[5726] | 1 | MODULE trcoxy_medusa |
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| 2 | !!====================================================================== |
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| 3 | !! *** MODULE trcoxy_medusa *** |
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| 4 | !! TOP : MEDUSA |
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| 5 | !!====================================================================== |
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| 6 | !! History : |
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| 7 | !! - ! 2011-07 (A. Yool) added for ROAM 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 oxygen cycle |
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| 12 | !!---------------------------------------------------------------------- |
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| 13 | !! trc_oxy_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 | |
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| 21 | IMPLICIT NONE |
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| 22 | PRIVATE |
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| 23 | |
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| 24 | PUBLIC trc_oxy_medusa ! called in trc_bio_medusa |
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| 25 | |
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| 26 | !!* Substitution |
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| 27 | # include "domzgr_substitute.h90" |
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| 28 | !!---------------------------------------------------------------------- |
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| 29 | !! NEMO/TOP 2.0 , LOCEAN-IPSL (2007) |
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| 30 | !! $Id$ |
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| 31 | !! Software governed by the CeCILL licence (modipsl/doc/NEMO_CeCILL.txt) |
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| 32 | !!---------------------------------------------------------------------- |
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| 33 | |
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| 34 | ! The following is a map of the subroutines contained within this module |
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| 35 | ! - trc_oxy_medusa |
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| 36 | ! - CALLS oxy_schmidt |
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| 37 | ! - CALLS oxy_sato |
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| 38 | |
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| 39 | CONTAINS |
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| 40 | |
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| 41 | !======================================================================= |
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| 42 | ! |
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[5841] | 43 | SUBROUTINE trc_oxy_medusa( pt, ps, kw660, pp0, o2, & !! inputs |
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| 44 | kwo2, o2flux, o2sat ) !! outputs |
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[5726] | 45 | ! |
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| 46 | !======================================================================= |
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| 47 | !! |
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| 48 | !! Title : Calculates O2 change due to air-sea gas exchange |
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| 49 | !! Author : Andrew Yool |
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| 50 | !! Date : 15/10/04 (revised 08/07/11) |
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| 51 | !! |
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| 52 | !! This subroutine calculates oxygen air-sea gas exchange in the |
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| 53 | !! surface layer of the ocean. The formulation is taken from one |
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| 54 | !! written by Ray Najjar for the OCMIP-2 project. The routine |
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| 55 | !! calls two other subroutines, oxy_schmidt.f (calculates Schmidt |
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| 56 | !! number of oxygen) and oxy_sato.f (calculates oxygen saturation |
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| 57 | !! concentration at 1 atm). |
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[5841] | 58 | !! |
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| 59 | !! AXY (23/06/15): revised to allow common gas transfer velocity |
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| 60 | !! to be used for CO2 and O2; outputs of this |
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| 61 | !! routine amended to mmol/m3 from mol/m3 |
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[5726] | 62 | !! |
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| 63 | !! Function inputs are (in order) : |
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| 64 | !! pt temperature (degrees C) |
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| 65 | !! ps salinity (PSU) |
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[5841] | 66 | !! kw660 gas transfer velocity (m/s) |
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[5726] | 67 | !! pp0 surface pressure (divided by 1 atm) |
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[5841] | 68 | !! o2 surface O2 concentration (mmol/m3) |
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| 69 | !! (+) kwo2 gas transfer velocity for O2 (m/s) |
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| 70 | !! (*) o2flux exchange rate of oxygen (mmol/m2/s) |
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| 71 | !! (+) o2sat oxygen saturation concentration (mmol/m3) |
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[5726] | 72 | !! |
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| 73 | !! Where (*) is the function output (note its units). |
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| 74 | !! |
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| 75 | !======================================================================= |
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| 76 | |
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| 77 | implicit none |
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| 78 | ! |
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| 79 | REAL(wp), INTENT( in ) :: pt |
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| 80 | REAL(wp), INTENT( in ) :: ps |
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[5841] | 81 | REAL(wp), INTENT( in ) :: kw660 |
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[5726] | 82 | REAL(wp), INTENT( in ) :: pp0 |
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| 83 | REAL(wp), INTENT( in ) :: o2 |
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[5841] | 84 | REAL(wp), INTENT( out ) :: kwo2, o2flux, o2sat |
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[5726] | 85 | ! |
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[5841] | 86 | REAL(wp) :: o2schmidt, o2sato, mol_o2 |
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[5726] | 87 | ! |
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[5841] | 88 | ! Oxygen to mol / m3 |
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[5726] | 89 | ! |
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[5841] | 90 | mol_o2 = o2 / 1000. |
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| 91 | ! |
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[5726] | 92 | ! Calculate oxygen Schmidt number |
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| 93 | ! |
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| 94 | call oxy_schmidt(pt, o2schmidt) |
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| 95 | ! |
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| 96 | ! Calculate the transfer velocity for O2 (m/s) |
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| 97 | ! |
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| 98 | kwo2 = kw660 * (660 / o2schmidt)**0.5 |
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| 99 | ! |
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| 100 | ! Calculate the saturation concentration for oxygen (mol/m3) |
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| 101 | ! |
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| 102 | call oxy_sato(pt, ps, o2sato) |
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| 103 | o2sat = o2sato * pp0 |
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| 104 | ! |
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| 105 | ! Calculate time rate of change of O2 due to gas exchange (mol/m3/s) |
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| 106 | ! |
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[5841] | 107 | o2flux = kwo2 * (o2sat - mol_o2) |
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[5726] | 108 | ! |
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[5841] | 109 | ! Oxygen flux and saturation to mmol / m3 |
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| 110 | ! |
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| 111 | o2sat = o2sat * 1000. |
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| 112 | o2flux = o2flux * 1000. |
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| 113 | ! |
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[5726] | 114 | END SUBROUTINE trc_oxy_medusa |
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| 115 | |
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| 116 | !======================================================================= |
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| 117 | !======================================================================= |
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| 118 | !======================================================================= |
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| 119 | |
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| 120 | !======================================================================= |
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| 121 | ! |
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| 122 | SUBROUTINE oxy_schmidt( pt, & !! input |
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| 123 | o2_schmidt ) !! output |
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| 124 | ! |
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| 125 | !======================================================================= |
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| 126 | !! |
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| 127 | !! Title : Calculates Schmidt number for ocean uptake of O2 |
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| 128 | !! Author : Andrew Yool |
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| 129 | !! Date : 14/10/04 (revised 08/07/11) |
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| 130 | !! |
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| 131 | !! This subroutine calculates the Schmidt number for O2 using sea |
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| 132 | !! surface temperature. The code is based upon that developed as |
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| 133 | !! part of the OCMIP-2 project (1998-2000). The coefficients used |
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| 134 | !! are taken from Keeling et al. (1998, GBC, 12, 141-163). |
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| 135 | !! |
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[5841] | 136 | !! AXY (23/06/2015) |
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| 137 | !! UPDATED: revised formulation from Wanninkhof (2014) for |
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| 138 | !! consistency with MOCSY |
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| 139 | !! |
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| 140 | !! Winninkhof, R. (2014). Relationship between wind speed and gas |
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| 141 | !! exchange over the ocean revisited. LIMNOLOGY AND OCEANOGRAPHY-METHODS |
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| 142 | !! 12, 351-362, doi:10.4319/lom.2014.12.351 |
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| 143 | !! |
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[5726] | 144 | !! Function inputs are (in order) : |
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| 145 | !! t temperature (degrees C) |
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| 146 | !! (*) o2_schmidt oxygen Schmidt number |
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| 147 | !! |
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| 148 | !! Where (*) is the function output. |
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| 149 | !! |
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| 150 | !======================================================================= |
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| 151 | |
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| 152 | implicit none |
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| 153 | ! |
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| 154 | REAL(wp) :: pt, o2_schmidt |
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[5841] | 155 | REAL(wp) :: a0, a1, a2, a3, a4 |
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[5726] | 156 | ! |
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[5841] | 157 | ! AXY (23/06/15): OCMIP-2 coefficients |
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| 158 | ! data a0 / 1638.0 / |
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| 159 | ! data a1 / -81.83 / |
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| 160 | ! data a2 / 1.483 / |
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| 161 | ! data a3 / -0.008004 / |
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[5726] | 162 | ! |
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[5841] | 163 | ! AXY (23/06/15): Wanninkhof (2014) coefficients |
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| 164 | data a0 / 1920.4 / |
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| 165 | data a1 / -135.6 / |
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| 166 | data a2 / 5.2121 / |
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| 167 | data a3 / -0.10939 / |
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| 168 | data a4 / 0.00093777 / |
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[5726] | 169 | ! |
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[5841] | 170 | ! o2_schmidt = a0 + pt*(a1 + pt*(a2 + pt*a3)) |
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| 171 | o2_schmidt = a0 + pt*(a1 + pt*(a2 + pt*(a3 + pt*a4))) |
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| 172 | ! |
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[5726] | 173 | END SUBROUTINE oxy_schmidt |
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| 174 | |
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| 175 | !======================================================================= |
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| 176 | !======================================================================= |
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| 177 | !======================================================================= |
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| 178 | |
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| 179 | !======================================================================= |
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| 180 | ! |
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| 181 | SUBROUTINE oxy_sato( pt, ps, & !! inputs |
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| 182 | o2_sato ) !! output |
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| 183 | ! |
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| 184 | !======================================================================= |
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| 185 | !! |
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| 186 | !! Title : Calculates O2 saturation at 1 atm pressure |
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| 187 | !! Author : Andrew Yool |
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| 188 | !! Date : 14/10/04 (revised 08/07/11) |
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| 189 | !! |
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| 190 | !! This subroutine calculates the oxygen saturation concentration |
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| 191 | !! at 1 atmosphere pressure in mol/m3 given ambient temperature |
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| 192 | !! and salinity. This formulation is (ostensibly) taken from |
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| 193 | !! Garcia & Gordon (1992, L&O, 1307-1312). The function works |
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| 194 | !! in the range -1.9 <= T <= 40, 0 <= S <= 42. |
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| 195 | !! |
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| 196 | !! Function inputs are (in order) : |
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| 197 | !! pt temperature (degrees C) |
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| 198 | !! ps salinity (PSU) |
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| 199 | !! (*) o2_sato oxygen saturation (mol/m3) |
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| 200 | !! |
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| 201 | !! Where (*) is the function output (note its units). |
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| 202 | !! |
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| 203 | !! Check value : T = 10, S = 35, oxy_sato = 0.282015 mol/m3 |
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| 204 | !! |
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| 205 | !======================================================================= |
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| 206 | |
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| 207 | implicit none |
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| 208 | ! |
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| 209 | REAL(wp) :: pt, ps, o2_sato |
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| 210 | ! |
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| 211 | REAL(wp) :: a0, a1, a2, a3, a4, a5 |
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| 212 | REAL(wp) :: b0, b1, b2, b3 |
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| 213 | REAL(wp) :: c0 |
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| 214 | ! |
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| 215 | REAL(wp) :: tt, tk, ts, ts2, ts3, ts4, ts5 |
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| 216 | REAL(wp) :: ans1, ans2 |
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| 217 | ! |
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| 218 | data a0 / 2.00907 / |
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| 219 | data a1 / 3.22014 / |
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| 220 | data a2 / 4.05010 / |
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| 221 | data a3 / 4.94457 / |
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| 222 | data a4 / -2.56847E-1 / |
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| 223 | data a5 / 3.88767 / |
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| 224 | ! |
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| 225 | data b0 / -6.24523E-3 / |
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| 226 | data b1 / -7.37614E-3 / |
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| 227 | data b2 / -1.03410E-2 / |
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| 228 | data b3 / -8.17083E-3 / |
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| 229 | ! |
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| 230 | data c0 / -4.88682E-7 / |
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| 231 | ! |
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| 232 | tt = 298.15 - pt |
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| 233 | tk = 273.15 + pt |
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| 234 | ts = log(tt / tk) |
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| 235 | ts2 = ts**2 |
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| 236 | ts3 = ts**3 |
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| 237 | ts4 = ts**4 |
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| 238 | ts5 = ts**5 |
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| 239 | ans1 = a0 + a1*ts + a2*ts2 + a3*ts3 + a4*ts4 + a5*ts5 & |
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| 240 | + ps*(b0 + b1*ts + b2*ts2 + b3*ts3) & |
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| 241 | + c0*(ps*ps) |
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| 242 | ans2 = exp(ans1) |
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| 243 | ! |
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| 244 | ! Convert from ml/l to mol/m3 |
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| 245 | ! |
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| 246 | o2_sato = (ans2 / 22391.6) * 1000.0 |
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| 247 | ! |
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| 248 | END SUBROUTINE oxy_sato |
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| 249 | |
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| 250 | !======================================================================= |
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| 251 | !======================================================================= |
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| 252 | !======================================================================= |
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| 253 | |
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| 254 | #else |
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| 255 | !!====================================================================== |
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| 256 | !! Dummy module : No MEDUSA bio-model |
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| 257 | !!====================================================================== |
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| 258 | |
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| 259 | CONTAINS |
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| 260 | |
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[5841] | 261 | SUBROUTINE trc_oxy_medusa( pt, ps, kw660, pp0, o2, & !! inputs |
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| 262 | o2flux, o2sat ) !! outputs |
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[5726] | 263 | USE par_kind |
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| 264 | |
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| 265 | REAL(wp), INTENT( in ) :: pt |
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| 266 | REAL(wp), INTENT( in ) :: ps |
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[5841] | 267 | REAL(wp), INTENT( in ) :: kw660 |
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[5726] | 268 | REAL(wp), INTENT( in ) :: pp0 |
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| 269 | REAL(wp), INTENT( in ) :: o2 |
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[5841] | 270 | REAL(wp), INTENT( inout ) :: o2flux, o2sat |
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[5726] | 271 | |
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| 272 | WRITE(*,*) 'trc_oxy_medusa: You should not have seen this print! error?', kt |
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| 273 | |
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| 274 | END SUBROUTINE trc_oxy_medusa |
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| 275 | #endif |
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| 276 | |
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| 277 | !!====================================================================== |
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| 278 | END MODULE trcoxy_medusa |
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| 279 | |
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