| 1 | MODULE phytoplankton_mod |
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| 2 | !!====================================================================== |
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| 3 | !! *** MODULE phytoplankton_mod *** |
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| 4 | !! Calculates the phytoplankton growth |
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| 5 | !!====================================================================== |
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| 6 | !! History : |
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| 7 | !! - ! 2017-04 (M. Stringer) Code taken from trcbio_medusa.F90 |
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| 8 | !!---------------------------------------------------------------------- |
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| 9 | #if defined key_medusa |
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| 10 | !!---------------------------------------------------------------------- |
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| 11 | !! MEDUSA bio-model |
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| 12 | !!---------------------------------------------------------------------- |
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| 13 | |
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| 14 | IMPLICIT NONE |
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| 15 | PRIVATE |
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| 16 | |
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| 17 | PUBLIC phytoplankton ! Called in plankton.F90 |
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| 18 | |
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| 19 | !!---------------------------------------------------------------------- |
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| 20 | !! NEMO/TOP 2.0 , LOCEAN-IPSL (2007) |
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| 21 | !! $Id$ |
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| 22 | !! Software governed by the CeCILL licence (modipsl/doc/NEMO_CeCILL.txt) |
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| 23 | !!---------------------------------------------------------------------- |
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| 24 | |
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| 25 | CONTAINS |
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| 26 | |
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| 27 | SUBROUTINE phytoplankton( jk ) |
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| 28 | !!--------------------------------------------------------------------- |
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| 29 | !! *** ROUTINE phytoplankton *** |
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| 30 | !! This called from PLANKTON and calculates the phytoplankton |
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| 31 | !! growth. |
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| 32 | !!---------------------------------------------------------------------- |
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| 33 | USE bio_medusa_mod, ONLY: fald, faln, fchd, fchd1, fchn, fchn1, & |
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| 34 | fdep1, ffld, ffln2, fjld, fjln, & |
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| 35 | fjlim_pd, fjlim_pn, fjln, & |
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| 36 | fnld, fnln, fnsi, & |
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| 37 | fpdlim, fpnlim, fprd, fprd_ml, fprds, & |
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| 38 | fprn, fprn_ml, frd, frn, & |
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| 39 | fsin, fsld, fsld2, fthetad, fthetan, & |
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| 40 | ftot_det, ftot_dtc, ftot_pd, & |
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| 41 | ftot_pn, ftot_zme, ftot_zmi, & |
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| 42 | fun_Q10, fun_T, idf, idfval, & |
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| 43 | xvpdT, xvpnT, & |
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| 44 | zchd, zchn, zdet, zdin, zdtc, & |
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| 45 | zfer, zpds, zphd, zphn, zsil, & |
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| 46 | zzme, zzmi |
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| 47 | USE dom_oce, ONLY: e3t_0, e3t_n, gdepw_0, gdepw_n, tmask |
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| 48 | USE in_out_manager, ONLY: lwp, numout |
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| 49 | USE oce, ONLY: tsn |
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| 50 | USE par_kind, ONLY: wp |
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| 51 | USE par_oce, ONLY: jp_tem, jpim1, jpjm1 |
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| 52 | USE phycst, ONLY: rsmall |
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| 53 | USE sms_medusa, ONLY: jliebig, jphy, jq10, & |
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| 54 | xald, xaln, xfld, xfln, & |
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| 55 | xnld, xnln, xnsi0, xpar, & |
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| 56 | xsin0, xsld, xthetam, xthetamd, xuif, & |
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| 57 | xvpd, xvpn, xxi |
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| 58 | USE zdfmxl, ONLY: hmld |
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| 59 | |
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| 60 | !!* Substitution |
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| 61 | # include "domzgr_substitute.h90" |
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| 62 | |
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| 63 | !! Level |
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| 64 | INTEGER, INTENT( in ) :: jk |
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| 65 | |
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| 66 | INTEGER :: ji, jj |
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| 67 | |
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| 68 | REAL(wp) :: fsin1,fnsi1,fnsi2 |
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| 69 | REAL(wp) :: fq0 |
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| 70 | |
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| 71 | DO jj = 2,jpjm1 |
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| 72 | DO ji = 2,jpim1 |
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| 73 | !! OPEN wet point IF..THEN loop |
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| 74 | if (tmask(ji,jj,jk) == 1) then |
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| 75 | !!---------------------------------------------------------- |
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| 76 | !! Chlorophyll calculations |
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| 77 | !!---------------------------------------------------------- |
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| 78 | !! |
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| 79 | !! non-diatoms |
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| 80 | if (zphn(ji,jj).GT.rsmall) then |
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| 81 | fthetan(ji,jj) = max(tiny(zchn(ji,jj)), & |
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| 82 | (zchn(ji,jj) * xxi) / & |
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| 83 | (zphn(ji,jj) + tiny(zphn(ji,jj)))) |
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| 84 | faln(ji,jj) = xaln * fthetan(ji,jj) |
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| 85 | else |
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| 86 | fthetan(ji,jj) = 0. |
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| 87 | faln(ji,jj) = 0. |
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| 88 | endif |
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| 89 | !! |
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| 90 | !! diatoms |
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| 91 | if (zphd(ji,jj).GT.rsmall) then |
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| 92 | fthetad(ji,jj) = max(tiny(zchd(ji,jj)), & |
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| 93 | (zchd(ji,jj) * xxi) / & |
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| 94 | (zphd(ji,jj) + tiny(zphd(ji,jj)))) |
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| 95 | fald(ji,jj) = xald * fthetad(ji,jj) |
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| 96 | else |
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| 97 | fthetad(ji,jj) = 0. |
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| 98 | fald(ji,jj) = 0. |
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| 99 | endif |
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| 100 | |
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| 101 | # if defined key_debug_medusa |
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| 102 | !! report biological calculations |
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| 103 | if (idf.eq.1.AND.idfval.eq.1) then |
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| 104 | IF (lwp) write (numout,*) '------------------------------' |
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| 105 | IF (lwp) write (numout,*) 'faln(',jk,') = ', faln(ji,jj) |
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| 106 | IF (lwp) write (numout,*) 'fald(',jk,') = ', fald(ji,jj) |
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| 107 | endif |
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| 108 | # endif |
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| 109 | ENDIF |
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| 110 | ENDDO |
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| 111 | ENDDO |
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| 112 | |
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| 113 | DO jj = 2,jpjm1 |
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| 114 | DO ji = 2,jpim1 |
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| 115 | if (tmask(ji,jj,1) == 1) then |
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| 116 | !!---------------------------------------------------------- |
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| 117 | !! Phytoplankton light limitation |
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| 118 | !!---------------------------------------------------------- |
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| 119 | !! |
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| 120 | !! It is assumed xpar is the depth-averaged (vertical layer) PAR |
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| 121 | !! Light limitation (check self-shading) in W/m2 |
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| 122 | !! |
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| 123 | !! Note that there is no temperature dependence in phytoplankton |
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| 124 | !! growth rate or any other function. |
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| 125 | !! In calculation of Chl/Phy ratio tiny(phyto) is introduced to |
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| 126 | !! avoid NaNs in case of Phy==0. |
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| 127 | !! |
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| 128 | !! fthetad and fthetan are Chl:C ratio (gChl/gC) in diat and |
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| 129 | !! non-diat: |
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| 130 | !! for 1:1 Chl:P ratio (mgChl/mmolN) theta=0.012 |
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| 131 | !! |
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| 132 | !! AXY (16/07/09) |
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| 133 | !! temperature for new Eppley style phytoplankton growth |
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| 134 | fun_T(ji,jj) = 1.066**(1.0 * tsn(ji,jj,jk,jp_tem)) |
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| 135 | !! AXY (16/05/11): add in new Q10 (1.5, not 2.0) for |
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| 136 | !! phytoplankton growth; remin. unaffected |
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| 137 | fun_Q10(ji,jj) = jq10**((tsn(ji,jj,jk,jp_tem) - 0.0) / 10.0) |
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| 138 | if (jphy.eq.1) then |
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| 139 | xvpnT(ji,jj) = xvpn * fun_T(ji,jj) |
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| 140 | xvpdT(ji,jj) = xvpd * fun_T(ji,jj) |
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| 141 | elseif (jphy.eq.2) then |
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| 142 | xvpnT(ji,jj) = xvpn * fun_Q10(ji,jj) |
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| 143 | xvpdT(ji,jj) = xvpd * fun_Q10(ji,jj) |
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| 144 | else |
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| 145 | xvpnT(ji,jj) = xvpn |
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| 146 | xvpdT(ji,jj) = xvpd |
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| 147 | endif |
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| 148 | ENDIF |
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| 149 | ENDDO |
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| 150 | ENDDO |
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| 151 | |
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| 152 | DO jj = 2,jpjm1 |
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| 153 | DO ji = 2,jpim1 |
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| 154 | if (tmask(ji,jj,1) == 1) then |
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| 155 | !! |
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| 156 | !! non-diatoms |
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| 157 | fchn1(ji,jj) = (xvpnT(ji,jj) * xvpnT(ji,jj)) + & |
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| 158 | (faln(ji,jj) * faln(ji,jj) * & |
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| 159 | xpar(ji,jj,jk) * xpar(ji,jj,jk)) |
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| 160 | if (fchn1(ji,jj).GT.rsmall) then |
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| 161 | fchn(ji,jj) = xvpnT(ji,jj) / (sqrt(fchn1(ji,jj)) + & |
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| 162 | tiny(fchn1(ji,jj))) |
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| 163 | else |
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| 164 | fchn(ji,jj) = 0. |
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| 165 | endif |
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| 166 | !! non-diatom J term |
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| 167 | fjln(ji,jj) = fchn(ji,jj) * faln(ji,jj) * xpar(ji,jj,jk) |
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| 168 | fjlim_pn(ji,jj) = fjln(ji,jj) / xvpnT(ji,jj) |
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| 169 | ENDIF |
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| 170 | ENDDO |
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| 171 | ENDDO |
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| 172 | |
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| 173 | DO jj = 2,jpjm1 |
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| 174 | DO ji = 2,jpim1 |
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| 175 | if (tmask(ji,jj,1) == 1) then |
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| 176 | !! |
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| 177 | !! diatoms |
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| 178 | fchd1(ji,jj) = (xvpdT(ji,jj) * xvpdT(ji,jj)) + & |
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| 179 | (fald(ji,jj) * fald(ji,jj) * & |
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| 180 | xpar(ji,jj,jk) * xpar(ji,jj,jk)) |
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| 181 | if (fchd1(ji,jj).GT.rsmall) then |
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| 182 | fchd(ji,jj) = xvpdT(ji,jj) / (sqrt(fchd1(ji,jj)) + & |
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| 183 | tiny(fchd1(ji,jj))) |
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| 184 | else |
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| 185 | fchd(ji,jj) = 0. |
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| 186 | endif |
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| 187 | !! diatom J term |
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| 188 | fjld(ji,jj) = fchd(ji,jj) * fald(ji,jj) * xpar(ji,jj,jk) |
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| 189 | fjlim_pd(ji,jj) = fjld(ji,jj) / xvpdT(ji,jj) |
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| 190 | |
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| 191 | # if defined key_debug_medusa |
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| 192 | !! report phytoplankton light limitation |
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| 193 | if (idf.eq.1.AND.idfval.eq.1) then |
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| 194 | IF (lwp) write (numout,*) '------------------------------' |
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| 195 | IF (lwp) write (numout,*) 'fchn(',jk,') = ', fchn(ji,jj) |
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| 196 | IF (lwp) write (numout,*) 'fchd(',jk,') = ', fchd(ji,jj) |
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| 197 | IF (lwp) write (numout,*) 'fjln(',jk,') = ', fjln(ji,jj) |
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| 198 | IF (lwp) write (numout,*) 'fjld(',jk,') = ', fjld(ji,jj) |
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| 199 | endif |
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| 200 | # endif |
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| 201 | ENDIF |
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| 202 | ENDDO |
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| 203 | ENDDO |
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| 204 | |
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| 205 | DO jj = 2,jpjm1 |
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| 206 | DO ji = 2,jpim1 |
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| 207 | if (tmask(ji,jj,1) == 1) then |
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| 208 | !!---------------------------------------------------------- |
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| 209 | !! Phytoplankton nutrient limitation |
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| 210 | !!---------------------------------------------------------- |
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| 211 | !! |
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| 212 | !! non-diatoms (N, Fe). |
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| 213 | !! non-diatom Qn term |
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| 214 | fnln(ji,jj) = zdin(ji,jj) / (zdin(ji,jj) + xnln) |
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| 215 | !! non-diatom Qf term |
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| 216 | ffln2(ji,jj) = zfer(ji,jj) / (zfer(ji,jj) + xfln) |
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| 217 | !! |
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| 218 | !! diatoms (N, Si, Fe). |
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| 219 | !! diatom Qn term |
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| 220 | fnld(ji,jj) = zdin(ji,jj) / (zdin(ji,jj) + xnld) |
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| 221 | !! diatom Qs term |
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| 222 | fsld(ji,jj) = zsil(ji,jj) / (zsil(ji,jj) + xsld) |
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| 223 | !! diatom Qf term |
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| 224 | ffld(ji,jj) = zfer(ji,jj) / (zfer(ji,jj) + xfld) |
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| 225 | |
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| 226 | # if defined key_debug_medusa |
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| 227 | !! report phytoplankton nutrient limitation |
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| 228 | if (idf.eq.1.AND.idfval.eq.1) then |
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| 229 | IF (lwp) write (numout,*) '------------------------------' |
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| 230 | IF (lwp) write (numout,*) 'fnln(',jk,') = ', fnln(ji,jj) |
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| 231 | IF (lwp) write (numout,*) 'fnld(',jk,') = ', fnld(ji,jj) |
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| 232 | IF (lwp) write (numout,*) 'ffln2(',jk,') = ', ffln2(ji,jj) |
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| 233 | IF (lwp) write (numout,*) 'ffld(',jk,') = ', ffld(ji,jj) |
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| 234 | IF (lwp) write (numout,*) 'fsld(',jk,') = ', fsld(ji,jj) |
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| 235 | endif |
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| 236 | # endif |
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| 237 | ENDIF |
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| 238 | ENDDO |
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| 239 | ENDDO |
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| 240 | |
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| 241 | DO jj = 2,jpjm1 |
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| 242 | DO ji = 2,jpim1 |
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| 243 | if (tmask(ji,jj,1) == 1) then |
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| 244 | !!---------------------------------------------------------- |
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| 245 | !! Primary production (non-diatoms) |
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| 246 | !! (note: still needs multiplying by phytoplankton |
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| 247 | !! concentration) |
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| 248 | !!---------------------------------------------------------- |
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| 249 | !! |
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| 250 | if (jliebig .eq. 0) then |
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| 251 | !! multiplicative nutrient limitation |
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| 252 | fpnlim(ji,jj) = fnln(ji,jj) * ffln2(ji,jj) |
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| 253 | elseif (jliebig .eq. 1) then |
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| 254 | !! Liebig Law (= most limiting) nutrient limitation |
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| 255 | fpnlim(ji,jj) = min(fnln(ji,jj), ffln2(ji,jj)) |
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| 256 | endif |
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| 257 | fprn(ji,jj) = fjln(ji,jj) * fpnlim(ji,jj) |
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| 258 | ENDIF |
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| 259 | ENDDO |
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| 260 | ENDDO |
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| 261 | |
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| 262 | DO jj = 2,jpjm1 |
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| 263 | DO ji = 2,jpim1 |
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| 264 | if (tmask(ji,jj,1) == 1) then |
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| 265 | !!---------------------------------------------------------- |
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| 266 | !! Primary production (diatoms) |
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| 267 | !! (note: still needs multiplying by phytoplankton |
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| 268 | !! concentration) |
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| 269 | !! |
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| 270 | !! Production here is split between nitrogen production and |
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| 271 | !! that of silicon; depending upon the "intracellular" ratio |
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| 272 | !! of Si:N, model diatoms will uptake nitrogen/silicon |
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| 273 | !! differentially; this borrows from the diatom model of |
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| 274 | !! Mongin et al. (2006) |
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| 275 | !!---------------------------------------------------------- |
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| 276 | !! |
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| 277 | if (jliebig .eq. 0) then |
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| 278 | !! multiplicative nutrient limitation |
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| 279 | fpdlim(ji,jj) = fnld(ji,jj) * ffld(ji,jj) |
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| 280 | elseif (jliebig .eq. 1) then |
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| 281 | !! Liebig Law (= most limiting) nutrient limitation |
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| 282 | fpdlim(ji,jj) = min(fnld(ji,jj), ffld(ji,jj)) |
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| 283 | endif |
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| 284 | !! |
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| 285 | if (zphd(ji,jj).GT.rsmall .AND. zpds(ji,jj).GT.rsmall) then |
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| 286 | !! "intracellular" elemental ratios |
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| 287 | ! fsin(ji,jj) = zpds(ji,jj) / (zphd(ji,jj) + & |
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| 288 | ! tiny(zphd(ji,jj))) |
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| 289 | ! fnsi(ji,jj) = zphd(ji,jj) / (zpds(ji,jj) + & |
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| 290 | ! tiny(zpds(ji,jj))) |
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| 291 | fsin(ji,jj) = 0.0 |
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| 292 | IF( zphd(ji,jj) .GT. rsmall) fsin(ji,jj) = zpds(ji,jj) / & |
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| 293 | zphd(ji,jj) |
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| 294 | fnsi(ji,jj) = 0.0 |
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| 295 | IF( zpds(ji,jj) .GT. rsmall) fnsi(ji,jj) = zphd(ji,jj) / & |
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| 296 | zpds(ji,jj) |
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| 297 | !! AXY (23/02/10): these next variables derive from |
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| 298 | !! Mongin et al. (2003) |
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| 299 | fsin1 = 3.0 * xsin0 !! = 0.6 |
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| 300 | fnsi1 = 1.0 / fsin1 !! = 1.667 |
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| 301 | fnsi2 = 1.0 / xsin0 !! = 5.0 |
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| 302 | !! |
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| 303 | !! conditionalities based on ratios |
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| 304 | !! nitrogen (and iron and carbon) |
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| 305 | if (fsin(ji,jj).le.xsin0) then |
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| 306 | fprd(ji,jj) = 0.0 |
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| 307 | fsld2(ji,jj) = 0.0 |
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| 308 | elseif (fsin(ji,jj).lt.fsin1) then |
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| 309 | fprd(ji,jj) = xuif * ((fsin(ji,jj) - xsin0) / & |
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| 310 | (fsin(ji,jj) + & |
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| 311 | tiny(fsin(ji,jj)))) * & |
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| 312 | (fjld(ji,jj) * fpdlim(ji,jj)) |
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| 313 | fsld2(ji,jj) = xuif * ((fsin(ji,jj) - xsin0) / & |
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| 314 | (fsin(ji,jj) + & |
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| 315 | tiny(fsin(ji,jj)))) |
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| 316 | elseif (fsin(ji,jj).ge.fsin1) then |
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| 317 | fprd(ji,jj) = (fjld(ji,jj) * fpdlim(ji,jj)) |
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| 318 | fsld2(ji,jj) = 1.0 |
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| 319 | endif |
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| 320 | !! |
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| 321 | !! silicon |
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| 322 | if (fsin(ji,jj).lt.fnsi1) then |
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| 323 | fprds(ji,jj) = (fjld(ji,jj) * fsld(ji,jj)) |
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| 324 | elseif (fsin(ji,jj).lt.fnsi2) then |
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| 325 | fprds(ji,jj) = xuif * ((fnsi(ji,jj) - xnsi0) / & |
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| 326 | (fnsi(ji,jj) + & |
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| 327 | tiny(fnsi(ji,jj)))) * & |
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| 328 | (fjld(ji,jj) * fsld(ji,jj)) |
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| 329 | else |
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| 330 | fprds(ji,jj) = 0.0 |
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| 331 | endif |
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| 332 | else |
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| 333 | fsin(ji,jj) = 0.0 |
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| 334 | fnsi(ji,jj) = 0.0 |
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| 335 | fprd(ji,jj) = 0.0 |
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| 336 | fsld2(ji,jj) = 0.0 |
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| 337 | fprds(ji,jj) = 0.0 |
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| 338 | endif |
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| 339 | |
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| 340 | # if defined key_debug_medusa |
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| 341 | !! report phytoplankton growth (including diatom silicon |
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| 342 | !! submodel) |
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| 343 | if (idf.eq.1.AND.idfval.eq.1) then |
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| 344 | IF (lwp) write (numout,*) '------------------------------' |
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| 345 | IF (lwp) write (numout,*) 'fsin(',jk,') = ', fsin(ji,jj) |
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| 346 | IF (lwp) write (numout,*) 'fnsi(',jk,') = ', fnsi(ji,jj) |
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| 347 | IF (lwp) write (numout,*) 'fsld2(',jk,') = ', fsld2(ji,jj) |
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| 348 | IF (lwp) write (numout,*) 'fprn(',jk,') = ', fprn(ji,jj) |
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| 349 | IF (lwp) write (numout,*) 'fprd(',jk,') = ', fprd(ji,jj) |
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| 350 | IF (lwp) write (numout,*) 'fprds(',jk,') = ', fprds(ji,jj) |
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| 351 | endif |
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| 352 | # endif |
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| 353 | ENDIF |
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| 354 | ENDDO |
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| 355 | ENDDO |
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| 356 | |
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| 357 | DO jj = 2,jpjm1 |
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| 358 | DO ji = 2,jpim1 |
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| 359 | if (tmask(ji,jj,1) == 1) then |
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| 360 | !!---------------------------------------------------------- |
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| 361 | !! Mixed layer primary production |
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| 362 | !! this block calculates the amount of primary production |
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| 363 | !! that occurs within the upper mixed layer; this allows the |
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| 364 | !! separate diagnosis of "sub-surface" primary production; it |
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| 365 | !! does assume that short-term variability in mixed layer |
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| 366 | !! depth doesn't mess with things though |
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| 367 | !!---------------------------------------------------------- |
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| 368 | !! |
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| 369 | if (fdep1(ji,jj).le.hmld(ji,jj)) then |
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| 370 | !! this level is entirely in the mixed layer |
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| 371 | fq0 = 1.0 |
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| 372 | elseif (fsdepw(ji,jj,jk).ge.hmld(ji,jj)) then |
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| 373 | !! this level is entirely below the mixed layer |
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| 374 | fq0 = 0.0 |
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| 375 | else |
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| 376 | !! this level straddles the mixed layer |
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| 377 | fq0 = (hmld(ji,jj) - fsdepw(ji,jj,jk)) / fse3t(ji,jj,jk) |
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| 378 | endif |
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| 379 | !! |
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| 380 | fprn_ml(ji,jj) = fprn_ml(ji,jj) + (fprn(ji,jj) * zphn(ji,jj) * & |
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| 381 | fse3t(ji,jj,jk) * fq0) |
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| 382 | fprd_ml(ji,jj) = fprd_ml(ji,jj) + (fprd(ji,jj) * zphd(ji,jj) * & |
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| 383 | fse3t(ji,jj,jk) * fq0) |
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| 384 | ENDIF |
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| 385 | ENDDO |
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| 386 | ENDDO |
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| 387 | |
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| 388 | DO jj = 2,jpjm1 |
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| 389 | DO ji = 2,jpim1 |
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| 390 | if (tmask(ji,jj,1) == 1) then |
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| 391 | !!---------------------------------------------------------- |
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| 392 | !! Vertical Integral -- |
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| 393 | !!---------------------------------------------------------- |
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| 394 | !! vertical integral non-diatom phytoplankton |
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| 395 | ftot_pn(ji,jj) = ftot_pn(ji,jj) + (zphn(ji,jj) * & |
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| 396 | fse3t(ji,jj,jk)) |
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| 397 | !! vertical integral diatom phytoplankton |
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| 398 | ftot_pd(ji,jj) = ftot_pd(ji,jj) + (zphd(ji,jj) * & |
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| 399 | fse3t(ji,jj,jk)) |
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| 400 | !! vertical integral microzooplankton |
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| 401 | ftot_zmi(ji,jj) = ftot_zmi(ji,jj) + (zzmi(ji,jj) * & |
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| 402 | fse3t(ji,jj,jk)) |
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| 403 | !! vertical integral mesozooplankton |
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| 404 | ftot_zme(ji,jj) = ftot_zme(ji,jj) + (zzme(ji,jj) * & |
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| 405 | fse3t(ji,jj,jk)) |
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| 406 | !! vertical integral slow detritus, nitrogen |
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| 407 | ftot_det(ji,jj) = ftot_det(ji,jj) + (zdet(ji,jj) * & |
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| 408 | fse3t(ji,jj,jk)) |
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| 409 | !! vertical integral slow detritus, carbon |
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| 410 | ftot_dtc(ji,jj) = ftot_dtc(ji,jj) + (zdtc(ji,jj) * & |
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| 411 | fse3t(ji,jj,jk)) |
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| 412 | ENDIF |
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| 413 | ENDDO |
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| 414 | ENDDO |
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| 415 | |
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| 416 | DO jj = 2,jpjm1 |
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| 417 | DO ji = 2,jpim1 |
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| 418 | if (tmask(ji,jj,1) == 1) then |
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| 419 | !!---------------------------------------------------------- |
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| 420 | !! More chlorophyll calculations |
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| 421 | !!---------------------------------------------------------- |
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| 422 | !! |
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| 423 | !! frn(ji,jj) = (xthetam / fthetan(ji,jj)) * & |
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| 424 | !! (fprn(ji,jj) / (fthetan(ji,jj) * xpar(ji,jj,jk))) |
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| 425 | !! frd(ji,jj) = (xthetam / fthetad(ji,jj)) * & |
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| 426 | !! (fprd(ji,jj) / (fthetad(ji,jj) * xpar(ji,jj,jk))) |
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| 427 | frn(ji,jj) = (xthetam * fchn(ji,jj) * fnln(ji,jj) * & |
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| 428 | ffln2(ji,jj)) / (fthetan(ji,jj) + & |
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| 429 | tiny(fthetan(ji,jj))) |
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| 430 | !! AXY (12/05/09): there's potentially a problem here; fsld, |
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| 431 | !! silicic acid limitation, is used in the following line |
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| 432 | !! to regulate chlorophyll growth in a manner that is |
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| 433 | !! inconsistent with its use in the regulation of biomass |
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| 434 | !! growth; the Mongin term term used in growth is more |
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| 435 | !! complex than the simple multiplicative function used |
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| 436 | !! below |
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| 437 | !! frd(ji,jj) = (xthetam * fchd(ji,jj) * fnld(ji,jj) * & |
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| 438 | !! ffld(ji,jj) * fsld(ji,jj)) / & |
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| 439 | !! (fthetad(ji,jj) + tiny(fthetad(ji,jj))) |
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| 440 | !! AXY (12/05/09): this replacement line uses the new |
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| 441 | !! variable, fsld2, to regulate chlorophyll growth |
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| 442 | frd(ji,jj) = (xthetamd * fchd(ji,jj) * fnld(ji,jj) * & |
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| 443 | ffld(ji,jj) * fsld2(ji,jj)) / & |
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| 444 | (fthetad(ji,jj) + tiny(fthetad(ji,jj))) |
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| 445 | |
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| 446 | # if defined key_debug_medusa |
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| 447 | !! report chlorophyll calculations |
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| 448 | if (idf.eq.1.AND.idfval.eq.1) then |
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| 449 | IF (lwp) write (numout,*) '------------------------------' |
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| 450 | IF (lwp) write (numout,*) 'fthetan(',jk,') = ', fthetan(ji,jj) |
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| 451 | IF (lwp) write (numout,*) 'fthetad(',jk,') = ', fthetad(ji,jj) |
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| 452 | IF (lwp) write (numout,*) 'frn(',jk,') = ', frn(ji,jj) |
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| 453 | IF (lwp) write (numout,*) 'frd(',jk,') = ', frd(ji,jj) |
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| 454 | endif |
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| 455 | # endif |
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| 456 | |
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| 457 | ENDIF |
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| 458 | ENDDO |
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| 459 | ENDDO |
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| 460 | |
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| 461 | END SUBROUTINE phytoplankton |
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| 462 | |
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| 463 | #else |
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| 464 | !!====================================================================== |
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| 465 | !! Dummy module : No MEDUSA bio-model |
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| 466 | !!====================================================================== |
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| 467 | CONTAINS |
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| 468 | SUBROUTINE phytoplankton( ) ! Empty routine |
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| 469 | WRITE(*,*) 'phytoplankton: You should not have seen this print! error?' |
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| 470 | END SUBROUTINE phytoplankton |
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| 471 | #endif |
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| 472 | |
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| 473 | !!====================================================================== |
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| 474 | END MODULE phytoplankton_mod |
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