EGU23-11532
https://doi.org/10.5194/egusphere-egu23-11532
EGU General Assembly 2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

Comprehensive measurements of speciated reactive nitrogen NOy and non-methane volatile organic compounds in Tokyo

Satoshi Inomata1, Hiroshi Tanimoto1, Jun Matsumoto2, Yasuhiro Sadanaga3, and Shungo Kato4
Satoshi Inomata et al.
  • 1National Institute for Environmental Studies, Tsukuba, Japan
  • 2Waseda University, Tokorozawa, Japan
  • 3Osaka Metropolitan University, Sakai, Japan
  • 4Tokyo Metropolitan University, Hachioji, Japan

In Japan, concentrations of precursors of photochemical oxidants such as nitrogen oxides (NOx) and non-methane hydrocarbons (NMHCs) are decreasing year by year, but an improvement regarding photochemical oxidants is recently stagnant. To elucidate the reason, we have planned seasonal intensive observations in Tokyo, in which comprehensive measurements of speciated reactive nitrogen NOy and non-methane volatile organic compounds are performed. In summer of 2022, the observation was carried out at a campus of Tokyo Metropolitan University, a suburban area of Tokyo. In the intensive observation, NO, NO2, ΣPANs, ΣONs, HONO, HNO3, H2O2, SO2, O3, NH3, 28 NMHCs, and 10 oxygenated volatile organic compounds (OVOCs) were measured simultaneously. The ΣPANs and ΣONs were measured by thermal dissociation-cavity attenuated phase shift (CAPS) spectroscopy. The HONO, HNO3, and H2O2 were measured by negative ion chemical ionization mass spectrometry using I·(H2O)n as the reagent ion. The NMHCs, OVOCs and NH3 were measured by selected ion flow tube mass spectrometry and the data of NMHCs were compared and corrected with the data from gas chromatography/flame ionization detector (GC/FID). The ozone formation in Tokyo will be discussed.

How to cite: Inomata, S., Tanimoto, H., Matsumoto, J., Sadanaga, Y., and Kato, S.: Comprehensive measurements of speciated reactive nitrogen NOy and non-methane volatile organic compounds in Tokyo, EGU General Assembly 2023, Vienna, Austria, 24–28 Apr 2023, EGU23-11532, https://doi.org/10.5194/egusphere-egu23-11532, 2023.