Variables in TREX 5-Minute Data Set

Most variables will have a "time" dimension, indicating they are time-series variables. Variables with a "station" dimension were sampled at more than one station or site.

Variables with a "sample" dimension are available at a resolution of 1/sample times the resolution of the dataset. For example, in a file of 5 minute statistics, a sample dimension of 5 indicates that the variable is available at 1 minute resolution.

For more information on variable names, see the ISFF Variable Name Convention .

Variables that were slowly sampled (usually once per second, or less) start with an upper case character (P, RH, T, etc). Lower case is used for more rapidly sampled variables, typically those used in eddy correlation, like u,v,w,tc,h2o, etc.

Higher moments are represented by products of variables, separated by single quotes. For example, u'v' is the covariance of u and v.

To save space, third and fourth moments of eddy correlation variables aren't listed in the table, but are available in the datasets.

Standard NetCDF variable names should only contain alphanumeric characters and underscores. Therefore, in Netcdf files the actual variable names will be the variable name shown here, with underscores substituted for periods and quotes. The variable name shown in this table will be saved as the "short_name" attribute of the Netcdf variable.

Variable Name	Description	Units	Dimension	Sensor	Notes
base_time	Seconds since 1970 Jan 1 00:00 GMT	seconds
time	Seconds since base_time	seconds	time
Cvsoil	Soil Heat Capacity	J/(m^3 K)	time x station
Gsoil	Soil Heat Flux	W/m^2	time x station
H.30m	Sensible Heat Flux	W/m^2	time x station
H.5m	Sensible Heat Flux	W/m^2	time x station
LE.30m	Latent Heat Flux	W/m^2	time x station
LE.5m	Latent Heat Flux	W/m^2	time x station
N07.5m	Aerosol:0.7 micron	counts/s	time x station
N10.5m	Aerosol:1 micron	counts/s	time x station
N20.5m	Aerosol:2 micron	counts/s	time x station
N30.5m	Aerosol:3 micron	counts/s	time x station
N40.5m	Aerosol:4 micron	counts/s	time x station
N50.5m	Aerosol:5 micron	counts/s	time x station
P	Barometric Pressure	mb	time x station
Pcell.5m	Analyzer Internal Pressure	kPa	time x station
Q.15m	Specific Humidity	g/kg	time x station
Q.30m	Specific Humidity	g/kg	time x station
Q.5m	Specific Humidity	g/kg	time x station
Qsoil	Soil Moisture	%vol	time x station
RH.15m	Rel. Humidity	%	time x station
RH.30m	Rel. Humidity	%	time x station
RH.5m	Rel. Humidity	%	time x station
Rain		.01in/5sec	time x station
Rlw.in.10m	Incoming Longwave	W/m^2	time x station
Rlw.in	Incoming Longwave	W/m^2	time x station
Rlw.out.10m	Outgoing Longwave	W/m^2	time x station
Rlw.out.a1	Outgoing Longwave	W/m^2	time x station
Rlw.out.a2	Outgoing Longwave	W/m^2	time x station
Rlw.out	Outgoing Longwave	W/m^2	time x station
Rnet	Net Radiation	W/m^2	time x station
Rpile.in.10m	Up-looking Thermopile	W/m^2	time x station
Rpile.in	Up-looking Thermopile	W/m^2	time x station
Rpile.out.10m	Down-looking Thermopile	W/m^2	time x station
Rpile.out.a1	Down-looking Thermopile	W/m^2	time x station
Rpile.out.a2	Down-looking Thermopile	W/m^2	time x station
Rpile.out	Down-looking Thermopile	W/m^2	time x station
Rsw.in	Incoming Shortwave	W/m^2	time x station
Rsw.out	Outgoing Shortwave	W/m^2	time x station
T.15m	Air Temp	degC	time x station
T.30m	Air Temp	degC	time x station
T.5m	Air Temp	degC	time x station
Tau63	TP01 Output	s	time x station
Tau63_max		s	time x station
Tbaro	Barometer Internal Temperature	degC	time x station
Tcase.in.10m	Up-looking Case Temp	degC	time x station
Tcase.in	Up-looking Case Temp	degC	time x station
Tcase.out.10m	Down-looking Case Temp	degC	time x station
Tcase.out.a1	Down-looking Case Temp	degC	time x station
Tcase.out.a2	Down-looking Case Temp	degC	time x station
Tcase.out	Down-looking Case Temp	degC	time x station
Tcell.5m	Analyzer Internal Temperature	degC	time x station
Tdome.in	Up-looking Dome Temp	degC	time x station
Tdome.out	Down-looking Dome Temp	degC	time x station
Tsoil	Soil Temperature	degC	time x station
Vbatt.10m	Battery Voltage	V	time x station
Vbatt.a1	Battery Voltage	V	time x station
Vbatt.a2	Battery Voltage	V	time x station
Vbatt.rad	Battery Voltage	V	time x station
Vheat	TP01 Output	V	time x station
Vheat_max		V	time x station
Vpile	TP01 Output	mV	time x station
Vpile_max		mV	time x station
Vqsoil	ECH2O Output	mV	time x station
Vtcase.in.10m	CG4 Output	V	time x station
Vtcase.in	CG4 Output	V	time x station
Vtcase.out.10m	CG4 Output	V	time x station
Vtcase.out.a1	CG4 Output	V	time x station
Vtcase.out.a2	CG4 Output	V	time x station
Vtcase.out	CG4 Output	V	time x station
asoil	Soil Thermal Diffusivity	m^2/s	time x station
co2'co2'.5m	co2 variance	(mmole/m^3)^2	time x station
co2.5m	Carbon Dioxide Density	mmole/m^3	time x station
co2raw.5m	Analyzer Output		time x station
diag.10m	CSAT3 Error Code		time x station
diag.15m	CSAT3 Error Code		time x station
diag.1m	CSAT3 Error Code		time x station
diag.20m	CSAT3 Error Code		time x station
diag.25m	CSAT3 Error Code		time x station
diag.2m	CSAT3 Error Code		time x station
diag.30m	CSAT3 Error Code		time x station
diag.3m	CSAT3 Error Code		time x station
diag.5m	CSAT3 Error Code		time x station
dir.10m	Sonic Wind Direction	deg	time x station
dir.15m	Sonic Wind Direction	deg	time x station
dir.1m	Sonic Wind Direction	deg	time x station
dir.20m	Sonic Wind Direction	deg	time x station
dir.25m	Sonic Wind Direction	deg	time x station
dir.2m	Sonic Wind Direction	deg	time x station
dir.30m	Sonic Wind Direction	deg	time x station
dir.3m	Sonic Wind Direction	deg	time x station
dir.5m	Sonic Wind Direction	deg	time x station
h2o'h2o'.5m	h2o variance	()^2	time x station
h2o.5m	Water Vapor Density		time x station
h2oraw.5m	Analyzer Output		time x station
kh2o'kh2o'.30m	kh2o variance	(g/m^3)^2	time x station
kh2o'kh2o'.5m	kh2o variance	(g/m^3)^2	time x station
kh2o.30m	Krypton-Uncorrected h2o	g/m^3	time x station
kh2o.5m	Krypton-Uncorrected h2o	g/m^3	time x station
kh2oV.30m	Krypton Output	V	time x station
kh2oV.5m	Krypton Output	V	time x station
lambdasoil	Soil Thermal Conductivity	W/(m K)	time x station
latitude	Degrees N Latitude	deg	station
longitude	Degrees E Longitude	deg	station
spd.10m	Sonic Wind Speed	m/s	time x station
spd.15m	Sonic Wind Speed	m/s	time x station
spd.1m	Sonic Wind Speed	m/s	time x station
spd.20m	Sonic Wind Speed	m/s	time x station
spd.25m	Sonic Wind Speed	m/s	time x station
spd.2m	Sonic Wind Speed	m/s	time x station
spd.30m	Sonic Wind Speed	m/s	time x station
spd.3m	Sonic Wind Speed	m/s	time x station
spd.5m	Sonic Wind Speed	m/s	time x station
spd_max.10m		m/s	time x station
spd_max.15m		m/s	time x station
spd_max.20m		m/s	time x station
spd_max.25m		m/s	time x station
spd_max.30m		m/s	time x station
spd_max.5m		m/s	time x station
tc'tc'.10m	tc variance	(degC)^2	time x station
tc'tc'.15m	tc variance	(degC)^2	time x station
tc'tc'.1m	tc variance	(degC)^2	time x station
tc'tc'.20m	tc variance	(degC)^2	time x station
tc'tc'.25m	tc variance	(degC)^2	time x station
tc'tc'.2m	tc variance	(degC)^2	time x station
tc'tc'.30m	tc variance	(degC)^2	time x station
tc'tc'.3m	tc variance	(degC)^2	time x station
tc'tc'.5m	tc variance	(degC)^2	time x station
tc.10m	Virtual Temperature	degC	time x station
tc.15m	Virtual Temperature	degC	time x station
tc.1m	Virtual Temperature	degC	time x station
tc.20m	Virtual Temperature	degC	time x station
tc.25m	Virtual Temperature	degC	time x station
tc.2m	Virtual Temperature	degC	time x station
tc.30m	Virtual Temperature	degC	time x station
tc.3m	Virtual Temperature	degC	time x station
tc.5m	Virtual Temperature	degC	time x station
tcflag.10m	Spike fract for tc		time x station
tcflag.15m	Spike fract for tc		time x station
tcflag.1m	Spike fract for tc		time x station
tcflag.20m	Spike fract for tc		time x station
tcflag.25m	Spike fract for tc		time x station
tcflag.2m	Spike fract for tc		time x station
tcflag.30m	Spike fract for tc		time x station
tcflag.3m	Spike fract for tc		time x station
tcflag.5m	Spike fract for tc		time x station
u'co2'.5m	u co2 covariance	m/s mmole/m^3	time x station
u'h2o'.5m	u h2o covariance	m/s	time x station
u'kh2o'.30m	u kh2o covariance	m/s g/m^3	time x station
u'kh2o'.5m	u kh2o covariance	m/s g/m^3	time x station
u'tc'.10m	u tc covariance	m/s degC	time x station
u'tc'.15m	u tc covariance	m/s degC	time x station
u'tc'.1m	u tc covariance	m/s degC	time x station
u'tc'.20m	u tc covariance	m/s degC	time x station
u'tc'.25m	u tc covariance	m/s degC	time x station
u'tc'.2m	u tc covariance	m/s degC	time x station
u'tc'.30m	u tc covariance	m/s degC	time x station
u'tc'.3m	u tc covariance	m/s degC	time x station
u'tc'.5m	u tc covariance	m/s degC	time x station
u'u'.10m	u variance	(m/s)^2	time x station
u'u'.15m	u variance	(m/s)^2	time x station
u'u'.1m	u variance	(m/s)^2	time x station
u'u'.20m	u variance	(m/s)^2	time x station
u'u'.25m	u variance	(m/s)^2	time x station
u'u'.2m	u variance	(m/s)^2	time x station
u'u'.30m	u variance	(m/s)^2	time x station
u'u'.3m	u variance	(m/s)^2	time x station
u'u'.5m	u variance	(m/s)^2	time x station
u'v'.10m	u v covariance	(m/s)^2	time x station
u'v'.15m	u v covariance	(m/s)^2	time x station
u'v'.1m	u v covariance	(m/s)^2	time x station
u'v'.20m	u v covariance	(m/s)^2	time x station
u'v'.25m	u v covariance	(m/s)^2	time x station
u'v'.2m	u v covariance	(m/s)^2	time x station
u'v'.30m	u v covariance	(m/s)^2	time x station
u'v'.3m	u v covariance	(m/s)^2	time x station
u'v'.5m	u v covariance	(m/s)^2	time x station
u'w'.10m	u w covariance	(m/s)^2	time x station
u'w'.15m	u w covariance	(m/s)^2	time x station
u'w'.1m	u w covariance	(m/s)^2	time x station
u'w'.20m	u w covariance	(m/s)^2	time x station
u'w'.25m	u w covariance	(m/s)^2	time x station
u'w'.2m	u w covariance	(m/s)^2	time x station
u'w'.30m	u w covariance	(m/s)^2	time x station
u'w'.3m	u w covariance	(m/s)^2	time x station
u'w'.5m	u w covariance	(m/s)^2	time x station
u.10m	Sonic U Wind Comp	m/s	time x station
u.15m	Sonic U Wind Comp	m/s	time x station
u.1m	Sonic U Wind Comp	m/s	time x station
u.20m	Sonic U Wind Comp	m/s	time x station
u.25m	Sonic U Wind Comp	m/s	time x station
u.2m	Sonic U Wind Comp	m/s	time x station
u.30m	Sonic U Wind Comp	m/s	time x station
u.3m	Sonic U Wind Comp	m/s	time x station
u.5m	Sonic U Wind Comp	m/s	time x station
uflag.10m	Spike fract for u		time x station
uflag.15m	Spike fract for u		time x station
uflag.1m	Spike fract for u		time x station
uflag.20m	Spike fract for u		time x station
uflag.25m	Spike fract for u		time x station
uflag.2m	Spike fract for u		time x station
uflag.30m	Spike fract for u		time x station
uflag.3m	Spike fract for u		time x station
uflag.5m	Spike fract for u		time x station
v'co2'.5m	v co2 covariance	m/s mmole/m^3	time x station
v'h2o'.5m	v h2o covariance	m/s	time x station
v'kh2o'.30m	v kh2o covariance	m/s g/m^3	time x station
v'kh2o'.5m	v kh2o covariance	m/s g/m^3	time x station
v'tc'.10m	v tc covariance	m/s degC	time x station
v'tc'.15m	v tc covariance	m/s degC	time x station
v'tc'.1m	v tc covariance	m/s degC	time x station
v'tc'.20m	v tc covariance	m/s degC	time x station
v'tc'.25m	v tc covariance	m/s degC	time x station
v'tc'.2m	v tc covariance	m/s degC	time x station
v'tc'.30m	v tc covariance	m/s degC	time x station
v'tc'.3m	v tc covariance	m/s degC	time x station
v'tc'.5m	v tc covariance	m/s degC	time x station
v'v'.10m	v variance	(m/s)^2	time x station
v'v'.15m	v variance	(m/s)^2	time x station
v'v'.1m	v variance	(m/s)^2	time x station
v'v'.20m	v variance	(m/s)^2	time x station
v'v'.25m	v variance	(m/s)^2	time x station
v'v'.2m	v variance	(m/s)^2	time x station
v'v'.30m	v variance	(m/s)^2	time x station
v'v'.3m	v variance	(m/s)^2	time x station
v'v'.5m	v variance	(m/s)^2	time x station
v'w'.10m	v w covariance	(m/s)^2	time x station
v'w'.15m	v w covariance	(m/s)^2	time x station
v'w'.1m	v w covariance	(m/s)^2	time x station
v'w'.20m	v w covariance	(m/s)^2	time x station
v'w'.25m	v w covariance	(m/s)^2	time x station
v'w'.2m	v w covariance	(m/s)^2	time x station
v'w'.30m	v w covariance	(m/s)^2	time x station
v'w'.3m	v w covariance	(m/s)^2	time x station
v'w'.5m	v w covariance	(m/s)^2	time x station
v.10m	Sonic V Wind Comp	m/s	time x station
v.15m	Sonic V Wind Comp	m/s	time x station
v.1m	Sonic V Wind Comp	m/s	time x station
v.20m	Sonic V Wind Comp	m/s	time x station
v.25m	Sonic V Wind Comp	m/s	time x station
v.2m	Sonic V Wind Comp	m/s	time x station
v.30m	Sonic V Wind Comp	m/s	time x station
v.3m	Sonic V Wind Comp	m/s	time x station
v.5m	Sonic V Wind Comp	m/s	time x station
vflag.10m	Spike fract for v		time x station
vflag.15m	Spike fract for v		time x station
vflag.1m	Spike fract for v		time x station
vflag.20m	Spike fract for v		time x station
vflag.25m	Spike fract for v		time x station
vflag.2m	Spike fract for v		time x station
vflag.30m	Spike fract for v		time x station
vflag.3m	Spike fract for v		time x station
vflag.5m	Spike fract for v		time x station
w'co2'.5m	w co2 covariance	m/s mmole/m^3	time x station
w'h2o'.30m	w h2o covariance	m/s g/m^3	time x station
w'h2o'.5m	w h2o covariance	m/s	time x station
w'kh2o'.30m	w kh2o covariance	m/s g/m^3	time x station
w'kh2o'.5m	w kh2o covariance	m/s g/m^3	time x station
w't'.30m	w t covariance	m/s degK	time x station
w't'.5m	w t covariance	m/s degK	time x station
w'tc'.10m	w tc covariance	m/s degC	time x station
w'tc'.15m	w tc covariance	m/s degC	time x station
w'tc'.1m	w tc covariance	m/s degC	time x station
w'tc'.20m	w tc covariance	m/s degC	time x station
w'tc'.25m	w tc covariance	m/s degC	time x station
w'tc'.2m	w tc covariance	m/s degC	time x station
w'tc'.30m	w tc covariance	m/s degC	time x station
w'tc'.3m	w tc covariance	m/s degC	time x station
w'tc'.5m	w tc covariance	m/s degC	time x station
w'w'.10m	w variance	(m/s)^2	time x station
w'w'.15m	w variance	(m/s)^2	time x station
w'w'.1m	w variance	(m/s)^2	time x station
w'w'.20m	w variance	(m/s)^2	time x station
w'w'.25m	w variance	(m/s)^2	time x station
w'w'.2m	w variance	(m/s)^2	time x station
w'w'.30m	w variance	(m/s)^2	time x station
w'w'.3m	w variance	(m/s)^2	time x station
w'w'.5m	w variance	(m/s)^2	time x station
w.10m	Sonic W Wind Comp	m/s	time x station
w.15m	Sonic W Wind Comp	m/s	time x station
w.1m	Sonic W Wind Comp	m/s	time x station
w.20m	Sonic W Wind Comp	m/s	time x station
w.25m	Sonic W Wind Comp	m/s	time x station
w.2m	Sonic W Wind Comp	m/s	time x station
w.30m	Sonic W Wind Comp	m/s	time x station
w.3m	Sonic W Wind Comp	m/s	time x station
w.5m	Sonic W Wind Comp	m/s	time x station
wflag.10m	Spike fract for w		time x station
wflag.15m	Spike fract for w		time x station
wflag.1m	Spike fract for w		time x station
wflag.20m	Spike fract for w		time x station
wflag.25m	Spike fract for w		time x station
wflag.2m	Spike fract for w		time x station
wflag.30m	Spike fract for w		time x station
wflag.3m	Spike fract for w		time x station
wflag.5m	Spike fract for w		time x station