EGU23-3091, updated on 22 Feb 2023
https://doi.org/10.5194/egusphere-egu23-3091
EGU General Assembly 2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

Modeling nitryl chloride and its source and effect on gaseous and aerosol chemistry

Hyeonmmin Kim1, Rokjin Park1, Jean Jeong1, Saewung Kim2, Daun Jeong2, Xiao Fu3, and Seogju Cho4
Hyeonmmin Kim et al.
  • 1School of Earth and Environmental Sciences, College of Natural Sciences, Seoul National University, Korea, Republic of (khm0601s@snu.ac.kr)
  • 2Department of Earth System Science, School of Physical Sciences, University of California, Irvine, USA
  • 3Department of Civil and Environmental Engineering, Hong Kong Polytechnic University, Hong Kong 99907, China
  • 4Seoul Metropolitan Government Research Institute of Public Health and Environment, Seoul, Korea

Nitryl chloride (ClNO2) has been reported as a critical species of chlorine chemistry. Its chemistry interrupts a nighttime sink of NOX and emits chlorine radical (Cl•) in the daytime, consequently altering gaseous and aerosol chemistry. Recent field studies have also measured considerable concentrations of ClNO2 in South Korea under the influences of natural and anthropogenic chlorine sources. However, the impacts of ClNO2 chemistry on air quality in South Korea have yet to be evaluated. We validate simulated ClNO2 and its chemistry in South Korea using observations and a 3-D chemical transport model (CTM) during the Korea-United States Air Quality field study. We implemented the latest Chinese and Korean anthropogenic chlorine emissions in the model. We found that the model reproduces the observed spatial and temporal variations of ClNO2, including its local and transboundary transport and precursors. We found that ClNO2 chemistry results in a more efficient conversion of NO to NO2 at night and daytime acceleration of the NOX-O3 cycle. It results in an increase of O3 (1.1%), NOX (3.1%), OH (2.0%), HO2 (0.8%), and Cl• (507.8%) and a decrease of TNO3(HNO3 + aerosol nitrate, 1.7%) on the campaign mean basis.

How to cite: Kim, H., Park, R., Jeong, J., Kim, S., Jeong, D., Fu, X., and Cho, S.: Modeling nitryl chloride and its source and effect on gaseous and aerosol chemistry, EGU General Assembly 2023, Vienna, Austria, 24–28 Apr 2023, EGU23-3091, https://doi.org/10.5194/egusphere-egu23-3091, 2023.