One-year spatial and temporal monitoring of concentration and carbon isotopic composition of atmospheric CO2 in a Wrocław (SW Poland) city area |
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| Institution: | 1. Laboratory of Isotope Geology and Geoecology, Department Applied Geology and Geochemistry, Institute of Geological Sciences, University of Wrocław, Cybulskiego 30, 50-205 Wroclaw, Poland;2. Thünen Institute of Climate-Smart Agriculture, Bundesallee 50, 38116 Braunschweig, Germany;1. School of Engineering and Physical Science, James Cook University, Townsville, QLD, 4811, Australia;2. School of Earth and Environment, the University of Western Australia, Crawley, 6009, WA, Australia;1. The University of Auckland, School of Environment, Private Bag 92019, Auckland 1142, New Zealand;2. National Isotope Centre, GNS Science, Lower Hutt, New Zealand;3. CIRES, University of Colorado, Boulder, CO, USA |
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| Abstract: | The main aim of this study was to assess the natural and anthropogenic contributions of CO2 in the urban atmosphere of Wrocław City (SW Poland) using combined quantitative (CO2 concentrations) and qualitative analysis (δ13C of CO2). Between 21 January 2011 and 22 December 2011, 17 sampling campaigns were performed at 3-week intervals and in total 255 samples were collected. The mean CO2 concentration was 469 ± 71 ppm and the mean δ13C(CO2) was −10.8 ± 1‰.The measured δ13C(CO2) values of major end-members for two winter heating seasons (−25.7‰ in January–March of 2011 and −27.6 ‰ in October–December of 2011) and for one vegetative season (−20.4‰ in April–September of 2011) suggest soil respiration as a main source of atmospheric CO2 during the vegetative season, and a very significant impact of fossil fuel combustion during the winter heating seasons. There were significant increases of CO2 concentrations at many sampling locations after the opening of a new motorway on 31 August 2011. The authors hypothesise that the new motorway contributes to the increase of CO2 across the city. |
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