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Five portable Bruker EM27/SUN FTIR (Fourier transform infrared)spectrometers have been used for the accurate and precise observation ofcolumn-averaged abundances of CO2 and CH4 around the major cityBerlin. In the work by Frey et al. (2015), a calibration procedure isdeveloped and applied to the set of spectrometers used for the Berlincampaign. Here, we describe the observational setup of the campaign andaspects of the data analysis, and we present the recorded time series ofXCH4 and XCO2. We demonstrate that the CO2 emissions ofBerlin can be clearly identified in the observations. A simple dispersionmodel is applied which indicates a total strength of the Berlin source ofabout 0.8 t CO2 s−1.In the Supplement of thiswork, we provide the measured data set and auxiliary data. We hope that themodel community will exploit this unique data set for state-of-the artinversion studies of CO2 and CH4 sources in the Berlin area

Application of portable FTIR spectrometers for detecting greenhouse gas emissions of the major city Berlin