Data supporting the manuscript "Continuous fossil fuel CO2 emission estimates based on 14C-calibrated urban eddy-covariance fluxes of co-emitted species"

Half-hourly observation-based and modeled turbulent fluxes at a tall tower in Munich (DE-Opd) from 01 July 2024 to 28 February 2025. The derivation and analysis of the data is described in the following manuscript: Kunz, A., Hammer, S., Aigner, P., Borchardt, L., Chen, J., Della Coletta, J., Eritt, M., Friedrich, R., Gutiérrez, X., Hilland, R., Holst, C., Jordan, A., Kljun, N., Kneißl, R., Kühbacher, D., Lan, C., Li, J., Molinier, B., Preunkert, S., Christen, A.: Continuous fossil fuel CO2 emission estimates based on 14C-calibrated urban eddy-covariance fluxes of co-emitted species. This study was conducted within the ICOS Cities project (https://www.icos-cp.eu/projects/icos-cities). The csv file provided contains the following columns: Column name Unit Description time_start_LT LT Timestamps of the start of the 30 min averaging intervals in local time time_end_LT LT Timestamps of the end of the 30 min averaging intervals in local time time_start_UTC UTC Timestamps of the start of the 30 min averaging intervals in UTC time_end_UTC UTC Timestamps of the end of the 30 min averaging intervals in UTC FCO2 µmol m-2 s-1 CO2 flux from the MGA7 (turbulent flux + storage flux) FCO µmol m-2 s-1 CO flux from the MGA7 (turbulent flux + storage flux) FNOx µmol m-2 s-1 NO flux + NO2 flux from the MGA7 (turbulent flux + storage flux) FffCO2_CO_const µmol m-2 s-1 CO-based ffCO2 flux estimate based on a constant FCO/FffCO2 ratio FffCO2_CO_T24h µmol m-2 s-1 CO-based ffCO2 flux estimate based on an air temperature-dependent FCO/FffCO2 ratio FffCO2_NOx_const µmol m-2 s-1 NOx-based ffCO2 flux estimate based on a constant FNOx/FffCO2 ratio FffCO2_NOx_winddir µmol m-2 s-1 NOx-based ffCO2 flux estimate based on a wind direction-dependent FNOx/FffCO2 ratio FnfCO2_CO_const µmol m-2 s-1 CO-based nfCO2 flux estimate based on a constant FCO/FffCO2 ratio (FCO2 - FffCO2_CO_const) FnfCO2_CO_T24h µmol m-2 s-1 CO-based nfCO2 flux estimate based on an air temperature-dependent FCO/FffCO2 ratio (FCO2 - FffCO2_CO_T24h) FnfCO2_NOx_const µmol m-2 s-1 NOx-based nfCO2 flux estimate based on a constant FNOx/FffCO2 ratio (FCO2 - FffCO2_NOx_const) FnfCO2_NOx_winddir µmol m-2 s-1 NOx-based nfCO2 flux estimate based on a wind direction-dependent FNOx/FffCO2 ratio (FCO2 - FffCO2_NOx_winddir) qc_data - "0"/"1" for data that did not pass / that passed all EC and footprint quality control criteria working_day - "0"/"1" for weekend or public holidays / working days daytime - "0"/"1" for data between 20:00 and 07:00 LT / between 07:00 and 20:00 LT T_air °C Air temperature at LMU measurement station. Missing data from time_end_UTC 2024-08-28 12:00 to 2024-08-29 08:00, 2024-10-16 10:30, and 2024-12-03 19:30 to 2024-12-04 07:30 was filled in using air temperature measurements from the IRGASON instrument, with an offset of 1 °C added. T_air_24h °C Average T_air over the preceding 24 h. wind_dir °N Horizontal wind direction AoA ° angle of attack u* m s-1 Friction velocity CO_spikes - "0"/"1" for time periods without / with CO spikes in concentration measurements NOx_spikes - "0"/"1" for time periods without / with NOx spikes in concentration measurements qc_co2_flux - 0-1-2 qc flag from CO2 of the MGA7 qc_co_flux - 0-1-2 qc flag from CO of the MGA7 qc_no_flux - 0-1-2 qc flag from NO of the MGA7 qc_no2_flux - 0-1-2 qc flag from NO2 of the MGA7 blh_qc - "0"/"1" for time periods with boundary layer height above / below measurement height + 20m footprint_sum - Sum of the flux footprint within the administrative city boundary multiplied by 100 CO2_tot µmol m-2 s-1 Modeled net CO2 flux estimates including the footprint-weighted emission inventory (all sectors) and footprint-weighted NEE from the VPRM model CO2_ff µmol m-2 s-1 Modeled ffCO2 flux estimates from the footprint-weighted emission inventory (all sectors) CO2_nf µmol m-2 s-1 Modeled nfCO2 flux estimates including the footprint-weighted emission inventory (human respiration and nfCO2 from stationary combustion and road transport) and footprint-weighted NEE from the VPRM model NEE µmol m-2 s-1 Modeled NEE from the footprint-weighted VPRM model CO2_A ... CO2_L µmol m-2 s-1 Modeled CO2 flux estimates from the footprint-weighted emission inventory for the GNFR source sectors A - L CO2_nf_A ... CO2_nf_L µmol m-2 s-1 Modeled nfCO2 flux estimates from the footprint-weighted emission inventory for the GNFR source sectors A - L