| 1 | subroutine hydrol(ptimestep,rnat,tsurf, & |
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| 2 | qsurf,dqsurf,dqs_hyd,pcapcal, & |
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| 3 | albedo0,albedo,mu0,pdtsurf,pdtsurf_hyd,hice) |
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| 4 | |
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| 5 | use watercommon_h, only: To, RLFTT, rhowater, mx_eau_sol |
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| 6 | |
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| 7 | implicit none |
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| 8 | |
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| 9 | !================================================================== |
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| 10 | ! |
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| 11 | ! Purpose |
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| 12 | ! ------- |
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| 13 | ! Calculate the surface hydrology and albedo changes. |
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| 14 | ! |
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| 15 | ! Authors |
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| 16 | ! ------- |
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| 17 | ! Adapted from LMDTERRE by B. Charnay (2010). Further |
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| 18 | ! modifications by R. Wordsworth (2010). |
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| 19 | ! |
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| 20 | ! Called by |
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| 21 | ! --------- |
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| 22 | ! physiq.F |
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| 23 | ! |
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| 24 | ! Calls |
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| 25 | ! ----- |
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| 26 | ! none |
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| 27 | ! |
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| 28 | ! Notes |
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| 29 | ! ----- |
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| 30 | ! rnat is terrain type: 0-ocean; 1-continent |
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| 31 | ! |
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| 32 | !================================================================== |
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| 33 | |
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| 34 | #include "dimensions.h" |
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| 35 | #include "dimphys.h" |
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| 36 | #include "comcstfi.h" |
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| 37 | #include "callkeys.h" |
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| 38 | #include "tracer.h" |
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| 39 | #include "fisice.h" |
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| 40 | #include "comgeomfi.h" |
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| 41 | #include "comdiurn.h" |
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| 42 | #include "surfdat.h" |
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| 43 | |
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| 44 | ! Inputs |
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| 45 | ! ------ |
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| 46 | real albedoocean |
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| 47 | parameter (albedoocean=0.07) |
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| 48 | real albedoice |
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| 49 | save albedoice |
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| 50 | |
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| 51 | real snowlayer |
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| 52 | parameter (snowlayer=33.0) ! 33 kg/m^2 of snow, equal to a layer of 3.3 cm |
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| 53 | real oceantime |
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| 54 | parameter (oceantime=10*24*3600) |
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| 55 | |
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| 56 | logical oceanbulkavg ! relax ocean temperatures to a GLOBAL mean value? |
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| 57 | logical activerunoff ! enable simple runoff scheme? |
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| 58 | logical oceanalbvary ! ocean albedo varies with the diurnal cycle? |
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| 59 | |
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| 60 | ! Arguments |
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| 61 | ! --------- |
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| 62 | integer rnat(ngridmx) ! I changed this to integer (RW) |
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| 63 | real runoff(ngridmx) |
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| 64 | save runoff |
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| 65 | real totalrunoff, tsea, oceanarea |
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| 66 | save oceanarea |
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| 67 | |
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| 68 | real ptimestep |
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| 69 | real mu0(ngridmx) |
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| 70 | real qsurf(ngridmx,nqmx), tsurf(ngridmx) |
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| 71 | real dqsurf(ngridmx,nqmx), pdtsurf(ngridmx) |
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| 72 | real hice(ngridmx) |
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| 73 | real albedo0(ngridmx), albedo(ngridmx) |
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| 74 | |
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| 75 | real oceanarea2 |
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| 76 | |
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| 77 | ! Output |
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| 78 | ! ------ |
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| 79 | real dqs_hyd(ngridmx,nqmx) |
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| 80 | real pdtsurf_hyd(ngridmx) |
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| 81 | |
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| 82 | ! Local |
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| 83 | ! ----- |
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| 84 | real a,b,E |
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| 85 | integer ig,iq, icap ! wld like to remove icap |
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| 86 | real fsnoi, subli, fauxo |
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| 87 | real twater(ngridmx) |
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| 88 | real pcapcal(ngridmx) |
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| 89 | real hicebis(ngridmx) |
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| 90 | real zqsurf(ngridmx,nqmx) |
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| 91 | real ztsurf(ngridmx) |
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| 92 | |
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| 93 | integer ivap, iliq, iice |
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| 94 | save ivap, iliq, iice |
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| 95 | |
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| 96 | logical firstcall |
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| 97 | save firstcall |
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| 98 | |
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| 99 | data firstcall /.true./ |
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| 100 | |
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| 101 | oceanbulkavg=.false. |
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| 102 | activerunoff=.false. |
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| 103 | oceanalbvary=.false. |
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| 104 | |
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| 105 | if(firstcall)then |
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| 106 | |
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| 107 | ivap=igcm_h2o_vap |
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| 108 | iliq=igcm_h2o_vap |
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| 109 | iice=igcm_h2o_ice |
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| 110 | |
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| 111 | write(*,*) "hydrol: ivap=",ivap |
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| 112 | write(*,*) " iliq=",iliq |
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| 113 | write(*,*) " iice=",iice |
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| 114 | |
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| 115 | ! Here's the deal: iice is used in place of igcm_h2o_ice both on the |
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| 116 | ! surface and in the atmosphere. ivap is used in |
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| 117 | ! place of igcm_h2o_vap ONLY in the atmosphere, while |
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| 118 | ! iliq is used in place of igcm_h2o_vap ONLY on the |
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| 119 | ! surface. |
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| 120 | |
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| 121 | ! Soon to be extended to the entire water cycle... |
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| 122 | |
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| 123 | ! Ice albedo = snow albedo for now |
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| 124 | albedoice=albedosnow |
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| 125 | |
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| 126 | ! Total ocean surface area |
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| 127 | oceanarea=0. |
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| 128 | do ig=1,ngridmx |
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| 129 | if(rnat(ig).eq.0)then |
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| 130 | oceanarea=oceanarea+area(ig) |
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| 131 | endif |
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| 132 | enddo |
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| 133 | |
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| 134 | if(oceanbulkavg.and.(oceanarea.le.0.))then |
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| 135 | print*,'How are we supposed to average the ocean' |
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| 136 | print*,'temperature, when there are no oceans?' |
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| 137 | call abort |
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| 138 | endif |
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| 139 | |
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| 140 | if(activerunoff.and.(oceanarea.le.0.))then |
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| 141 | print*,'You have enabled runoff, but you have no oceans.' |
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| 142 | print*,'Where did you think the water was going to go?' |
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| 143 | call abort |
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| 144 | endif |
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| 145 | |
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| 146 | firstcall = .false. |
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| 147 | endif |
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| 148 | |
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| 149 | ! add physical tendencies already calculated |
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| 150 | ! ------------------------------------------ |
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| 151 | |
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| 152 | do ig=1,ngridmx |
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| 153 | ztsurf(ig) = tsurf(ig) + ptimestep*pdtsurf(ig) |
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| 154 | pdtsurf_hyd(ig)=0.0 |
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| 155 | do iq=1,nqmx |
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| 156 | zqsurf(ig,iq) = qsurf(ig,iq) + ptimestep*dqsurf(ig,iq) |
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| 157 | enddo |
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| 158 | enddo |
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| 159 | |
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| 160 | do ig=1,ngridmx |
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| 161 | do iq=1,nqmx |
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| 162 | dqs_hyd(ig,iq) = 0.0 |
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| 163 | enddo |
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| 164 | enddo |
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| 165 | |
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| 166 | do ig = 1, ngridmx |
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| 167 | |
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| 168 | ! Ocean |
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| 169 | ! ----- |
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| 170 | if(rnat(ig).eq.0)then |
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| 171 | |
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| 172 | ! re-calculate oceanic albedo |
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| 173 | if(diurnal.and.oceanalbvary)then |
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| 174 | fauxo = ( 1.47 - ACOS( mu0(ig) ) )/0.15 ! where does this come from (Benjamin)? |
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| 175 | albedo(ig) = 1.1*( .03 + .630/( 1. + fauxo*fauxo)) |
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| 176 | albedo(ig) = MAX(MIN(albedo(ig),0.60),0.04) |
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| 177 | else |
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| 178 | albedo(ig) = albedoocean ! modif Benjamin |
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| 179 | end if |
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| 180 | |
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| 181 | ! calculate oceanic ice height including the latent heat of ice formation |
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| 182 | ! hice is the height of oceanic ice with a maximum of maxicethick. |
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| 183 | hice(ig) = zqsurf(ig,iice)/rhowater ! update hice to include recent snowfall |
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| 184 | |
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| 185 | ! twater(ig) = tsurf(ig) + ptimestep*zdtsurf(ig) & |
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| 186 | twater(ig) = ztsurf(ig) - hice(ig)*RLFTT*rhowater/pcapcal(ig) |
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| 187 | ! this is temperature water would have if we melted entire ocean ice layer |
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| 188 | hicebis(ig) = hice(ig) |
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| 189 | hice(ig) = 0. |
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| 190 | |
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| 191 | if(twater(ig) .lt. To)then |
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| 192 | E=min((To+Tsaldiff-twater(ig))*pcapcal(ig),RLFTT*rhowater*maxicethick) |
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| 193 | hice(ig) = E/(RLFTT*rhowater) |
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| 194 | hice(ig) = max(hice(ig),0.0) |
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| 195 | hice(ig) = min(hice(ig),maxicethick) |
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| 196 | pdtsurf_hyd(ig) = (hice(ig) - hicebis(ig))*RLFTT* & |
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| 197 | rhowater/pcapcal(ig)/ptimestep |
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| 198 | albedo(ig) = albedoice |
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| 199 | |
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| 200 | ! if (zqsurf(ig,iice).ge.snowlayer) then |
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| 201 | ! albedo(ig) = albedoice |
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| 202 | ! else |
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| 203 | ! albedo(ig) = albedoocean & |
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| 204 | ! + (albedosnow - albedoocean)*zqsurf(ig,iice)/snowlayer |
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| 205 | ! endif |
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| 206 | |
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| 207 | else |
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| 208 | |
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| 209 | pdtsurf_hyd(ig) = -hicebis(ig)*RLFTT*rhowater/pcapcal(ig)/ptimestep |
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| 210 | albedo(ig) = albedoocean |
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| 211 | |
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| 212 | endif |
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| 213 | |
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| 214 | zqsurf(ig,iliq) = zqsurf(ig,iliq)-(hice(ig)*rhowater-zqsurf(ig,iice)) |
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| 215 | zqsurf(ig,iice) = hice(ig)*rhowater |
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| 216 | |
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| 217 | |
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| 218 | ! Continent |
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| 219 | ! --------- |
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| 220 | elseif (rnat(ig).eq.1) then |
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| 221 | |
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| 222 | ! melt the snow |
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| 223 | if(ztsurf(ig).gt.To)then |
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| 224 | if(zqsurf(ig,iice).gt.1.0e-8)then |
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| 225 | |
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| 226 | a = (ztsurf(ig)-To)*pcapcal(ig)/RLFTT |
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| 227 | b = zqsurf(ig,iice) |
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| 228 | fsnoi = min(a,b) |
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| 229 | |
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| 230 | zqsurf(ig,iice) = zqsurf(ig,iice) - fsnoi |
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| 231 | zqsurf(ig,iliq) = zqsurf(ig,iliq) + fsnoi |
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| 232 | |
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| 233 | ! thermal effects |
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| 234 | pdtsurf_hyd(ig) = -fsnoi*RLFTT/pcapcal(ig)/ptimestep |
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| 235 | |
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| 236 | endif |
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| 237 | else |
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| 238 | |
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| 239 | ! freeze the water |
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| 240 | if(zqsurf(ig,iliq).gt.1.0e-8)then |
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| 241 | |
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| 242 | a = -(ztsurf(ig)-To)*pcapcal(ig)/RLFTT |
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| 243 | b = zqsurf(ig,iliq) |
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| 244 | |
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| 245 | fsnoi = min(a,b) |
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| 246 | |
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| 247 | zqsurf(ig,iice) = zqsurf(ig,iice) + fsnoi |
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| 248 | zqsurf(ig,iliq) = zqsurf(ig,iliq) - fsnoi |
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| 249 | |
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| 250 | ! thermal effects |
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| 251 | pdtsurf_hyd(ig) = +fsnoi*RLFTT/pcapcal(ig)/ptimestep |
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| 252 | |
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| 253 | endif |
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| 254 | endif |
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| 255 | |
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| 256 | ! deal with runoff |
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| 257 | if(activerunoff)then |
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| 258 | |
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| 259 | runoff(ig) = max(zqsurf(ig,iliq) - mx_eau_sol, 0.0) |
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| 260 | if(ngridmx.gt.1)then ! runoff only exists in 3D |
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| 261 | if(runoff(ig).ne.0.0)then |
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| 262 | zqsurf(ig,iliq) = mx_eau_sol |
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| 263 | ! runoff is added to ocean at end |
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| 264 | endif |
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| 265 | end if |
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| 266 | |
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| 267 | endif |
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| 268 | |
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| 269 | ! re-calculate continental albedo |
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| 270 | albedo(ig) = albedo0(ig) ! albedo0 = base values |
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| 271 | if (zqsurf(ig,iice).ge.snowlayer) then |
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| 272 | albedo(ig) = albedosnow |
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| 273 | else |
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| 274 | albedo(ig) = albedo0(ig) & |
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| 275 | + (albedosnow - albedo0(ig))*zqsurf(ig,iice)/snowlayer |
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| 276 | endif |
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| 277 | |
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| 278 | else |
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| 279 | |
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| 280 | print*,'Surface type not recognised in hydrol.F!' |
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| 281 | print*,'Exiting...' |
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| 282 | call abort |
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| 283 | |
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| 284 | endif |
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| 285 | |
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| 286 | end do ! ig=1,ngridmx |
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| 287 | |
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| 288 | ! perform crude bulk averaging of temperature in ocean |
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| 289 | ! ---------------------------------------------------- |
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| 290 | if(oceanbulkavg)then |
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| 291 | |
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| 292 | oceanarea2=0. |
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| 293 | DO ig=1,ngridmx |
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| 294 | if((rnat(ig).eq.0).and.(hice(ig).eq.0.))then |
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| 295 | oceanarea2=oceanarea2+area(ig)*pcapcal(ig) |
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| 296 | end if |
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| 297 | END DO |
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| 298 | |
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| 299 | tsea=0. |
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| 300 | DO ig=1,ngridmx |
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| 301 | if((rnat(ig).eq.0).and.(hice(ig).eq.0.))then |
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| 302 | tsea=tsea+ztsurf(ig)*area(ig)*pcapcal(ig)/oceanarea2 |
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| 303 | end if |
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| 304 | END DO |
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| 305 | |
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| 306 | DO ig=1,ngridmx |
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| 307 | if((rnat(ig).eq.0).and.(hice(ig).eq.0))then |
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| 308 | pdtsurf_hyd(ig) = pdtsurf_hyd(ig) + (tsea-ztsurf(ig))/oceantime |
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| 309 | end if |
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| 310 | END DO |
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| 311 | |
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| 312 | print*,'Mean ocean temperature = ',tsea,' K' |
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| 313 | |
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| 314 | endif |
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| 315 | |
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| 316 | ! shove all the runoff water into the ocean |
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| 317 | ! ----------------------------------------- |
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| 318 | if(activerunoff)then |
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| 319 | |
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| 320 | totalrunoff=0. |
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| 321 | do ig=1,ngridmx |
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| 322 | if (rnat(ig).eq.1) then |
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| 323 | totalrunoff = totalrunoff + area(ig)*runoff(ig) |
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| 324 | endif |
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| 325 | enddo |
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| 326 | |
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| 327 | do ig=1,ngridmx |
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| 328 | if (rnat(ig).eq.0) then |
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| 329 | zqsurf(ig,iliq) = zqsurf(ig,iliq) + & |
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| 330 | totalrunoff/oceanarea |
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| 331 | endif |
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| 332 | enddo |
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| 333 | |
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| 334 | endif |
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| 335 | |
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| 336 | ! Re-add the albedo effects of CO2 ice if necessary |
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| 337 | ! ------------------------------------------------- |
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| 338 | if(co2cond)then |
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| 339 | |
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| 340 | icap=1 |
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| 341 | do ig=1,ngridmx |
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| 342 | if (qsurf(ig,igcm_co2_ice).gt.0) then |
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| 343 | albedo(ig) = albedice(icap) |
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| 344 | endif |
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| 345 | enddo |
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| 346 | |
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| 347 | endif |
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| 348 | |
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| 349 | |
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| 350 | do ig=1,ngridmx |
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| 351 | dqs_hyd(ig,iliq)=(zqsurf(ig,iliq) - qsurf(ig,iliq))/ptimestep |
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| 352 | dqs_hyd(ig,iice)=(zqsurf(ig,iice) - qsurf(ig,iice))/ptimestep |
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| 353 | enddo |
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| 354 | |
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| 355 | call writediagfi(ngridmx,'runoff','Runoff amount',' ',2,runoff) |
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| 356 | |
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| 357 | return |
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| 358 | end subroutine hydrol |
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