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<title>CCSM/PCM atm monthly and daily xwalk to CMIP Standard Output</title>
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CCSM/PCM ATM crosswalk to the PCMDI IPCC Standard Output Requirements
<h4 style="color: rgb(0, 0, 0);">Initial draft: LB March 24 2004
Corrections: LB March 25 2004
<span style="color: rgb(255, 0, 0);">Additions/corrections: GS August 13 2004, September 28 2004</span></h4>
Overview
The following tables were extracted from the <a href="http://www-pcmdi.llnl.gov/ipcc/standard_output.html">PCMDI IPCC
standard Output requirements</a> document dated 20 July 2004.
Each table a column listing the CCSM and PCM atmosphere model history variables needed to generate the corresponding PCMDI field.
Monthly mean and time-independent data
| CF Standard name | CAM/CCM3 name | CAM/CCM3 units | CF name | CF units | |
|---|---|---|---|---|---|
| 1 | air_pressure_at_sea_level | PSL | Pa | psl | Pa |
| 2 | precipitation_flux | (PRECC+PRECL)*rH ~2~0 | m s<sup>-1</sup> | pr | kg m<sup>-2</sup> s<sup>-1</sup> |
| 3 | air_temperature<sup>a</sup> | TREFHT | K | tas | K |
| 6 | surface_downward_eastward_stress | TAUX | Pa<sup></sup> | tauu | Pa |
| 7 | surface_downward_northward_stress | TAUY | Pa<sup></sup> | tauv | Pa |
| 8 | surface_snow_thickness | SNOWHLND SNOWHICE |
m | snd | m |
| 9 | surface_upward_latent_heat_flux | (Lv+Lf)*QFLX - Lf10-3 (PRECC+PRECL) |
hfls | W m<sup>-2</sup> | |
| 10 | surface_upward_sensible_heat_flux | SHFLX | W m<sup>-2</sup> | hfss | W m<sup>-2</sup> |
| 11 | surface_downwelling_longwave_flux | 5.67e-8*TS<sup>4</sup>-FLNS | W m<sup>-2</sup> | rlds | W m<sup>-2</sup> |
| 12 | surface_upwelling_longwave_flux | 5.67e-8*TS<sup>4</sup> | W m<sup>-2</sup> | rlus | W m<sup>-2</sup> |
| 13 | surface_downwelling_shortwave_flux | FSDS | W m<sup>-2</sup> | rsds | W m<sup>-2</sup> |
| 14 | surface_upwelling_shortwave_flux | FSDS-FSNS | W m<sup>-2</sup> | rsus | W m<sup>-2</sup> |
| 15 | surface_temperature | TS | K | ts | K |
| 16 | surface_air_pressure | PS | Pa | ps | Pa |
| 17 | snowfall_flux | (PRECSC+PRECSL)*rH ~2~0 | m s<sup>-1</sup> | prsn | kg m<sup>-2</sup> s<sup>-1</sup> |
| 18 | convective_precipitation_flux | PRECC | m s<sup>-1</sup> | prc | kg m<sup>-2</sup> s<sup>-1</sup> |
| 19 | atmosphere_water_vapor_content | TMQ | kg m<sup>-2</sup> | prw | kg m<sup>-2</sup> |
| 28 | specific_humidity<sup>d</sup> | QREFHT | kg kg<sup>-1</sup> | huss | kg kg<sup>-1</sup> |
| 31 | toa_incoming_shortwave_flux | SOLIN | W m<sup>-2</sup> | rsdt | W m<sup>-2</sup> |
| 32 | toa_outgoing_shortwave_flux | SOLIN-FSNTOA | W m<sup>-2</sup> | rsut | W m<sup>-2</sup> |
| 33 | toa_outgoing_longwave_flux | FLUT | W m<sup>-2</sup> | rlut | W m<sup>-2</sup> |
| 34 | net_downward_radiative_flux_at_top_of_atmosphere_model | FSNTOA-FLUT | W m<sup>-2</sup> | rtmt | W m<sup>-2</sup> |
| 35 | surface_downwelling_shortwave_flux_assuming_clear_sky | FSDSC | W m<sup>-2</sup> | rsdscs | W m<sup>-2</sup> |
| 36 | surface_upwelling_shortwave_flux_assuming_clear_sky | FSDSC-FSNSC | W m<sup>-2</sup> | rsuscs | W m<sup>-2</sup> |
| 37 | surface_downwelling_longwave_flux_assuming_clear_sky | SRFRAD-FSNSC | W m<sup>-2</sup> | rldscs | W m<sup>-2</sup> |
| 38 | toa_outgoing_longwave_flux_assuming_clear_sky | FLUTC | W m<sup>-2</sup> | rlutcs | W m<sup>-2</sup> |
| 39 | toa_outgoing_shortwave_flux_assuming_clear_sky | SOLIN-FSNTOAC | W m<sup>-2</sup> | rsutcs | W m<sup>-2</sup> |
| 40 | cloud_area_fraction | CLDTOT | fraction | clt | percent |
| 41 | atmosphere_cloud_condensed_water_content | TGCLDLWP | g m<sup>-2</sup> | clwvi | kg m<sup>-2</sup> |
| 42 | atmosphere_cloud_ice_content | TGCLDIWP | g m<sup>-2</sup> | clivi | kg m<sup>-2</sup> |
<sup>a</sup>Also known as "surface air temperature."
Distinguish from 3-D air temperature by specifying a size-one dimension
of
height with coordinate value 2 m,
or by including the CF-convention
"coordinates" attribute, containing the name of a scalar
coordinate variable for height with the value of 2 m.
<sup>b</sup>In the upper 0.1 m only.
<sup>c</sup>Total for all soil layers.
<sup>d</sup>Near-surface value.
Distinguish from 3-D distribution by specifying a size-one dimension of
height with coordinate value 10 m (for near-surface wind) or 2 m (for
near-surface humidity),
or by including the CF-convention "coordinates" attribute,
containing the name of a scalar coordinate variable for height
with the value of 10 or 2 m.
| CF Standard name | CAM/CCM3 name | CAM/CCM3 units | CF name | CF units | |
|---|---|---|---|---|---|
| 1 | surface_altitude | PHIS/g | m<sup>-2 </sup>s<sup>-2</sup> | orog | m |
| 2 | land_area_fraction | LANDFRAC*100 | fraction | sftlf | percent |
| 3 | land_ice_area_fraction | - | sftgif | percent | |
| 4 | soil_moisture_content_at_field_capacity | - | mrsofc | kg m<sup>-2</sup> |
| CF Standard name | CAM/CCM3 name | CAM/CCM3 units | CF name | CF units | |
|---|---|---|---|---|---|
| 1 | cloud_area_fraction_in_atmosphere_layer | CLOUD | fraction | cl | percent |
| 2 | air_temperature | T | K | ta | K |
| 3 | eastward_wind | U | m s<sup>-1</sup> |
ua | m s<sup>-1</sup> |
| 4 | northward_wind | V | m s<sup>-1</sup> |
va | m s<sup>-1</sup> |
| 5 | specific_humidity | Q | kg kg<sup>-1</sup> |
hus | kg kg<sup>-1</sup> |
| 6 | omega | OMEGA | Pa s<sup>-1</sup> |
wap | Pa s<sup>-1</sup> |
| 7 | geopotential_height | Z3 | m | zg | m |
| 8 | relative_humidity | RELHUM | percent | hur | percent |
| 9 | area_fraction_below_surface<sup>b</sup> | - | psbg | percent | |
| 10 | mole_fraction_of_o3_in_air | 03 | mol mol<sup>-1</sup> |
tro3 | ppbv |
<sup>a</sup>Except for the variable
cloud_area_fraction_in_atmosphere_layer, this data
must be provided on pressure levels. The set of pressure levels must
include at least the AMIP standard pressure levels (= NCEP reanalysis
levels):
1000, 925, 850, 700, 600, 500, 400, 300, 250, 200, 150, 100, 70, 50,
30, 20, 10 hPa.
_<sup>b</sup>_Fraction of the time that a pressure surface lies
below ground.
Daily mean and 3-hourly data
<i>NOTE:
The following daily mean data may be provided for a smaller time period
than the monthly means</i>:
| CF Standard name | CAM/CCM3 name | CAM/CCM3 units | CF name | CF units | |
|---|---|---|---|---|---|
| 1 | air_pressure_at_sea_level | PSL | Pa | psl | Pa |
| 2 | precipitation_flux | (PRECC+PRECL)rH20 | m s<sup>-1</sup> | pr | kg m<sup>-2</sup> s<sup>-1</sup> |
| 3 | air_temperature<sup>a, b</sup> | TREFHTMN | K | tasmin | K |
| 4 | air_temperature<sup>a, c</sup> | TREFHTMX | K | tasmax | K |
| 5 | air_temperature<sup>a</sup> | TREFHT | K |
tas | K |
| 6 | surface_upward_latent_heat_flux | (Lv+Lf)*QFLX - Lf10-3( PRECC+PRECL) |
W m<sup>-2</sup> | hfls | W m<sup>-2</sup> |
| 7 | surface_upward_sensible_heat_flux | SHFLX | W m<sup>-2</sup> | hfss | W m<sup>-2</sup> |
| 8 | surface_downwelling_longwave_flux | 5.67e-8*TS<sup>4</sup>-FLNS | W m<sup>-2</sup> | rlds | W m<sup>-2</sup> |
| 9 | surface_upwelling_longwave_flux | 5.67e-8*TS<sup>4</sup> | W m<sup>-2</sup> | rlus | W m<sup>-2</sup> |
| 10 | surface_downwelling_shortwave_flux | FSDS | W m<sup>-2</sup> | rsds | W m<sup>-2</sup> |
| 11 | surface_upwelling_shortwave_flux | FSDS-FSNS | W m<sup>-2</sup> | rsus | W m<sup>-2</sup> |
| 14 | toa_outgoing_longwave_flux | FLUT | W m<sup>-2</sup> | rlut | W m<sup>-2</sup> |
<sup>a</sup>Also known as "surface air temperature."
Distinguish from 3-D air temperature by specifying a size-one dimension
of
height with coordinate value 2 m,
or by including the CF-convention
"coordinates" attribute, containing the name of a scalar
coordinate variable for height with the value of 2 m.
<sup>b</sup>Daily minimum value. Designate by a cell_methods
attribute specifying "time: minimum within days,"
where "time" is the name of the time dimension.
<sup>c</sup>Daily maximum value.
Designate by a cell_methods attribute specifying "time: maximum within
days,"
where "time" is the name of the time dimension.
<sup>d</sup>Near-surface value.
Distinguish from 3-D distribution by specifying a size-one dimension of
height with coordinate value 10 m,
or by including the CF-convention "coordinates" attribute,
containing the name of a scalar coordinate variable for height
with the value of 10 m.
| CF Standard name | CAM/CCM3 name | CAM/CCM3 units | CF name | CF units | |
|---|---|---|---|---|---|
| 1 | air_temperature | T | K | ta | K |
| 2 | eastward_wind | U | m s<sup>-1</sup> | ua | m s<sup>-1</sup> |
| 3 | northward_wind | V | m s<sup>-1</sup> | va | m s<sup>-1</sup> |
| 4 | specific_humidity | Q | m s<sup>-1</sup> | hus | kg kg<sup>-1</sup> |
<sup>a</sup>
This data must be provided on pressure levels.
The set of pressure levels must include at least the following subset
of AMIP standard pressure levels:
1000, 925, 850, 700, 600, 500, 400, 300, 200 hPa.
<i>NOTE:
The following 3-hourly data may be provided for a smaller time period
than the daily means
but must extend for at least 1 year.
3-hourly precipitation should be an average; other 3-hourly data should
be instantaneous "snapshots"</i>:
| CF Standard name | CAM name | CAM units | CF name | CF units | |
|---|---|---|---|---|---|
| 1 | air_pressure_at_sea_level | PSL | Pa | psl | Pa |
| 2 | precipitation_flux | (PRECC+PRECL)*rH20 | m s<sup>-1</sup> | pr | kg m<sup>-2</sup> s<sup>-1</sup> |
| 3 | air_temperature<sup>a</sup> | TREFHT | K | tas | K |
| 4 | surface_upward_latent_heat_flux | (Lv+Lf)*QFLS - Lf10-3 (PRECC+PRECL) |
W m<sup>-2</sup> | hfls | W m<sup>-2</sup> |
| 5 | surface_upward_sensible_heat_flux | SHFLX | W m<sup>-2</sup> | hfss | W m<sup>-2</sup> |
| 6 | surface_downwelling_longwave_flux | SRFRAD-FSNS | W m<sup>-2</sup> | rlds | W m<sup>-2</sup> |
| 7 | surface_upwelling_longwave_flux | 5.67e-8*TS<sup>4</sup> | W m<sup>-2</sup> | rlus | W m<sup>-2</sup> |
| 8 | surface_downwelling_shortwave_flux | FSDS | W m<sup>-2</sup> | rsds | W m<sup>-2</sup> |
| 9 | surface_upwelling_shortwave_flux | FSDS-FSNS | W m<sup>-2</sup> | rsus | W m<sup>-2</sup> |
<sup>a</sup>Also known as "surface air temperature."
Distinguish from 3-D air temperature by specifying a size-one dimension of height with coordinate value 2 m, or by including the CF-convention "coordinates" attribute, containing the name of a scalar coordinate variable for height with the value of 2 m.
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