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Brominated VSLS and their influence on ozone under a changing climate

Falk, Stephanie and Sinnhuber, Björn-Martin and Krysztofiak, Giséle and Jöckel, Patrick and Graf, Phoebe and Lennartz, Sinikka T. (2017) Brominated VSLS and their influence on ozone under a changing climate. Atmospheric Chemistry and Physics (ACP), 17 (18), pp. 11313-11329. Copernicus Publications. DOI: 10.5194/acp-17-11313-2017 ISSN 1680-7316

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Official URL: https://www.atmos-chem-phys.net/17/11313/2017/

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.

Item URL in elib:https://elib.dlr.de/114386/
Document Type:Article
Title:Brominated VSLS and their influence on ozone under a changing climate
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Falk, StephanieKIT, KarlsruheUNSPECIFIED
Sinnhuber, Björn-MartinKIT, KarlsruheUNSPECIFIED
Krysztofiak, GiséleLPC2E, Université d’Orléans, CNRS, UMR7328, Orléans, FranceUNSPECIFIED
Jöckel, Patrickdlr, ipahttps://orcid.org/0000-0002-8964-1394
Graf, Phoebedlr, ipahttps://orcid.org/0000-0002-7494-8035
Lennartz, Sinikka T.Geomar, Helmholtz Centre for Ocean Research KielUNSPECIFIED
Date:25 September 2017
Journal or Publication Title:Atmospheric Chemistry and Physics (ACP)
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:17
DOI :10.5194/acp-17-11313-2017
Page Range:pp. 11313-11329
Publisher:Copernicus Publications
ISSN:1680-7316
Status:Published
Keywords:EMAC, MESSy, Modular Earth Submodel System, VSLS, very short lived species, bromocarbons, atmospheric chemistry, stratospheric chlorine, stratospheric bromine
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Atmosphären- und Klimaforschung, R - Project Climatic relevance of atmospheric tracer gases, aerosols and clouds
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Earth System Modelling
Deposited By: Jöckel, Dr. Patrick
Deposited On:23 Oct 2017 08:41
Last Modified:02 May 2019 13:59

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