| 1 |
dimitri |
1.1 |
Initialization (myTime .EQ. startTime in MITgcm) |
| 2 |
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| 3 |
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===> Ocean Sends/ Ice Receives (fields that are sent only once) |
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deltatimestep 1 Real*8 TimeIntervalTag |
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grid dimensions (Nx,Ny) 2 Integer OceanGridsizeTag |
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dimitri |
1.5 |
xG Nx*Ny Real*8 xGtag |
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yG Nx*Ny Real*8 yGtag |
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dxG Nx*Ny Real*8 dxGtag |
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dyG Nx*Ny Real*8 dxGtag |
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hFacC Nx*Ny Real*8 hFacCtag |
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dimitri |
1.1 |
ice area Nx*Ny Real*8 AreaTag |
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ice thickness Nx*Ny Real*8 HeffTag |
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ice salinity Nx*Ny Real*8 HsaltTag |
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snow thickness Nx*Ny Real*8 HsnowTag |
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===================================== |
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Each deltatimestep: |
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===> Ocean Sends/Ice Receives |
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ocean model time 1 Real*8 OceanTimeTag |
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boundary ice area 2*(Nx+Ny)-4 Real*8 AreaBcTag |
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boundary ice thickness 2*(Nx+Ny)-4 Real*8 HeffBcTag |
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boundary ice salinity 2*(Nx+Ny)-4 Real*8 HsaltBcTag |
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boundary snow thickness 2*(Nx+Ny)-4 Real*8 HsnowBcTag |
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boundary u ice 2*(Nx+Ny)-6 Real*8 UiceBcTag |
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boundary v ice 2*(Nx+Ny)-6 Real*8 ViceBcTag |
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u-wind velocity Nx*Ny Real*8 UwindTag |
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v-wind velocity Nx*Ny Real*8 VwindTag |
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downward longwave radiation Nx*Ny Real*8 LwDownTag |
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downward shortwave radiation Nx*Ny Real*8 SwDownTag |
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air temperature Nx*Ny Real*8 AtempTag |
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humidity Nx*Ny Real*8 AqhTag |
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precipitation Nx*Ny Real*8 PrecipTag |
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ocean surface temperature Nx*Ny Real*8 SstTag |
| 36 |
dimitri |
1.3 |
ocean surface salinity Nx*Ny Real*8 SssTag |
| 37 |
dimitri |
1.1 |
surface u current Nx*Ny Real*8 UvelTag |
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surface v current Nx*Ny Real*8 VvelTag |
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| 40 |
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===> Ice Sends/Ocean Receives |
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ice model time 1 Real*8 IceTimeTag |
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ice area Nx*Ny Real*8 AreaTag |
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ice thickness Nx*Ny Real*8 HeffTag |
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ice salinity Nx*Ny Real*8 HsaltTag |
| 45 |
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snow thickness Nx*Ny Real*8 HsnowTag |
| 46 |
dimitri |
1.4 |
u ice velocity Nx*Ny Real*8 UiceTag |
| 47 |
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v ice velocity Nx*Ny Real*8 ViceTag |
| 48 |
dimitri |
1.1 |
u surface stress Nx*Ny Real*8 UstressTag |
| 49 |
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v surface stress Nx*Ny Real*8 VstressTag |
| 50 |
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residual shortwave Nx*Ny Real*8 SwResidTag |
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heat flux Nx*Ny Real*8 HeatFluxTag |
| 52 |
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freshwater flux Nx*Ny Real*8 WaterFluxTag |
| 53 |
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salt flux Nx*Ny Real*8 SaltFluxTag |
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===================================== |
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DETAILS: |
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| 61 |
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1. start and initialize ocean + ice codes |
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| 63 |
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=========================================================== |
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| 65 |
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2. ocean sends |
| 66 |
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| 67 |
dimitri |
1.2 |
**** initial time step only ******************************* |
| 68 |
dimitri |
1.1 |
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| 69 |
dimitri |
1.2 |
deltatimestep 1 Real*8 TimeIntervalTag |
| 70 |
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| 71 |
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grid dimensions (Nx,Ny) 2 Integer OceanGridsizeTag |
| 72 |
dimitri |
1.1 |
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| 73 |
dimitri |
1.5 |
Some grid information - see MITgcm/model/inc/GRID.h for details: |
| 74 |
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xG :: longitude East of SouthWest corner |
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yG :: latitude North of SouthWest corner |
| 76 |
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dxG :: distance in m between SouthWest and SouthEast corner |
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dyG :: distance in m between SouthWest and NorthEast corner |
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| 79 |
dimitri |
1.1 |
Then on tracer grid: |
| 80 |
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| 81 |
dimitri |
1.5 |
hFacC :: landmask of center of grid cell, 0 is land, >0 is ocean |
| 82 |
dimitri |
1.1 |
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| 83 |
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initial ice area (fractional: 0-1) at the tracer points |
| 84 |
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C AREA - fractional ice-covered area in m^2/m^2 |
| 85 |
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C at center of grid, i.e., tracer point |
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C 0 is no cover, 1 is 100% cover |
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| 88 |
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initial ice thickness (mean thickness in the grid box in m) |
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actual thickness for single-class ice would be thickness/area |
| 90 |
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at the tracer points |
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C HEFF - effective ice thickness in m |
| 92 |
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C at center of grid, i.e., tracer point |
| 93 |
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C note: for non-zero AREA, actual ice |
| 94 |
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C thickness is HEFF / AREA |
| 95 |
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| 96 |
dimitri |
1.2 |
initial ice salinity at the tracer points |
| 97 |
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C HSALT - effective sea ice salinity in g/m^2 |
| 98 |
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C at center of grid, i.e., tracer point |
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| 100 |
dimitri |
1.1 |
initial snow thickness (mean thickness, m) at the tracer points |
| 101 |
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C HSNOW - effective snow thickness in m |
| 102 |
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C at center of grid, i.e., tracer point |
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C note: for non-zero AREA, actual snow |
| 104 |
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C thickness is HSNOW / AREA |
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| 106 |
dimitri |
1.2 |
**** every time step ************************************** |
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ocean model time "myTime" (s) |
| 109 |
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| 110 |
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boundary ice area 2*(Nx+Ny)-4 Real*8 AreaBcTag |
| 111 |
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| 112 |
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boundary ice thickness 2*(Nx+Ny)-4 Real*8 HeffBcTag |
| 113 |
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| 114 |
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boundary ice salinity 2*(Nx+Ny)-4 Real*8 HsaltBcTag |
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boundary snow thickness 2*(Nx+Ny)-4 Real*8 HsnowBcTag |
| 117 |
dimitri |
1.1 |
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open boundary u-ice velocity |
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specified at the inside edge of the outer grid cells |
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southwest C-grid locations for normal component and at the |
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southwest C-grid locations for tangential |
| 122 |
dimitri |
1.4 |
C UICE - zonal ice velocity in m/s at South-West C-grid U point |
| 123 |
dimitri |
1.1 |
C >0 from West to East |
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open boundary v-ice velocity |
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specified at the inside edge of the outer grid cells |
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southwest C-grid locations for normal component and at the |
| 128 |
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southwest C-grid locations for tangential |
| 129 |
dimitri |
1.4 |
C VICE - meridional ice velocity in m/s at South-West C-grid V point |
| 130 |
dimitri |
1.1 |
C >0 from South to North |
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10-m u-wind at the tracer points |
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c uwind :: Surface (10-m) zonal wind velocity in m/s |
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c > 0 for increase in uVel, which is west to |
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c east for cartesian and spherical polar grids |
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c Typical range: -10 < uwind < 10 |
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c Input or input/output field |
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10-m v-wind at the tracer points |
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c vwind :: Surface (10-m) meridional wind velocity in m/s |
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c > 0 for increase in vVel, which is south to |
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c north for cartesian and spherical polar grids |
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c Typical range: -10 < vwind < 10 |
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c Input or input/output field |
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downward longwave at the tracer points |
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c lwdown :: Downward longwave radiation in W/m^2 |
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c > 0 for increase in theta (ocean warming) |
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c Typical range: 50 < lwdown < 450 |
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c Input/output field |
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downward shortwave at the tracer points |
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c swdown :: Downward shortwave radiation in W/m^2 |
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c > 0 for increase in theta (ocean warming) |
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c Typical range: 0 < swdown < 450 |
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c Input/output field |
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2-m air temperature at the tracer points |
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c atemp :: Surface (2-m) air temperature in deg K |
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c Typical range: 200 < atemp < 300 |
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c Input or input/output field |
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2-m humidity at the tracer points |
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c aqh :: Surface (2m) specific humidity in kg/kg |
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c Typical range: 0 < aqh < 0.02 |
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c Input or input/output field |
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precipitation at the tracer points |
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c precip :: Precipitation in m/s |
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c > 0 for decrease in salt (ocean salinity) |
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c Typical range: 0 < precip < 5e-7 |
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c Input or input/output field |
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sea surface temperature at the tracer points |
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C theta - potential temperature (oC, held at pressure/tracer point) |
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sea surface u-vel |
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C uVel - zonal velocity (m/s, i=1 held at western face) |
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at southwest c-grid locations |
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sea surface v-vel |
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C vVel - meridional velocity (m/s, j=1 held at southern face) |
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at southwest c-grid locations |
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=========================================================== |
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3. ice receives 2., computes initial ice conditions and sends on tracer grid |
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ice model time (s) |
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dimitri |
1.3 |
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dimitri |
1.1 |
ice area at tracer point |
| 192 |
dimitri |
1.3 |
C AREA :: fractional ice-covered area in m^2/m^2 |
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C at center of grid, i.e., tracer point |
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C 0 is no cover, 1 is 100% cover |
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| 196 |
dimitri |
1.1 |
ice thickness at tracer point |
| 197 |
dimitri |
1.3 |
C HEFF :: effective ice thickness in m |
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C at center of grid, i.e., tracer point |
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C note: for non-zero AREA, |
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C actual ice thickness is HEFF / AREA |
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dimitri |
1.1 |
ice salinity at tracer point |
| 203 |
dimitri |
1.3 |
C HSALT :: effective sea ice salinity in g/m^2 |
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C at center of grid, i.e., tracer point |
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dimitri |
1.1 |
snow thickness at tracer point |
| 207 |
dimitri |
1.3 |
C HSNOW :: effective snow thickness in m |
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C at center of grid, i.e., tracer point |
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C note: for non-zero AREA, actual snow thickness is HSNOW / AREA |
| 210 |
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| 211 |
dimitri |
1.4 |
u ice velocity at southwest c-grid locations |
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C UICE - zonal ice velocity in m/s at South-West C-grid U point |
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C >0 from West to East |
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v ice velocity at southwest c-grid locations |
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C VICE - meridional ice velocity in m/s at South-West C-grid V point |
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C >0 from South to North |
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dimitri |
1.3 |
u-stress under ice at southwest c-grid locations |
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C fu :: Zonal surface wind stress in N/m^2 |
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C > 0 for increase in uVel, which is west to |
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C east for cartesian and spherical polar grids |
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C Typical range: -0.5 < fu < 0.5 |
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C Southwest C-grid U point |
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v-stress under ice at southwest c-grid locations |
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C fv :: Meridional surface wind stress in N/m^2 |
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C > 0 for increase in vVel, which is south to |
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C north for cartesian and spherical polar grids |
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C Typical range: -0.5 < fv < 0.5 |
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C Southwest C-grid V point |
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| 233 |
dimitri |
1.1 |
residual shortwave under ice at tracer point |
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dimitri |
1.3 |
C Qsw :: Net upward shortwave radiation in W/m^2 |
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C Qsw = - ( downward - ice and snow absorption - reflected ) |
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C > 0 for decrease in theta (ocean cooling) |
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C Typical range: -350 < Qsw < 0 |
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C Southwest C-grid tracer point |
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dimitri |
1.1 |
heat flux (less shortwave) at tracer point |
| 241 |
dimitri |
1.6 |
C HeatFlux |
| 242 |
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C :: Upward surface heat flux (excluding shortwave) in W/m^2 |
| 243 |
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C HeatFlux = latent + sensible + net longwave |
| 244 |
dimitri |
1.3 |
C > 0 for decrease in theta (ocean cooling) |
| 245 |
dimitri |
1.6 |
C Typical range: 100 < Qnet < 950 |
| 246 |
dimitri |
1.3 |
C Southwest C-grid tracer point |
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| 248 |
dimitri |
1.1 |
freshwater flux at tracer point |
| 249 |
dimitri |
1.3 |
C EmPmR :: Net upward freshwater flux in kg/m2/s |
| 250 |
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C EmPmR = Evaporation - precipitation - runoff |
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C > 0 for increase in salt (ocean salinity) |
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C Typical range: -1e-4 < EmPmR < 1e-4 |
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C Southwest C-grid tracer point |
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C NOTE: for backward compatibility EmPmRfile is specified in |
| 255 |
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C m/s when using external_fields_load.F. It is converted |
| 256 |
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C to kg/m2/s by multiplying by rhoConstFresh. |
| 257 |
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| 258 |
dimitri |
1.1 |
salt flux at tracer point |
| 259 |
dimitri |
1.3 |
C saltFlux :: Net upward salt flux in psu.kg/m^2/s |
| 260 |
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C flux of Salt taken out of the ocean per time unit (second). |
| 261 |
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C Note: a) only used when salty sea-ice forms or melts. |
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C b) units: when salinity (unit= psu) is expressed |
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C in g/kg, saltFlux unit becomes g/m^2/s. |
| 264 |
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C > 0 for decrease in SSS. |
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C Southwest C-grid tracer point |
| 266 |
dimitri |
1.1 |
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| 267 |
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=========================================================== |
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4a. ice model steps forward by deltatimestep |
| 270 |
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initially hardwired to 20 minutes |
| 271 |
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| 272 |
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4b. ocean model receives 3. and steps forward by deltatimestep |
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initially hardwired to 20 minutes |
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=========================================================== |
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5a. ocean sends on tracer grid |
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timestep |
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open boundary ice area at tracer point |
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open boundary ice thickness at tracer point |
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open boundary snow thickness at tracer point |
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open boundary ice salinity at tracer point |
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open boundary u-ice velocity (see 2.) |
| 284 |
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open boundary v-ice velocity (see 2.) |
| 285 |
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10-m u-wind (see 2.) |
| 286 |
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10-m v-wind (see 2.) |
| 287 |
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downward longwave (see 2.) |
| 288 |
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downward shortwave (see 2.) |
| 289 |
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2-m air temperature (see 2.) |
| 290 |
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2-m humidity (see 2.) |
| 291 |
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precipitation (see 2.) |
| 292 |
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sea surface temperature (see 2.) |
| 293 |
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sea surface u-vel (see 2.) |
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sea surface v-vel (see 2.) |
| 295 |
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=========================================================== |
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5b. ice sends on tracer grid |
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ice model time (s) |
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ice area at tracer point |
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ice thickness at tracer point |
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ice salinity at tracer point |
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snow thickness at tracer point |
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u-stress under ice at southwest b-grid locations |
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v-stress under ice at southwest b-grid locations |
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residual shortwave under ice at tracer point |
| 308 |
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heat flux (less shortwave) at tracer point |
| 309 |
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freshwater flux at tracer point |
| 310 |
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salt flux at tracer point |
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=========================================================== |
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6a. ocean model receives 5b. and steps forward by deltatimestep |
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initially hardwired to 20 minutes |
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6b. ice model receives 5a. steps forward by deltatimestep |
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initially hardwired to 20 minutes |
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=========================================================== |
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LOOP to 5a. and 5b. |
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