6.1 Model history fields

Tables 9-16 list the fields that currently may be output to a CLM2.1 history tape. By default, these fields are also on the primary history tape. The dimensions of each field may include 'time' (days ince the beginning of the simulation, 'levsoi' (number of soil layers, levsoi = 10) and 'lat' and 'lon' (number of latitude and longitude points, e.g., lat=64, lon=128 for a T42 simulation), for grid averaged two dimensional output and 'gridcell', 'landunit', 'column' or 'pft' for one dimensional output. Note that the 1d dimension type appearing in the dimensions entry specifies only the default 1d output type. For example, 'TSA' will be output by default in column 1d output. However, that default type may be changed for a given history tape via the setting of the namelist variable HIST_TYPE1D_PERTAPE. The Level column can contain either SL or ML as an entry, denoting a single-level or multi-level field, respectively. Finally, unless explicitly specified in the description, all fields are time averaged over the requested history interval.

Table 9: Master Field List - Temperature

Name	Description	Units	1d Output	Level	Spatial Validity
TSA	2 m air temperature	K	column	SL	global
TV	vegetation temperature	K	column	SL	global
TG	ground temperature	K	column	SL	global
TSOI	soil temperature	K	column	ML	lakes excluded
TLAKE	lake temperature	K	column	ML	nonlakes excluded
TSNOW	snow temperature	K	column	SL	lakes excluded

Table 10: Master Field List -Surface Radiation

Name	Description	Units	1d Output	Level	Spatial Validity
FSA	absorbed solar radiation	watt/m2	column	SL	global
FSR	reflected solar radiation	watt/m2	column	SL	global
NDVI	surface normalized difference vegetation index	unitless	column	SL	global
FIRA	net infrared (longwave) radiation	watt/m2	column	SL	global
FIRE	emitted infrared (longwave) radiation	watt/m2	column	SL	global

Table 11: Master Field List -Surface Energy Fluxes

Name	Description	Units	1d Output	Level	Spatial Validity
FCTR	canopy transpiration	watt/m2	column	SL	global (set to 0 over lakes)
FCEV	canopy (intercepted) evaporation	watt/m2	column	SL	global (set to 0 over lakes)
FGEV	ground evaporation	watt/m2	column	SL	global
FSH	sensible heat	watt/m2	column	SL	global
FGR	heat flux into snow/soil (includes snow melt)	watt/m2	column	SL	global
FSM	snow melt heat flux	watt/m2	column	SL	global
TAUX	zonal surface stress	kg/m/s2	column	SL	global
TAUY	meridional surface stress	kg/m/s2	column	SL	global

Table 12: Master Field List - Vegetation Phenology

Name	Description	Units	1d Output	Level	Spatial Validity
ELAI	exposed one-sided leaf area index	m2/m2	column	SL	global
ESAI	exposed one-sided stem area index	m2/m2	column	SL	global

Table 13: Master Field List - Canopy Physiology

Name	Description	Units	1d Output	Level	Spatial Validity
RSSUN	sunlit leaf stomatal resistance (minimum over time interval)	s/m	column	SL	excludes lakes
RSSHA	shaded leaf stomatal resistance (minimum over time interval)	s/m	column	SL	excludes lakes
BTRAN	transpiration beta factor (soil moisture limitation)	unitless	column	SL	excludes lakes
FPSN	photosynthesis	unitless	column	SL	excludes lakes

Table 14: Master Field List - Hydrology

Name	Description	Units	1d Output	Level	Spatial Validity
H2OSOI	volumetric soil water	mm3/mm3	column	ML	excludes lakes
H2OSNO	snow depth (liquid water equivalent)	mm	column	SL	global
H2OCAN	intercepted water	mm	column	SL	global (set to 0 over lakes)
SOILLIQ	soil liquid water	kg/m2	column	ML	excludes lakes
SOILICE	soil ice	kg/m2	column	ML	excludes lakes
SNOWLIQ	snow liquid water	kg/m2	column	SL	excludes lakes
SNOWICE	snow ice	kg/m2	column	SL	excludes lakes
SNOWDP	snow height	m	column	SL	global
SNOWAGE	snow age	unitless	column	SL	global (set to 0 over lakes)
QINFL	infiltration	mm/s	column	SL	global
QOVER	surface runoff	mm/s	column	SL	global
QRWGL	surface runoff at glaciers, wetlands, lakes	mm/s	column	SL	global
QDRAI	sub-surface drainage	mm/s	column	SL	global
QINTR	interception	mm/s	column	SL	global (set to 0 over lakes)
QDRIP	throughfall	mm/s	column	SL	global
QMELT	snow melt	mm/s	column	SL	global
QSOIL	ground evaporation	mm/s	column	SL	global
QVEGE	canopy (intercepted) evaporation	mm/s	column	SL	global (set to 0 over lakes)
QVEGT	canopy transpiration	mm/s	column	SL	global (set to 0 over lakes)
QCHOCNR	RTM river discharge into ocean	m3/s	column	SL	global (only included if RTM defined)
QCHANR	RTM river flow (maximum subgrid flow)	m3/s	column	SL	global (only included if RTM defined)

Table 15: Master Field List - Water and Energy Balance Checks

Name	Description	Units	1d Output	Level	Spatial Validity
ERRSOI	soil/lake energy conservation error	watt/m2	column	SL	global
ERRSEB	surface energy conservation error	watt/m2	column	SL	global
ERRSOL	solar radiation conservation error	watt/m2	column	SL	global
ERRH2O	total water conservation error	mm	column	SL	global

Table 16: Master Field List - Atmospheric Forcing

Name	Description	Units	1d Output	Level	Spatial Validity
RAIN	rain	mm/s	gridcell	SL	global
SNOW	snow	mm/s	gridcell	SL	global
TBOT	atmospheric air temperature	K	gridcell	SL	global
WIND	atmospheric wind velocity magnitude	m/s	gridcell	SL	global
THBOT	atmospheric air potential temperature	K	gridcell	SL	global
QBOT	atmospheric specific humidity	kg/kg	gridcell	SL	global
ZBOT	atmospheric reference height	m	gridcell	SL	global
FLDS	incident longwave radiation	watt/m2	gridcell	SL	global
FSDS	incident solar radiation	watt/m2	gridcell	SL	global

Note that for snow related fields (e.g. SNOWLIQ), horizontal averaging is done only using columns that have snow. In this horizontal averaging lake subgrid points are excluded. Furthermore, for snow related fields, vertical averaging is done by summing only over valid snow layers.