modi_glt_oceflx_r.F90

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! =======================================================================
! ======================== MODULE modi_glt_oceflx_r =========================
! =======================================================================
!
! Goal:
! -----
!   Transform sea ice ablation/accretion or snow ablation into salt, 
! water and heat fluxes directed to the ocean.
!
! Method:
! -------
!   For every category of ice or snow involved in melting / freezing 
! in the grid cell, the following quantities are needed:
!    - mass (kg.m-2)
!    - massic gltools_enthalpy (J.kg-1)
!    - salt (g.kg-1) 
!   As Gelato can be coupled to rigid lid models (that need a virtual 
! freshwater flux) or a free-surface model (that need a virtual 
! freshwater flux and a water mass flux). A heat flux is also 
! computed
! 
! Remarks:
! --------
!   Note that dmass (the provided mass of melted ice or snow) are 
! in kg.m-2. In the case of sea ice:
!            (sea ice density) * (fraction) * (thickness variation).
! 
!
! Created : 2001/07 (D. Salas y Melia)
!           Taken out from imod_thermo_ice.f90 routine (rigid lid 
!           assumption is made). 
!
! Modified: 2002/10 (D. Salas y Melia)
!           Introduction of free surface approach.
!
! Modified: 2009/06 (D. Salas y Melia) reduced grid
!
! Modified: 2009/12 (D. Salas y Melia) make glt_updtfl consistent with the
!  new gltools_enthalpy formulation in Gelato.
!
! ---------------------- BEGIN MODULE modi_glt_oceflx_r ---------------------
!
!THXS_SFX!MODULE modi_glt_oceflx_r
!THXS_SFX!INTERFACE 
!THXS_SFX!!
!THXS_SFX!SUBROUTINE glt_oceflx_r( tpdom,pustar,tpmxl )
!THXS_SFX!!
!THXS_SFX!  USE modd_types_glt
!THXS_SFX!  USE modd_glt_param
!THXS_SFX!  TYPE(t_dom), DIMENSION(np), INTENT(in) ::  &
!THXS_SFX!        tpdom
!THXS_SFX!  REAL, DIMENSION(np), INTENT(in) ::  &
!THXS_SFX!        pustar
!THXS_SFX!  TYPE(t_mxl), DIMENSION(np), INTENT(inout) ::  &
!THXS_SFX!        tpmxl
!THXS_SFX!END SUBROUTINE glt_oceflx_r
!THXS_SFX!!
!THXS_SFX!END INTERFACE
!THXS_SFX!END MODULE modi_glt_oceflx_r
!
! ---------------------- END MODULE modi_glt_oceflx_r -----------------------
!
!
!
! -----------------------------------------------------------------------
! ------------------------- SUBROUTINE glt_oceflx_r -------------------------
!
SUBROUTINE glt_oceflx_r( tpdom,pustar,tpmxl )
!
  USE modd_glt_const_thm
  USE modd_glt_const_evp     ! omega
  USE modd_types_glt
  USE modd_glt_param
  USE modi_glt_salflx_r
!
  IMPLICIT NONE
!
! .. Arguments
!
  TYPE(t_dom), DIMENSION(np), INTENT(in) ::  &
        tpdom
  REAL, DIMENSION(np), INTENT(in) ::  &
        pustar
  TYPE(t_mxl), DIMENSION(np), INTENT(inout) ::  &
        tpmxl
!
! .. Local variables
!
! G_mole_T,G_mole_S molecular diffusion terms for heat/salt
!   G_mole_T = 12.5 * 13.8d0**(2d0/3d0) - 6. = 65.9d0
!   G_mole_S = 12.5 * 2432d0**(2d0/3d0) - 6. = 2255d0
  REAL, PARAMETER ::  &
        ppg_mole_t = 65.9d0 , ppg_mole_s = 2255d0
!
! g_T,g_S turbulent exchange velocities (m/s)
!   G_turb turbulent diffusion term
  REAL, DIMENSION(np) ::  &
        zg_turb,zg_t,zg_s
!
  REAL, DIMENSION(np) ::  &
        zfcor,zustar
!
!
!
! 1. Initializations
! ===================
!
! Coriolis parameter
!
zfcor(:) = 2. * omega * abs( sin( tpdom(:)%lat ) )
!
! Bound ustar
!
zustar(:) = max( pustar,0.005 )
!
! Calculate turbulent exchange velocities zg_T, zg_S
!   G_turb = (1/k) ln (u* E n^2 / f h) + 1 / (2 E n) - (1/k)
!          = 2.5 ln ( 5300*(u*)^2/coriol ) + 9.62 - 2.5 (assuming n=1)
! Note: n could theoretically depend on the buoyancy flux
!
zg_turb(:) = 2.5d0 * log( 5300.*zustar(:)*zustar(:)/zfcor(:) ) + 7.12d0
!
! Calculate exchange coefficient
!   g  = u* / ( G_turb + G_mole )
!
zg_t(:) = zustar(:) / ( zg_turb(:) + ppg_mole_t )
zg_s(:) = zustar(:) / ( zg_turb(:) + ppg_mole_s )
!
!
!
! 2. Compute ocean-ice fluxes
! ============================
!
tpmxl(:)%qoc = rhosw * cpsw * zg_t(:) *  &
  max( tpmxl(:)%tml-tpmxl(:)%mlf, 0. )
!
END SUBROUTINE glt_oceflx_r
!
! ----------------------- END SUBROUTINE glt_oceflx_r -----------------------
! -----------------------------------------------------------------------