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Chemical contribution to future tropical ozone change in the lower stratosphere

Meul, Stefanie and Langematz, U. and Oberländer, S. and Garny, Hella and Jöckel, Patrick (2014) Chemical contribution to future tropical ozone change in the lower stratosphere. Atmospheric Chemistry and Physics, 14 (6), pp. 2959-2971. Copernicus Publications. doi: [10.5194/acp-14-2959-2014]. ISSN 1680-7316.

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Official URL: http://www.atmos-chem-phys.net/14/2959/2014/


The future evolution of tropical ozone in a changing climate is investigated by analysing time slice simulations made with the chemistry–climate model EMAC. Between the present and the end of the 21st century a significant increase in ozone is found globally for the upper stratosphere and the extratropical lower stratosphere, while in the tropical lower stratosphere ozone decreases significantly by up to 30%. Previous studies have shown that this decrease is connected to changes in tropical upwelling. Here the dominant role of transport for the future ozone decrease is confirmed, but it is found that in addition changes in chemical ozone production and destruction do contribute to the ozone changes in the tropical lower stratosphere. Between 50 and 30 hPa the dynamically induced ozone decrease of up to 22% is amplified by 11–19% due to a reduced ozone production. This is counteracted by a decrease in the ozone loss causing an ozone increase by 15–28%. At 70 hPa the large ozone decrease due to transport (−52%) is reduced by an enhanced photochemical ozone production (+28%) but slightly increased (−5%) due to an enhanced ozone loss. It is found that the increase in the ozone production in the lowermost stratosphere is mainly due to a transport induced decrease in the overlying ozone column while at higher altitudes the ozone production decreases as a consequence of a chemically induced increase in the overlying ozone column. The ozone increase that is attributed to changes in ozone loss between 50 and 30 hPa is mainly caused by a slowing of the ClOx and NOx loss cycles. The enhanced ozone destruction below 70 hPa can be attributed to an increased efficiency of the HOx loss cycle. The role of ozone transport in determining the ozone trend in this region is found to depend on the changes in the net production as a reduced net production also reduces the amount of ozone that can be transported within an air parcel.

Item URL in elib:https://elib.dlr.de/89293/
Document Type:Article
Title:Chemical contribution to future tropical ozone change in the lower stratosphere
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Meul, StefanieInst. für Meteorologie, Freie Univ. Berlin, GermanyUNSPECIFIED
Langematz, U.Inst. für Meteorologie, Freie Univ. Berlin, GermanyUNSPECIFIED
Oberländer, S.Inst. für Meteorologie, Freie Univ. Berlin, GermanyUNSPECIFIED
Date:25 March 2014
Journal or Publication Title:Atmospheric Chemistry and Physics
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
Page Range:pp. 2959-2971
Publisher:Copernicus Publications
Keywords:Ozon, Stratosphäre, Atmosphäre, Modell, EMAC
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Atmospheric and climate research
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Earth System Modelling
Deposited By: Jöckel, Dr. Patrick
Deposited On:10 Jun 2014 12:26
Last Modified:02 May 2019 14:04

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