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Observations of urban NOx plume dispersion using mobile and satellite DOAS measurements around the megacity of St.Petersburg (Russia)

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Mobile DOAS (Differential Optical Absorption Spectroscopy) circular measurements of tropospheric nitrogen dioxide (NO2) were performed on a number of days in 2012 and 2014–2016 around St.Petersburg. These observations figured out an evolution of urban pollution plume, released from the megacity. The HYSPLIT (HYbrid Single-Particle Lagrangian Integrated Trajectories) model was configured to simulate the observed NO2 dispersion, taking into account the municipal inventory database of urban nitrogen oxides (NOx = NO+ NO2) emission. The simulation results were found consistent with the data of mobile measurements, allowing to fit an estimate of integral NOx emission rate from St.Petersburg (about 60 kt year−1 on the average). Coincident satellite measurements the Aura Ozone Monitoring Instrument (OMI) of tropospheric NO2 mostly agree with the data of simulation on the days of mobile observations. In general, presented results demonstrate the capabilities of joint interpretation of disparate tropospheric NO2 data in the vicinity of a megacity.
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Document Type: Research Article

Affiliations: Department of Atmospheric Physics, St. Petersburg State University, St.Petersburg, Russia

Publication date: January 17, 2019

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