1 | MODULE p4zdiat |
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2 | !!====================================================================== |
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3 | !! *** MODULE p4zdiat *** |
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4 | !! TOP : PISCES Compute the mortality terms for diatoms |
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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_diat : Compute the mortality terms for diatoms |
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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_diat ! 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_diat |
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35 | !!--------------------------------------------------------------------- |
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36 | !! *** ROUTINE p4z_diat *** |
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37 | !! |
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38 | !! ** Purpose : Compute the mortality terms for diatoms |
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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, zcompadi |
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44 | !!--------------------------------------------------------------------- |
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45 | |
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46 | zstep = rfact2 / rjjss ! Time step duration for biology |
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47 | |
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48 | |
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49 | ! Aggregation term for diatoms is increased in case of nutrient |
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50 | ! stress as observed in reality. The stressed cells become more |
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51 | ! sticky and coagulate to sink quickly out of the euphotic zone |
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52 | ! ------------------------------------------------------------ |
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53 | |
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54 | DO jk = 1, jpkm1 |
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55 | DO jj = 1, jpj |
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56 | DO ji = 1, jpi |
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57 | |
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58 | zcompadi = MAX( ( trn(ji,jj,jk,jpdia) - 1e-8), 0. ) |
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59 | zfact = 1. / ( trn(ji,jj,jk,jpdia) + rtrn ) |
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60 | |
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61 | ! Aggregation term for diatoms is increased in case of nutrient |
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62 | ! stress as observed in reality. The stressed cells become more |
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63 | ! sticky and coagulate to sink quickly out of the euphotic zone |
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64 | ! ------------------------------------------------------------ |
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65 | |
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66 | respp2 (ji,jj,jk) = 1.e6 * zstep * ( wchl + wchld * ( 1.- xlimdia(ji,jj,jk) ) ) & |
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67 | # if defined key_off_degrad |
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68 | & * facvol(ji,jj,jk) & |
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69 | # endif |
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70 | & * zdiss(ji,jj,jk) * zcompadi * trn(ji,jj,jk,jpdia) |
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71 | |
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72 | respds (ji,jj,jk) = respp2(ji,jj,jk) * trn(ji,jj,jk,jpbsi) * zfact |
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73 | |
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74 | respdf (ji,jj,jk) = respp2(ji,jj,jk) * trn(ji,jj,jk,jpdfe) * zfact |
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75 | |
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76 | respdch(ji,jj,jk) = respp2(ji,jj,jk) * trn(ji,jj,jk,jpdch) * zfact |
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77 | |
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78 | ! Phytoplankton mortality. |
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79 | ! ------------------------ |
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80 | tortp2 (ji,jj,jk) = mprat2 * zstep * trn(ji,jj,jk,jpdia) & |
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81 | # if defined key_off_degrad |
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82 | & * facvol(ji,jj,jk) & |
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83 | # endif |
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84 | & / ( xkmort + trn(ji,jj,jk,jpdia) ) * zcompadi |
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85 | |
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86 | tortds (ji,jj,jk) = tortp2(ji,jj,jk) * trn(ji,jj,jk,jpbsi) * zfact |
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87 | |
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88 | tortdf (ji,jj,jk) = tortp2(ji,jj,jk) * trn(ji,jj,jk,jpdfe) * zfact |
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89 | |
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90 | tortdch(ji,jj,jk) = tortp2(ji,jj,jk) * trn(ji,jj,jk,jpdch) * zfact |
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91 | |
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92 | END DO |
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93 | END DO |
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94 | END DO |
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95 | ! |
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96 | END SUBROUTINE p4z_diat |
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97 | |
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98 | #else |
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99 | !!====================================================================== |
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100 | !! Dummy module : No PISCES bio-model |
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101 | !!====================================================================== |
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102 | CONTAINS |
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103 | SUBROUTINE p4z_diat ! Empty routine |
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104 | END SUBROUTINE p4z_diat |
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105 | #endif |
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106 | |
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107 | !!====================================================================== |
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108 | END MODULE p4zdiat |
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