[152] | 1 | MODULE albedo |
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| 2 | !!====================================================================== |
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| 3 | !! *** MODULE albedo *** |
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| 4 | !! Ocean forcing: bulk thermohaline forcing of the ocean (or ice) |
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| 5 | !!===================================================================== |
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| 6 | !!---------------------------------------------------------------------- |
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| 7 | !! flx_blk_albedo : albedo for ocean and ice (clear and overcast skies) |
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| 8 | !!---------------------------------------------------------------------- |
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| 9 | !! * Modules used |
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| 10 | USE oce ! ocean dynamics and tracers |
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| 11 | USE dom_oce ! ocean space and time domain |
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| 12 | USE cpl_oce ! ??? |
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| 13 | USE phycst ! physical constants |
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| 14 | USE daymod |
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| 15 | USE blk_oce ! bulk variables |
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| 16 | USE flx_oce ! forcings variables |
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| 17 | USE ocfzpt ! ??? |
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| 18 | USE in_out_manager |
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| 19 | USE lbclnk |
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| 20 | |
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| 21 | IMPLICIT NONE |
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| 22 | PRIVATE |
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| 23 | |
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| 24 | !! * Accessibility |
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| 25 | PUBLIC flx_blk_albedo ! routine called by limflx.F90 in coupled |
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| 26 | ! and in flxblk.F90 in forced |
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| 27 | !! * Module variables |
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| 28 | REAL(wp) :: & ! constant values |
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| 29 | zzero = 0.e0 , & |
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| 30 | zone = 1.0 |
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| 31 | |
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| 32 | !! * constants for albedo computation (flx_blk_albedo) |
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| 33 | REAL(wp) :: & |
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| 34 | c1 = 0.05 , & ! constants values |
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| 35 | c2 = 0.10 , & |
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| 36 | albice = 0.50 , & ! albedo of melting ice in the arctic and antarctic (Shine & Hendersson-Sellers) |
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| 37 | cgren = 0.06 , & ! correction of the snow or ice albedo to take into account |
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| 38 | ! effects of cloudiness (Grenfell & Perovich, 1984) |
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| 39 | alphd = 0.80 , & ! coefficients for linear interpolation used to compute |
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| 40 | alphdi = 0.72 , & ! albedo between two extremes values (Pyane, 1972) |
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| 41 | alphc = 0.65 , & |
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| 42 | zmue = 0.40 ! cosine of local solar altitude |
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| 43 | |
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| 44 | !!---------------------------------------------------------------------- |
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| 45 | !! OPA 9.0 , LODYC-IPSL (2004) |
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| 46 | !!---------------------------------------------------------------------- |
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| 47 | |
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| 48 | CONTAINS |
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| 49 | |
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| 50 | #if defined key_ice_lim |
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| 51 | !!---------------------------------------------------------------------- |
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| 52 | !! 'key_ice_lim' LIM ice model |
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| 53 | !!---------------------------------------------------------------------- |
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| 54 | |
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| 55 | SUBROUTINE flx_blk_albedo( palb , palcn , palbp , palcnp ) |
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| 56 | !!---------------------------------------------------------------------- |
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| 57 | !! *** ROUTINE flx_blk_albedo *** |
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| 58 | !! |
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| 59 | !! ** Purpose : Computation of the albedo of the snow/ice system |
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| 60 | !! as well as the ocean one |
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| 61 | !! |
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| 62 | !! ** Method : - Computation of the albedo of snow or ice (choose the |
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| 63 | !! rignt one by a large number of tests |
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| 64 | !! - Computation of the albedo of the ocean |
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| 65 | !! |
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| 66 | !! References : |
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| 67 | !! Shine and Hendersson-Sellers 1985, JGR, 90(D1), 2243-2250. |
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| 68 | !! |
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| 69 | !! History : |
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| 70 | !! 8.0 ! 01-04 (LIM 1.0) |
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| 71 | !! 8.5 ! 03-07 (C. Ethe, G. Madec) Optimization (old name:shine) |
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| 72 | !!---------------------------------------------------------------------- |
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| 73 | !! * Modules used |
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| 74 | USE ice ! ??? |
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| 75 | |
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| 76 | !! * Arguments |
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| 77 | REAL(wp), DIMENSION(jpi,jpj), INTENT(out) :: & |
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| 78 | palb , & ! albedo of ice under overcast sky |
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| 79 | palcn , & ! albedo of ocean under overcast sky |
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| 80 | palbp , & ! albedo of ice under clear sky |
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| 81 | palcnp ! albedo of ocean under clear sky |
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| 82 | |
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| 83 | !! * Local variables |
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| 84 | INTEGER :: & |
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| 85 | ji, jj ! dummy loop indices |
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| 86 | REAL(wp) :: & |
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| 87 | zmue14 , & ! zmue**1.4 |
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| 88 | zalbpsnm , & ! albedo of ice under clear sky when snow is melting |
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| 89 | zalbpsnf , & ! albedo of ice under clear sky when snow is freezing |
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| 90 | zalbpsn , & ! albedo of snow/ice system when ice is coverd by snow |
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| 91 | zalbpic , & ! albedo of snow/ice system when ice is free of snow |
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| 92 | zithsn , & ! = 1 for hsn >= 0 ( ice is cov. by snow ) ; = 0 otherwise (ice is free of snow) |
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| 93 | zitmlsn , & ! = 1 freezinz snow (sist >=rt0_snow) ; = 0 melting snow (sist<rt0_snow) |
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| 94 | zihsc1 , & ! = 1 hsn <= c1 ; = 0 hsn > c1 |
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| 95 | zihsc2 ! = 1 hsn >= c2 ; = 0 hsn < c2 |
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| 96 | REAL(wp), DIMENSION(jpi,jpj) :: & |
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| 97 | zalbfz , & ! ( = alphdi for freezing ice ; = albice for melting ice ) |
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| 98 | zficeth ! function of ice thickness |
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| 99 | LOGICAL , DIMENSION(jpi,jpj) :: & |
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| 100 | llmask |
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| 101 | !!--------------------------------------------------------------------- |
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| 102 | |
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| 103 | !------------------------- |
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| 104 | ! Computation of zficeth |
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| 105 | !-------------------------- |
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| 106 | |
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| 107 | llmask = (hsnif == 0.e0) .AND. ( sist >= rt0_ice ) |
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| 108 | WHERE ( llmask ) ! ice free of snow and melts |
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| 109 | zalbfz = albice |
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| 110 | ELSEWHERE |
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| 111 | zalbfz = alphdi |
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| 112 | END WHERE |
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| 113 | |
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| 114 | DO jj = 1, jpj |
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| 115 | DO ji = 1, jpi |
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| 116 | IF( hicif(ji,jj) > 1.5 ) THEN |
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| 117 | zficeth(ji,jj) = zalbfz(ji,jj) |
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| 118 | ELSEIF( hicif(ji,jj) > 1.0 .AND. hicif(ji,jj) <= 1.5 ) THEN |
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| 119 | zficeth(ji,jj) = 0.472 + 2.0 * ( zalbfz(ji,jj) - 0.472 ) * ( hicif(ji,jj) - 1.0 ) |
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| 120 | ELSEIF( hicif(ji,jj) > 0.05 .AND. hicif(ji,jj) <= 1.0 ) THEN |
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| 121 | zficeth(ji,jj) = 0.2467 + 0.7049 * hicif(ji,jj) & |
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| 122 | & - 0.8608 * hicif(ji,jj) * hicif(ji,jj) & |
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| 123 | & + 0.3812 * hicif(ji,jj) * hicif(ji,jj) * hicif (ji,jj) |
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| 124 | ELSE |
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| 125 | zficeth(ji,jj) = 0.1 + 3.6 * hicif(ji,jj) |
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| 126 | ENDIF |
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| 127 | END DO |
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| 128 | END DO |
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| 129 | |
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| 130 | !----------------------------------------------- |
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| 131 | ! Computation of the snow/ice albedo system |
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| 132 | !-------------------------- --------------------- |
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| 133 | |
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| 134 | ! Albedo of snow-ice for clear sky. |
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| 135 | !----------------------------------------------- |
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| 136 | DO jj = 1, jpj |
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| 137 | DO ji = 1, jpi |
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| 138 | ! Case of ice covered by snow. |
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| 139 | |
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| 140 | ! melting snow |
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| 141 | zihsc1 = 1.0 - MAX ( zzero , SIGN ( zone , - ( hsnif(ji,jj) - c1 ) ) ) |
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| 142 | zalbpsnm = ( 1.0 - zihsc1 ) * ( zficeth(ji,jj) + hsnif(ji,jj) * ( alphd - zficeth(ji,jj) ) / c1 ) & |
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| 143 | & + zihsc1 * alphd |
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| 144 | ! freezing snow |
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| 145 | zihsc2 = MAX ( zzero , SIGN ( zone , hsnif(ji,jj) - c2 ) ) |
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| 146 | zalbpsnf = ( 1.0 - zihsc2 ) * ( albice + hsnif(ji,jj) * ( alphc - albice ) / c2 ) & |
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| 147 | & + zihsc2 * alphc |
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| 148 | |
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| 149 | zitmlsn = MAX ( zzero , SIGN ( zone , sist(ji,jj) - rt0_snow ) ) |
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| 150 | zalbpsn = zitmlsn * zalbpsnf + ( 1.0 - zitmlsn ) * zalbpsnm |
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| 151 | |
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| 152 | ! Case of ice free of snow. |
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| 153 | zalbpic = zficeth(ji,jj) |
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| 154 | |
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| 155 | ! albedo of the system |
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| 156 | zithsn = 1.0 - MAX ( zzero , SIGN ( zone , - hsnif(ji,jj) ) ) |
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| 157 | palbp(ji,jj) = zithsn * zalbpsn + ( 1.0 - zithsn ) * zalbpic |
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| 158 | END DO |
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| 159 | END DO |
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| 160 | |
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| 161 | ! Albedo of snow-ice for overcast sky. |
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| 162 | !---------------------------------------------- |
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| 163 | palb(:,:) = palbp(:,:) + cgren |
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| 164 | |
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| 165 | !-------------------------------------------- |
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| 166 | ! Computation of the albedo of the ocean |
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| 167 | !-------------------------- ----------------- |
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| 168 | |
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| 169 | ! Parameterization of Briegled and Ramanathan, 1982 |
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| 170 | zmue14 = zmue**1.4 |
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| 171 | palcnp(:,:) = 0.05 / ( 1.1 * zmue14 + 0.15 ) |
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| 172 | |
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| 173 | ! Parameterization of Kondratyev, 1969 and Payne, 1972 |
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| 174 | palcn(:,:) = 0.06 |
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| 175 | |
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| 176 | END SUBROUTINE flx_blk_albedo |
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| 177 | |
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| 178 | # else |
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| 179 | !!---------------------------------------------------------------------- |
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| 180 | !! Default option : NO sea-ice model |
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| 181 | !!---------------------------------------------------------------------- |
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| 182 | |
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| 183 | SUBROUTINE flx_blk_albedo( palb , palcn , palbp , palcnp ) |
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| 184 | !!---------------------------------------------------------------------- |
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| 185 | !! *** ROUTINE flx_blk_albedo *** |
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| 186 | !! |
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| 187 | !! ** Purpose : Computation of the albedo of the snow/ice system |
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| 188 | !! as well as the ocean one |
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| 189 | !! |
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| 190 | !! ** Method : Computation of the albedo of snow or ice (choose the |
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| 191 | !! wright one by a large number of tests Computation of the albedo |
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| 192 | !! of the ocean |
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| 193 | !! |
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| 194 | !! History : |
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| 195 | !! 8.0 ! 01-04 (LIM 1.0) |
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| 196 | !! 8.5 ! 03-07 (C. Ethe, G. Madec) Optimization (old name:shine) |
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| 197 | !!---------------------------------------------------------------------- |
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| 198 | !! * Arguments |
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| 199 | REAL(wp), DIMENSION(jpi,jpj), INTENT(out) :: & |
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| 200 | palb , & ! albedo of ice under overcast sky |
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| 201 | palcn , & ! albedo of ocean under overcast sky |
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| 202 | palbp , & ! albedo of ice under clear sky |
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| 203 | palcnp ! albedo of ocean under clear sky |
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| 204 | |
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| 205 | REAL(wp) :: & |
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| 206 | zmue14 ! zmue**1.4 |
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| 207 | !!---------------------------------------------------------------------- |
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| 208 | |
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| 209 | !-------------------------------------------- |
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| 210 | ! Computation of the albedo of the ocean |
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| 211 | !-------------------------- ----------------- |
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| 212 | |
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| 213 | ! Parameterization of Briegled and Ramanathan, 1982 |
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| 214 | zmue14 = zmue**1.4 |
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| 215 | palcnp(:,:) = 0.05 / ( 1.1 * zmue14 + 0.15 ) |
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| 216 | |
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| 217 | ! Parameterization of Kondratyev, 1969 and Payne, 1972 |
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| 218 | palcn(:,:) = 0.06 |
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| 219 | |
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| 220 | palb (:,:) = palcn(:,:) |
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| 221 | palbp(:,:) = palcnp(:,:) |
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| 222 | |
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| 223 | END SUBROUTINE flx_blk_albedo |
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| 224 | |
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| 225 | #endif |
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| 226 | !!====================================================================== |
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| 227 | END MODULE albedo |
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