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Changeset 12334 for NEMO/branches/UKMO/NEMO_4.0.1_remove_0.1m_snow_test/src/ICE/icethd_zdf_bl99.F90 – NEMO

Ignore:
Timestamp:
2020-01-21T16:04:26+01:00 (4 years ago)
Author:
dancopsey
Message:

Make isnow a fraction of the sea ice that is snow covered.

File:
1 edited

Legend:

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  • NEMO/branches/UKMO/NEMO_4.0.1_remove_0.1m_snow_test/src/ICE/icethd_zdf_bl99.F90

    r12333 r12334  
    9494      REAL(wp) ::   ztsu_err  =  1.e-5_wp     ! range around which t_su is considered at 0C  
    9595      REAL(wp) ::   zdti_bnd  =  1.e-4_wp     ! maximal authorized error on temperature  
    96       REAL(wp) ::   zhs_min   =  0.01_wp      ! minimum snow thickness for conductivity calculation  
     96      REAL(wp) ::   zhs_min   =  0.1_wp       ! minimum snow thickness for conductivity calculation  
    9797      REAL(wp) ::   ztmelts                   ! ice melting temperature 
    9898      REAL(wp) ::   zdti_max                  ! current maximal error on temperature  
     
    101101      REAL(wp) ::   zfac                      ! dummy factor 
    102102      ! 
    103       REAL(wp), DIMENSION(jpij) ::   isnow        ! switch for presence (1) or absence (0) of snow 
     103      REAL(wp), DIMENSION(jpij) ::   isnow        ! fraction of sea ice that is snow covered (for thermodynamic use only) 
    104104      REAL(wp), DIMENSION(jpij) ::   ztsub        ! surface temperature at previous iteration 
    105105      REAL(wp), DIMENSION(jpij) ::   zh_i, z1_h_i ! ice layer thickness 
     
    147147      !------------------ 
    148148      DO ji = 1, npti 
    149          isnow(ji) = 1._wp - MAX( 0._wp , SIGN(1._wp, - h_s_1d(ji) ) )  ! is there snow or not 
     149 
     150         ! If the snow thickness drops below zhs_min then reduce the snow fraction instead 
     151         IF( h_s_1d(ji) < zhs_min ) THEN 
     152           isnow(ji) = h_s_1d(ji) / zhs_min 
     153           zh_s(ji) = zhs_min * r1_nlay_s 
     154         ELSE 
     155           isnow(ji) = 1.0_wp 
     156           zh_s(ji) = h_s_1d(ji) * r1_nlay_s 
     157         END IF 
     158 
    150159         ! layer thickness 
    151160         zh_i(ji) = h_i_1d(ji) * r1_nlay_i 
    152          zh_s(ji) = h_s_1d(ji) * r1_nlay_s 
     161 
    153162      END DO 
    154163      ! 
     
    156165      ELSEWHERE                         ;   z1_h_i(1:npti) = 0._wp 
    157166      END WHERE 
    158       ! 
    159       WHERE( zh_s(1:npti) > 0._wp   )       zh_s(1:npti) = MAX( zhs_min * r1_nlay_s, zh_s(1:npti) ) 
    160167      ! 
    161168      WHERE( zh_s(1:npti) > 0._wp   )   ;   z1_h_s(1:npti) = 1._wp / zh_s(1:npti) 
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