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 |
References