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Observations of atmospheric CO2 mole fraction and the13C ∕ 12C ratio (expressed as δ13C) in urban airsheds provide constraints on the roles of anthropogenic and naturalsources and sinks in local and regional carbon cycles. In this study, wereport observations of these quantities in Nanjing at hourly intervals fromMarch 2013 to August 2015, using a laser-based optical instrument. Nanjing isthe second largest city located in the highly industrialized Yangtze RiverDelta (YRD), eastern China. The mean CO2 mole fraction andδ13C were (439.7 ± 7.5) µmol mol−1 and (−8.48 ± 0.56) ‰ over this observational period. The peak monthly mean δ13C (−7.44 ‰, July 2013) was 0.74 ‰ higher than that observed at Mount Waliguan, a WMO (World Meteorological Organization) baseline site on the Tibetan Plateau and upwind of the YRD region. The highly 13C-enriched signal was partly attributed to the influence of cement production in the region. By applying the Miller–Tans method to nighttime and daytime observations to represent signals from the city of Nanjing and the YRD, respectively, we showed that the 13C ∕ 12C ratio of CO2 sources in the Nanjing municipality was (0.21 ± 0.53) ‰ lowerthan that in the YRD. Flux partitioning calculations revealed that naturalecosystems in the YRD were a negligibly small source of atmospheric CO2

atmospheric chemistry and physics

Interpreting the &amp;lt;sup&amp;gt;13&amp;lt;/sup&amp;gt;C ∕ &amp;lt;sup&amp;gt;12&amp;lt;/sup&amp;gt;C ratio of carbon dioxide in an urban airshed in the Yangtze River Delta, China