Variable Abbreviations


This list gives an overview of variables commonly used in eddy covariance ecosystem research. Includes variables from ICOS, Ameriflux, FLUXNET, EddyPro, ReddyProc and others.

List updated: 3 May 2022

 

Variable List

wdt_ID LABEL DESCRIPTION UNIT (preferred) or FORMAT USED IN
520 air_molar_volume Molar volume of ambient air, Air properties m3 mol-1 EddyPro
679 IRGA75 Open-path IRGA Li-7500 -
678 IRGA72 Enclosed-path IRGA Li-7200 -
677 IRGA70 IRGA LI-7000 -
666 HS50 Sonic anemometer Gill HS-50 -
665 HS100 Sonic anemometer Gill HS-100 -
664 HOUR 2 digit hour of the day HH
663 HEAT_ Heating (prefix, e.g. for sonic heating)
661 H2O_QCL_EC H2O concentration from QCL for eddy system ppb (nmol H2O mol-1)
662 H2O_SIGMA Standard deviation of water vapor mole fraction mmolH2O mol-1 Ameriflux
716 NO Nitric oxide (NO) mole fraction in wet air nmolNO mol-1 Ameriflux
715 NH4 Ammonium concentration µg g-1 soil
714 NETRAD Net Radiation W m-2
713 NEE Net ecosystem exchange of CO2 µmol CO2 m-2 s-1 Fluxes
658 H2O_IRGA75_EC H2O concentration from IRGA Li-7500 for eddy system mmol H2O mol-1
651 H2O_IRGA70_CMB H2O concentration from IRGA Li-7000 for chamber system mmol H2O mol-1
623 FP_E0 activation energy parameter (K) in relationship between temperature and nighttime NEE from day-time partitioning ReddyProc
624 FP_GPP2000 GPP at incoming radiation of 2000 Wm-2, more robust alternative to saturation FP_k ReddyProc
625 FP_k parameter controlling the VPD limitation of GPP (daytime partitioning) (daytime partitioning) ReddyProc
626 FP_qc quality flag of the estimated parameters: 0: good parameter fit, 1: some parameters out of range, required refit, 2: next parameter estimate is more than two weeks away (daytime partitioning) ReddyProc
627 FP_qc quality flag of day-time partitioning: 0: good parameter fit, 1: some parameters LRC parameters were out of range, required refit, 2: next parameter estimate is more than two weeks away ReddyProc
628 FP_RRef respiration at reference temperature parameter (μmol m-2 s-1 as NEE) in relationship between temperature and nighttime NEE from day-time partitioning μmol m-2 s-1 ReddyProc
629 FP_RRef_Night same as FP_RRef using the same FP_E0, but from intermedate step based on night-time data ReddyProc
630 G Soil heat flux W m-2 Ameriflux
631 gas_def_timelag Flag: whether the reported time lag is the default (T) or calculated (F), Gas densities, concentrations and time lags T/F EddyPro
LABEL DESCRIPTION UNIT (preferred) or FORMAT USED IN

 

References