C-LAMP Common Model Output Fields

Version 2.1 - August 30, 2008

While all models participating in the Carbon Land Model intercomparison Project (C-LAMP) will output their own "native" fields, a common set of fields is needed to facilitate head-to-head comparison of the models to each other and to available observational datasets. Model results transmitted to the Earth System Grid for redistribution to the community will use common field names, netCDF long names, CF Standard Names and units. Contained below is a table of the common output fields required for the C-LAMP and consistent with the metadata conventions used for CMIP3, formerly called the IPCC 4^th Assessment Model Output database. Corrections and suggestions are solicited on this information. Software is available for rewriting model output into netCDF files following the Climate and Forecast (CF) Metadata Convention.

atmospheric forcing
Common Field Name	Long Name & CF Standard Name	Units	Description	Statistics
husf	Specific humidity at atmospheric forcing height specific_humidity‡	kg kg-1	Specific humidity at atmospheric forcing height	MA, MH
prra	Rainfall precipitation flux rainfall_flux‡	kg m-2 s-1	Rainfall precipitation flux	MA, MH
prsn†	Snowfall precipitation flux snowfall_flux‡	kg m-2 s-1	Snowfall precipitation flux	MA, MH
biogeochemistry
Common Field Name	Long Name & CF Standard Name	Units	Description	Statistics
agbc*	Above-ground biomass carbon above_ground_biomass_carbon_content	kg m-2	Total above-ground biomass carbon (live + dead + cwd)	MA
aglbc*	Above-ground live biomass carbon above_ground_live_biomass_carbon_content	kg m-2	Above-ground live biomass carbon	MA
agnpp	Above-ground net primary production above_ground_net_primary_productivity_of_carbon	kg m-2 s-1	Above-ground net primary production	MA
ar	Autotrophic respiration autotrophic_respiration_of_carbon	kg m-2 s-1	Autotrophic respiration	MA, MH
bco	Biogenic carbon monoxide flux biogenic_carbon_monoxide_flux	kg m-2 s-1	Total biogenic carbon monoxide flux out of biosphere	MA
bgbc*	Below-ground biomass carbon below_ground_biomass_carbon_content	kg m-2	Total below-ground biomass carbon (live + dead)	MA
bgnpp	Below-ground net primary production below_ground_net_primary_productivity_of_carbon	kg m-2 s-1	Below-ground net primary production	MA
bipn	Biogenic isoprene flux biogenic_isoprene_flux	kg m-2 s-1	Total biogenic isoprene flux out of biosphere	MA
bmtpn	Biogenic monoterpene flux biogenic_monoterpene_flux	kg m-2 s-1	Total biogenic monoterpene flux out of biosphere	MA
borvoc	Biogenic other reactive volatile organic compound flux biogenic_other_reactive_volatile_organic_compound_flux	kg m-2 s-1	Total biogenic other reactive volatile organic compound flux out of biosphere	MA
bovoc	Biogenic other volatile organic compound flux biogenic_other_volatile_organic_compound_flux	kg m-2 s-1	Total of biogenic other volatile organic compound flux out of biosphere	MA
cwdc	Coarse woody debris carbon coarse_woody_debris_carbon_content	kg m-2	Coarse woody debris carbon	MA
cwdc_hr	Coarse woody debris heterotrophic respiration coarse_woody_debris_heterotrophic_respiration_of_carbon	kg m-2 s-1	Coarse woody debris heterotrophic respiration	MA
cwdc_loss	Coarse woody debris carbon loss coarse_woody_debris_carbon_flux	kg m-2 s-1	Coarse woody debris carbon loss	MA
froot_litterc*	Fine root litter carbon fine_root_litter_carbon_content	kg m-2	Fine root litter carbon	MA
froot_litterc_hr*	Fine root litter heterotrophic respiration fine_root_litter_heterotrophic_respiration_of_carbon	kg m-2 s-1	Fine root litter heterotrophic respiration	MA
froot_litterc_loss*	Fine root litter carbon loss fine_root_litter_carbon_flux	kg m-2 s-1	Fine root litter carbon loss	MA
frootc	Fine root carbon fine_root_carbon_content	kg m-2	Fine root carbon	MA
frootc_alloc	Fine root carbon allocation fine_root_allocation_of_carbon	kg m-2 s-1	Fine root carbon allocation	MA, MH
frootc_loss	Fine root carbon loss fine_root_carbon_flux	kg m-2 s-1	Fine root carbon loss	MA
gpp	Gross primary production gross_primary_productivity_of_carbon‡	kg m-2 s-1	Gross primary production	MA, MH
gnmin	Gross nitrogen mineralization gross_mineralization_of_nitrogen	kg m-2 s-1	Gross rate of nitrogen mineralization	MA
hr	Heterotrophic respiration heterotrophic_respiration_of_carbon	kg m-2 s-1	Heterotrophic respiration	MA
leaf_litterc*	Leaf litter carbon leaf_litter_carbon_content	kg m-2	Leaf litter carbon	MA
leaf_litterc_hr*	Leaf litter heterotrophic respiration leaf_litter_heterotrophic_respiration_of_carbon	kg m-2 s-1	Leaf litter heterotrophic respiration	MA
leaf_litterc_loss*	Leaf litter carbon loss leaf_litter_carbon_flux	kg m-2 s-1	Leaf litter carbon loss	MA
leafc	Leaf carbon leaf_carbon_content	kg m-2	Leaf carbon	MA
leafc_alloc	Leaf carbon allocation leaf_allocation_of_carbon	kg m-2 s-1	Leaf carbon allocation	MA, MH
leafc_loss	Leaf carbon loss leaf_carbon_flux	kg m-2 s-1	Leaf carbon loss	MA
litterc	Litter carbon litter_carbon_content‡	kg m-2	Total litter carbon excluding coarse woody debris carbon	MA
litterc_hr	Litter heterotrophic respiration litter_heterotrophic_respiration_of_carbon	kg m-2 s-1	Litter heterotrophic respiration	MA
litterc_loss	Litter carbon loss litter_carbon_flux**	kg m-2 s-1	Litter carbon loss	MA
nee	Net ecosystem exchange net_ecosystem_exchange_of_carbon_out_of_biosphere	kg m-2 s-1	Net ecosystem exchange (GPP, Re, and fire)	MA, MH
nep	Net ecosystem production net_ecosystem_productivity_of_carbon	kg m-2 s-1	Net ecosystem production (GPP and Re)	MA, MH
nnmin	Net nitrogen mineralization net_mineralization_of_nitrogen	kg m-2 s-1	Net rate of nitrogen mineralization	MA
npp	Net primary production net_primary_productivity_of_carbon‡	kg m-2 s-1	Total net primary production	MA
soilc	Soil organic matter carbon soil_carbon_content‡	kg m-2	Total soil organic matter carbon, excluding coarse woody debris carbon and litter	MA
soilc_hr	Soil heterotrophic respiration soil_heterotrophic_respiration_of_carbon	kg m-2 s-1	Soil heterotrophic respiration	MA
soilc_loss	Soil carbon loss soil_carbon_flux	kg m-2 s-1	Soil carbon loss, excluding coarse woody debris and litter	MA
tbvoc	Total biogenic volatile organic compound flux total_biogenic_volatile_organic_compound_flux	kg m-2 s-1	Total biogenic volatile organic compound flux out of biosphere	MA
woodc	Wood carbon wood_carbon_content	kg m-2	Wood carbon	MA
woodc_alloc	Wood carbon allocation wood_allocation_of_carbon	kg m-2 s-1	Wood carbon allocation	MA, MH
woodc_loss	Wood carbon loss wood_carbon_flux	kg m-2 s-1	Wood carbon loss	MA
energy
Common Field Name	Long Name & CF Standard Name	Units	Description	Statistics
hfg	Surface heat flux into soil downward_heat_flux_at_ground_level_in_soil‡	W m-2	Heat flux into soil	MA, MH
hfls†	Surface latent heat flux surface_upward_latent_heat_flux‡	W m-2	Latent heat flux	MA, MH
hfss†	Surface sensible heat flux surface_upward_sensible_heat_flux‡	W m-2	Sensible heat flux	MA, MH
hfssg	Surface sensible heat flux from ground surface_upward_sensible_heat_flux_from_ground	W m-2	Sensible heat flux from ground	MA, MH
hfssv	Surface sensible heat flux from vegetation surface_upward_sensible_heat_flux_from_vegetation	W m-2	Sensible heat flux from vegetation	MA, MH
grid
Common Field Name	Long Name & CF Standard Name	Units	Description	Statistics
gca	Grid cell area area‡	m2	Grid cell area	constant
lbm	Land mask land_binary_mask‡	1	Land mask	constant
lcf (multi-level)	Land cover fraction land_cover_fraction	1	Land cover fraction for each land cover type (multi-level)	MA
lcn	Land cover name land_cover_name		Land cover name	constant
orog†	Surface altitude surface_altitude‡	m	Surface altitude	constant
sftlf†	Land area fraction land_area_fraction‡	1	Land area fraction	constant
humidity
Common Field Name	Long Name & CF Standard Name	Units	Description	Statistics
hur2m	Relative humidity at 2m above surface relative_humidity‡	%	Relative humidity at 2m above surface	MA, MH
hus2m	Specific humidity at 2m above surface specific_humidity‡	kg kg-1	Specific humidity at 2m above surface	MA, MH
hydrology
Common Field Name	Long Name & CF Standard Name	Units	Description	Statistics
btran	Transpiration beta factor transpiration_beta_factor	1	Transpiration beta factor	MA, MH
et	Evapotranspiration water_evapotranspiration_flux	kg m-2 s-1	Evapotranspiration	MA, MH
evspsblsoi	Soil evaporation water_evaporation_flux_from_soil‡	kg m-2 s-1	Soil evaporation	MA, MH
evspsblveg†	Evaporation from vegetation canopy water_evaporation_flux_from_canopy‡	kg m-2 s-1	Canopy evaporation	MA, MH
mrfsl (multi-level)	Soil frozen water content in each soil layer frozen_water_content_of_soil_layer‡	kg m-2	Soil frozen water content in each soil layer, excluding surface snow and ice (multi-level)	MA, MH
mrfso†	Soil frozen water content soil_frozen_water_content‡	kg m-2	Soil frozen water content, excluding surface snow and ice	MA, MH
mrlsl (multi-level)	Soil liquid water content in each soil layer liquid_water_content_of_soil_layer‡	kg m-2	Soil liquid water content in each soil layer (multi-level)	MA, MH
mrlso	Soil liquid water content soil_liquid_water_content	kg m-2	Soil liquid water content	MA, MH
mrros†	Surface runoff surface_runoff_flux‡	kg m-2 s-1	Surface runoff	MA, MH
mrross	Subsurface drainage subsurface_runoff_flux‡	kg m-2 s-1	Subsurface drainage	MA, MH
prveg†	Canopy interception precipitation_flux_onto_canopy	kg m-2 s-1	Canopy interception	MA, MH
snd†	Snow depth surface_snow_thickness‡	m	Snow depth	MA, MH
tran	Transpiration transpiration_flux‡	kg m-2 s-1	Transpiration	MA, MH
vfwsl (multi-level)	Volumetric soil water in each soil layer volume_fraction_of_water_in_soil_layer	m3 m-3	Volumetric soil water in each soil layer (multi-level)	MA, MH
wpsl (multi-level)	Soil water potential in each soil layer water_potential_of_soil_layer	Pa	Soil water potential in each soil layer (multi-level)	MA, MH
radiation
Common Field Name	Long Name & CF Standard Name	Units	Description	Statistics
alsas	Surface all sky albedo surface_all_sky_albedo	1	Surface all sky albedo	MA, MH
alsbs	Surface black sky albedo surface_black_sky_albedo	1	Surface black sky albedo	MA, MH
laisha	Shaded projected leaf area index shaded_projected_leaf_area_index	m2 m-2	Shaded projected leaf area index	MA, MH
laisun	Sunlit projected leaf area index sunlit_projected_leaf_area_index	m2 m-2	Sunlit projected leaf area index	MA, MH
rlds†	Surface downwelling longwave radiation surface_downwelling_longwave_flux_in_air‡	W m-2	Downward infrared radiation	MA, MH
rls†	Surface net downward longwave radiation surface_net_downward_longwave_flux‡	W m-2	Net infrared radiation	MA, MH
rlus†	Surface upwelling longwave radiation surface_upwelling_longwave_flux_in_air‡	W m-2	Surface upwelling longwave radiation	MA, MH
rs	Surface net downward radiation surface_net_downward_radiative_flux‡	W m-2	Surface net downward radiation	MA, MH
rsas	Surface absorbed shortwave radiation surface_absorbed_shortwave_flux	W m-2	Surface absorbed shortwave radiation	MA, MH
rsasg	Surface absorbed shortwave radiation in soil surface_absorbed_shortwave_flux_in_soil	W m-2	Surface absorbed shortwave radiation in soil	MA, MH
rsasv	Surface absorbed shortwave radiation in vegetation surface_absorbed_shortwave_flux_in_vegetation	W m-2	Surface absorbed shortwave radiation in vegetation	MA, MH
rsds†	Surface downwelling shortwave radiation surface_downwelling_shortwave_flux_in_air‡	W m-2	Surface downwelling shortwave radiation	MA, MH
rsus†	Surface upwelling shortwave radiation surface_upwelling_shortwave_flux_in_air‡	W m-2	Surface upwelling shortwave radiation	MA, MH
snc†	Snow area fraction surface_snow_area_fraction‡	1	Snow area fraction	MA
temperature
Common Field Name	Long Name & CF Standard Name	Units	Description	Statistics
degday	Accumulated degree days accumulated_degree_days	K	Accumulated degree days	MA
ta2m	Air temperature at 2m above surface air_temperature‡	K	Air temperature at 2m above surface	MA, MH
ta2mdmax	Daily maximum of average air temperature at 2m above surface air_temperature‡	K	Daily maximum of average air temperature at 2m above surface	MA, MH
ta2mdmin	Daily minimum of average air temperature at 2m above surface air_temperature‡	K	Daily minimum of average air temperature at 2m above surface	MA, MH
tsl (multi-level)	Temperature of each soil layer temperature_of_soil_layer	K	Temperature of each soil layer (multi-level)	MA, MH
tv	Vegetation temperature vegetation_temperature	K	Vegetation temperature	MA, MH
vegetation phenology
Common Field Name	Long Name & CF Standard Name	Units	Description	Statistics
laiexp	Exposed one-sided leaf area index exposed_one_sided_leaf_area_index	m2 m-2	Exposed one-sided leaf area index	MA
laitot	Total one-sided leaf area index total_one_sided_leaf_area_index	m2 m-2	Total one-sided leaf area index	MA, MH
saiexp	Exposed one-sided stem area index exposed_one_sided_stem_area_index	m2 m-2	Exposed one-sided stem area index	MA
saitot	Total one-sided stem area index total_one_sided_stem_area_index	m2 m-2	Total one-sided stem area index	MA, MH
vegetation physiology
Common Field Name	Long Name & CF Standard Name	Units	Description	Statistics
psn	Photosynthesis photosynthesis_of_carbon	kg m-2 s-1	Photosynthesis	MA, MH
rssha	Shaded leaf stomatal resistance Shaded_leaf_stomatal_resistance	s m-1	Shaded leaf stomatal resistance	MA, MH
rssun	Sunlit leaf stomatal resistance sunlit_leaf_stomatal_resistance	s m-1	Sunlit leaf stomatal resistance	MA, MH

^†Existing AMIP/CMIP Variable Name
^‡Existing CF Standard Name
**Existing CF Standard Name requiring new definition
*Added in Version 2.0