1 | MODULE isfhdiv |
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2 | !!====================================================================== |
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3 | !! *** MODULE isfhdiv *** |
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4 | !! ice shelf horizontal divergence module : update the horizontal divergence |
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5 | !! with the ice shelf melt and coupling correction |
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6 | !!====================================================================== |
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7 | !! History : 4.0 ! 2019-09 (P. Mathiot) Original code |
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8 | !!---------------------------------------------------------------------- |
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9 | |
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10 | !!---------------------------------------------------------------------- |
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11 | !! isf_hdiv : update the horizontal divergence with the ice shelf |
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12 | !! melt and coupling correction |
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13 | !!---------------------------------------------------------------------- |
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14 | |
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15 | USE isf_oce ! ice shelf |
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16 | |
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17 | USE dom_oce ! time and space domain |
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18 | USE phycst , ONLY: r1_rau0 ! physical constant |
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19 | USE in_out_manager ! |
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20 | |
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21 | IMPLICIT NONE |
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22 | |
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23 | PRIVATE |
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24 | |
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25 | PUBLIC isf_hdiv |
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26 | |
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27 | CONTAINS |
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28 | |
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29 | SUBROUTINE isf_hdiv( kt, Kmm, phdiv ) |
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30 | !!---------------------------------------------------------------------- |
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31 | !! *** SUBROUTINE isf_hdiv *** |
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32 | !! |
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33 | !! ** Purpose : update the horizontal divergence with the ice shelf contribution |
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34 | !! (parametrisation, explicit, ice sheet coupling conservation |
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35 | !! increment) |
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36 | !! |
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37 | !!---------------------------------------------------------------------- |
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38 | REAL(wp), DIMENSION(:,:,:), INTENT( inout ) :: phdiv ! horizontal divergence |
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39 | !!---------------------------------------------------------------------- |
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40 | INTEGER, INTENT(in) :: kt |
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41 | INTEGER, INTENT(in) :: Kmm ! ocean time level index |
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42 | ! |
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43 | IF ( ln_isf ) THEN |
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44 | ! |
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45 | ! ice shelf cavity contribution |
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46 | IF ( ln_isfcav_mlt ) CALL isf_hdiv_mlt(misfkt_cav, misfkb_cav, rhisf_tbl_cav, rfrac_tbl_cav, fwfisf_cav, fwfisf_cav_b, phdiv) |
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47 | ! |
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48 | ! ice shelf parametrisation contribution |
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49 | IF ( ln_isfpar_mlt ) CALL isf_hdiv_mlt(misfkt_par, misfkb_par, rhisf_tbl_par, rfrac_tbl_par, fwfisf_par, fwfisf_par_b, phdiv) |
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50 | ! |
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51 | ! ice sheet coupling contribution |
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52 | IF ( ln_isfcpl .AND. kt /= 0 ) THEN |
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53 | ! |
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54 | ! Dynamical stability at start up after change in under ice shelf cavity geometry is achieve by correcting the divergence. |
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55 | ! This is achieved by applying a volume flux in order to keep the horizontal divergence after remapping |
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56 | ! the same as at the end of the latest time step. So correction need to be apply at nit000 (euler time step) and |
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57 | ! half of it at nit000+1 (leap frog time step). |
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58 | IF ( kt == nit000 ) CALL isf_hdiv_cpl(Kmm, risfcpl_vol , phdiv) |
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59 | IF ( kt == nit000+1 ) CALL isf_hdiv_cpl(Kmm, risfcpl_vol*0.5_wp, phdiv) |
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60 | ! |
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61 | ! correct divergence every time step to remove any trend due to coupling |
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62 | ! conservation option |
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63 | IF ( ln_isfcpl_cons ) CALL isf_hdiv_cpl(Kmm, risfcpl_cons_vol, phdiv) |
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64 | ! |
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65 | END IF |
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66 | ! |
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67 | END IF |
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68 | ! |
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69 | END SUBROUTINE isf_hdiv |
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70 | |
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71 | SUBROUTINE isf_hdiv_mlt(ktop, kbot, phtbl, pfrac, pfwf, pfwf_b, phdiv) |
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72 | !!---------------------------------------------------------------------- |
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73 | !! *** SUBROUTINE sbc_isf_div *** |
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74 | !! |
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75 | !! ** Purpose : update the horizontal divergence with the ice shelf inflow |
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76 | !! |
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77 | !! ** Method : pfwf is positive (outflow) and expressed as kg/m2/s |
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78 | !! increase the divergence |
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79 | !! |
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80 | !! ** Action : phdivn increased by the ice shelf outflow |
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81 | !!---------------------------------------------------------------------- |
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82 | REAL(wp), DIMENSION(jpi,jpj,jpk), INTENT(inout) :: phdiv |
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83 | !!---------------------------------------------------------------------- |
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84 | INTEGER , DIMENSION(jpi,jpj), INTENT(in ) :: ktop , kbot |
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85 | REAL(wp), DIMENSION(jpi,jpj), INTENT(in ) :: pfrac, phtbl |
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86 | REAL(wp), DIMENSION(jpi,jpj), INTENT(in ) :: pfwf , pfwf_b |
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87 | !!---------------------------------------------------------------------- |
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88 | INTEGER :: ji, jj, jk ! dummy loop indices |
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89 | INTEGER :: ikt, ikb |
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90 | REAL(wp), DIMENSION(jpi,jpj) :: zhdiv |
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91 | !!---------------------------------------------------------------------- |
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92 | ! |
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93 | !== fwf distributed over several levels ==! |
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94 | ! |
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95 | ! compute integrated divergence correction |
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96 | zhdiv(:,:) = 0.5_wp * ( pfwf(:,:) + pfwf_b(:,:) ) * r1_rau0 / phtbl(:,:) |
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97 | ! |
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98 | ! update divergence at each level affected by ice shelf top boundary layer |
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99 | DO jj = 1,jpj |
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100 | DO ji = 1,jpi |
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101 | ikt = ktop(ji,jj) |
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102 | ikb = kbot(ji,jj) |
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103 | ! level fully include in the ice shelf boundary layer |
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104 | DO jk = ikt, ikb - 1 |
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105 | phdiv(ji,jj,jk) = phdiv(ji,jj,jk) + zhdiv(ji,jj) |
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106 | END DO |
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107 | ! level partially include in ice shelf boundary layer |
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108 | phdiv(ji,jj,ikb) = phdiv(ji,jj,ikb) + zhdiv(ji,jj) * pfrac(ji,jj) |
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109 | END DO |
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110 | END DO |
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111 | ! |
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112 | END SUBROUTINE isf_hdiv_mlt |
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113 | |
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114 | SUBROUTINE isf_hdiv_cpl(Kmm, pqvol, phdiv) |
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115 | !!---------------------------------------------------------------------- |
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116 | !! *** SUBROUTINE isf_hdiv_cpl *** |
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117 | !! |
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118 | !! ** Purpose : update the horizontal divergence with the ice shelf |
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119 | !! coupling conservation increment |
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120 | !! |
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121 | !! ** Method : pqvol is positive (outflow) and expressed as m3/s |
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122 | !! increase the divergence |
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123 | !! |
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124 | !! ** Action : phdivn increased by the ice shelf outflow |
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125 | !! |
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126 | !!---------------------------------------------------------------------- |
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127 | REAL(wp), DIMENSION(jpi,jpj,jpk), INTENT(inout) :: phdiv |
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128 | !!---------------------------------------------------------------------- |
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129 | INTEGER, INTENT(in) :: Kmm ! ocean time level index |
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130 | REAL(wp), DIMENSION(jpi,jpj,jpk), INTENT(in ) :: pqvol |
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131 | !!---------------------------------------------------------------------- |
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132 | INTEGER :: jk |
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133 | !!---------------------------------------------------------------------- |
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134 | ! |
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135 | DO jk=1,jpk |
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136 | phdiv(:,:,jk) = phdiv(:,:,jk) + pqvol(:,:,jk) * r1_e1e2t(:,:) / e3t(:,:,jk,Kmm) |
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137 | END DO |
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138 | ! |
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139 | END SUBROUTINE isf_hdiv_cpl |
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140 | |
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141 | END MODULE isfhdiv |
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