| 1 | MODULE p4znano |
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| 2 | !!====================================================================== |
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| 3 | !! *** MODULE p4znano *** |
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| 4 | !! TOP : PISCES Compute the mortality terms for nanophytoplankton |
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| 5 | !!====================================================================== |
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| 6 | !! History : 1.0 ! 2002 (O. Aumont) Original code |
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| 7 | !! 2.0 ! 2007-12 (C. Ethe, G. Madec) F90 |
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| 8 | !!---------------------------------------------------------------------- |
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| 9 | #if defined key_pisces |
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| 10 | !!---------------------------------------------------------------------- |
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| 11 | !! 'key_pisces' PISCES bio-model |
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| 12 | !!---------------------------------------------------------------------- |
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| 13 | !! p4z_nano : Compute the mortality terms for nanophytoplankton |
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| 14 | !!---------------------------------------------------------------------- |
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| 15 | USE oce_trc ! |
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| 16 | USE trp_trc ! |
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| 17 | USE sms ! |
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| 18 | |
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| 19 | IMPLICIT NONE |
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| 20 | PRIVATE |
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| 21 | |
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| 22 | PUBLIC p4z_nano ! called in p4zbio.F90 |
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| 23 | |
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| 24 | !!* Substitution |
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| 25 | # include "domzgr_substitute.h90" |
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| 26 | !!---------------------------------------------------------------------- |
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| 27 | !! NEMO/TOP 2.0 , LOCEAN-IPSL (2007) |
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| 28 | !! $Header:$ |
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| 29 | !! Software governed by the CeCILL licence (modipsl/doc/NEMO_CeCILL.txt) |
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| 30 | !!---------------------------------------------------------------------- |
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| 31 | |
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| 32 | CONTAINS |
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| 33 | |
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| 34 | SUBROUTINE p4z_nano |
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| 35 | !!--------------------------------------------------------------------- |
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| 36 | !! *** ROUTINE p4z_nano *** |
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| 37 | !! |
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| 38 | !! ** Purpose : Compute the mortality terms for nanophytoplankton |
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| 39 | !! |
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| 40 | !! ** Method : - ??? |
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| 41 | !!--------------------------------------------------------------------- |
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| 42 | INTEGER :: ji, jj, jk |
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| 43 | REAL(wp) :: zfact, zstep, zcompaph |
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| 44 | !!--------------------------------------------------------------------- |
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| 45 | |
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| 46 | |
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| 47 | zstep = rfact2 / rjjss ! Time step duration for biology |
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| 48 | |
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| 49 | |
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| 50 | DO jk = 1, jpkm1 |
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| 51 | DO jj = 1, jpj |
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| 52 | DO ji = 1, jpi |
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| 53 | |
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| 54 | zcompaph = MAX( ( trn(ji,jj,jk,jpphy) - 1e-8 ), 0.e0 ) |
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| 55 | zfact = 1./ ( trn(ji,jj,jk,jpphy) + rtrn ) |
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| 56 | |
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| 57 | ! Squared mortality of Phyto similar to a sedimentation term during |
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| 58 | ! blooms (Doney et al. 1996) |
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| 59 | ! ----------------------------------------------------------------- |
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| 60 | respp(ji,jj,jk) = wchl * 1.e6 * zstep * zdiss(ji,jj,jk) & |
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| 61 | # if defined key_off_degrad |
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| 62 | & * facvol(ji,jj,jk) & |
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| 63 | # endif |
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| 64 | & * zcompaph * trn(ji,jj,jk,jpphy) |
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| 65 | |
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| 66 | respnf (ji,jj,jk) = respp(ji,jj,jk) * trn(ji,jj,jk,jpnfe) * zfact |
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| 67 | |
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| 68 | respnch(ji,jj,jk) = respp(ji,jj,jk) * trn(ji,jj,jk,jpnch) * zfact |
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| 69 | |
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| 70 | ! Phytoplankton mortality. This mortality loss is slightly |
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| 71 | ! increased when nutrients are limiting phytoplankton growth |
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| 72 | ! as observed for instance in case of iron limitation. |
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| 73 | ! ---------------------------------------------------------- |
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| 74 | tortp (ji,jj,jk) = mprat * zstep * trn(ji,jj,jk,jpphy) & |
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| 75 | # if defined key_off_degrad |
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| 76 | & * facvol(ji,jj,jk) & |
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| 77 | # endif |
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| 78 | & / ( xkmort + trn(ji,jj,jk,jpphy) ) * zcompaph |
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| 79 | |
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| 80 | tortnf (ji,jj,jk) = tortp(ji,jj,jk) * trn(ji,jj,jk,jpnfe) * zfact |
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| 81 | |
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| 82 | tortnch(ji,jj,jk) = tortp(ji,jj,jk) * trn(ji,jj,jk,jpnch) * zfact |
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| 83 | |
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| 84 | END DO |
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| 85 | END DO |
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| 86 | END DO |
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| 87 | ! |
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| 88 | END SUBROUTINE p4z_nano |
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| 89 | |
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| 90 | #else |
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| 91 | !!====================================================================== |
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| 92 | !! Dummy module : No PISCES bio-model |
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| 93 | !!====================================================================== |
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| 94 | CONTAINS |
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| 95 | SUBROUTINE p4z_nano ! Empty routine |
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| 96 | END SUBROUTINE p4z_nano |
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| 97 | #endif |
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| 98 | |
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| 99 | !!====================================================================== |
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| 100 | END MODULE p4znano |
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