Brominated VSLS and their influence on ozone under a changing climate.

Falk, Stefanie, Sinnhuber, Björn-Martin, Krysztofiak, Gisèle, Jöckel, Patrick, Graf, Phoebe and Lennartz, Sinikka T. (2017) Brominated VSLS and their influence on ozone under a changing climate. Open Access Atmospheric Chemistry and Physics, 17 (18). pp. 11313-11329. DOI 10.5194/acp-17-11313-2017.

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Abstract

Very short-lived substances (VSLS) contribute as source gases significantly to the tropospheric and stratospheric bromine loading. At present, an estimated 25% of stratospheric bromine is of oceanic origin. In this study, we investigate how climate change may impact the ocean- atmosphere flux of brominated VSLS, their atmospheric transport, and chemical transformations and evaluate how these changes will affect stratospheric ozone over the 21st century. Under the assumption of fixed ocean water concentrations and RCP6.0 scenario, we find an increase of the ocean- atmosphere flux of brominated VSLS of about 8-10% by the end of the 21st century compared to present day. A decrease in the tropospheric mixing ratios of VSLS and an increase in the lower stratosphere are attributed to changes in atmospheric chemistry and transport. Our model simulations reveal that this increase is counteracted by a corresponding reduction of inorganic bromine. Therefore the total amount of bromine from VSLS in the stratosphere will not be changed by an increase in upwelling. Part of the increase of VSLS in the tropical lower stratosphere results from an increase in the corresponding tropopause height. As the depletion of stratospheric ozone due to bromine depends also on the availability of chlorine, we find the impact of bromine on stratospheric ozone at the end of the 21st century reduced compared to present day. Thus, these studies highlight the different factors influencing the role of brominated VSLS in a future climate

Document Type: Article
Funder compliance: info:eu-repo/grantAgreement/EC/H2020/640276
Additional Information: This article is part of the special issue “The Modular Earth Submodel System (MESSy) (ACP/GMD interjournal SI)”. It is not associated with a conference
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.5194/acp-17-11313-2017
ISSN: 1680-7316
Projects: SHARP, ROMIC THREAT, GAIA-CLIM, ATMO
Date Deposited: 11 Oct 2017 11:33
Last Modified: 01 Feb 2019 15:12
URI: http://oceanrep.geomar.de/id/eprint/39889

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