Updates to the contribution of VSL species to stratospheric Bry

Wednesday, 17 December 2014
Pam Wales1, Ross J Salawitch2, Timothy P Canty1, Raid M Suleiman3, Kelly Chance4, Richard D McPeters5, Pawan K Bhartia6, Thomas p Kurosu7, George H Mount8, Elena Spinei6, Alexander Cede6, William R Simpson9, Deanna Donohoue10, Bryan Johnson11, Douglas Edward Kinnison12 and Simone Tilmes13, (1)University of Maryland College Park, College Park, MD, United States, (2)University of Maryland, College Park, MD, United States, (3)Harvard-Smithsonian Astrophys, Cambridge, MA, United States, (4)Harvard-Smithsonian, Cambridge, MA, United States, (5)NASA Goddard SFC, Greenbelt, MD, United States, (6)NASA Goddard Space Flight Center, Greenbelt, MD, United States, (7)Jet Propulsion Laboratory, Pasadena, CA, United States, (8)Washington State Univ, Pullman, WA, United States, (9)Univ of Alaska, Fairbanks, AK, United States, (10)University of East Anglia, School of Environmental Sciences, Norwich, United Kingdom, (11)NOAA Boulder, ESRL/GMD, Boulder, CO, United States, (12)NCAR, Boulder, CO, United States, (13)Univ. of Leeds, Leeds, United Kingdom
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 (Br) 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.