parameter, description date, date in format "yyyy-mm-dd" of the beginning of each halfmonth (1st and 16th of each month) NEE, Sum of whole day (24 hours) Net ecosystem exchange over the halfmonth period in gC.m-2.halfmonth-1; can be negative or positive GPP, Sum of whole day (24 hours) Gross primary production over the halfmonth period in gC.m-2.halfmonth-1; assumed always negative Reco, Sum of whole day (24 hours) Ecosystem respiration over the halfmonth period in gC.m-2.halfmonth-1 Rg, Sum of global radiation over the halfmonth period in MJ.m-2.halfmonth-1 Tair_midday, half-monthly average of midday (11am to 4pm) air temperature at 2m height over the halfmonth period in °C Tair, half-monthly average of whole day (24 hours) air temperature at 2m height over the halfmonth period in °C VPD, half-monthly average of whole day (24 hours) vapor pressure deficit over the halfmonth period in hPa EVI, half-monthly aggregates of Landsat 8-derived Enhanced Vegetation Index processed in Google earth engine; unitless SAVI, half-monthly aggregates of Landsat 8-derived Soil Adjusted Vegetation Index processed in Google earth engine; unitless LSWI, half-monthly aggregates of Landsat 8-derived Land surface water index processed in Google earth engine; unitless NDVI, half-monthly aggregates of Landsat 8-derived Normalized Difference Vegetation Index processed in Google earth engine; unitless GNDVI, half-monthly aggregates of Landsat 8-derived Green Normalized Difference Vegetation Index processed in Google earth engine; unitless