Quantification of NOx emission from St Petersburg (Russia) using mobile DOAS measurements around the entire city
2015
Ionov, Dmitry | Poberovskii, Anatoly
We present mobile differential optical absorption spectroscopy (DOAS) zenith-sky observations of tropospheric NO ₂ from field experiments carried out at St Petersburg (Russia) on a number of days during May–October of 2009–2012. We conducted a detailed analysis of our measurements on a closed route around the entire city that took place on 14 August 2012. We used the data from these circular observations to derive our top–down estimate of total NO ₓ emission from St Petersburg on that day, i.e. (12.6 ± 2.4) ×10 ²⁴ molecules s ⁻¹. This value, if assumed to be constant throughout the year, would correspond to a total emission rate of (31 ± 6) kt/year (calculated on condition that all NO ₓ was NO ₂). Our estimate is half of that reported in a published official inventory of St Petersburg (63 kt/year). Possible reasons for that discrepancy and an outlook for further improvements are considered and discussed further.
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