------------------------------------------------------------------
+
+end module sfx_thermal_roughness