[2187] | 1 | MODULE sbcdcy |
---|
| 2 | !!====================================================================== |
---|
| 3 | !! *** MODULE sbcdcy *** |
---|
| 4 | !! Ocean forcing: compute the diurnal cycle |
---|
| 5 | !!====================================================================== |
---|
[2188] | 6 | !! History : OPA ! 2005-02 (D. Bernie) Original code |
---|
| 7 | !! NEMO 2.0 ! 2006-02 (S. Masson, G. Madec) adaptation to NEMO |
---|
| 8 | !! 3.1 ! 2009-07 (J.M. Molines) adaptation to v3.1 |
---|
[2187] | 9 | !!---------------------------------------------------------------------- |
---|
| 10 | |
---|
| 11 | !!---------------------------------------------------------------------- |
---|
| 12 | !! sbc_dcy : compute solar flux at kt from daily mean, taking |
---|
| 13 | !! diurnal cycle into account |
---|
| 14 | !!---------------------------------------------------------------------- |
---|
| 15 | USE oce ! ocean dynamics and tracers |
---|
| 16 | USE phycst ! ocean physics |
---|
| 17 | USE dom_oce ! ocean space and time domain |
---|
[2210] | 18 | USE sbc_oce ! Surface boundary condition: ocean fields |
---|
[2187] | 19 | USE in_out_manager ! I/O manager |
---|
| 20 | |
---|
| 21 | IMPLICIT NONE |
---|
| 22 | PRIVATE |
---|
[2216] | 23 | INTEGER, PUBLIC :: nday_qsr ! day when parameters were computed |
---|
[2188] | 24 | REAL(wp), DIMENSION(jpi,jpj) :: raa , rbb , rcc , rab ! parameters used to compute the diurnal cycle |
---|
| 25 | REAL(wp), DIMENSION(jpi,jpj) :: rtmd, rdawn, rdusk, rscal ! - - - - - |
---|
[2187] | 26 | |
---|
[2188] | 27 | PUBLIC sbc_dcy ! routine called by sbc |
---|
[2187] | 28 | |
---|
| 29 | !!---------------------------------------------------------------------- |
---|
[2188] | 30 | !! NEMO/OPA 3.3 , NEMO-consortium (2010) |
---|
[2187] | 31 | !! $Id$ |
---|
| 32 | !! Software governed by the CeCILL licence (modipsl/doc/NEMO_CeCILL.txt) |
---|
| 33 | !!---------------------------------------------------------------------- |
---|
| 34 | CONTAINS |
---|
| 35 | |
---|
[2216] | 36 | FUNCTION sbc_dcy( pqsrin ) RESULT( zqsrout ) |
---|
[2187] | 37 | !!---------------------------------------------------------------------- |
---|
| 38 | !! *** ROUTINE sbc_dcy *** |
---|
| 39 | !! |
---|
| 40 | !! ** Purpose : introduce a diurnal cycle of qsr from daily values |
---|
| 41 | !! |
---|
[2188] | 42 | !! ** Method : see Appendix A of Bernie et al. 2007. |
---|
[2187] | 43 | !! |
---|
| 44 | !! ** Action : redistribute daily QSR on each time step following the diurnal cycle |
---|
[2188] | 45 | !! |
---|
| 46 | !! reference : Bernie, DJ, E Guilyardi, G Madec, JM Slingo, and SJ Woolnough, 2007 |
---|
| 47 | !! Impact of resolving the diurnal cycle in an ocean--atmosphere GCM. |
---|
| 48 | !! Part 1: a diurnally forced OGCM. Climate Dynamics 29:6, 575-590. |
---|
[2187] | 49 | !!---------------------------------------------------------------------- |
---|
[2210] | 50 | REAL(wp), DIMENSION(jpi,jpj), INTENT(in ) :: pqsrin ! input daily QSR flux |
---|
[2187] | 51 | !! |
---|
[2210] | 52 | INTEGER :: ji, jj ! dummy loop indices |
---|
[2187] | 53 | REAL(wp) :: ztwopi, zinvtwopi, zconvrad |
---|
| 54 | REAL(wp) :: zlo, zup, zlousd, zupusd |
---|
[2210] | 55 | REAL(wp) :: zdsws, zdecrad, ztx, zsin, zcos |
---|
[2187] | 56 | REAL(wp) :: ztmp, ztmp1, ztmp2, ztest |
---|
[2210] | 57 | REAL(wp), DIMENSION(jpi,jpj) :: zqsrout ! output QSR flux with diurnal cycle |
---|
[2188] | 58 | !---------------------------statement functions------------------------ |
---|
[2210] | 59 | REAL(wp) :: fintegral, pt1, pt2, paaa, pbbb, pccc ! dummy statement function arguments |
---|
[2188] | 60 | fintegral( pt1, pt2, paaa, pbbb, pccc ) = & |
---|
[2187] | 61 | & paaa * pt2 + zinvtwopi * pbbb * SIN(pccc + ztwopi * pt2) & |
---|
| 62 | & - paaa * pt1 - zinvtwopi * pbbb * SIN(pccc + ztwopi * pt1) |
---|
[2188] | 63 | !!--------------------------------------------------------------------- |
---|
[2187] | 64 | |
---|
| 65 | ! Initialization |
---|
| 66 | ! -------------- |
---|
| 67 | ztwopi = 2. * rpi |
---|
| 68 | zinvtwopi = 1. / ztwopi |
---|
| 69 | zconvrad = ztwopi / 360. |
---|
| 70 | |
---|
| 71 | ! When are we during the day (from 0 to 1) |
---|
[2210] | 72 | zlo = ( REAL(nsec_day, wp) - 0.5 * rdttra(1) ) / rday |
---|
| 73 | zup = zlo + ( REAL(nn_fsbc, wp) * rdttra(1) ) / rday |
---|
[2187] | 74 | |
---|
| 75 | ! |
---|
[2216] | 76 | IF( nday_qsr == -1 ) THEN ! first time step only |
---|
[2187] | 77 | IF(lwp) THEN |
---|
| 78 | WRITE(numout,*) |
---|
| 79 | WRITE(numout,*) 'sbc_dcy : introduce diurnal cycle from daily mean qsr' |
---|
| 80 | WRITE(numout,*) '~~~~~~~' |
---|
| 81 | WRITE(numout,*) |
---|
| 82 | ENDIF |
---|
[2188] | 83 | ! Compute rcc needed to compute the time integral of the diurnal cycle |
---|
| 84 | rcc(:,:) = zconvrad * glamt(:,:) - rpi |
---|
[2187] | 85 | ! time of midday |
---|
[2188] | 86 | rtmd(:,:) = 0.5 - glamt(:,:) / 360. |
---|
| 87 | rtmd(:,:) = MOD( (rtmd(:,:) + 1.), 1. ) |
---|
[2187] | 88 | ENDIF |
---|
| 89 | |
---|
| 90 | ! If this is a new day, we have to update the dawn, dusk and scaling function |
---|
| 91 | !---------------------- |
---|
| 92 | |
---|
| 93 | ! 2.1 dawn and dusk |
---|
| 94 | |
---|
| 95 | ! nday is the number of days since the beginning of the current month |
---|
[2188] | 96 | IF( nday_qsr /= nday ) THEN |
---|
[2187] | 97 | ! save the day of the year and the daily mean of qsr |
---|
[2188] | 98 | nday_qsr = nday |
---|
[2187] | 99 | ! number of days since the previous winter solstice (supposed to be always 21 December) |
---|
[2210] | 100 | zdsws = REAL(11 + nday_year, wp) |
---|
[2187] | 101 | ! declination of the earths orbit |
---|
| 102 | zdecrad = (-23.5 * zconvrad) * COS( zdsws * ztwopi / REAL(nyear_len(1),wp) ) |
---|
| 103 | ! Compute A and B needed to compute the time integral of the diurnal cycle |
---|
| 104 | |
---|
[2210] | 105 | zsin = SIN( zdecrad ) ; zcos = COS( zdecrad ) |
---|
[2187] | 106 | DO jj = 1, jpj |
---|
| 107 | DO ji = 1, jpi |
---|
| 108 | ztmp = zconvrad * gphit(ji,jj) |
---|
[2210] | 109 | raa(ji,jj) = SIN( ztmp ) * zsin |
---|
| 110 | rbb(ji,jj) = COS( ztmp ) * zcos |
---|
[2187] | 111 | END DO |
---|
| 112 | END DO |
---|
| 113 | |
---|
| 114 | ! Compute the time of dawn and dusk |
---|
| 115 | |
---|
[2188] | 116 | ! rab to test if the day time is equal to 0, less than 24h of full day |
---|
| 117 | rab(:,:) = -raa(:,:) / rbb(:,:) |
---|
[2187] | 118 | DO jj = 1, jpj |
---|
| 119 | DO ji = 1, jpi |
---|
[2188] | 120 | IF ( ABS(rab(ji,jj)) < 1 ) THEN ! day duration is less than 24h |
---|
[2187] | 121 | ! When is it night? |
---|
[2188] | 122 | ztx = zinvtwopi * (ACOS(rab(ji,jj)) - rcc(ji,jj)) |
---|
| 123 | ztest = -rbb(ji,jj) * SIN( rcc(ji,jj) + ztwopi * ztx ) |
---|
[2187] | 124 | ! is it dawn or dusk? |
---|
| 125 | IF ( ztest > 0 ) THEN |
---|
[2188] | 126 | rdawn(ji,jj) = ztx |
---|
| 127 | rdusk(ji,jj) = rtmd(ji,jj) + ( rtmd(ji,jj) - rdawn(ji,jj) ) |
---|
[2187] | 128 | ELSE |
---|
[2188] | 129 | rdusk(ji,jj) = ztx |
---|
| 130 | rdawn(ji,jj) = rtmd(ji,jj) - ( rdusk(ji,jj) - rtmd(ji,jj) ) |
---|
[2187] | 131 | ENDIF |
---|
| 132 | ELSE |
---|
[2188] | 133 | rdawn(ji,jj) = rtmd(ji,jj) + 0.5 |
---|
| 134 | rdusk(ji,jj) = rdawn(ji,jj) |
---|
[2187] | 135 | ENDIF |
---|
| 136 | END DO |
---|
| 137 | END DO |
---|
[2188] | 138 | rdawn(:,:) = MOD((rdawn(:,:) + 1.), 1.) |
---|
| 139 | rdusk(:,:) = MOD((rdusk(:,:) + 1.), 1.) |
---|
[2187] | 140 | |
---|
| 141 | ! 2.2 Compute the scalling function: |
---|
| 142 | ! S* = the inverse of the time integral of the diurnal cycle from dawm to dusk |
---|
| 143 | DO jj = 1, jpj |
---|
| 144 | DO ji = 1, jpi |
---|
[2188] | 145 | IF ( ABS(rab(ji,jj)) < 1 ) THEN ! day duration is less than 24h |
---|
| 146 | IF ( rdawn(ji,jj) < rdusk(ji,jj) ) THEN ! day time in one part |
---|
| 147 | rscal(ji,jj) = fintegral(rdawn(ji,jj), rdusk(ji,jj), raa(ji,jj), rbb(ji,jj), rcc(ji,jj)) |
---|
| 148 | rscal(ji,jj) = 1. / rscal(ji,jj) |
---|
| 149 | ELSE ! day time in two parts |
---|
| 150 | rscal(ji,jj) = fintegral(0., rdusk(ji,jj), raa(ji,jj), rbb(ji,jj), rcc(ji,jj)) & |
---|
| 151 | & + fintegral(rdawn(ji,jj), 1., raa(ji,jj), rbb(ji,jj), rcc(ji,jj)) |
---|
| 152 | rscal(ji,jj) = 1. / rscal(ji,jj) |
---|
[2187] | 153 | ENDIF |
---|
| 154 | ELSE |
---|
[2188] | 155 | IF ( raa(ji,jj) > rbb(ji,jj) ) THEN ! 24h day |
---|
| 156 | rscal(ji,jj) = fintegral(0., 1., raa(ji,jj), rbb(ji,jj), rcc(ji,jj)) |
---|
| 157 | rscal(ji,jj) = 1. / rscal(ji,jj) |
---|
| 158 | ELSE ! No day |
---|
| 159 | rscal(ji,jj) = 0.e0 |
---|
[2187] | 160 | ENDIF |
---|
| 161 | ENDIF |
---|
| 162 | END DO |
---|
| 163 | END DO |
---|
| 164 | ! |
---|
[2210] | 165 | ztmp = rday / ( rdttra(1) * REAL(nn_fsbc, wp) ) |
---|
[2188] | 166 | rscal(:,:) = rscal(:,:) * ztmp |
---|
[2187] | 167 | |
---|
| 168 | ENDIF |
---|
| 169 | |
---|
[2188] | 170 | ! 3. update qsr with the diurnal cycle |
---|
| 171 | ! ------------------------------------ |
---|
[2187] | 172 | |
---|
| 173 | DO jj = 1, jpj |
---|
| 174 | DO ji = 1, jpi |
---|
[2188] | 175 | IF( ABS(rab(ji,jj)) < 1 ) THEN ! day duration is less than 24h |
---|
| 176 | ! |
---|
| 177 | IF( rdawn(ji,jj) < rdusk(ji,jj) ) THEN ! day time in one part |
---|
| 178 | zlousd = MAX(zlo, rdawn(ji,jj)) |
---|
| 179 | zlousd = MIN(zlousd, zup) |
---|
| 180 | zupusd = MIN(zup, rdusk(ji,jj)) |
---|
| 181 | zupusd = MAX(zupusd, zlo) |
---|
| 182 | ztmp = fintegral(zlousd, zupusd, raa(ji,jj), rbb(ji,jj), rcc(ji,jj)) |
---|
[2210] | 183 | zqsrout(ji,jj) = pqsrin(ji,jj) * ztmp * rscal(ji,jj) |
---|
[2188] | 184 | ! |
---|
| 185 | ELSE ! day time in two parts |
---|
| 186 | zlousd = MIN(zlo, rdusk(ji,jj)) |
---|
| 187 | zupusd = MIN(zup, rdusk(ji,jj)) |
---|
| 188 | ztmp1 = fintegral(zlousd, zupusd, raa(ji,jj), rbb(ji,jj), rcc(ji,jj)) |
---|
| 189 | zlousd = MAX(zlo, rdawn(ji,jj)) |
---|
| 190 | zupusd = MAX(zup, rdawn(ji,jj)) |
---|
| 191 | ztmp2 = fintegral(zlousd, zupusd, raa(ji,jj), rbb(ji,jj), rcc(ji,jj)) |
---|
| 192 | ztmp = ztmp1 + ztmp2 |
---|
[2210] | 193 | zqsrout(ji,jj) = pqsrin(ji,jj) * ztmp * rscal(ji,jj) |
---|
[2188] | 194 | ENDIF |
---|
| 195 | ELSE ! 24h light or 24h night |
---|
| 196 | ! |
---|
[2210] | 197 | IF( raa(ji,jj) > rbb(ji,jj) ) THEN ! 24h day |
---|
[2188] | 198 | ztmp = fintegral(zlo, zup, raa(ji,jj), rbb(ji,jj), rcc(ji,jj)) |
---|
[2210] | 199 | zqsrout(ji,jj) = pqsrin(ji,jj) * ztmp * rscal(ji,jj) |
---|
[2188] | 200 | ! |
---|
| 201 | ELSE ! No day |
---|
[2210] | 202 | zqsrout(ji,jj) = 0.e0 |
---|
[2188] | 203 | ENDIF |
---|
[2187] | 204 | ENDIF |
---|
| 205 | END DO |
---|
| 206 | END DO |
---|
[2188] | 207 | ! |
---|
[2210] | 208 | END FUNCTION sbc_dcy |
---|
[2187] | 209 | |
---|
| 210 | !!====================================================================== |
---|
| 211 | END MODULE sbcdcy |
---|