| 1 | !$gpum horizontal klon |
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| 2 | MODULE lmdz_reevap |
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| 3 | |
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| 4 | CONTAINS |
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| 5 | |
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| 6 | SUBROUTINE reevap(klon, klev, temp, qv, ql, qi, & |
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| 7 | & d_temp_eva, d_qv_eva, d_ql_eva, d_qi_eva) |
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| 8 | |
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| 9 | !============================================================================= |
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| 10 | ! This routine evaporates (and sublimates) the condensed water at the |
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| 11 | ! beginning of the physics in order to work with the total water |
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| 12 | ! specific content of water which is a conserved variable |
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| 13 | ! (one of the so-called Bett's variable) |
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| 14 | ! |
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| 15 | ! reference: Madeleine et al. 2020, doi:10.1029/2020MS002046 |
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| 16 | ! contact: C. Rio, catherine.rio@meteo.fr |
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| 17 | !============================================================================= |
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| 18 | |
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| 19 | USE lmdz_reevap_ini, only: fl_cor_ebil, iflag_ice_thermo |
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| 20 | USE lmdz_reevap_ini, only: RLVTT, RLSTT, RCPD, RVTMP2 |
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| 21 | |
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| 22 | IMPLICIT none |
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| 23 | |
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| 24 | !====================================================================== |
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| 25 | ! Declarations |
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| 26 | !====================================================================== |
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| 27 | |
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| 28 | ! Input variables: |
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| 29 | !----------------- |
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| 30 | INTEGER, INTENT(IN) :: klon, klev ! horizontal and vertical dimensions |
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| 31 | REAL, DIMENSION(klon, klev), INTENT(IN) :: temp ! temperature [K] |
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| 32 | REAL, DIMENSION(klon, klev), INTENT(IN) :: qv ! specific humidity (vapor) [kg/kg] |
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| 33 | REAL, DIMENSION(klon, klev), INTENT(IN) :: ql ! specific liquid water [kg/kg] |
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| 34 | REAL, DIMENSION(klon, klev), INTENT(IN) :: qi ! specific ice water [kg/kg] |
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| 35 | |
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| 36 | ! Output variables: |
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| 37 | !----------------- |
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| 38 | REAL, DIMENSION(klon, klev), INTENT(OUT) :: d_temp_eva ! temperature increment due to evap. [K] |
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| 39 | REAL, DIMENSION(klon, klev), INTENT(OUT) :: d_qv_eva ! specific humidity increment due to evap [kg/kg] |
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| 40 | REAL, DIMENSION(klon, klev), INTENT(OUT) :: d_ql_eva ! specific liquid water increment due to evap [kg/kg] |
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| 41 | REAL, DIMENSION(klon, klev), INTENT(OUT) :: d_qi_eva ! specific ice water increment due to evap [kg/kg] |
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| 42 | |
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| 43 | ! Local variables |
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| 44 | !----------------- |
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| 45 | INTEGER :: i, k |
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| 46 | REAL :: za, zb, zlvdcp, zlsdcp, zdelta |
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| 47 | |
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| 48 | !====================================================================== |
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| 49 | ! Computation of evaporation and sublimation |
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| 50 | !====================================================================== |
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| 51 | |
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| 52 | DO k = 1, klev |
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| 53 | DO i = 1, klon |
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| 54 | IF (fl_cor_ebil .GT. 0) THEN |
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| 55 | ! the mass of condensates is taken into account when applying enthalpy conservation |
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| 56 | ! (first principle of thermodynamics) |
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| 57 | zlvdcp = RLVTT/RCPD/(1.0 + RVTMP2*(qv(i, k) + ql(i, k) + qi(i, k))) |
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| 58 | zlsdcp = RLSTT/RCPD/(1.0 + RVTMP2*(qv(i, k) + ql(i, k) + qi(i, k))) |
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| 59 | ELSE |
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| 60 | zlvdcp = RLVTT/RCPD/(1.0 + RVTMP2*qv(i, k)) |
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| 61 | zlsdcp = RLSTT/RCPD/(1.0 + RVTMP2*qv(i, k)) |
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| 62 | END IF |
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| 63 | |
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| 64 | IF (iflag_ice_thermo .EQ. 0) THEN |
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| 65 | ! if iflag_ice_thermo = 0, only the liquid phase is considered thermodynamically |
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| 66 | ! active in LMDZ, no only liquid water is evaporated |
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| 67 | zlsdcp=zlvdcp |
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| 68 | zdelta = 0.0 |
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| 69 | zb = MAX(0.0, ql(i, k)) |
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| 70 | za = - MAX(0.0 , ql(i,k)) & |
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| 71 | * (zlvdcp*(1.-zdelta)+zlsdcp*zdelta) |
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| 72 | d_temp_eva(i, k) = za |
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| 73 | d_qv_eva(i, k) = zb |
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| 74 | d_ql_eva(i, k) = -ql(i, k) |
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| 75 | d_qi_eva(i, k) = 0. |
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| 76 | |
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| 77 | ELSE |
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| 78 | ! both liquid and ice are evaporated / sublimated |
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| 79 | zb = MAX(0.0, ql(i, k) + qi(i, k)) |
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| 80 | za = -MAX(0.0, ql(i, k))*zlvdcp & |
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| 81 | - MAX(0.0, qi(i, k))*zlsdcp |
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| 82 | d_temp_eva(i, k) = za |
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| 83 | d_qv_eva(i, k) = zb |
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| 84 | d_ql_eva(i, k) = -ql(i, k) |
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| 85 | d_qi_eva(i, k) = -qi(i, k) |
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| 86 | END IF |
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| 87 | |
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| 88 | END DO |
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| 89 | END DO |
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| 90 | |
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| 91 | RETURN |
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| 92 | |
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| 93 | END SUBROUTINE reevap |
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| 94 | |
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| 95 | END MODULE lmdz_reevap |
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