The two files 'ESLMa_MainTower' and 'ESLMa_SubCanopy' contain half-hourly, pre-processed eddy covariance data of the main tower
and the subcanopy tower, respectively, of the site ES-LMa (Las Majadas). The time period is December 2015 - February 2018.

Variable names and units:

year      Year of measurement
month     Month of measurement
doy       Day of year
hour      Hour (0 - 23.5)
Tair      Air temperature (degC)
PPFD      Photosynthetic photon flux density (umol m-2 s-1)
VPD       Vapor pressure deficit (kPa) 
pressure  Atmospheric pressure (kPa) 
precip    Precipitation (mm) 
ustar     Friction velocity (m s-1)
wind      Horizontal wind velocity (m s-1)
Ca        CO2 concentration (ppm)
LW_up     Upward longwave radiation (W m-2) 
LW_down   Downward longwave radiation (W m-2) 
Rn        Net radiation (W m-2)
LE        Latent heat flux (W m-2)
LE_qc     Quality control of LE
H         Sensible heat flux (W m-2)
H_qc      Quality control of H
G         Ground heat flux (W m-2)
NEE       Net ecosystem exchange (umol m-2 s-1) 
NEE_qc    Quality control of NEE
GPP       Gross primary productivity from nighttime partitioning (umol m-2 s-1) 
GPP_qc    Quality control of GPP
Reco      Ecosystem respiration from nighttime partitioning (umol m-2 s-1)


Note that the datasets do not contain quality control (qc) information for the meteorological variables (Tair, PPFD, VPD, precip, wind, Ca). 
All data of these variables can be considered as good quality data.