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Radiative forcing since preindustrial times due to ozone change in the troposphere and the lower stratosphere

Gauss, M and Myhre, G and Isaksen, I S A and Grewe, V and Pitari, G and Wild, O and Collins, W J and Dentener, F J and Ellingsen, K and Gohar, L K and Hauglustaine, D A and Iachetti, D and Lamarque, J F and Mancini, E and Mickley, L J and Prather, M J and Pyle, J A and Sanderson, M G and Shine, K P and Stevenson, D S and Sudo, K and Szopa, S and Zeng, G (2006) Radiative forcing since preindustrial times due to ozone change in the troposphere and the lower stratosphere. Atmospheric Chemistry and Physics, 6. pp. 575-599. ISSN 1680-7316

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    Abstract

    Changes in atmospheric ozone have occurred since the preindustrial era as a result of increasing anthropogenic emissions. Within ACCENT, a European Network of Excellence, ozone changes between 1850 and 2000 are assessed for the troposphere and the lower stratosphere ( up to 30 km) by a variety of seven chemistry-climate models and three chemical transport models. The modeled ozone changes are taken as input for detailed calculations of radiative forcing. When only changes in chemistry are considered ( constant climate) the modeled global-mean tropospheric ozone column increase since preindustrial times ranges from 7.9 DU to 13.8 DU among the ten participating models, while the stratospheric column reduction lies between 14.1 DU and 28.6 DU in the models considering stratospheric chemistry. The resulting radiative forcing is strongly dependent on the location and altitude of the modeled ozone change and varies between 0.25 Wm(-2) and 0.45 Wm(-2) due to ozone change in the troposphere and - 0.123 Wm(-2) and + 0.066 Wm(-2) due to the stratospheric ozone change. Changes in ozone and other greenhouse gases since preindustrial times have altered climate. Six out of the ten participating models have performed an additional calculation taking into account both chemical and climate change. In most models the isolated effect of climate change is an enhancement of the tropospheric ozone column increase, while the stratospheric reduction becomes slightly less severe. In the three climate-chemistry models with detailed tropospheric and stratospheric chemistry the inclusion of climate change increases the resulting radiative forcing due to tropospheric ozone change by up to 0.10 Wm(-2), while the radiative forcing due to stratospheric ozone change is reduced by up to 0.034 Wm(-2). Considering tropospheric and stratospheric change combined, the total ozone column change is negative while the resulting net radiative forcing is positive.

    Item Type: Article
    Journal or Publication Title: Atmospheric Chemistry and Physics
    Uncontrolled Keywords: GENERAL-CIRCULATION MODEL ; CHEMISTRY-CLIMATE MODEL ; CHEMICAL-TRANSPORT MODEL ; CUMULUS PARAMETERIZATION ; ATMOSPHERIC CHEMISTRY ; FUTURE CLIMATE ; CARBON-CYCLE ; SIMULATIONS ; VARIABILITY ; EVOLUTION
    Subjects: UNSPECIFIED
    Departments: Faculty of Science and Technology > Lancaster Environment Centre
    ID Code: 49582
    Deposited By: ep_importer_pure
    Deposited On: 07 Sep 2011 11:50
    Refereed?: Yes
    Published?: Published
    Last Modified: 06 Sep 2013 22:28
    Identification Number:
    URI: http://eprints.lancs.ac.uk/id/eprint/49582

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