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Fig 1.
The locations of sampling sites in the urban areas (GL, KRK) and in the remote mountain background environment (KW). GL, Gliwice; KRK, Kraków; KW, Kasprowy Wierch.
Fig 2.
Comparison of the air temperature fluctuation (average, minimal and maximal values) in Gliwice and Kraków since August 2022 until March 2023 (database: IMiGW, meteo.fis.agh.edu.pl, http://www.hydrowskaz.pl/).
Fig 3.
The contributions of biogenic components to the CO2 air mole fraction observed in Gliwice and Krakow for 2021, based on biospheric model simulation. The contributions from natural fluxes have been split into the uptake of CO2 by photosynthesis – bio.gee – and release of CO2 by respiration – bio.resp (data from https://stilt.icos-cp.eu/viewer/).
Fig 4.
The contributions of anthropogenic emissions from different sectors to the CO2 air mole fraction observed in Gliwice and Krakow for 2021 split into total fuel combustion (fuel) and emissions from different main source categories, including energy production (energy), industrial processes (industry), transportation (transport) and residential heating (res).
Fig 5.
A calibration line for the CARBOCUP CO2 analyser.
Fig 6.
Average diurnal changes of CO2 air mole fraction presented as the 2-h means in GL, KRK and KW from 1 August 2022 to 31 March 2023 and a variability of the results based on SD. GL, Gliwice; KRK, Kraków; KW, Kasprowy Wierch; SD, standard deviation.
Fig 7.
The monthly average of the CO2 air mole fraction in Gliwice, Kraków, and Kasprowy Wierch from 1 August 2022 to 31 March 2023.
Fig 8.
An example of similarities and contrasts between the diurnal temperature and CO2 air mole fraction levels in the winter and summer seasons in urban areas (Gliwice and Kraków) compared to the mountain regional background site (Kasprowy Wierch) based on (A) day-to-day (B) hour-by-hour comparisons, respectively.
Thermal conditions (minimal, maximal and mean air temperature) and mean value of the CO2 air mole fraction in Gliwice, Kraków, and Kasprowy Wierch from 1 August 2022 to 31 March 2023.