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Improving Antarctic total ozone projections by a process-oriented multiple diagnostic ensemble regression

Karpechko, Alexey Yu and Maraun, Douglas and Eyring, Veronika (2013) Improving Antarctic total ozone projections by a process-oriented multiple diagnostic ensemble regression. Journal of the Atmospheric Sciences, 70 (12), pp. 3959-3976. American Meteorological Society. DOI: 10.1175/JAS-D-13-071.1 ISSN 0022-4928

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Official URL: http://journals.ametsoc.org/doi/abs/10.1175/JAS-D-13-071.1

Abstract

Accurate projections of stratospheric ozone are required, because ozone changes impact on exposures to ultraviolet radiation and on tropospheric climate. Unweighted multi-model ensemble mean (uMMM) projections from chemistry-climate models (CCMs) are commonly used to project ozone in the 21th century, when ozone-depleting substances are expected to decline and greenhouse gases expected to rise. Here, we address the question whether Antarctic total column ozone projections in October given by the uMMM of CCM simulations can be improved by using a process-oriented multiple diagnostic ensemble regression (MDER) method. This method is based on the correlation between simulated future ozone and selected key processes relevant for stratospheric ozone under present-day conditions. The regression model is built using an algorithm that selects those process-oriented diagnostics which explain a significant fraction of the spread in the projected ozone among the CCMs. The regression model with observed diagnostics is then used to predict future ozone and associated uncertainty. The precision of our method is tested in a pseudo-reality, i.e. the prediction is validated against an independent CCM projection used to replace unavailable future observations. The tests show that MDER has a higher precision than uMMM, suggesting an improvement in the estimate of future Antarctic ozone. Our method projects that Antarctic total ozone will return to 1980 values at around 2055 with the 95% prediction interval ranging from 2035 to 2080. This reduces the range of return dates across the ensemble of CCMs by about a decade and suggests that the earliest simulated return dates are unlikely.

Item URL in elib:https://elib.dlr.de/85279/
Document Type:Article
Title:Improving Antarctic total ozone projections by a process-oriented multiple diagnostic ensemble regression
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Karpechko, Alexey YuUNSPECIFIEDUNSPECIFIED
Maraun, DouglasUNSPECIFIEDUNSPECIFIED
Eyring, VeronikaDLR, IPAUNSPECIFIED
Date:2013
Journal or Publication Title:Journal of the Atmospheric Sciences
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:70
DOI :10.1175/JAS-D-13-071.1
Page Range:pp. 3959-3976
Publisher:American Meteorological Society
Series Name:AMS Journals
ISSN:0022-4928
Status:Published
Keywords:chemistry-climate, ozone, model evaluation, model weighting, emergent constraints
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 - Projekt ESMVal (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Dynamics
Deposited By: Eyring, PD Dr. habil. Veronika
Deposited On:13 Nov 2013 07:00
Last Modified:06 Sep 2019 15:27

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