EGU General Assembly 2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

Impact of convection on trace gas composition during the summer monsoon season downwind of East Asia and over central North America

Elliot Atlas1, Kate Smith1, Victoria Treadaway1,3, Sue Schauffler1,2, Roger Hendershot1,2, Richard Lueb1,2, Stephen Donnelly1, Leslie Pope1, Laura Pan2, Troy Thornberry3, Paul Newman4, Ken Bowman5, and the ACCLIP and DCOTSS Science Teams*
Elliot Atlas et al.
  • 1Rosenstiel School of Marine, Earth, and Atmospheric Science, University of Miami, Miami, United States of America
  • 2Atmospheric Chemistry Observations and Modeling, National Center for Atmospheric Research, Boulder, United States of America
  • 3Chemical Sciences Laboratory, NOAA, Boulder, United States of America
  • 4Goddard Space Flight Center, NASA, Greenbelt, United States of America
  • 5Atmospheric Sciences, Texas A&M University, College Station, United States of America
  • *A full list of authors appears at the end of the abstract

Airborne research missions were conducted during the summer season over the Western Pacific downwind of the Asian summer monsoon (ACCLIP, Asian Summer Monsoon Chemical & CLimate Impact Project, Aug/Sept., 2022) and over central N. America (DCOTSS: Dynamics and Chemistry Of The Summer Stratosphere, July/Aug., 2021 and May/July, 2022).  A major objective of both of these missions was to characterize the impact of convective transport of trace gases on regional and hemispheric air quality and on ozone chemistry in the UT/LS.  The DCOTSS campaign focused on outflow from overshooting convection, and ACCLIP targeted outflow and eddy-shedding from the Asian summer monsoon anticyclone.  Whole air samples were collected from the three aircraft deployed during the missions (NSF GV, NASA WB-57, and NASA ER2), and a wide range of organic trace gases were measured that included NMHC, long and short-lived halocarbons and organic nitrates.   In-situ measurements of ozone and other trace gases were also included in the airborne instrument payloads.  Both campaigns showed cases of tropospheric transport into UT/LS region, with significantly larger amounts of certain trace gases (e.g., dichloromethane and others) found in the ACCLIP region.  This presentation will provide an overview of selected trace gas distributions and correlations from these campaigns to illustrate the role of the different monsoon regions on the chemistry of the UT/LS.

ACCLIP and DCOTSS Science Teams:

Eric Apel, Becky Hornbrook, Alan Hills, Teresa Campos, Alessandro Franchin, Greg Huey, Doug Kinnison, Qing Liang, Ren Smith, Shawn Honomichl, Pavel Romashkin, Drew Rollins, Jim Podolske, Paul Bui, Glenn Diskin, Glenn Wolfe, Silvia Viciani, Francesco D'Amato, Steve Wofsy, Jasna Pittman, Bruce Daube, Jessica Smith, David Wilmouth, Rei Ueyama, Cameron Homeyer, Brad Hall, Eric Hintsa, James Elkins

How to cite: Atlas, E., Smith, K., Treadaway, V., Schauffler, S., Hendershot, R., Lueb, R., Donnelly, S., Pope, L., Pan, L., Thornberry, T., Newman, P., and Bowman, K. and the ACCLIP and DCOTSS Science Teams: Impact of convection on trace gas composition during the summer monsoon season downwind of East Asia and over central North America, EGU General Assembly 2023, Vienna, Austria, 24–28 Apr 2023, EGU23-4449,, 2023.