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Title: Impact of biogenic very short-lived bromine on the Antarctic ozone hole during the 21st century

Active bromine released from the photochemical decomposition of biogenic very short-lived bromocarbons (VSL Br) enhances stratospheric ozone depletion. Based on a dual set of 1960–2100 coupled chemistry–climate simulations (i.e. with and without VSL Br), we show that the maximum Antarctic ozone hole depletion increases by up to 14 % when natural VSL Br are considered, which is in better agreement with ozone observations. The impact of the additional 5 pptv VSL Br on Antarctic ozone is most evident in the periphery of the ozone hole, producing an expansion of the ozone hole area of ~5 million km 2, which is equivalent in magnitude to the recently estimated Antarctic ozone healing due to the implementation of the Montreal Protocol. We find that the inclusion of VSL Br in CAM-Chem (Community Atmosphere Model with Chemistry, version 4.0) does not introduce a significant delay of the modelled ozone return date to 1980 October levels, but instead affects the depth and duration of the simulated ozone hole. Our analysis further shows that total bromine-catalysed ozone destruction in the lower stratosphere surpasses that of chlorine by the year 2070 and indicates that natural VSL Br chemistry would dominate Antarctic ozone seasonality before the end of themore » 21st century. As a result, this work suggests a large influence of biogenic bromine on the future Antarctic ozone layer.« less
Authors:
ORCiD logo [1] ;  [2] ;  [2] ;  [2] ;  [3]
  1. Institute of Physical Chemistry Rocasolano, Madrid (Spain); National Research Council (CONICET); Mendoza (Argentina)
  2. National Center for Atmospheric Research, Boulder, CO (United States)
  3. Institute of Physical Chemistry Rocasolano, Madrid (Spain)
Publication Date:
Grant/Contract Number:
SC0009988
Type:
Accepted Manuscript
Journal Name:
Atmospheric Chemistry and Physics (Online)
Additional Journal Information:
Journal Name: Atmospheric Chemistry and Physics (Online); Journal Volume: 17; Journal Issue: 3; Journal ID: ISSN 1680-7324
Publisher:
European Geosciences Union
Research Org:
Institute of Advanced Study, Princeton, NJ (United States)
Sponsoring Org:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
Country of Publication:
United States
Language:
English
Subject:
09 BIOMASS FUELS; earth system model; tropical tropopause layer; stratospheric ozone; climate model; iodine chemistry; simulation; bromocarbons; troposphere; substances; emissions
OSTI Identifier:
1358422