European Fluxes Database Cluster

Variables and formats available

Continuous Level2 data

Level2 data are original data submitted by the PI and checked/filtered only for out-of-range values or clearly wrong data. The variables available are listed in the table here below and are provided as ASCII file with missing values reported as -9999 and timestamp indicating the end of the averaging period. The file produced has in the first line the variables codes.



Drag a column header and drop it here to group by that column
ALBAlbedo %
APARAbsorbed PAR (400-700 nm)umol m-2 s-1
CH4Methane concentrationppb
CO2CO2 concentration ppm
D_SNOWSnow depth cm
FCCO2 flux umolCO2 m-2 s-1
FC_CMBNEE measured using transparent chambersumolCO2 m-2 s-2
FC_SSITC_TESTQuality check - CO2 flux (0=high, 1=medium, 2=low quality)adimensional
FCH4Methane (CH4) fluxnmol m-2 s-1
FCH4_CMBMethane flux measured using chambersnmol m-2 s-1
FETCH_70Fetch at which footprint cumulated probability is 70%m
FETCH_90Fetch at which footprint cumulated probability is 90%m
FETCH_FILTERQuality check -footprint (0=Fetch70 outside target area; 1=can be used, 0=measurement with footprint contaminations)adimensional
FETCH_MAXFetch at which footprint cumulated probability is maximum m
FN2ONitrous oxide (N2O) flux nmol m-2 s-1
FN2O_CMBNitrous oxide flux measured using chambersnmol m-2 s-1
FNONitric oxide (NO) flux nmol m-2 s-1
FNO_CMBNO flux measured using chambersnmol m-2 s-1
FNO2Nitrogen dioxide (NO2) flux nmol m-2 s-1
FNO2_CMBNO2 flux measured using chambersnmol m-2 s-1
FO3Ozone (O3) flux nmol m-2 s-1
GSoil heat flux W m-2
HSensible heat fluxW m-2
H_SSITC_TESTQuality check - sensible heat flux (0=high, 1=medium, 2=low quality)adimensional
H2OWater (H2O) vapor mole fractionmmolH2O mol-1
LELatent heat flux W m-2
LE_SSITC_TESTQuality check - latent heat flux (0=high, 1=medium, 2=low quality)adimensional
LEAF_WETLeaf wetness%
LW_INIncoming Longwave radiation (in the range from 4 to 50 micron)W m-2
LW_OUTOutgoing Longwave radiation (in the range from 4 to 50 micron)W m-2
MO_LENGTHMonin-Obhukov length m
NDVINormalized Difference Vegetation Index adimensional
NEE_PINet Ecosystem Exchange submitted by PI umolCO2 m-2 s-1
NETRADNet radiation (including SW and LW components)W m-2
NONO concentration ppb
NO2NO2 concentration ppb
O3O3concentration ppb
PPrecipitation mm
P_RAINRainfallmm
P_SNOWSnowfall – snow precipitationmm (or water)
PAAtmospheric pressure Kpa
PPFD_BC_INBelow canopy PPFD (400-700 nm)umol m-2 s-1
PPFD_DIFDiffuse incoming PPFD (400-700 nm)umol m-2 s-1
PPFD_DIRPhotosynthetic photon flux density, direct incomingµmol m-2 s-1
PPFD_INPhotosynthetic Photon Flux Density (400-700 nm)umol m-2 s-1
PPFD_OUTReflected PPFD (400-700 nm)umol m-2 s-1
PRIPhotochemical Reflectance Index adimensional
R_UVAUVA radiation W m-2
R_UVBUVB radiation W m-2
RHRelative humidity %
RHETHeterotrophic respiration flux umolCO2 m-2 s-1
RSSoil CO2 efflux umolCO2 m-2 s-1
RUNOFFRunoffmm
SAP_DTDifference of probes temperature for sapflow measurements°C
SAP_FLOWSapflowmmolH2O m-2 s-1
SBHeat storage in biomassW m-2
SCCO2 storage fluxumolCO2 m-2 s-1
SCH4Methane (CH4) storage fluxnmolCH4 m-2 s-1
SGHeat storage in the soil above the soil heat fluxes measurementW m-2
SHSensible heat storage fluxW m-2
SLELatent heat storage fluxW m-2
SPEC_NIR_INincoming radiation (infra-red band)umol m-2 s-1
SPEC_NIR_OUToutgoing radiation (infra-red band)umol m-2 s-1
SPEC_PRI_REF_INincoming radiation at 568 nm umol m-2 s-1
SPEC_PRI_REF_OUToutgoing radiation at 568 nm umol m-2 s-1
SPEC_PRI_TGT_INincoming radiation at 529 nm umol m-2 s-1
SPEC_PRI_TGT_OUToutgoing radiation at 529 nm umol m-2 s-1
SPEC_RED_INincoming radiation (red band)umol m-2 s-1
SPEC_RED_OUToutgoing radiation (red band)umol m-2 s-1
STEMFLOWStemflow mm
SW_BC_INBelow canopy incoming short wave radiationW m-2
SW_DIFDiffuse incoming Shortwave radiation (in the range from 0.3 to 4.5 micron)W m-2
SW_INIncoming Shortwave radiation (in the range from 0.3 to 4.5 micron)W m-2
SW_OUTOutgoing Shortwave radiation (in the range from 0.3 to 4.5 micron)W m-2
SWCSoil water content%
T_BOLEBole temperature°C
T_CANOPYCanopy temperature°C
TAAir temperature °C
TAUMomentum flux Kg m-1 s-2
TAU_SSITC_TESTQuality check - momentum flux (0=high, 1=medium, 2=low quality)adimensional
TBCTemperature below canopy °C
THROUGHFALLThroughfall mm
TRTree transpirationml hr-1
TSSoil temperature°C
U_SIGMAStandard deviation of velocity fluctuations (towards main-wind direction after coordinates rotation)m s-1
USTARFriction velocitym s-1
V_SIGMAStandard deviation of lateral velocity fluctuations (cross main-wind direction after coordinates rotation)m s-1
W_SIGMAStandard deviation of vertical velocity fluctuations m s-1
WDWind directionDecimal degree
WSWind speed m s-1
WS_MAXMaximum wind speed m s-1
WTDWater table depth m
ZLStability parameter adimensional


Level3 and Level4 data

The Level3 data are standard files with a selected number of variables with NEE calculated (Fc+Sc) and quality flags related to spikes and ustar filtering. Only flags are added and the data are not changed. The instead Level4 data are filtered, gapfilled and partitioned and aggregated at different time resolutions, from halfhourly to yearly.

The data are provided as ASCII files and as Matlab files. It is possible to download an example of Level3 and Level4 data, including the data description, here below:

Download a Level3 data file

Download a Level4 data file

Ancillary data

The ancillary data available are listed in the table below. These variables have a number of qualifiers that provide additional information (e.g. SOIL_C has as qualifier the uncertainty, the measurement depth, the reference date, possible comments…) and that are automatically added to the output file; a list of the existing qualifiers for each variable is available here. Ancillary data are provided in ASCII files with six columns:

  • idVar: it is an integer number that identifies variables and qualifiers that are linked (see below the example)

  • Variable: it is the variable code as in the table below

  • Qualifier: a parameter related to the variable (e.g. the error or the method). It is "VALUE" when the variable value is reported.

  • Value: the value of the variable or variable+qualifier; can be numeric or text depending of the nature of the qualifier

  • Date: measurement or reference date in the format YYYYMMDD can be also only YYYYMM or YYYY when needed

  • Time: time of the measurement, when relevant, in the format HHMM

In the example below it is explained how to use and interpret the idVar; supposing to have two measurements of LAI, the same day, but with different methodologies. The Qualifiers are the Value, Sigma, Technique and Comment and are present in both the measurements. The idVar helps to identify which Value, Sigma and Comment are related to the two methodologies used. In the example, the records with idVar = 16 are related to the LI-2000 technique while the LAI measured using hemispherical photos are identified by the idVar = 17. An example of Ancillary data file is available here.



Example of the idVar use

idVar,Variable,Qualifier,Value,Date,Time

......

16,LAI,VALUE,4.33,20100621,-9999

16,LAI,SIGMA,0.13,20100621,-9999

16,LAI,TECHNIQUE,LAI2000,20100621,-9999

16,LAI,COMMENT,10 measurement points in the footprint,20100621,-9999

17,LAI,VALUE,4.98,20100621,-9999

17,LAI,SIGMA,0.48,20100621,-9999

17,LAI,TECHNIQUE,HEMISPHERICAL PHOTOS,20100621,-9999

17,LAI,COMMENT,3 pictures in the footprint,20100621,-9999

......



Drag a column header and drop it here to group by that column
AG_BIOMASS_CFAboveground biomass of crops foliage. Dry weight of foliagegC m-2
AG_BIOMASS_CHAboveground biomass of crops harvest. Dry weight of harvest materials such as fruitgC m-2
AG_BIOMASS_CTAboveground biomass of crops total. Includes live foliage and harvest materialsgC m-2
AG_BIOMASS_NWTAboveground biomass of non-woody plants. Dry weight of plants including plants and forbs. Grassland sites report the total above ground biomass. Forest sites report any non-woody plants.gC m-2
AG_BIOMASS_SFAboveground biomass of shrub foliage. Dry weight of live foliagegC m-2
AG_BIOMASS_STAboveground biomass of shrubs totalgC m-2
AG_BIOMASS_SWAboveground biomass of shrub wood. Dry weight of stems and branchesgC m-2
AG_BIOMASS_TFAboveground biomass of tree foliage. Dry weight of live foliage.gC m-2
AG_BIOMASS_TTAboveground biomass trees total. Dry weight live foliage, stems, and branches.gC m-2
AG_BIOMASS_TWAboveground biomass of tree wood. Dry weight of live stems and branches.gC m-2
AG_PROD_CFAboveground production of crops foliage. Includes live foliage only. gC m-2 yr-1
AG_PROD_CHAboveground production of crops harvest. Includes agricultural crops harvest materials such as friutgC m-2 yr-1
AG_PROD_CTAboveground production of crops total. Includes foliage and harvest materialsgC m-2 yr-1
AG_PROD_NWTAboveground production of non-woody plants. Dry weight of plants including plants and forbs. Grass sites report the total above ground biomass. Forest sites report any non-woody plants.gC m-2 yr-1
AG_PROD_SFAboveground production of shrub foliage. Includes foliage onlygC m-2 yr-1
AG_PROD_STAboveground production of shrub totalgC m-2 yr-1
AG_PROD_SWAboveground production of shrub wood. Inlcudes stems and branchesgC m-2 yr-1
AG_PROD_TFAboveground production of tree foliage. Includes overstory foliage only.gC m-2 yr-1
AG_PROD_TTAboveground production of tree total. Includes overstory foliage, stems, and branches.gC m-2 yr-1
AG_PROD_TWAboveground production of tree wood. Includes overstory stems and branches.gC m-2 yr-1
ASAMean stand age in yearsyears
CLAY_PERCClay content%
CR_BIOMASSCoarse root biomass (live)gC m-2
CR_PRODCoarse root productiongC m-2 yr-1
CROP_RESIDCrop residue. Dead mass dry weightgC m-2 yr-1
CWDCoarse woody debris. Includes debris with diameter >10 cmgC m-2
FOL_NFoliage nitrogen concentrationgN/100g foliar mass
FOL_CFoliage carbon concentrationgC/100g foliar mass
FR_BIOMASSFine root biomass (live)gC m-2
FR_PRODFine root productiongC m-2 yr-1
FWDFine woody debris. Includes debris with diameters 1cm - 10cmgC m-2
HEIGHTCCanopy heightm
LAILeaf Area Index. Averaged over the tower footprint. Calculated as m2 half-surface area leaf per m2 ground. Report green leaf LAI and not total leaf LAI.m2 m-2
LAI_DODeciduous overstory Leaf Area Index. Averaged over the tower footprintm2 m-2
LAI_EOEvergreen overstory Leaf Area Index. Averaged over the tower footprintm2 m-2
LAI_UUnderstory Leaf Area Indexm2 m-2
LIT_MASSLitter mass. Dry weight including litter and twigs < 1 cm diameter.gC m-2
LIT_NLitter nitrogen concentrationgN/100g litter
LIT_CLitter carbon concentrationgC/100g litter
LIT_PRODLitterfall. Leaf litter and twigs < 1cm diameter. Sampled periodically through the year, dried and weighed and summed over yeargC m-2 yr-1
LMALeaf mass per unit leaf areagC m-2
MSAMaximum stand age. Calculated as the mean age of the oldest 10% of treesyears
NEPNet ecosystem production. Computed from biological measurementsgC m-2 yr-1
ROCK_PERCRock content%
ROOT_NRoot nitrogen concentrationgN/100g
ROOT_CRoot carbon concentrationgC/100g
RsSite specific mean soil CO2 effluxumol m-2 s-1
RT_BIOMASSTotal root biomass (live)gC m-2
RT_PRODTotal root productiongC m-2 yr-1
SAND_PERCSand content%
SILT_PERCSilt content%
SNAGMass of standing dead trees. Dry weightgC m-2
SOIL_BDSoil bulk density%
SOIL_CSoil organic carbon. Percent by mass.Kg m-2
SOIL_DEPTHSoil depthm
SOIL_NSoil nitrogen contentKg m-2
SOIL_PHSoil PH. Total soil PH as CaCl2decimal number
SOIL_WATER_CAPSoil water holding capacitymm
SPP_OOverstory dominant speciesNRCS code or scientific
SPP_UUnderstory dominant speciesNRCS code or scientific
ST_MASSStump mass. Dry weightgC m-2
WOOD_INCRWood radial incrementmm
WOOD_NWoody tissue nitrogen concentrationgN/100g dry weight
WOOD_CWoody tissue carbon concentrationgC/100g dry weight