The effect of representing bromine from VSLS on the simulation and evolution of Antarctic ozone. Issue 18 (19th September 2016)

• Record Type: Journal Article
• Authors: Oman, Luke D.; Douglass, Anne R.; Salawitch, Ross J.; Canty, Timothy P.; Ziemke, Jerald R.; Manyin, Michael
• Is Part Of: Geophysical research letters. Volume 43:Issue 18(2016)
• Page Start: 9869
• Page End: 9876
• Publication Date: 2016-09-19
• Subjects: ozone layer -- Chemistry‐Climate Modeling -- bromine; Geophysics -- Periodicals; Planets -- Periodicals; Lunar geology -- Periodicals; 550
• DOI: 10.1002/2016GL070471
• Languages: English
• ISSNs: 0094-8276

Abstract

Abstract: We use the Goddard Earth Observing System Chemistry‐Climate Model, a contributor to both the 2010 and 2014 World Meteorological Organization Ozone Assessment Reports, to show that inclusion of 5 parts per trillion (ppt) of stratospheric bromine (Bry ) from very short lived substances (VSLS) is responsible for about a decade delay in ozone hole recovery. These results partially explain the significantly later recovery of Antarctic ozone noted in the 2014 report, as bromine from VSLS was not included in the 2010 Assessment. We show multiple lines of evidence that simulations that account for VSLS Br y are in better agreement with both total column BrO and the seasonal evolution of Antarctic ozone reported by the Ozone Monitoring Instrument on NASA's Aura satellite. In addition, the near‐zero ozone levels observed in the deep Antarctic lower stratospheric polar vortex are only reproduced in a simulation that includes this Br y source from VSLS. Key Points: Including 5 ppt of Br from VSLS reduces biases with observed ozone and BrO Resolves a discrepancy with an observational derived parametric model Causes a decade later recovery of Antarctic ozone to 1980 levels