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Discussion papers
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 27 Nov 2018

Submitted as: research article | 27 Nov 2018

Review status
This discussion paper is a preprint. A revision of the manuscript was accepted for the journal Atmospheric Chemistry and Physics (ACP).

Integration of Airborne and Ground Observations of Nitryl Chloride in the Seoul Metropolitan Area and the Implications on Regional Oxidation Capacity During KORUS-AQ 2016

Daun Jeong1, Roger Seco1, Dasa Gu1, Youngro Lee2, Benjamin A. Nault3,4, Christoph J. Knote5, Tom Mcgee6, John T. Sullivan6, Jose L. Jimenez3,4, Pedro Campuzano-Jost3,4, Donald R. Blake1, Dianne Sanchez1, Alex B. Guenther1, David Tanner2, L. Gregory Huey2, Russell Long7, Bruce E. Anderson8, Samuel R. Hall9, Kirk Ullmann9, Hye-Jung Shin10, Scott C. Herndon11, Youngjae Lee10, Danbi Kim10, Joonyoung Ahn10, and Saewung Kim1 Daun Jeong et al.
  • 1Department of Earth System Science, University of California, Irvine, Irvine, CA, USA
  • 2School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, USA
  • 3Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA
  • 4Department of Chemistry, University of Colorado, Boulder, CO, USA
  • 5Meteorologisches Institut, Ludwig-Maximilians-Universität München, München, Germany
  • 6Chemistry and Dynamics Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, USA
  • 7Office of Research and Development, U.S. EPA, Research Triangle Park, NC, USA
  • 8NASA Langley Research Center, Hampton, VA, USA
  • 9National Center for Atmospheric Research, Boulder, CO, USA
  • 10National Institute of Environmental Research, Incheon, South Korea
  • 11Aerodyne Research Inc., Billerica, MA, United States

Abstract. Nitryl chloride (ClNO2) is a radical reservoir species that releases chlorine radicals upon photolysis. An integrated analysis of the impact of ClNO2 on regional photochemistry in the Seoul Metropolitan Area (SMA) during the Korean-United States-Air Quality (KORUS-AQ) 2016 field campaign is presented. Comprehensive multiplatform observations were conducted aboard the NASA DC-8 and at two ground sites (Olympic Park, OP; Taehwa Research Forest, TRF), representing an urbanized area and a forested region downwind, respectively. The overall diurnal variations of ClNO2 in both sites appeared similar but the night time variation were systematically different. For about half of the observation days at the OP site the level of ClNO2 increased at sunset but rapidly decreased at around midnight. On the other hand, high levels were sustained throughout the night at the TRF site. Significant levels of ClNO2 were sustained at both sites for 4–5 hours after sunrise. Airborne observations, box model calculations, and back trajectory analysis consistently show that this high levels of ClNO2 in the morning is likely due to the transport of air masses within the boundary layer. Box model results show that chlorine radical initiated chemistry can impact the regional photochemistry by elevating net ozone production rate up to ~ 25 % in the morning.

Daun Jeong et al.
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Status: final response (author comments only)
Status: final response (author comments only)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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