[5726] | 1 | MODULE trcdms_medusa |
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| 2 | !!====================================================================== |
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| 3 | !! *** MODULE trcdms_medusa *** |
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| 4 | !! TOP : MEDUSA |
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| 5 | !!====================================================================== |
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| 6 | !! History : |
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| 7 | !! - ! 2014-08 (J. Palmiéri - A. Yool) added for UKESM1 project |
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| 8 | !!---------------------------------------------------------------------- |
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| 9 | #if defined key_medusa && defined key_roam |
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| 10 | !!---------------------------------------------------------------------- |
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| 11 | !! MEDUSA DMS surface concentration |
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| 12 | !!---------------------------------------------------------------------- |
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| 13 | !! trc_dms_medusa : |
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| 14 | !!---------------------------------------------------------------------- |
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| 15 | USE oce_trc |
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| 16 | USE trc |
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| 17 | USE sms_medusa |
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| 18 | USE lbclnk |
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| 19 | USE prtctl_trc ! Print control for debugging |
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| 20 | USE in_out_manager ! I/O manager |
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| 21 | |
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| 22 | IMPLICIT NONE |
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| 23 | PRIVATE |
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| 24 | |
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| 25 | PUBLIC trc_dms_medusa ! called in trc_bio_medusa |
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| 26 | |
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| 27 | !!* Substitution |
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| 28 | # include "domzgr_substitute.h90" |
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| 29 | !!---------------------------------------------------------------------- |
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| 30 | !! NEMO/TOP 2.0 , LOCEAN-IPSL (2007) |
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| 31 | !! $Id$ |
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| 32 | !! Software governed by the CeCILL licence (modipsl/doc/NEMO_CeCILL.txt) |
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| 33 | !!---------------------------------------------------------------------- |
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| 34 | |
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| 35 | |
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| 36 | CONTAINS |
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| 37 | |
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| 38 | !======================================================================= |
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| 39 | ! |
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| 40 | SUBROUTINE trc_dms_medusa( chn, chd, mld, xqsr, xdin, & !! inputs |
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| 41 | & dms_surf, dms_andr, dms_simo, dms_aran, dms_hall ) !! outputs |
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| 42 | ! |
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| 43 | !======================================================================= |
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| 44 | !! |
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| 45 | !! Title : Calculates DMS ocean surface concentration |
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| 46 | !! Author : Julien Palmiéri and Andrew Yool |
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| 47 | !! Date : 08/08/14 |
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| 48 | !! |
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| 49 | !! DMS module is called in trc_bio's huge jk,jj,ji loop |
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| 50 | !! --> DMS concentration is calculated in a specific cell |
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| 51 | !! (no need of ji,jj,jk) |
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| 52 | !! |
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| 53 | !! AXY (13/03/15): amend to include all four schemes tested |
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| 54 | !! during winter/spring 2015; these are: |
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| 55 | !! |
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| 56 | !! 1. Anderson et al. (2001); this uses fields |
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| 57 | !! of surface chl, irradiance and nutrients |
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| 58 | !! to empirically estimate DMS via a broken |
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| 59 | !! stick approach |
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| 60 | !! |
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| 61 | !! 2. Simo & Dachs (2002); this uses fields of |
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| 62 | !! surface chl and mixed layer depth |
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| 63 | !! |
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| 64 | !! 3. Aranami & Tsunogai (2004); this is an |
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| 65 | !! embellishment of Simo & Dachs |
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| 66 | !! |
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| 67 | !! 4. Halloran et al. (2010); this is an |
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| 68 | !! alternative embellishment of Sim & Dachs |
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| 69 | !! and is included because it is formally |
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| 70 | !! published (and different from the above) |
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| 71 | !! |
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| 72 | !======================================================================= |
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| 73 | |
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| 74 | IMPLICIT NONE |
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| 75 | ! |
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| 76 | REAL(wp), INTENT( in ) :: chn !! non-diatom chlorophyll (mg/m3) |
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| 77 | REAL(wp), INTENT( in ) :: chd !! diatom chlorophyll (mg/m3) |
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| 78 | REAL(wp), INTENT( in ) :: mld !! mix layer depth (m) |
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| 79 | REAL(wp), INTENT( in ) :: xqsr !! surface irradiance (W/m2) |
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| 80 | REAL(wp), INTENT( in ) :: xdin !! surface DIN (mmol N/m3) |
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| 81 | REAL(wp), INTENT( inout ) :: dms_surf !! DMS surface concentration (mol/m3) |
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| 82 | REAL(wp), INTENT( inout ) :: dms_andr !! DMS surface concentration (mol/m3) |
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| 83 | REAL(wp), INTENT( inout ) :: dms_simo !! DMS surface concentration (mol/m3) |
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| 84 | REAL(wp), INTENT( inout ) :: dms_aran !! DMS surface concentration (mol/m3) |
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| 85 | REAL(wp), INTENT( inout ) :: dms_hall !! DMS surface concentration (mol/m3) |
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| 86 | ! |
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| 87 | REAL(wp) :: CHL, cmr, sw_dms |
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| 88 | REAL(wp) :: Jterm, Qterm |
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| 89 | !! temporary variables |
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| 90 | REAL(wp) :: fq1,fq2,fq3 |
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| 91 | ! |
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| 92 | !! IJT (30/03/13): DMS calc needs this |
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| 93 | !! Julien : in Simo & Dachs, GBC, 2002, DMS is derived from |
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| 94 | !! CHL/MLD ratio in mg/m4 (i.e. CHL is in mg/m3 |
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| 95 | !! MLD in m). |
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| 96 | !! In MEDUSA, we already have CHL in mg/m3 for both |
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| 97 | !! Diatoms and non-diatoms (zchn,zchd); and mld from |
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| 98 | !! NEMO (hmld) in m. |
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| 99 | CHL = 0.0 |
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| 100 | !! |
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| 101 | !! CHL = mask * TT(I,J,1,PHYTO_TRACER) & |
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| 102 | !! & * c2n_p * mw_carbon / CCHL_P(I,J,1,1) |
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| 103 | CHL = chn+chd !! mg/m3 |
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| 104 | !! |
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| 105 | !! ------------------------------------------------ |
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| 106 | !! Calculate the DMS concentration in nM (nanomol/litre) |
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| 107 | !! from Simo & Dachs, GBC, 2002, modified to be positive-definite |
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| 108 | !! for MLD>182.536m, using DMS=90./MLD (Aranami & Tsunogai, JGR, 2004) |
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| 109 | !! Multiply by 1.0E-6 to convert nM to (mol/m3) |
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| 110 | !! cmr = fm(i,1)*chl/mld(i) |
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| 111 | !! IF (cmr .lt. 0.02) THEN |
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| 112 | !! IF (mld(i) .le. 182.536) THEN |
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| 113 | !! csurf(i,astf_dms) = 1.0e-6*fm(i,1)*(-LOG(mld(i)) + 5.7) |
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| 114 | !! ELSE |
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| 115 | !! csurf(i,astf_dms) = 1.0e-6*fm(i,1)*(90./mld(i)) |
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| 116 | !! ENDIF |
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| 117 | !! ELSE |
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| 118 | !! csurf(i,astf_dms) = 1.0e-6*fm(i,1)*(55.8*cmr + 0.6) |
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| 119 | !! ENDIF |
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| 120 | !! |
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| 121 | cmr = CHL / mld |
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| 122 | ! sw_dms = 0.5 + SIGN( 0.5, cmr - 0.02 ) |
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| 123 | !! Jpalm (11-08-2014) |
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| 124 | !! Explanation about the SIGN function : |
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| 125 | !! not easy to read, but maybe "more elegant and efficient") |
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| 126 | !! here for example: |
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| 127 | !! sw_dms = 1 if cmr is greater than 0.02, |
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| 128 | !! 0 if cmr lower than 0.02 |
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| 129 | !! then |
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| 130 | !! if cmr < 0.02 |
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| 131 | !! dms_surf = 1.0e-6 * 90.0 / mld |
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| 132 | !! or = 1.0e-6 * 5.7 - LOG(mld) |
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| 133 | !! and if cmr > 0.02 |
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| 134 | !! dms_surf = 1.0e-6 * ( 55.8 * cmr + 0.6 ) |
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| 135 | !! what is equivalent to the IF loops formulations. |
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| 136 | !! difference is on the stresholds between mld = 182.536m |
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| 137 | !! (strange value...) |
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| 138 | !! and the Max function... that stay uncertain. |
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| 139 | !! |
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| 140 | ! dms_surf = 1.0e-6 * ( sw_dms * & |
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| 141 | ! & ( 55.8 * cmr + 0.6 ) + ( 1.0 - sw_dms ) * & |
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| 142 | ! & ( MAX( 90.0 / mld, 5.7 - LOG(mld) ) ) ) |
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| 143 | ! |
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| 144 | ! AXY (12/01/15): the DMS equation donated by the UKMO does not match |
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| 145 | ! that reported in Halloran et al. (2010); amend the |
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| 146 | ! equations appropriately |
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| 147 | ! |
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| 148 | if (cmr .lt. 0.02) then |
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| 149 | dms_surf = (-1.0 * log(mld)) + 5.7 |
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| 150 | else |
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| 151 | dms_surf = (55.8 * cmr) + 0.6 |
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| 152 | endif |
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| 153 | ! |
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| 154 | if (mld > 182.5) then |
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| 155 | dms_surf = (90.0 / mld) |
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| 156 | endif |
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| 157 | ! |
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| 158 | dms_surf = 1.0e-6 * dms_surf |
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| 159 | |
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| 160 | ! |
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| 161 | !======================================================================= |
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| 162 | ! |
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| 163 | ! AXY (13/03/15): per remarks above, the following calculations estimate |
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| 164 | ! DMS using all of the schemes examined for UKESM1 |
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| 165 | ! |
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| 166 | ! AXY (13/03/15): Anderson et al. (2001) |
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| 167 | Jterm = xqsr + 1.0e-6 |
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| 168 | !! this next line makes a hard-coded assumption about the |
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| 169 | !! half-saturation constant of MEDUSA (which should be |
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| 170 | !! done properly; perhaps even scaled with the proportion |
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| 171 | !! of diatoms and non-diatoms) |
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| 172 | Qterm = xdin / (xdin + 0.5) |
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| 173 | fq1 = log10(CHL * Jterm * Qterm) |
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| 174 | if (fq1 > 1.72) then |
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| 175 | dms_andr = (8.24 * (fq1 - 1.72)) + 2.29 |
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| 176 | else |
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| 177 | dms_andr = 2.29 |
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| 178 | endif |
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| 179 | dms_andr = 1.0e-6 * dms_andr |
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| 180 | ! |
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| 181 | ! AXY (13/03/15): Simo & Dachs (2002) |
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| 182 | cmr = CHL / mld |
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| 183 | fq1 = (-1 * log(mld)) + 5.7 |
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| 184 | fq2 = (55.8 * cmr) + 0.6 |
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| 185 | if (cmr < 0.02) then |
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| 186 | dms_simo = fq1 |
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| 187 | else |
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| 188 | dms_simo = fq2 |
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| 189 | endif |
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| 190 | dms_simo = 1.0e-6 * dms_simo |
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| 191 | ! |
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| 192 | ! AXY (13/03/15): Aranami & Tsunogai (2004) |
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| 193 | cmr = CHL / mld |
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| 194 | fq1 = 60.0 / mld |
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| 195 | fq2 = (55.8 * cmr) + 0.6 |
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| 196 | if (cmr < 0.02) then |
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| 197 | dms_aran = fq1 |
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| 198 | else |
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| 199 | dms_aran = fq2 |
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| 200 | endif |
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| 201 | dms_aran = 1.0e-6 * dms_aran |
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| 202 | ! |
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| 203 | ! AXY (13/03/15): Halloran et al. (2010) |
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| 204 | cmr = CHL / mld |
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| 205 | fq1 = (-1 * log(mld)) + 5.7 |
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| 206 | fq2 = (55.8 * cmr) + 0.6 |
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| 207 | fq3 = (90.0 / mld) |
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| 208 | if (cmr < 0.02) then |
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| 209 | dms_hall = fq1 |
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| 210 | else |
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| 211 | dms_hall = fq2 |
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| 212 | endif |
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| 213 | if (mld > 182.5) then |
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| 214 | dms_hall = fq3 |
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| 215 | endif |
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| 216 | dms_hall = 1.0e-6 * dms_hall |
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| 217 | |
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| 218 | END SUBROUTINE trc_dms_medusa |
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| 219 | |
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| 220 | |
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| 221 | !======================================================================= |
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| 222 | !======================================================================= |
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| 223 | !======================================================================= |
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| 224 | |
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| 225 | #else |
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| 226 | !!====================================================================== |
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| 227 | !! Dummy module : No MEDUSA bio-model |
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| 228 | !!====================================================================== |
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| 229 | |
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| 230 | CONTAINS |
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| 231 | |
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| 232 | !======================================================================= |
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| 233 | ! |
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| 234 | SUBROUTINE trc_dms_medusa( kt ) !! EMPTY Routine |
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| 235 | ! |
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| 236 | ! |
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| 237 | INTEGER, INTENT( in ) :: kt |
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| 238 | ! |
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| 239 | |
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| 240 | WRITE(*,*) 'trc_dms_medusa: You should not have seen this print! error?' |
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| 241 | |
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| 242 | END SUBROUTINE trc_dms_medusa |
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| 243 | #endif |
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| 244 | |
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| 245 | !!====================================================================== |
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| 246 | END MODULE trcdms_medusa |
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| 247 | |
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| 248 | |
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