Greenhouse gas emitted from vehicles in Seoul megacity, South Korea: Molar ratios (N2O:CO2, CH4:CO2) and stable isotopic compositions of N2O
- 1Seoul National University, College of Natural Sciences, School of Earth and Environmental Sciences, Seoul, Korea, Republic of (jeun_kim@snu.ac.kr)
- 2Center for Cryospheric Sciences, Seoul National University, Siheung 15011, South Korea
- 3Department of Biology and Wildlife, University of Alaska Fairbanks, Fairbanks, AK, USA
Quantifying greenhouse gas (GHG) emissions in the megacities is important to mitigating climate change. To characterize the vehicle emissions which is one of the largest contributors to anthropogenic greenhouse gas emissions, we collected air samples from the entry and exit points of the Sang-do Tunnel in Seoul, South Korea in 2021, and measured dry molar mixing ratios of major greenhouse gases spices emitted from vehicles (CO2, CH4, and N2O). The N2O:CO2 emission molar ratio from vehicles is 3.82 ± 0.39 × 10-5, being within a range of 1.8 – 18.7 × 10-5 previously reported in Germany, Switzerland, Sweden, and the USA. The CH4:CO2 emission molar ratio from the vehicles is 33.52 ± 0.43 × 10-5, which is significantly greater than those observed in Switzerland and the USA of 4.6 ± 0.2 × 10–5 and 15 ± 4 ×10–5, respectively. Compared with the calculated Further, we also analyzed δ15N and δ 18O values of N2O from the tunnel air. The δ15N and δ 18O values of N2O emitted from the vehicles are estimated as The newly measured data from Seoul may help us better understand greenhouse gas emissions from vehicles in megacities.
How to cite: Kim, J., Ahn, J., and Ghosh, S.: Greenhouse gas emitted from vehicles in Seoul megacity, South Korea: Molar ratios (N2O:CO2, CH4:CO2) and stable isotopic compositions of N2O, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-3330, https://doi.org/10.5194/egusphere-egu22-3330, 2022.
