In the following table we list the different fields that are currently output to CLM2.0 history files. The dimensions of each field may include time (days ince the beginning of the simulation, lat (number of latitude points, e.g., lat = 64 for a T42 simulation), lon (number of longitude points, e.g., lon = 128 for a T42 simulation), or levsoi (number of soil layers, levsoi = 10). If a field's default state is inactive, it will not appear on a history file unless its state is modified via the namelist variable FLDADD.
| CLM2.0 History file fields | |
| Soil time-invariant properties | |
| WATSAT | |
| description | saturated soil water content (porosity) |
| units | mm3/mm3 |
| dimensions | time,levsoi,lat,lon |
| default averaging | constant (lakes, wetlands, glaciers excluded) |
| default active/inactive | active |
| SUCSAT | |
| description | saturated soil matric potential |
| units | mm |
| dimensions | time,levsoi,lat,lon |
| default averaging | constant (lakes, wetlands, glaciers excluded) |
| default active/inactive | active |
| BSW | |
| description | slope of soil water retention curve |
| units | unitless |
| dimensions | time,levsoi,lat,lon |
| default averaging | constant (lakes, wetlands, glaciers excluded) |
| default active/inactive | active |
| ZSOI | |
| description | "node" depth of soil layer (depth of soil layer at which hydraulic/thermal properties are defined) |
| units | m |
| dimensions | time,levsoi,lat,lon |
| default averaging | constant (lakes excluded) |
| default active/inactive | active |
| DZSOI | |
| description | soil layer thickness |
| units | m |
| dimensions | time,levsoi,lat,lon |
| default averaging | constant (lakes excluded) |
| default active/inactive | active |
| Temperatures | |
| TSA | |
| description | 2 m air temperature |
| units | K |
| dimensions | time,lat,lon |
| default averaging | average |
| default active/inactive | active |
| TV | |
| description | vegetation temperature |
| units | K |
| dimensions | time,lat,lon |
| default averaging | average |
| default active/inactive | active |
| TG | |
| description | ground temperature |
| units | K |
| dimensions | time,lat,lon |
| default averaging | average |
| default active/inactive | active |
| TSOI | |
| description | soil temperature |
| units | K |
| dimensions | time,levsoi,lat,lon |
| default averaging | average (lakes excluded) |
| default active/inactive | active |
| TLAKE | |
| description | lake temperature |
| units | K |
| dimensions | time,levsoi,lat,lon |
| default averaging | average (averaging done only for valid (lake) subgrid patches) |
| default active/inactive | active |
| TSNOW | |
| description | snow temperature |
| units | K |
| dimensions | time,lat,lon |
| default averaging | average (horizontal averaging done only for valid subgrid patches (those which have snow, lakes excluded), vertical averaging is done over all valid snow layers) |
| default active/inactive | active |
| Surface radiation | |
| FSA | |
| description | absorbed solar radiation |
| units | watt/m2 |
| dimensions | time,lat,lon |
| default averaging | average |
| default active/inactive | active |
| FSR | |
| description | reflected solar radiation |
| units | watt/m2 |
| dimensions | time,lat,lon |
| default averaging | average |
| default active/inactive | active |
| NDVI | |
| description | surface normalized difference vegetation index |
| units | unitless |
| dimensions | time,lat,lon |
| default averaging | average |
| default active/inactive | active |
| FIRA | |
| description | net infrared (longwave) radiation |
| units | watt/m2 |
| dimensions | time,lat,lon |
| default averaging | average |
| default active/inactive | active |
| FIRE | |
| description | emitted infrared (longwave) radiation |
| units | watt/m2 |
| dimensions | time,lat,lon |
| default averaging | average |
| default active/inactive | active |
| Surface energy fluxes | |
| FCTR | |
| description | canopy transpiration |
| units | watt/m2 |
| dimensions | time,lat,lon |
| default averaging | average |
| default active/inactive | active |
| FCEV | |
| description | canopy (intercepted) evaporation |
| units | watt/m2 |
| dimensions | time,lat,lon |
| default averaging | average |
| default active/inactive | active |
| FGEV | |
| description | ground evaporation |
| units | watt/m2 |
| dimensions | time,lat,lon |
| default averaging | average |
| default active/inactive | active |
| FSH | |
| description | sensible heat |
| units | watt/m2 |
| dimensions | time,lat,lon |
| default averaging | average |
| default active/inactive | active |
| FGR | |
| description | heat flux into snow/soil (includes snow melt) |
| units | watt/m2 |
| dimensions | time,lat,lon |
| default averaging | average |
| default active/inactive | active |
| FSM | |
| description | snow melt heat flux |
| units | watt/m2 |
| dimensions | time,lat,lon |
| default averaging | average |
| default active/inactive | active |
| TAUX | |
| description | zonal surface stress |
| units | kg/m/s2 |
| dimensions | time,lat,lon |
| default averaging | average |
| default active/inactive | active |
| TAUY | |
| description | meridional surface stress |
| units | kg/m/s2 |
| dimensions | time,lat,lon |
| default averaging | average |
| default active/inactive | active |
| Vegetation phenology | |
| ELAI | |
| description | exposed one-sided leaf area index |
| units | m2/m2 |
| dimensions | time,lat,lon |
| default averaging | average |
| default active/inactive | active |
| ESAI | |
| description | exposed one-sided stem area index |
| units | m2/m2 |
| dimensions | time,lat,lon |
| default averaging | average |
| default active/inactive | active |
| Canopy physiology | |
| RSSUN | |
| description | sunlit leaf stomatal resistance |
| units | s/m |
| dimensions | time,lat,lon |
| default averaging | minimum (lakes excluded) |
| default active/inactive | active |
| RSSHA | |
| description | shaded leaf stomatal resistance |
| units | s/m |
| dimensions | time,lat,lon |
| default averaging | minimum (lakes excluded) |
| default active/inactive | active |
| BTRAN | |
| description | transpiration beta factor (soil moisture limitation) |
| units | unitless |
| dimensions | time,lat,lon |
| default averaging | average (lakes excluded) |
| default active/inactive | active |
| FPSN | |
| description | photosynthesis |
| units | unitless |
| dimensions | time,lat,lon |
| default averaging | average (lakes excluded) |
| default active/inactive | active |
| Hydrology | |
| H2OSOI | |
| description | volumetric soil water |
| units | mm3/mm3 |
| dimensions | time,levsoi,lat,lon |
| default averaging | average (lakes excluded) |
| default active/inactive | active |
| H2OSNO | |
| description | snow depth (liquid water equivalent) |
| units | mm |
| dimensions | time,lat,lon |
| default averaging | average |
| default active/inactive | active |
| H2OCAN | |
| description | intercepted water |
| units | mm |
| dimensions | time,lat,lon |
| default averaging | average |
| default active/inactive | active |
| SOILLIQ | |
| description | soil liquid water |
| units | kg/m2 |
| dimensions | time,levsoi,lat,lon |
| default averaging | average (lakes excluded) |
| default active/inactive | active |
| SOILICE | |
| description | soil ice |
| units | kg/m2 |
| dimensions | time,levsoi,lat,lon |
| default averaging | average (lakes excluded) |
| default active/inactive | active |
| SNOWLIQ | |
| description | snow liquid water |
| units | kg/m2 |
| dimensions | time,lat,lon |
| default averaging | average (horizontal averaging done only for valid subgrid patches (those which have snow, lakes excluded), vertical averaging done by summing over all valid snow layers) |
| default active/inactive | active |
| SNOWICE | |
| description | snow ice |
| units | kg/m2 |
| dimensions | time,lat,lon |
| default averaging | average (horizontal averaging done only for valid subgrid patches (those which have snow, lakes excluded), vertical averaging done by summing over all valid snow layers) |
| default active/inactive | active |
| SNOWDP | |
| description | snow height |
| units | m |
| dimensions | time,lat,lon |
| default averaging | average |
| default active/inactive | active |
| SNOWAGE | |
| description | snow age |
| units | unitless |
| dimensions | time,lat,lon |
| default averaging | average |
| default active/inactive | active |
| QINFL | |
| description | infiltration |
| units | mm/s |
| dimensions | time,lat,lon |
| default averaging | average |
| default active/inactive | active |
| QOVER | |
| description | surface runoff |
| units | mm/s |
| dimensions | time,lat,lon |
| default averaging | average |
| default active/inactive | active |
| QRGWL | |
| description | surface runoff at glaciers, wetlands, lakes |
| units | mm/s |
| dimensions | time,lat,lon |
| default averaging | average |
| default active/inactive | active |
| QDRAI | |
| description | sub-surface drainage |
| units | mm/s |
| dimensions | time,lat,lon |
| default averaging | average |
| default active/inactive | active |
| QINTR | |
| description | interception |
| units | mm/s |
| dimensions | time,lat,lon |
| default averaging | average |
| default active/inactive | active |
| QDRIP | |
| description | throughfall |
| units | mm/s |
| dimensions | time,lat,lon |
| default averaging | average |
| default active/inactive | active |
| QMELT | |
| description | snow melt |
| units | mm/s |
| dimensions | time,lat,lon |
| default averaging | average |
| default active/inactive | active |
| QSOIL | |
| description | ground evaporation |
| units | mm/s |
| dimensions | time,lat,lon |
| default averaging | average |
| default active/inactive | active |
| QVEGE | |
| description | canopy (intercepted) evaporation |
| units | mm/s |
| dimensions | time,lat,lon |
| default averaging | average |
| default active/inactive | active |
| QVEGT | |
| description | canopy transpiration |
| units | mm/s |
| dimensions | time,lat,lon |
| default averaging | average |
| default active/inactive | active |
| QCHOCNR | |
| description | RTM river discharge into ocean |
| units | m3/s |
| dimensions | time,lat,lon |
| default averaging | average |
| default active/inactive | active (if RTM defined) |
| QCHANR | |
| description | RTM river flow (maximum subgrid flow) |
| units | m3/s |
| dimensions | time,lat,lon |
| default averaging | average |
| default active/inactive | active (if RTM defined) |
| Water and energy balance checks | |
| ERRSOI | |
| description | soil/lake energy conservation error |
| units | watt/m2 |
| dimensions | time,lat,lon |
| default averaging | average |
| default active/inactive | active |
| ERRSEB | |
| description | surface energy conservation error |
| units | watt/m2 |
| dimensions | time,lat,lon |
| default averaging | average |
| default active/inactive | active |
| ERRSEBMX | |
| description | maximum of surface energy conservation error |
| units | watt/m2 |
| dimensions | time,lat,lon |
| default averaging | maximum |
| default active/inactive | active |
| ERRSOL | |
| description | solar radiation conservation error |
| units | watt/m2 |
| dimensions | time,lat,lon |
| default averaging | average |
| default active/inactive | active |
| ERRH2O | |
| description | total water conservation error |
| units | mm |
| dimensions | time,lat,lon |
| default averaging | average |
| default active/inactive | active |
| Atmospheric forcing | |
| RAIN | |
| description | rain |
| units | mm/s |
| dimensions | time,lat,lon |
| default averaging | average |
| default active/inactive | active |
| SNOW | |
| description | snow |
| units | mm/s |
| dimensions | time,lat,lon |
| default averaging | average |
| default active/inactive | active |
| TBOT | |
| description | atmospheric air temperature |
| units | K |
| dimensions | time,lat,lon |
| default averaging | average |
| default active/inactive | active |
| WIND | |
| description | atmospheric wind velocity magnitude |
| units | m/s |
| dimensions | time,lat,lon |
| default averaging | average |
| default active/inactive | active |
| THBOT | |
| description | atmospheric air potential temperature |
| units | K |
| dimensions | time,lat,lon |
| default averaging | average |
| default active/inactive | active |
| QBOT | |
| description | atmospheric specific humidity |
| units | kg/kg |
| dimensions | time,lat,lon |
| default averaging | average |
| default active/inactive | active |
| ZBOT | |
| description | atmospheric reference height |
| units | m |
| dimensions | time,lat,lon |
| default averaging | average |
| default active/inactive | active |
| FLDS | |
| description | incident longwave radiation |
| units | watt/m2 |
| dimensions | time,lat,lon |
| default averaging | average |
| default active/inactive | active |
| FSDS | |
| description | incident solar radiation |
| units | watt/m2 |
| dimensions | time,lat,lon |
| default averaging | average |
| default active/inactive | active |
| Time-invariant grid fields (these are defined in subroutine histcrt.F90 and should not be changed) | |
| EDGEN | |
| description | northern edge of surface grid |
| units | degrees north |
| dimensions | scalar |
| default averaging | constant |
| default active/inactive | active (if OFFLINE defined) |
| EDGEE | |
| description | eastern edge of surface grid |
| units | degrees east |
| dimensions | scalar |
| default averaging | constant |
| default active/inactive | active (if OFFLINE defined) |
| EDGES | |
| description | southern edge of surface grid |
| units | degrees south |
| dimensions | scalar |
| default averaging | constant |
| default active/inactive | active (if OFFLINE defined) |
| EDGEW | |
| description | western edge of surface grid |
| units | degrees west |
| dimensions | scalar |
| default averaging | constant |
| default active/inactive | active (if OFFLINE defined) |
| LON | |
| description | coordinate longitude |
| units | degrees east |
| dimensions | lon |
| default averaging | constant |
| default active/inactive | active |
| LAT | |
| description | coordinate latitude |
| units | degrees north |
| dimensions | lat |
| default averaging | constant |
| default active/inactive | active |
| LEVSOI | |
| description | coordinate soil levels |
| units | m |
| dimensions | levsoi |
| default averaging | constant |
| default active/inactive | active |
| TIME | |
| description | time |
| units | days since beginning of run |
| dimensions | time |
| default averaging | constant |
| default active/inactive | active |
| LONGXY | |
| description | longitude |
| units | degrees east |
| dimensions | lat,lon |
| default averaging | constant |
| default active/inactive | active |
| LATIXY | |
| description | latitude |
| units | degrees north |
| dimensions | lat,lon |
| default averaging | constant |
| default active/inactive | active |
| AREA | |
| description | grid cell area |
| units | km2 |
| dimensions | lat,lon |
| default averaging | constant |
| default active/inactive | active |
| LANDFRAC | |
| description | land fraction |
| units | unitless |
| dimensions | lat,lon |
| default averaging | constant |
| default active/inactive | active |
| NUMLON | |
| description | number of longitudes at each latitude |
| units | unitless |
| dimensions | lat |
| default averaging | constant |
| default active/inactive | active |
| LANDMASK | |
| description | land/ocean mask |
| units | (0.=ocean and 1.=land) |
| dimensions | lat,lon |
| default averaging | constant |
| default active/inactive | active |
| Time-information fields (these are defined in sub routine histcrt.F90 and should not be changed) | |
| MCDATE | |
| description | current date as 8 digit integer |
| units | YYYYMMDD |
| dimensions | time |
| default averaging | instant |
| default active/inactive | active |
| MCSEC | |
| description | current seconds of current date |
| units | s |
| dimensions | time |
| default averaging | instant |
| default active/inactive | active |
| MDCUR | |
| description | current day (from base day) |
| units | unitless |
| dimensions | time |
| default averaging | instant |
| default active/inactive | active |
| NSTEP | |
| description | time step |
| units | unitless |
| dimensions | time |
| default averaging | instant |
| default active/inactive | active |
| TIME_COMMENT | |
| description | history interval for time slice |
| units | character |
| dimensions | time,string_length(80) |
| default averaging | instant |
| default active/inactive | active |