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Impact of uncertainties in atmospheric mixing on simulated UTLS composition and related radiative effects

Riese, Martin and Ploeger, F. and Rap, A. and Vogel, B. and Konopka, P. and Dameris, Martin and Forster, P. (2012) Impact of uncertainties in atmospheric mixing on simulated UTLS composition and related radiative effects. Journal of Geophysical Research, 117 (D16305), pp. 1-10. DOI: 10.1029/2012JD017751.

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Official URL: http://www.agu.org/journals/jd/jd1216/2012JD017751/2012JD017751.pdf


The upper troposphere/lower stratosphere (UTLS) region plays an important role in the climate system. Changes in the structure and chemical composition of this region result in particularly large changes in radiative forcings of the atmosphere. Quantifying the processes that control UTLS composition (e.g., stratosphere-troposphere exchange) therefore represents a crucial task. We assess the influence of uncertainties in the atmospheric mixing strength on global UTLS distributions of greenhouse gases (water vapor, ozone, methane, and nitrous oxide) and associated radiative effects. The study is based on multiannual simulations with the Chemical Lagrangian Model of the Stratosphere (CLaMS) driven by ERA-Interim meteorological data and on a state-of-the-art radiance code. Mixing, the irreversible part of transport, is controlled by the local horizontal strain and vertical shear of the atmospheric flow. We find that simulated radiative effects of water vapor and ozone, both characterized by steep gradients in the UTLS, are particularly sensitive to uncertainties of the atmospheric mixing strength. Globally averaged radiative effects are about 0.72 and 0.17 W/m2 for water vapor and ozone, respectively. For ozone, the largest impact of mixing uncertainties is observed in the extra-tropical lower stratosphere.

Document Type:Article
Title:Impact of uncertainties in atmospheric mixing on simulated UTLS composition and related radiative effects
AuthorsInstitution or Email of Authors
Riese, MartinFZ Jülich
Ploeger, F.FZ Jülich
Rap, A.Uni Leeds
Vogel, B.FZ Jülich
Konopka, P.FZ Jülich
Dameris, MartinDLR-IPA
Forster, P.Uni Leeds
Journal or Publication Title:Journal of Geophysical Research
Refereed publication:Yes
In Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 1-10
Keywords:numerical modelling, stratosphere, troposphere
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
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Dynamics
Deposited By: Prof. Dr. rer. nat. Martin Dameris
Deposited On:09 Oct 2012 12:05
Last Modified:23 Jan 2014 11:36

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