| 1 | MODULE ocfzpt |
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| 2 | !!====================================================================== |
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| 3 | !! *** MODULE ocfzpt *** |
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| 4 | !! Ocean active tracers: freezing point computation and freezing area |
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| 5 | !!====================================================================== |
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| 6 | |
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| 7 | !!---------------------------------------------------------------------- |
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| 8 | !! * Modules used |
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| 9 | USE oce ! ocean dynamics and tracers |
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| 10 | USE dom_oce ! ocean space and time domain |
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| 11 | |
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| 12 | IMPLICIT NONE |
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| 13 | PRIVATE |
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| 14 | |
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| 15 | !! * Routine accessibility |
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| 16 | PUBLIC oc_fz_pt ! called by opa.F90 and step.F90 |
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| 17 | |
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| 18 | !! * Shared module variables |
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| 19 | REAL(wp), PUBLIC, DIMENSION(jpi,jpj) :: & !: |
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| 20 | freeze, freezn, & !: after and now ice mask (0 or 1) |
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| 21 | fzptb, fzptn !: before and now freezing point |
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| 22 | !!---------------------------------------------------------------------- |
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| 23 | !! OPA 8.5, LODYC-IPSL (2002) |
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| 24 | !!---------------------------------------------------------------------- |
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| 25 | |
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| 26 | CONTAINS |
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| 27 | |
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| 28 | SUBROUTINE oc_fz_pt |
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| 29 | !!---------------------------------------------------------------------- |
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| 30 | !! *** ROUTINE oc_fz_pt *** |
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| 31 | !! |
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| 32 | !! ** Purpose : - Calculate ocean surface freezing temperature |
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| 33 | !! - Calculate related boolean for now ice distribution |
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| 34 | !! |
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| 35 | !! ** Method : Caution, freezing point only for jackett & McDougall eos |
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| 36 | !! |
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| 37 | !! ** Action : - fzptn : now freezing temperature at ocean surface |
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| 38 | !! - fzptb : before freezing temperature at ocean surface |
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| 39 | !! - freezn : boolean indicating freezing conditions at the |
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| 40 | !! ocean surface at time step "now" |
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| 41 | !! |
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| 42 | !! History : |
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| 43 | !! ! 94-08 (M.-A. Filiberti) Original code |
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| 44 | !! 8.5 ! 02-08 (G. Madec) F90: Free form |
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| 45 | !!---------------------------------------------------------------------- |
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| 46 | !! * Local declarations |
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| 47 | INTEGER :: ji, jj ! dummy loop indices |
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| 48 | !!---------------------------------------------------------------------- |
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| 49 | |
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| 50 | !CDIR NOVERRCHK |
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| 51 | DO jj = 1, jpj |
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| 52 | !CDIR NOVERRCHK |
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| 53 | DO ji = 1, jpi |
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| 54 | fzptb(ji,jj) = fzptn(ji,jj) ! swap freezing point array |
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| 55 | |
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| 56 | ! ! ocean local surface freezing temperature |
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| 57 | ! ! sn >= 0 : this is verified in stpctl at each time step |
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| 58 | fzptn (ji,jj) = ( -0.0575 + 1.710523e-3 * SQRT( sn(ji,jj,1) ) & |
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| 59 | - 2.154996e-4 * sn(ji,jj,1) ) * sn(ji,jj,1) !! & |
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| 60 | !! - 7.53e-4 * pressure |
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| 61 | |
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| 62 | ! ! Define boolean related to freezing conditions |
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| 63 | freezn(ji,jj) = tmask(ji,jj,1) * MAX( 0., SIGN( 1., fzptn(ji,jj) - tn(ji,jj,1) ) ) |
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| 64 | END DO |
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| 65 | END DO |
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| 66 | |
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| 67 | END SUBROUTINE oc_fz_pt |
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| 68 | |
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| 69 | !!====================================================================== |
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| 70 | END MODULE ocfzpt |
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