Preprints
https://doi.org/10.5194/acp-2020-1174
https://doi.org/10.5194/acp-2020-1174

  02 Feb 2021

02 Feb 2021

Review status: this preprint is currently under review for the journal ACP.

The CO2 integral emission by the megacity of St. Petersburg as quantified from ground-based FTIR measurements combined with dispersion modelling

Dmitry V. Ionov1, Maria V. Makarova1, Frank Hase2, Stefani C. Foka1, Vladimir S. Kostsov1, Carlos Alberti2, Thomas Blumenstock2, Thorsten Warneke3, and Yana A. Virolainen1 Dmitry V. Ionov et al.
  • 1Department of Atmospheric Physics, Faculty of Physics, St. Petersburg State University, Russia
  • 2Karlsruhe Institute of Technology (KIT), Institute of Meteorology and Climate Research (IMK-ASF), Karlsruhe, Germany
  • 3University of Bremen, Germany

Abstract. The anthropogenic impact is a major factor of the climate change which is highest in industrial regions and modern megacities. Megacities are a significant source of emissions of various substances into the atmosphere, including CO2 which is the most important anthropogenic greenhouse gas. In 2019 and 2020, the mobile experiment EMME (Emission Monitoring Mobile Experiment) was carried out on the territory of St. Petersburg which is the second largest industrial city in Russia with a population of more than 5 million people. In 2020, several measurement data sets were obtained during the lockdown period caused by the COVID-19 (COronaVIrus Disease of 2019) pandemic. One of the goals of EMME was to evaluate the CO2 emission from the St. Petersburg agglomeration. Previously, the CO2 area flux has been obtained from the data of the EMME-2019 experiment using the mass balance approach. The value of the CO2 area flux for St. Petersburg has been estimated as 89±28 kt km−2 yr−1 which is three times higher than the corresponding value reported in the official municipal inventory. The present study is focused on the derivation of the integral CO2 emission from St. Petersburg by coupling the results of the EMME observational campaigns of 2019 and 2020 and the HYSPLIT (HYbrid Single-Particle Lagrangian Integrated Trajectories) model. The ODIAC (Open-source Data Inventory for Anthropogenic CO2) database is used as the source of the a priori information on the CO2 emissions for the territory of St. Petersburg. The most important finding of the present study based on the analysis of two observational campaigns is a significantly higher CO2 emission from the megacity of St. Petersburg as compared to the data of municipal inventory: ~75800±5400 kt yr−1 for 2019, ~68400±7100 kt yr−1 for 2020 (~70000±16000 kt yr−1 during the lockdown) versus ~30000 kt yr−1 reported by official inventory. The comparison of the CO2 emissions obtained during the COVID-19 lockdown period in 2020 to the results obtained during the same period of 2019 demonstrated the decrease in emission of 8 % or 5800 kt yr−1.

Dmitry V. Ionov et al.

Status: open (until 30 Mar 2021)

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Dmitry V. Ionov et al.

Dmitry V. Ionov et al.

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Short summary
Megacities are a significant source of emissions of various substances into the atmosphere, including carbon dioxide which is the most important anthropogenic greenhouse gas. In 2019–2020, the Emission Monitoring Mobile Experiment was carried out on the territory of St. Petersburg which is the second largest industrial city in Russia. The results of this experiment coupled with numerical modelling helped to estimate the amount of CO2 emitted the city. This value was twice as high as predicted.
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