| 1 | ! |
|---|
| 2 | MODULE surf_landice_mod |
|---|
| 3 | |
|---|
| 4 | IMPLICIT NONE |
|---|
| 5 | |
|---|
| 6 | CONTAINS |
|---|
| 7 | ! |
|---|
| 8 | !**************************************************************************************** |
|---|
| 9 | ! |
|---|
| 10 | SUBROUTINE surf_landice(itime, dtime, knon, knindex, & |
|---|
| 11 | rlon, rlat, debut, lafin, & |
|---|
| 12 | rmu0, lwdownm, albedo, pphi1, & |
|---|
| 13 | swnet, lwnet, tsurf, p1lay, & |
|---|
| 14 | cdragh, cdragm, precip_rain, precip_snow, precip_bs, temp_air, spechum, & |
|---|
| 15 | AcoefH, AcoefQ, BcoefH, BcoefQ, & |
|---|
| 16 | AcoefU, AcoefV, BcoefU, BcoefV, & |
|---|
| 17 | AcoefQBS, BcoefQBS, & |
|---|
| 18 | ps, u1, v1, gustiness, rugoro, pctsrf, & |
|---|
| 19 | snow, qsurf, qsol, qbs1, agesno, & |
|---|
| 20 | tsoil, z0m, z0h, SFRWL, alb_dir, alb_dif, evap, fluxsens, fluxlat, fluxbs, & |
|---|
| 21 | tsurf_new, dflux_s, dflux_l, & |
|---|
| 22 | alt, slope, cloudf, & |
|---|
| 23 | snowhgt, qsnow, to_ice, sissnow, & |
|---|
| 24 | alb3, runoff, & |
|---|
| 25 | flux_u1, flux_v1) |
|---|
| 26 | |
|---|
| 27 | USE dimphy |
|---|
| 28 | USE geometry_mod, ONLY : longitude,latitude |
|---|
| 29 | USE surface_data, ONLY : type_ocean, calice, calsno, landice_opt, iflag_albcalc |
|---|
| 30 | USE fonte_neige_mod, ONLY : fonte_neige,run_off_lic,fqcalving_global,ffonte_global,fqfonte_global,runofflic_global |
|---|
| 31 | USE cpl_mod, ONLY : cpl_send_landice_fields |
|---|
| 32 | USE calcul_fluxs_mod |
|---|
| 33 | USE phys_local_var_mod, ONLY : zxrhoslic, zxustartlic, zxqsaltlic |
|---|
| 34 | USE phys_output_var_mod, ONLY : snow_o,zfra_o |
|---|
| 35 | !FC |
|---|
| 36 | USE ioipsl_getin_p_mod, ONLY : getin_p |
|---|
| 37 | USE lmdz_blowing_snow_ini, ONLY : c_esalt_bs, zeta_bs, pbst_bs, prt_bs, rhoice_bs, rhohard_bs |
|---|
| 38 | USE lmdz_blowing_snow_ini, ONLY : rhofresh_bs, tau_eqsalt_bs, tau_dens0_bs, tau_densmin_bs |
|---|
| 39 | #ifdef CPP_INLANDSIS |
|---|
| 40 | USE surf_inlandsis_mod, ONLY : surf_inlandsis |
|---|
| 41 | #endif |
|---|
| 42 | |
|---|
| 43 | USE indice_sol_mod |
|---|
| 44 | |
|---|
| 45 | ! INCLUDE "indicesol.h" |
|---|
| 46 | INCLUDE "dimsoil.h" |
|---|
| 47 | INCLUDE "YOMCST.h" |
|---|
| 48 | INCLUDE "clesphys.h" |
|---|
| 49 | |
|---|
| 50 | ! Input variables |
|---|
| 51 | !**************************************************************************************** |
|---|
| 52 | INTEGER, INTENT(IN) :: itime, knon |
|---|
| 53 | INTEGER, DIMENSION(klon), INTENT(in) :: knindex |
|---|
| 54 | REAL, INTENT(in) :: dtime |
|---|
| 55 | REAL, DIMENSION(klon), INTENT(IN) :: swnet ! net shortwave radiance |
|---|
| 56 | REAL, DIMENSION(klon), INTENT(IN) :: lwnet ! net longwave radiance |
|---|
| 57 | REAL, DIMENSION(klon), INTENT(IN) :: tsurf |
|---|
| 58 | REAL, DIMENSION(klon), INTENT(IN) :: p1lay |
|---|
| 59 | REAL, DIMENSION(klon), INTENT(IN) :: cdragh, cdragm |
|---|
| 60 | REAL, DIMENSION(klon), INTENT(IN) :: precip_rain, precip_snow, precip_bs |
|---|
| 61 | REAL, DIMENSION(klon), INTENT(IN) :: temp_air, spechum |
|---|
| 62 | REAL, DIMENSION(klon), INTENT(IN) :: AcoefH, AcoefQ |
|---|
| 63 | REAL, DIMENSION(klon), INTENT(IN) :: BcoefH, BcoefQ |
|---|
| 64 | REAL, DIMENSION(klon), INTENT(IN) :: AcoefU, AcoefV, BcoefU, BcoefV |
|---|
| 65 | REAL, DIMENSION(klon), INTENT(IN) :: AcoefQBS, BcoefQBS |
|---|
| 66 | REAL, DIMENSION(klon), INTENT(IN) :: ps |
|---|
| 67 | REAL, DIMENSION(klon), INTENT(IN) :: u1, v1, gustiness, qbs1 |
|---|
| 68 | REAL, DIMENSION(klon), INTENT(IN) :: rugoro |
|---|
| 69 | REAL, DIMENSION(klon,nbsrf), INTENT(IN) :: pctsrf |
|---|
| 70 | |
|---|
| 71 | LOGICAL, INTENT(IN) :: debut !true if first step |
|---|
| 72 | LOGICAL, INTENT(IN) :: lafin !true if last step |
|---|
| 73 | REAL, DIMENSION(klon), INTENT(IN) :: rlon, rlat |
|---|
| 74 | REAL, DIMENSION(klon), INTENT(IN) :: rmu0 |
|---|
| 75 | REAL, DIMENSION(klon), INTENT(IN) :: lwdownm !ylwdown |
|---|
| 76 | REAL, DIMENSION(klon), INTENT(IN) :: albedo !mean albedo |
|---|
| 77 | REAL, DIMENSION(klon), INTENT(IN) :: pphi1 |
|---|
| 78 | REAL, DIMENSION(klon), INTENT(IN) :: alt !mean altitude of the grid box |
|---|
| 79 | REAL, DIMENSION(klon), INTENT(IN) :: slope !mean slope in grid box |
|---|
| 80 | REAL, DIMENSION(klon), INTENT(IN) :: cloudf !total cloud fraction |
|---|
| 81 | |
|---|
| 82 | ! In/Output variables |
|---|
| 83 | !**************************************************************************************** |
|---|
| 84 | REAL, DIMENSION(klon), INTENT(INOUT) :: snow, qsol |
|---|
| 85 | REAL, DIMENSION(klon), INTENT(INOUT) :: agesno |
|---|
| 86 | REAL, DIMENSION(klon, nsoilmx), INTENT(INOUT) :: tsoil |
|---|
| 87 | |
|---|
| 88 | ! Output variables |
|---|
| 89 | !**************************************************************************************** |
|---|
| 90 | REAL, DIMENSION(klon), INTENT(OUT) :: qsurf |
|---|
| 91 | REAL, DIMENSION(klon), INTENT(OUT) :: z0m, z0h |
|---|
| 92 | !albedo SB >>> |
|---|
| 93 | ! REAL, DIMENSION(klon), INTENT(OUT) :: alb1 ! new albedo in visible SW interval |
|---|
| 94 | ! REAL, DIMENSION(klon), INTENT(OUT) :: alb2 ! new albedo in near IR interval |
|---|
| 95 | REAL, DIMENSION(6), INTENT(IN) :: SFRWL |
|---|
| 96 | REAL, DIMENSION(klon,nsw), INTENT(OUT) :: alb_dir,alb_dif |
|---|
| 97 | !albedo SB <<< |
|---|
| 98 | REAL, DIMENSION(klon), INTENT(OUT) :: evap, fluxsens, fluxlat |
|---|
| 99 | REAL, DIMENSION(klon), INTENT(OUT) :: fluxbs |
|---|
| 100 | REAL, DIMENSION(klon), INTENT(OUT) :: tsurf_new |
|---|
| 101 | REAL, DIMENSION(klon), INTENT(OUT) :: dflux_s, dflux_l |
|---|
| 102 | REAL, DIMENSION(klon), INTENT(OUT) :: flux_u1, flux_v1 |
|---|
| 103 | |
|---|
| 104 | REAL, DIMENSION(klon), INTENT(OUT) :: alb3 |
|---|
| 105 | REAL, DIMENSION(klon), INTENT(OUT) :: qsnow !column water in snow [kg/m2] |
|---|
| 106 | REAL, DIMENSION(klon), INTENT(OUT) :: snowhgt !Snow height (m) |
|---|
| 107 | REAL, DIMENSION(klon), INTENT(OUT) :: to_ice |
|---|
| 108 | REAL, DIMENSION(klon), INTENT(OUT) :: sissnow |
|---|
| 109 | REAL, DIMENSION(klon), INTENT(OUT) :: runoff !Land ice runoff |
|---|
| 110 | |
|---|
| 111 | |
|---|
| 112 | ! Local variables |
|---|
| 113 | !**************************************************************************************** |
|---|
| 114 | REAL, DIMENSION(klon) :: soilcap, soilflux |
|---|
| 115 | REAL, DIMENSION(klon) :: cal, beta, dif_grnd |
|---|
| 116 | REAL, DIMENSION(klon) :: zfra, alb_neig |
|---|
| 117 | REAL, DIMENSION(klon) :: radsol |
|---|
| 118 | REAL, DIMENSION(klon) :: u0, v0, u1_lay, v1_lay, ustar |
|---|
| 119 | INTEGER :: i,j,nt |
|---|
| 120 | REAL, DIMENSION(klon) :: fqfonte,ffonte |
|---|
| 121 | REAL, DIMENSION(klon) :: run_off_lic_frac |
|---|
| 122 | REAL, DIMENSION(klon) :: emis_new !Emissivity |
|---|
| 123 | REAL, DIMENSION(klon) :: swdown,lwdown |
|---|
| 124 | REAL, DIMENSION(klon) :: precip_snow_adv, snow_adv !Snow Drift precip./advection (not used in inlandsis) |
|---|
| 125 | REAL, DIMENSION(klon) :: erod !erosion of surface snow (flux, kg/m2/s like evap) |
|---|
| 126 | REAL, DIMENSION(klon) :: zsl_height, wind_velo !surface layer height, wind spd |
|---|
| 127 | REAL, DIMENSION(klon) :: dens_air, snow_cont_air !air density; snow content air |
|---|
| 128 | REAL, DIMENSION(klon) :: alb_soil !albedo of underlying ice |
|---|
| 129 | REAL, DIMENSION(klon) :: pexner !Exner potential |
|---|
| 130 | REAL :: pref |
|---|
| 131 | REAL, DIMENSION(klon,nsoilmx) :: tsoil0 !modif |
|---|
| 132 | REAL :: dtis ! subtimestep |
|---|
| 133 | LOGICAL :: debut_is, lafin_is ! debut and lafin for inlandsis |
|---|
| 134 | |
|---|
| 135 | CHARACTER (len = 20) :: modname = 'surf_landice' |
|---|
| 136 | CHARACTER (len = 80) :: abort_message |
|---|
| 137 | |
|---|
| 138 | |
|---|
| 139 | REAL,DIMENSION(klon) :: alb1,alb2 |
|---|
| 140 | REAL,DIMENSION(klon) :: precip_totsnow, evap_totsnow |
|---|
| 141 | REAL, DIMENSION (klon,6) :: alb6 |
|---|
| 142 | REAL :: esalt |
|---|
| 143 | REAL :: lambdasalt,fluxsalt, csalt, nunu, aa, bb, cc |
|---|
| 144 | REAL :: tau_dens, maxerosion |
|---|
| 145 | REAL, DIMENSION(klon) :: ws1, rhod, rhos, ustart0, ustart, qsalt, hsalt |
|---|
| 146 | REAL, DIMENSION(klon) :: fluxbs_1, fluxbs_2, bsweight_fresh |
|---|
| 147 | LOGICAL, DIMENSION(klon) :: ok_remaining_freshsnow |
|---|
| 148 | REAL :: ta1, ta2, ta3, z01, z02, z03, coefa, coefb, coefc, coefd |
|---|
| 149 | |
|---|
| 150 | |
|---|
| 151 | ! End definition |
|---|
| 152 | !**************************************************************************************** |
|---|
| 153 | !FC |
|---|
| 154 | !FC |
|---|
| 155 | REAL,SAVE :: alb_vis_sno_lic |
|---|
| 156 | !$OMP THREADPRIVATE(alb_vis_sno_lic) |
|---|
| 157 | REAL,SAVE :: alb_nir_sno_lic |
|---|
| 158 | !$OMP THREADPRIVATE(alb_nir_sno_lic) |
|---|
| 159 | LOGICAL, SAVE :: firstcall = .TRUE. |
|---|
| 160 | !$OMP THREADPRIVATE(firstcall) |
|---|
| 161 | |
|---|
| 162 | |
|---|
| 163 | !FC firtscall initializations |
|---|
| 164 | !****************************************************************************************** |
|---|
| 165 | IF (firstcall) THEN |
|---|
| 166 | alb_vis_sno_lic=0.77 |
|---|
| 167 | CALL getin_p('alb_vis_sno_lic',alb_vis_sno_lic) |
|---|
| 168 | PRINT*, 'alb_vis_sno_lic',alb_vis_sno_lic |
|---|
| 169 | alb_nir_sno_lic=0.77 |
|---|
| 170 | CALL getin_p('alb_nir_sno_lic',alb_nir_sno_lic) |
|---|
| 171 | PRINT*, 'alb_nir_sno_lic',alb_nir_sno_lic |
|---|
| 172 | |
|---|
| 173 | firstcall=.false. |
|---|
| 174 | ENDIF |
|---|
| 175 | !****************************************************************************************** |
|---|
| 176 | |
|---|
| 177 | ! Initialize output variables |
|---|
| 178 | alb3(:) = 999999. |
|---|
| 179 | alb2(:) = 999999. |
|---|
| 180 | alb1(:) = 999999. |
|---|
| 181 | fluxbs(:)=0. |
|---|
| 182 | runoff(:) = 0. |
|---|
| 183 | !**************************************************************************************** |
|---|
| 184 | ! Calculate total absorbed radiance at surface |
|---|
| 185 | ! |
|---|
| 186 | !**************************************************************************************** |
|---|
| 187 | radsol(:) = 0.0 |
|---|
| 188 | radsol(1:knon) = swnet(1:knon) + lwnet(1:knon) |
|---|
| 189 | |
|---|
| 190 | !**************************************************************************************** |
|---|
| 191 | |
|---|
| 192 | !**************************************************************************************** |
|---|
| 193 | ! landice_opt = 0 : soil_model, calcul_flux, fonte_neige, ... |
|---|
| 194 | ! landice_opt = 1 : prepare and call INterace Lmdz SISvat (INLANDSIS) |
|---|
| 195 | !**************************************************************************************** |
|---|
| 196 | |
|---|
| 197 | |
|---|
| 198 | IF (landice_opt .EQ. 1) THEN |
|---|
| 199 | |
|---|
| 200 | !**************************************************************************************** |
|---|
| 201 | ! CALL to INLANDSIS interface |
|---|
| 202 | !**************************************************************************************** |
|---|
| 203 | #ifdef CPP_INLANDSIS |
|---|
| 204 | |
|---|
| 205 | debut_is=debut |
|---|
| 206 | lafin_is=.false. |
|---|
| 207 | ! Suppose zero surface speed |
|---|
| 208 | u0(:) = 0.0 |
|---|
| 209 | v0(:) = 0.0 |
|---|
| 210 | |
|---|
| 211 | |
|---|
| 212 | CALL calcul_flux_wind(knon, dtime, & |
|---|
| 213 | u0, v0, u1, v1, gustiness, cdragm, & |
|---|
| 214 | AcoefU, AcoefV, BcoefU, BcoefV, & |
|---|
| 215 | p1lay, temp_air, & |
|---|
| 216 | flux_u1, flux_v1) |
|---|
| 217 | |
|---|
| 218 | |
|---|
| 219 | ! Set constants and compute some input for SISVAT |
|---|
| 220 | ! = 1000 hPa |
|---|
| 221 | ! and calculate incoming flux for SW and LW interval: swdown, lwdown |
|---|
| 222 | swdown(:) = 0.0 |
|---|
| 223 | lwdown(:) = 0.0 |
|---|
| 224 | snow_cont_air(:) = 0. ! the snow content in air is not a prognostic variable of the model |
|---|
| 225 | alb_soil(:) = 0.4 ! before albedo(:) but here it is the ice albedo that we have to set |
|---|
| 226 | ustar(:) = 0. |
|---|
| 227 | pref = 100000. |
|---|
| 228 | DO i = 1, knon |
|---|
| 229 | swdown(i) = swnet(i)/(1-albedo(i)) |
|---|
| 230 | lwdown(i) = lwdownm(i) |
|---|
| 231 | wind_velo(i) = u1(i)**2 + v1(i)**2 |
|---|
| 232 | wind_velo(i) = wind_velo(i)**0.5 |
|---|
| 233 | pexner(i) = (p1lay(i)/pref)**(RD/RCPD) |
|---|
| 234 | dens_air(i) = p1lay(i)/RD/temp_air(i) ! dry air density |
|---|
| 235 | zsl_height(i) = pphi1(i)/RG |
|---|
| 236 | tsoil0(i,:) = tsoil(i,:) |
|---|
| 237 | ustar(i)= (cdragm(i)*(wind_velo(i)**2))**0.5 |
|---|
| 238 | END DO |
|---|
| 239 | |
|---|
| 240 | |
|---|
| 241 | |
|---|
| 242 | dtis=dtime |
|---|
| 243 | |
|---|
| 244 | IF (lafin) THEN |
|---|
| 245 | lafin_is=.true. |
|---|
| 246 | END IF |
|---|
| 247 | |
|---|
| 248 | CALL surf_inlandsis(knon, rlon, rlat, knindex, itime, dtis, debut_is, lafin_is,& |
|---|
| 249 | rmu0, swdown, lwdown, albedo, pexner, ps, p1lay, precip_rain, precip_snow, & |
|---|
| 250 | zsl_height, wind_velo, ustar, temp_air, dens_air, spechum, tsurf,& |
|---|
| 251 | rugoro, snow_cont_air, alb_soil, alt, slope, cloudf, & |
|---|
| 252 | radsol, qsol, tsoil0, snow, zfra, snowhgt, qsnow, to_ice, sissnow,agesno, & |
|---|
| 253 | AcoefH, AcoefQ, BcoefH, BcoefQ, cdragm, cdragh, & |
|---|
| 254 | run_off_lic, fqfonte, ffonte, evap, erod, fluxsens, fluxlat,dflux_s, dflux_l, & |
|---|
| 255 | tsurf_new, alb1, alb2, alb3, alb6, & |
|---|
| 256 | emis_new, z0m, z0h, qsurf) |
|---|
| 257 | |
|---|
| 258 | debut_is=.false. |
|---|
| 259 | |
|---|
| 260 | |
|---|
| 261 | ! Treatment of snow melting and calving |
|---|
| 262 | |
|---|
| 263 | ! for consistency with standard LMDZ, add calving to run_off_lic |
|---|
| 264 | run_off_lic(:)=run_off_lic(:) + to_ice(:) |
|---|
| 265 | |
|---|
| 266 | DO i = 1, knon |
|---|
| 267 | ffonte_global(knindex(i),is_lic) = ffonte(i) |
|---|
| 268 | fqfonte_global(knindex(i),is_lic) = fqfonte(i)! net melting= melting - refreezing |
|---|
| 269 | fqcalving_global(knindex(i),is_lic) = to_ice(i) ! flux |
|---|
| 270 | runofflic_global(knindex(i)) = run_off_lic(i) |
|---|
| 271 | ENDDO |
|---|
| 272 | ! Here, we assume that the calving term is equal to the to_ice term |
|---|
| 273 | ! (no ice accumulation) |
|---|
| 274 | |
|---|
| 275 | |
|---|
| 276 | #else |
|---|
| 277 | abort_message='Pb de coherence: landice_opt = 1 mais CPP_INLANDSIS = .false.' |
|---|
| 278 | CALL abort_physic(modname,abort_message,1) |
|---|
| 279 | #endif |
|---|
| 280 | |
|---|
| 281 | |
|---|
| 282 | ELSE |
|---|
| 283 | |
|---|
| 284 | !**************************************************************************************** |
|---|
| 285 | ! Soil calculations |
|---|
| 286 | ! |
|---|
| 287 | !**************************************************************************************** |
|---|
| 288 | |
|---|
| 289 | ! EV: use calbeta |
|---|
| 290 | CALL calbeta(dtime, is_lic, knon, snow, qsol, beta, cal, dif_grnd) |
|---|
| 291 | |
|---|
| 292 | |
|---|
| 293 | ! use soil model and recalculate properly cal |
|---|
| 294 | IF (soil_model) THEN |
|---|
| 295 | CALL soil(dtime, is_lic, knon, snow, tsurf, qsol, & |
|---|
| 296 | & longitude(knindex(1:knon)), latitude(knindex(1:knon)), tsoil, soilcap, soilflux) |
|---|
| 297 | cal(1:knon) = RCPD / soilcap(1:knon) |
|---|
| 298 | radsol(1:knon) = radsol(1:knon) + soilflux(1:knon) |
|---|
| 299 | ELSE |
|---|
| 300 | cal = RCPD * calice |
|---|
| 301 | WHERE (snow > 0.0) cal = RCPD * calsno |
|---|
| 302 | ENDIF |
|---|
| 303 | |
|---|
| 304 | |
|---|
| 305 | !**************************************************************************************** |
|---|
| 306 | ! Calulate fluxes |
|---|
| 307 | ! |
|---|
| 308 | !**************************************************************************************** |
|---|
| 309 | ! beta(:) = 1.0 |
|---|
| 310 | ! dif_grnd(:) = 0.0 |
|---|
| 311 | |
|---|
| 312 | ! Suppose zero surface speed |
|---|
| 313 | u0(:)=0.0 |
|---|
| 314 | v0(:)=0.0 |
|---|
| 315 | u1_lay(:) = u1(:) - u0(:) |
|---|
| 316 | v1_lay(:) = v1(:) - v0(:) |
|---|
| 317 | |
|---|
| 318 | CALL calcul_fluxs(knon, is_lic, dtime, & |
|---|
| 319 | tsurf, p1lay, cal, beta, cdragh, cdragh, ps, & |
|---|
| 320 | precip_rain, precip_snow, snow, qsurf, & |
|---|
| 321 | radsol, dif_grnd, temp_air, spechum, u1_lay, v1_lay, gustiness, & |
|---|
| 322 | 1.,AcoefH, AcoefQ, BcoefH, BcoefQ, & |
|---|
| 323 | tsurf_new, evap, fluxlat, fluxsens, dflux_s, dflux_l) |
|---|
| 324 | |
|---|
| 325 | CALL calcul_flux_wind(knon, dtime, & |
|---|
| 326 | u0, v0, u1, v1, gustiness, cdragm, & |
|---|
| 327 | AcoefU, AcoefV, BcoefU, BcoefV, & |
|---|
| 328 | p1lay, temp_air, & |
|---|
| 329 | flux_u1, flux_v1) |
|---|
| 330 | |
|---|
| 331 | |
|---|
| 332 | !**************************************************************************************** |
|---|
| 333 | ! Calculate albedo |
|---|
| 334 | ! |
|---|
| 335 | !**************************************************************************************** |
|---|
| 336 | |
|---|
| 337 | ! |
|---|
| 338 | !IM: plusieurs choix/tests sur l'albedo des "glaciers continentaux" |
|---|
| 339 | ! alb1(1 : knon) = 0.6 !IM cf FH/GK |
|---|
| 340 | ! alb1(1 : knon) = 0.82 |
|---|
| 341 | ! alb1(1 : knon) = 0.77 !211003 Ksta0.77 |
|---|
| 342 | ! alb1(1 : knon) = 0.8 !KstaTER0.8 & LMD_ARMIP5 |
|---|
| 343 | !IM: KstaTER0.77 & LMD_ARMIP6 |
|---|
| 344 | |
|---|
| 345 | ! Attantion: alb1 and alb2 are not the same! |
|---|
| 346 | alb1(1:knon) = alb_vis_sno_lic |
|---|
| 347 | alb2(1:knon) = alb_nir_sno_lic |
|---|
| 348 | |
|---|
| 349 | |
|---|
| 350 | !**************************************************************************************** |
|---|
| 351 | ! Rugosity |
|---|
| 352 | ! |
|---|
| 353 | !**************************************************************************************** |
|---|
| 354 | |
|---|
| 355 | if (z0m_landice .GT. 0.) then |
|---|
| 356 | z0m(1:knon) = z0m_landice |
|---|
| 357 | z0h(1:knon) = z0h_landice |
|---|
| 358 | else |
|---|
| 359 | ! parameterization of z0=f(T) following measurements in Adelie Land by Amory et al 2018 |
|---|
| 360 | coefa = 0.1658 !0.1862 !Ant |
|---|
| 361 | coefb = -50.3869 !-55.7718 !Ant |
|---|
| 362 | ta1 = 253.15 !255. Ant |
|---|
| 363 | ta2 = 273.15 |
|---|
| 364 | ta3 = 273.15+3 |
|---|
| 365 | z01 = exp(coefa*ta1 + coefb) !~0.2 ! ~0.25 mm |
|---|
| 366 | z02 = exp(coefa*ta2 + coefb) !~6 !~7 mm |
|---|
| 367 | z03 = z01 |
|---|
| 368 | coefc = log(z03/z02)/(ta3-ta2) |
|---|
| 369 | coefd = log(z03)-coefc*ta3 |
|---|
| 370 | do j=1,knon |
|---|
| 371 | if (temp_air(j) .lt. ta1) then |
|---|
| 372 | z0m(j) = z01 |
|---|
| 373 | else if (temp_air(j).ge.ta1 .and. temp_air(j).lt.ta2) then |
|---|
| 374 | z0m(j) = exp(coefa*temp_air(j) + coefb) |
|---|
| 375 | else if (temp_air(j).ge.ta2 .and. temp_air(j).lt.ta3) then |
|---|
| 376 | ! if st > 0, melting induce smooth surface |
|---|
| 377 | z0m(j) = exp(coefc*temp_air(j) + coefd) |
|---|
| 378 | else |
|---|
| 379 | z0m(j) = z03 |
|---|
| 380 | endif |
|---|
| 381 | z0h(j)=z0m(j) |
|---|
| 382 | enddo |
|---|
| 383 | |
|---|
| 384 | endif |
|---|
| 385 | |
|---|
| 386 | |
|---|
| 387 | !**************************************************************************************** |
|---|
| 388 | ! Simple blowing snow param |
|---|
| 389 | !**************************************************************************************** |
|---|
| 390 | ! we proceed in 2 steps: |
|---|
| 391 | ! first we erode - if possible -the accumulated snow during the time step |
|---|
| 392 | ! then we update the density of the underlying layer and see if we can also erode |
|---|
| 393 | ! this layer |
|---|
| 394 | |
|---|
| 395 | |
|---|
| 396 | if (ok_bs) then |
|---|
| 397 | fluxbs(:)=0. |
|---|
| 398 | do j=1,knon |
|---|
| 399 | ws1(j)=(u1(j)**2+v1(j)**2)**0.5 |
|---|
| 400 | ustar(j)=(cdragm(j)*(u1(j)**2+v1(j)**2))**0.5 |
|---|
| 401 | rhod(j)=p1lay(j)/RD/temp_air(j) |
|---|
| 402 | ustart0(j) =(log(2.868)-log(1.625))/0.085*sqrt(cdragm(j)) |
|---|
| 403 | enddo |
|---|
| 404 | |
|---|
| 405 | ! 1st step: erosion of fresh snow accumulated during the time step |
|---|
| 406 | do j=1, knon |
|---|
| 407 | if (precip_snow(j) .GT. 0.) then |
|---|
| 408 | rhos(j)=rhofresh_bs |
|---|
| 409 | ! blowing snow flux formula used in MAR |
|---|
| 410 | ustart(j)=ustart0(j)*exp(max(rhoice_bs/rhofresh_bs-rhoice_bs/rhos(j),0.))*exp(max(0.,rhos(j)-rhohard_bs)) |
|---|
| 411 | ! we have multiplied by exp to prevent erosion when rhos>rhohard_bs |
|---|
| 412 | ! computation of qbs at the top of the saltation layer |
|---|
| 413 | ! default formulation from MAR model (Amory et al. 2021, Gallee et al. 2001) |
|---|
| 414 | esalt=1./(c_esalt_bs*max(1.e-6,ustar(j))) |
|---|
| 415 | hsalt(j)=0.08436*(max(1.e-6,ustar(j))**1.27) |
|---|
| 416 | qsalt(j)=(max(ustar(j)**2-ustart(j)**2,0.))/(RG*hsalt(j))*esalt |
|---|
| 417 | ! calculation of erosion (flux positive towards the surface here) |
|---|
| 418 | ! consistent with implicit resolution of turbulent mixing equation |
|---|
| 419 | ! Nemoto and Nishimura 2004 show that steady-state saltation is achieved within a time tau_eqsalt_bs of about 10s |
|---|
| 420 | ! we thus prevent snowerosion (snow particle transfer from the saltation layer to the first model level) |
|---|
| 421 | ! integrated over tau_eqsalt_bs to exceed the total mass of snow particle in the saltation layer |
|---|
| 422 | ! (rho*qsalt*hsalt) |
|---|
| 423 | ! during this first step we also lower bound the erosion to the amount of fresh snow accumulated during the time step |
|---|
| 424 | maxerosion=min(precip_snow(j),hsalt(j)*qsalt(j)*rhod(j)/tau_eqsalt_bs) |
|---|
| 425 | |
|---|
| 426 | fluxbs_1(j)=rhod(j)*ws1(j)*cdragh(j)*zeta_bs*(AcoefQBS(j)-qsalt(j)) & |
|---|
| 427 | / (1.-rhod(j)*ws1(j)*cdragh(j)*zeta_bs*BcoefQBS(j)*dtime) |
|---|
| 428 | fluxbs_1(j)=max(-maxerosion,fluxbs_1(j)) |
|---|
| 429 | |
|---|
| 430 | if (precip_snow(j) .gt. abs(fluxbs_1(j))) then |
|---|
| 431 | ok_remaining_freshsnow(j)=.true. |
|---|
| 432 | bsweight_fresh(j)=1. |
|---|
| 433 | else |
|---|
| 434 | ok_remaining_freshsnow(j)=.false. |
|---|
| 435 | bsweight_fresh(j)=exp(-(abs(fluxbs_1(j))-precip_snow(j))/precip_snow(j)) |
|---|
| 436 | endif |
|---|
| 437 | else |
|---|
| 438 | ok_remaining_freshsnow(j)=.false. |
|---|
| 439 | fluxbs_1(j)=0. |
|---|
| 440 | bsweight_fresh(j)=0. |
|---|
| 441 | endif |
|---|
| 442 | enddo |
|---|
| 443 | |
|---|
| 444 | |
|---|
| 445 | ! we now compute the snow age of the overlying layer (snow surface after erosion of the fresh snow accumulated during the time step) |
|---|
| 446 | ! this is done through the routine albsno |
|---|
| 447 | CALL albsno(klon,knon,dtime,agesno(:),alb_neig(:), precip_snow(:)+fluxbs_1(:)) |
|---|
| 448 | |
|---|
| 449 | ! 2nd step: |
|---|
| 450 | ! computation of threshold friction velocity |
|---|
| 451 | ! which depends on surface snow density |
|---|
| 452 | do j = 1, knon |
|---|
| 453 | if (ok_remaining_freshsnow(j)) then |
|---|
| 454 | fluxbs_2(j)=0. |
|---|
| 455 | else |
|---|
| 456 | ! we start eroding the underlying layer |
|---|
| 457 | ! estimation of snow density |
|---|
| 458 | ! snow density increases with snow age and |
|---|
| 459 | ! increases even faster in case of sedimentation of blowing snow or rain |
|---|
| 460 | tau_dens=max(tau_densmin_bs, tau_dens0_bs*exp(-abs(precip_bs(j))/pbst_bs - & |
|---|
| 461 | abs(precip_rain(j))/prt_bs)*exp(-max(tsurf(j)-RTT,0.))) |
|---|
| 462 | rhos(j)=rhofresh_bs+(rhohard_bs-rhofresh_bs)*(1.-exp(-agesno(j)*86400.0/tau_dens)) |
|---|
| 463 | ! blowing snow flux formula used in MAR |
|---|
| 464 | ustart(j)=ustart0(j)*exp(max(rhoice_bs/rhofresh_bs-rhoice_bs/rhos(j),0.))*exp(max(0.,rhos(j)-rhohard_bs)) |
|---|
| 465 | ! we have multiplied by exp to prevent erosion when rhos>rhohard_bs |
|---|
| 466 | ! computation of qbs at the top of the saltation layer |
|---|
| 467 | ! default formulation from MAR model (Amory et al. 2021, Gallee et al. 2001) |
|---|
| 468 | esalt=1./(c_esalt_bs*max(1.e-6,ustar(j))) |
|---|
| 469 | hsalt(j)=0.08436*(max(1.e-6,ustar(j))**1.27) |
|---|
| 470 | qsalt(j)=(max(ustar(j)**2-ustart(j)**2,0.))/(RG*hsalt(j))*esalt |
|---|
| 471 | ! calculation of erosion (flux positive towards the surface here) |
|---|
| 472 | ! consistent with implicit resolution of turbulent mixing equation |
|---|
| 473 | ! Nemoto and Nishimura 2004 show that steady-state saltation is achieved within a time tau_eqsalt_bs of about 10s |
|---|
| 474 | ! we thus prevent snowerosion (snow particle transfer from the saltation layer to the first model level) |
|---|
| 475 | ! integrated over tau_eqsalt_bs to exceed the total mass of snow particle in the saltation layer |
|---|
| 476 | ! (rho*qsalt*hsalt) |
|---|
| 477 | maxerosion=hsalt(j)*qsalt(j)*rhod(j)/tau_eqsalt_bs |
|---|
| 478 | fluxbs_2(j)=rhod(j)*ws1(j)*cdragh(j)*zeta_bs*(AcoefQBS(j)-qsalt(j)) & |
|---|
| 479 | / (1.-rhod(j)*ws1(j)*cdragh(j)*zeta_bs*BcoefQBS(j)*dtime) |
|---|
| 480 | fluxbs_2(j)=max(-maxerosion,fluxbs_2(j)) |
|---|
| 481 | endif |
|---|
| 482 | enddo |
|---|
| 483 | |
|---|
| 484 | |
|---|
| 485 | |
|---|
| 486 | |
|---|
| 487 | ! final flux and outputs |
|---|
| 488 | do j=1, knon |
|---|
| 489 | ! total flux is the erosion of fresh snow + |
|---|
| 490 | ! a fraction of the underlying snow (if all the fresh snow has been eroded) |
|---|
| 491 | ! the calculation of the fraction is quite delicate since we do not know |
|---|
| 492 | ! how much time was needed to erode the fresh snow. We assume that this time |
|---|
| 493 | ! is dt*exp(-(abs(fluxbs1)-precipsnow)/precipsnow)=dt*bsweight_fresh |
|---|
| 494 | |
|---|
| 495 | fluxbs(j)=fluxbs_1(j)+fluxbs_2(j)*(1.-bsweight_fresh(j)) |
|---|
| 496 | i = knindex(j) |
|---|
| 497 | zxustartlic(i) = ustart(j) |
|---|
| 498 | zxrhoslic(i) = rhos(j) |
|---|
| 499 | zxqsaltlic(i)=qsalt(j) |
|---|
| 500 | enddo |
|---|
| 501 | |
|---|
| 502 | |
|---|
| 503 | else ! not ok_bs |
|---|
| 504 | ! those lines are useful to calculate the snow age |
|---|
| 505 | CALL albsno(klon,knon,dtime,agesno(:),alb_neig(:), precip_snow(:)) |
|---|
| 506 | |
|---|
| 507 | endif ! if ok_bs |
|---|
| 508 | |
|---|
| 509 | |
|---|
| 510 | |
|---|
| 511 | !**************************************************************************************** |
|---|
| 512 | ! Calculate snow amount |
|---|
| 513 | ! |
|---|
| 514 | !**************************************************************************************** |
|---|
| 515 | IF (ok_bs) THEN |
|---|
| 516 | precip_totsnow(:)=precip_snow(:)+precip_bs(:) |
|---|
| 517 | evap_totsnow(:)=evap(:)-fluxbs(:) ! flux bs is positive towards the surface (snow erosion) |
|---|
| 518 | ELSE |
|---|
| 519 | precip_totsnow(:)=precip_snow(:) |
|---|
| 520 | evap_totsnow(:)=evap(:) |
|---|
| 521 | ENDIF |
|---|
| 522 | |
|---|
| 523 | |
|---|
| 524 | CALL fonte_neige(knon, is_lic, knindex, dtime, & |
|---|
| 525 | tsurf, precip_rain, precip_totsnow, & |
|---|
| 526 | snow, qsol, tsurf_new, evap_totsnow) |
|---|
| 527 | |
|---|
| 528 | |
|---|
| 529 | WHERE (snow(1 : knon) .LT. 0.0001) agesno(1 : knon) = 0. |
|---|
| 530 | zfra(1:knon) = MAX(0.0,MIN(1.0,snow(1:knon)/(snow(1:knon)+10.0))) |
|---|
| 531 | |
|---|
| 532 | |
|---|
| 533 | END IF ! landice_opt |
|---|
| 534 | |
|---|
| 535 | |
|---|
| 536 | !**************************************************************************************** |
|---|
| 537 | ! Send run-off on land-ice to coupler if coupled ocean. |
|---|
| 538 | ! run_off_lic has been calculated in fonte_neige or surf_inlandsis |
|---|
| 539 | ! If landice_opt>=2, corresponding call is done from surf_land_orchidee |
|---|
| 540 | !**************************************************************************************** |
|---|
| 541 | IF (type_ocean=='couple' .AND. landice_opt .LT. 2) THEN |
|---|
| 542 | ! Compress fraction where run_off_lic is active (here all pctsrf(is_lic)) |
|---|
| 543 | run_off_lic_frac(:)=0.0 |
|---|
| 544 | DO j = 1, knon |
|---|
| 545 | i = knindex(j) |
|---|
| 546 | run_off_lic_frac(j) = pctsrf(i,is_lic) |
|---|
| 547 | ENDDO |
|---|
| 548 | |
|---|
| 549 | CALL cpl_send_landice_fields(itime, knon, knindex, run_off_lic, run_off_lic_frac) |
|---|
| 550 | ENDIF |
|---|
| 551 | |
|---|
| 552 | ! transfer runoff rate [kg/m2/s](!) to physiq for output |
|---|
| 553 | runoff(1:knon)=run_off_lic(1:knon)/dtime |
|---|
| 554 | |
|---|
| 555 | snow_o=0. |
|---|
| 556 | zfra_o = 0. |
|---|
| 557 | DO j = 1, knon |
|---|
| 558 | i = knindex(j) |
|---|
| 559 | snow_o(i) = snow(j) |
|---|
| 560 | zfra_o(i) = zfra(j) |
|---|
| 561 | ENDDO |
|---|
| 562 | |
|---|
| 563 | |
|---|
| 564 | !albedo SB >>> |
|---|
| 565 | select case(NSW) |
|---|
| 566 | case(2) |
|---|
| 567 | alb_dir(1:knon,1)=alb1(1:knon) |
|---|
| 568 | alb_dir(1:knon,2)=alb2(1:knon) |
|---|
| 569 | case(4) |
|---|
| 570 | alb_dir(1:knon,1)=alb1(1:knon) |
|---|
| 571 | alb_dir(1:knon,2)=alb2(1:knon) |
|---|
| 572 | alb_dir(1:knon,3)=alb2(1:knon) |
|---|
| 573 | alb_dir(1:knon,4)=alb2(1:knon) |
|---|
| 574 | case(6) |
|---|
| 575 | alb_dir(1:knon,1)=alb1(1:knon) |
|---|
| 576 | alb_dir(1:knon,2)=alb1(1:knon) |
|---|
| 577 | alb_dir(1:knon,3)=alb1(1:knon) |
|---|
| 578 | alb_dir(1:knon,4)=alb2(1:knon) |
|---|
| 579 | alb_dir(1:knon,5)=alb2(1:knon) |
|---|
| 580 | alb_dir(1:knon,6)=alb2(1:knon) |
|---|
| 581 | |
|---|
| 582 | IF ((landice_opt .EQ. 1) .AND. (iflag_albcalc .EQ. 2)) THEN |
|---|
| 583 | alb_dir(1:knon,1)=alb6(1:knon,1) |
|---|
| 584 | alb_dir(1:knon,2)=alb6(1:knon,2) |
|---|
| 585 | alb_dir(1:knon,3)=alb6(1:knon,3) |
|---|
| 586 | alb_dir(1:knon,4)=alb6(1:knon,4) |
|---|
| 587 | alb_dir(1:knon,5)=alb6(1:knon,5) |
|---|
| 588 | alb_dir(1:knon,6)=alb6(1:knon,6) |
|---|
| 589 | ENDIF |
|---|
| 590 | |
|---|
| 591 | end select |
|---|
| 592 | alb_dif=alb_dir |
|---|
| 593 | !albedo SB <<< |
|---|
| 594 | |
|---|
| 595 | |
|---|
| 596 | END SUBROUTINE surf_landice |
|---|
| 597 | ! |
|---|
| 598 | !**************************************************************************************** |
|---|
| 599 | ! |
|---|
| 600 | END MODULE surf_landice_mod |
|---|
| 601 | |
|---|
| 602 | |
|---|
| 603 | |
|---|
