Updates to the contribution of VSL species to stratospheric Bry
Pam Wales1, Ross J Salawitch2, Timothy P Canty3, Raid M M Suleiman4, Kelly Chance4, Richard D McPeters5, Pawan K Bhartia6, Thomas p Kurosu7, George H Mount8, Elena Spinei Lind9, Alexander Cede10, William R Simpson11, Deanna Donohoue12, Bryan Johnson13, Douglas Edward Kinnison14 and Simone Tilmes15, (1)University of Maryland College Park, College Park, United States, (2)University of Maryland College Park, Department of Chemistry and Biochemistry, College Park, MD, United States, (3)University of Maryland, College Park, Department of Atmospheric and Oceanic Science, College Park, United States, (4)Atomic and Molecular Physics Division, Center for Astrophysics | Harvard & Smithsonian, Cambridge, United States, (5)NASA Goddard SFC, Greenbelt, MD, United States, (6)NASA Goddard Space Flight Center, Greenbelt, MD, United States, (7)Jet Propulsion Laboratory, California Institute of Technology, Pasadena, United States, (8)Washington State Univ, Pullman, WA, United States, (9)Virginia Polytechnic Institute and State University, Electrical and Computer Engineering, Blacksburg, United States, (10)Goddard Earth Sciences Technology & Research (GESTAR), Columbia, MD, United States, (11)University of Alaska, Geophysical Institute and Department of Chemistry and Biochemistry, Fairbanks, United States, (12)University of East Anglia, School of Environmental Sciences, Norwich, United Kingdom, (13)NOAA Boulder, ESRL/GMD, Boulder, CO, United States, (14)NCAR, Boulder, CO, United States, (15)Univ. of Leeds, Leeds, United Kingdom
Abstract:
The Aura Ozone Monitoring Instrument (OMI) has provided global measurements of total column BrO over the past decade. To determine the impact of bromine on photochemical loss of atmospheric ozone, the contribution to total column BrO from the troposphere and stratosphere must be accurately assessed. In a 2010 study, Salawitch et al. recommended that an additional 5 to 10 ppt supply of very short lived (VSL) bromocarbons to stratospheric inorganic bromine (Bry) is necessary to accurately represent the variation of total column BrO with total column O3. This recommendation will be reevaluated in light of total column BrO measurements obtained over Fairbanks, Alaska using a multifunction differential optical absorption spectroscopy (MFDOAS) instrument and the Pandora spectrometer system. Additionally, the impact of modifications to the kinetics regulating the partitioning between BrO and BrONO2 proposed by Kreycy et al. (2013) on the current VSL Bry estimate will be explored. Finally, we will evaluate the impact of our new understanding of VSL Bry on the tropospheric residual BrO that is inferred from OMI BrO.
