| 1 |
Initialization (myTime .EQ. startTime in MITgcm) |
| 2 |
|
| 3 |
===> Ocean Sends/ Ice Receives (fields that are sent only once) |
| 4 |
deltatimestep 1 Real*8 TimeIntervalTag |
| 5 |
grid dimensions (Nx,Ny) 2 Integer OceanGridsizeTag |
| 6 |
|
| 7 |
xC Nx*Ny Real*8 xCtag |
| 8 |
yC Nx*Ny Real*8 yCtag |
| 9 |
xG Nx*Ny Real*8 xGtag |
| 10 |
yG Nx*Ny Real*8 yGtag |
| 11 |
dxG Nx*Ny Real*8 dxGtag |
| 12 |
dyG Nx*Ny Real*8 dxGtag |
| 13 |
AngleCS Nx*Ny Real*8 aCStag |
| 14 |
AngleSN Nx*Ny Real*8 aSNtag |
| 15 |
hFacC Nx*Ny Real*8 hFacCtag |
| 16 |
ice area Nx*Ny Real*8 AreaTag |
| 17 |
ice thickness Nx*Ny Real*8 HeffTag |
| 18 |
ice salinity Nx*Ny Real*8 HsaltTag |
| 19 |
snow thickness Nx*Ny Real*8 HsnowTag |
| 20 |
|
| 21 |
===================================== |
| 22 |
|
| 23 |
Each deltatimestep: |
| 24 |
|
| 25 |
===> Ocean Sends/Ice Receives |
| 26 |
ocean model time 1 Real*8 OceanTimeTag |
| 27 |
boundary ice area 2*(Nx+Ny)-4 Real*8 AreaBcTag |
| 28 |
boundary ice thickness 2*(Nx+Ny)-4 Real*8 HeffBcTag |
| 29 |
boundary ice salinity 2*(Nx+Ny)-4 Real*8 HsaltBcTag |
| 30 |
boundary snow thickness 2*(Nx+Ny)-4 Real*8 HsnowBcTag |
| 31 |
boundary u ice 2*(Nx+Ny)-6 Real*8 UiceBcTag |
| 32 |
boundary v ice 2*(Nx+Ny)-6 Real*8 ViceBcTag |
| 33 |
u-wind velocity Nx*Ny Real*8 UwindTag |
| 34 |
v-wind velocity Nx*Ny Real*8 VwindTag |
| 35 |
downward longwave radiation Nx*Ny Real*8 LwDownTag |
| 36 |
downward shortwave radiation Nx*Ny Real*8 SwDownTag |
| 37 |
air temperature Nx*Ny Real*8 AtempTag |
| 38 |
humidity Nx*Ny Real*8 AqhTag |
| 39 |
precipitation Nx*Ny Real*8 PrecipTag |
| 40 |
ocean surface temperature Nx*Ny Real*8 SstTag |
| 41 |
ocean surface salinity Nx*Ny Real*8 SssTag |
| 42 |
surface u current Nx*Ny Real*8 UvelTag |
| 43 |
surface v current Nx*Ny Real*8 VvelTag |
| 44 |
|
| 45 |
===> Ice Sends/Ocean Receives |
| 46 |
ice model time 1 Real*8 IceTimeTag |
| 47 |
ice area Nx*Ny Real*8 AreaTag |
| 48 |
ice thickness Nx*Ny Real*8 HeffTag |
| 49 |
ice salinity Nx*Ny Real*8 HsaltTag |
| 50 |
snow thickness Nx*Ny Real*8 HsnowTag |
| 51 |
u ice velocity Nx*Ny Real*8 UiceTag |
| 52 |
v ice velocity Nx*Ny Real*8 ViceTag |
| 53 |
u surface stress Nx*Ny Real*8 UstressTag |
| 54 |
v surface stress Nx*Ny Real*8 VstressTag |
| 55 |
residual shortwave Nx*Ny Real*8 SwResidTag |
| 56 |
heat flux Nx*Ny Real*8 HeatFluxTag |
| 57 |
freshwater flux Nx*Ny Real*8 WaterFluxTag |
| 58 |
salt flux Nx*Ny Real*8 SaltFluxTag |
| 59 |
|
| 60 |
===================================== |
| 61 |
|
| 62 |
DETAILS: |
| 63 |
|
| 64 |
|
| 65 |
|
| 66 |
1. start and initialize ocean + ice codes |
| 67 |
|
| 68 |
=========================================================== |
| 69 |
|
| 70 |
2. ocean sends |
| 71 |
|
| 72 |
**** initial time step only ******************************* |
| 73 |
|
| 74 |
deltatimestep 1 Real*8 TimeIntervalTag |
| 75 |
|
| 76 |
grid dimensions (Nx,Ny) 2 Integer OceanGridsizeTag |
| 77 |
|
| 78 |
Some grid information - see MITgcm/model/inc/GRID.h for details: |
| 79 |
xC :: longitude East of center of grid cell |
| 80 |
yC ::latitude North of center of grid cell |
| 81 |
xG :: longitude East of SouthWest corner |
| 82 |
yG :: latitude North of SouthWest corner |
| 83 |
dxG :: distance in m between SouthWest and SouthEast corner |
| 84 |
dyG :: distance in m between SouthWest and NorthEast corner |
| 85 |
|
| 86 |
aCS :: cosine(alpha) relative to geographic direction at grid cell center |
| 87 |
aSN :: sine(alpha) relative to geographic direction at grid cell center |
| 88 |
|
| 89 |
alpha = angle of model uVel direction vs geographical East |
| 90 |
= angle of model vVel direction vs geographical North |
| 91 |
(AngleCS*uVelc - AngleSN*vVelc, AngleSN*uVelc + AngleCN*vVelc) |
| 92 |
rotates model velocity to geographical coordinates, where |
| 93 |
(uVelc,vVelc) is model velocity vector at center of grid cell |
| 94 |
|
| 95 |
Then on tracer grid: |
| 96 |
|
| 97 |
hFacC :: landmask of center of grid cell, 0 is land, >0 is ocean |
| 98 |
|
| 99 |
initial ice area (fractional: 0-1) at the tracer points |
| 100 |
C AREA - fractional ice-covered area in m^2/m^2 |
| 101 |
C at center of grid, i.e., tracer point |
| 102 |
C 0 is no cover, 1 is 100% cover |
| 103 |
|
| 104 |
initial ice thickness (mean thickness in the grid box in m) |
| 105 |
actual thickness for single-class ice would be thickness/area |
| 106 |
at the tracer points |
| 107 |
C HEFF - effective ice thickness in m |
| 108 |
C at center of grid, i.e., tracer point |
| 109 |
C note: for non-zero AREA, actual ice |
| 110 |
C thickness is HEFF / AREA |
| 111 |
|
| 112 |
initial ice salinity at the tracer points |
| 113 |
C HSALT - effective sea ice salinity in g/m^2 |
| 114 |
C at center of grid, i.e., tracer point |
| 115 |
|
| 116 |
initial snow thickness (mean thickness, m) at the tracer points |
| 117 |
C HSNOW - effective snow thickness in m |
| 118 |
C at center of grid, i.e., tracer point |
| 119 |
C note: for non-zero AREA, actual snow |
| 120 |
C thickness is HSNOW / AREA |
| 121 |
|
| 122 |
**** every time step ************************************** |
| 123 |
|
| 124 |
ocean model time "myTime" (s) |
| 125 |
|
| 126 |
boundary ice area 2*(Nx+Ny)-4 Real*8 AreaBcTag |
| 127 |
|
| 128 |
boundary ice thickness 2*(Nx+Ny)-4 Real*8 HeffBcTag |
| 129 |
|
| 130 |
boundary ice salinity 2*(Nx+Ny)-4 Real*8 HsaltBcTag |
| 131 |
|
| 132 |
boundary snow thickness 2*(Nx+Ny)-4 Real*8 HsnowBcTag |
| 133 |
|
| 134 |
open boundary u-ice velocity |
| 135 |
specified at the inside edge of the outer grid cells |
| 136 |
southwest C-grid locations for normal component and at the |
| 137 |
southwest C-grid locations for tangential |
| 138 |
C UICE - zonal ice velocity in m/s at South-West C-grid U point |
| 139 |
C >0 from West to East |
| 140 |
|
| 141 |
open boundary v-ice velocity |
| 142 |
specified at the inside edge of the outer grid cells |
| 143 |
southwest C-grid locations for normal component and at the |
| 144 |
southwest C-grid locations for tangential |
| 145 |
C VICE - meridional ice velocity in m/s at South-West C-grid V point |
| 146 |
C >0 from South to North |
| 147 |
|
| 148 |
10-m u-wind at the tracer points |
| 149 |
c uwind :: Surface (10-m) zonal wind velocity in m/s |
| 150 |
c > 0 for increase in uVel, which is west to |
| 151 |
c east for cartesian and spherical polar grids |
| 152 |
c Typical range: -10 < uwind < 10 |
| 153 |
c Input or input/output field |
| 154 |
|
| 155 |
10-m v-wind at the tracer points |
| 156 |
c vwind :: Surface (10-m) meridional wind velocity in m/s |
| 157 |
c > 0 for increase in vVel, which is south to |
| 158 |
c north for cartesian and spherical polar grids |
| 159 |
c Typical range: -10 < vwind < 10 |
| 160 |
c Input or input/output field |
| 161 |
|
| 162 |
downward longwave at the tracer points |
| 163 |
c lwdown :: Downward longwave radiation in W/m^2 |
| 164 |
c > 0 for increase in theta (ocean warming) |
| 165 |
c Typical range: 50 < lwdown < 450 |
| 166 |
c Input/output field |
| 167 |
|
| 168 |
downward shortwave at the tracer points |
| 169 |
c swdown :: Downward shortwave radiation in W/m^2 |
| 170 |
c > 0 for increase in theta (ocean warming) |
| 171 |
c Typical range: 0 < swdown < 450 |
| 172 |
c Input/output field |
| 173 |
|
| 174 |
2-m air temperature at the tracer points |
| 175 |
c atemp :: Surface (2-m) air temperature in deg K |
| 176 |
c Typical range: 200 < atemp < 300 |
| 177 |
c Input or input/output field |
| 178 |
|
| 179 |
2-m humidity at the tracer points |
| 180 |
c aqh :: Surface (2m) specific humidity in kg/kg |
| 181 |
c Typical range: 0 < aqh < 0.02 |
| 182 |
c Input or input/output field |
| 183 |
|
| 184 |
precipitation at the tracer points |
| 185 |
c precip :: Precipitation in m/s |
| 186 |
c > 0 for decrease in salt (ocean salinity) |
| 187 |
c Typical range: 0 < precip < 5e-7 |
| 188 |
c Input or input/output field |
| 189 |
|
| 190 |
sea surface temperature at the tracer points |
| 191 |
C theta - potential temperature (oC, held at pressure/tracer point) |
| 192 |
|
| 193 |
sea surface u-vel |
| 194 |
C uVel - zonal velocity (m/s, i=1 held at western face) |
| 195 |
at southwest c-grid locations |
| 196 |
|
| 197 |
sea surface v-vel |
| 198 |
C vVel - meridional velocity (m/s, j=1 held at southern face) |
| 199 |
at southwest c-grid locations |
| 200 |
|
| 201 |
=========================================================== |
| 202 |
|
| 203 |
3. ice receives 2., computes initial ice conditions and sends on tracer grid |
| 204 |
|
| 205 |
ice model time (s) |
| 206 |
|
| 207 |
ice area at tracer point |
| 208 |
C AREA :: fractional ice-covered area in m^2/m^2 |
| 209 |
C at center of grid, i.e., tracer point |
| 210 |
C 0 is no cover, 1 is 100% cover |
| 211 |
|
| 212 |
ice thickness at tracer point |
| 213 |
C HEFF :: effective ice thickness in m |
| 214 |
C at center of grid, i.e., tracer point |
| 215 |
C note: for non-zero AREA, |
| 216 |
C actual ice thickness is HEFF / AREA |
| 217 |
|
| 218 |
ice salinity at tracer point |
| 219 |
C HSALT :: effective sea ice salinity in g/m^2 |
| 220 |
C at center of grid, i.e., tracer point |
| 221 |
|
| 222 |
snow thickness at tracer point |
| 223 |
C HSNOW :: effective snow thickness in m |
| 224 |
C at center of grid, i.e., tracer point |
| 225 |
C note: for non-zero AREA, actual snow thickness is HSNOW / AREA |
| 226 |
|
| 227 |
u ice velocity at southwest c-grid locations |
| 228 |
C UICE - zonal ice velocity in m/s at South-West C-grid U point |
| 229 |
C >0 from West to East |
| 230 |
|
| 231 |
v ice velocity at southwest c-grid locations |
| 232 |
C VICE - meridional ice velocity in m/s at South-West C-grid V point |
| 233 |
C >0 from South to North |
| 234 |
|
| 235 |
u-stress under ice at southwest c-grid locations |
| 236 |
C fu :: Zonal surface wind stress in N/m^2 |
| 237 |
C > 0 for increase in uVel, which is west to |
| 238 |
C east for cartesian and spherical polar grids |
| 239 |
C Typical range: -0.5 < fu < 0.5 |
| 240 |
C Southwest C-grid U point |
| 241 |
|
| 242 |
v-stress under ice at southwest c-grid locations |
| 243 |
C fv :: Meridional surface wind stress in N/m^2 |
| 244 |
C > 0 for increase in vVel, which is south to |
| 245 |
C north for cartesian and spherical polar grids |
| 246 |
C Typical range: -0.5 < fv < 0.5 |
| 247 |
C Southwest C-grid V point |
| 248 |
|
| 249 |
residual shortwave under ice at tracer point |
| 250 |
C Qsw :: Net upward shortwave radiation in W/m^2 |
| 251 |
C Qsw = - ( downward - ice and snow absorption - reflected ) |
| 252 |
C > 0 for decrease in theta (ocean cooling) |
| 253 |
C Typical range: -350 < Qsw < 0 |
| 254 |
C Southwest C-grid tracer point |
| 255 |
|
| 256 |
heat flux (less shortwave) at tracer point |
| 257 |
C HeatFlux |
| 258 |
C :: Upward surface heat flux (excluding shortwave) in W/m^2 |
| 259 |
C HeatFlux = latent + sensible + net longwave |
| 260 |
C > 0 for decrease in theta (ocean cooling) |
| 261 |
C Typical range: -250 < HeatFlux < 950 |
| 262 |
C Southwest C-grid tracer point |
| 263 |
|
| 264 |
freshwater flux at tracer point |
| 265 |
C EmPmR :: Net upward freshwater flux in kg/m2/s |
| 266 |
C EmPmR = Evaporation - precipitation - runoff |
| 267 |
C > 0 for increase in salt (ocean salinity) |
| 268 |
C Typical range: -1e-4 < EmPmR < 1e-4 |
| 269 |
C Southwest C-grid tracer point |
| 270 |
C NOTE: for backward compatibility EmPmRfile is specified in |
| 271 |
C m/s when using external_fields_load.F. It is converted |
| 272 |
C to kg/m2/s by multiplying by rhoConstFresh. |
| 273 |
|
| 274 |
salt flux at tracer point |
| 275 |
C saltFlux :: Net upward salt flux in psu.kg/m^2/s |
| 276 |
C flux of Salt taken out of the ocean per time unit (second). |
| 277 |
C Note: a) only used when salty sea-ice forms or melts. |
| 278 |
C b) units: when salinity (unit= psu) is expressed |
| 279 |
C in g/kg, saltFlux unit becomes g/m^2/s. |
| 280 |
C > 0 for decrease in SSS. |
| 281 |
C Southwest C-grid tracer point |
| 282 |
|
| 283 |
=========================================================== |
| 284 |
|
| 285 |
4a. ice model steps forward by deltatimestep |
| 286 |
initially hardwired to 20 minutes |
| 287 |
|
| 288 |
4b. ocean model receives 3. and steps forward by deltatimestep |
| 289 |
initially hardwired to 20 minutes |
| 290 |
|
| 291 |
=========================================================== |
| 292 |
|
| 293 |
5a. ocean sends on tracer grid |
| 294 |
timestep |
| 295 |
open boundary ice area at tracer point |
| 296 |
open boundary ice thickness at tracer point |
| 297 |
open boundary snow thickness at tracer point |
| 298 |
open boundary ice salinity at tracer point |
| 299 |
open boundary u-ice velocity (see 2.) |
| 300 |
open boundary v-ice velocity (see 2.) |
| 301 |
10-m u-wind (see 2.) |
| 302 |
10-m v-wind (see 2.) |
| 303 |
downward longwave (see 2.) |
| 304 |
downward shortwave (see 2.) |
| 305 |
2-m air temperature (see 2.) |
| 306 |
2-m humidity (see 2.) |
| 307 |
precipitation (see 2.) |
| 308 |
sea surface temperature (see 2.) |
| 309 |
sea surface u-vel (see 2.) |
| 310 |
sea surface v-vel (see 2.) |
| 311 |
|
| 312 |
=========================================================== |
| 313 |
|
| 314 |
5b. ice sends on tracer grid |
| 315 |
|
| 316 |
ice model time (s) |
| 317 |
ice area at tracer point |
| 318 |
ice thickness at tracer point |
| 319 |
ice salinity at tracer point |
| 320 |
snow thickness at tracer point |
| 321 |
u-stress under ice at southwest b-grid locations |
| 322 |
v-stress under ice at southwest b-grid locations |
| 323 |
residual shortwave under ice at tracer point |
| 324 |
heat flux (less shortwave) at tracer point |
| 325 |
freshwater flux at tracer point |
| 326 |
salt flux at tracer point |
| 327 |
|
| 328 |
=========================================================== |
| 329 |
|
| 330 |
6a. ocean model receives 5b. and steps forward by deltatimestep |
| 331 |
initially hardwired to 20 minutes |
| 332 |
|
| 333 |
6b. ice model receives 5a. steps forward by deltatimestep |
| 334 |
initially hardwired to 20 minutes |
| 335 |
|
| 336 |
=========================================================== |
| 337 |
|
| 338 |
LOOP to 5a. and 5b. |
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