Gross primary production, simulated by the P-model for each FLUXNET 2015 Tier 1 site. The model was driven by site-specific meteorological forcing and MODIS FPAR, extracted for the pixel corresponding to the site location. The CSV files contain simulated GPP values from different model setups conducted with the P-model and used for the publication Stocker et al. Geosci. Mod. Dev. (in review). One file is given for each temporal aggregation level (daily, 8-daily, annual, spatial [= mean annual value by site], and mean seasonal cycle [= mean per day-of-year]. Each file contains output from all model setups presented in Stocker et al. (2019), as given by column setup. The data differs slightly for each file: Daily gpp_pmodel_fluxnet2015_stocker19gmd_daily.csv: sitename: A character specifying the site ID following the naming given by FLUXNET 2015. date: YYYY-MM-DD), date_start (in _8daily, YYYY-MM-DD specifying the first day of the respective 8-day period), year (in _annual, YYYY), doy (in __meanseason, specifying the day-of-year), gpp: Simulated gross primary production, in units of g C m-2 d-1 setup: A character specifying the model setup name used in Stocker et al. (2019). See also below. 8-daily gpp_pmodel_fluxnet2015_stocker19gmd_8daily.csv: sitename: A character specifying the site ID following the naming given by FLUXNET 2015. date_start : YYYY-MM-DD specifying the first day of the respective 8-day period gpp: Simulated gross primary production, in units of g C m-2 d-1 setup: A character specifying the model setup name used in Stocker et al. (2019). See also below. Annual gpp_pmodel_fluxnet2015_stocker19gmd_annual.csv: sitename: A character specifying the site ID following the naming given by FLUXNET 2015. year: YYYY gpp: Simulated gross primary production, in units of g C m-2 yr-1 setup: A character specifying the model setup name used in Stocker et al. (2019). See also below. Spatial gpp_pmodel_fluxnet2015_stocker19gmd_spatial.csv: sitename: A character specifying the site ID following the naming given by FLUXNET 2015. gpp: Simulated gross primary production, in units of g C m-2 yr-1 setup: A character specifying the model setup name used in Stocker et al. (2019). See also below. Mean seasonal cycle gpp_pmodel_fluxnet2015_stocker19gmd_meanseason.csv: sitename: A character specifying the site ID following the naming given by FLUXNET 2015. doy: day-of-year gpp: Simulated gross primary production, in units of g C m-2 d-1 setup: A character specifying the model setup name used in Stocker et al. (2019). See also below.