ACPD Atmospheric Chemistry and Physics Discussions ACPD 1680-7375 Copernicus GmbH Göttingen, Germany 10.5194/acpd-10-22019-2010 Tropospheric temperature response to stratospheric ozone recovery in the 21st century Hu Y. 1 Xia Y. 1 Fu Q. 2 Dept. of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing, 100871, China Dept. of Atmospheric Sciences, University of Washington, Seattle, WA, 98195-1640, USA 22 09 2010 10 9 22019 22046 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys-discuss.net/10/22019/2010/acpd-10-22019-2010.html The full text article is available as a PDF file from http://www.atmos-chem-phys-discuss.net/10/22019/2010/acpd-10-22019-2010.pdf

Observations show a stabilization or a weak increase of the stratospheric ozone layer since the late 1990s. Recent coupled chemistry-climate model simulations predicted that the stratospheric ozone layer will likely return to pre-1980 levels in the middle of the 21st century, as a results of the decline of ozone depleting substances under the 1987 Montreal Protocol. Since the ozone layer is an important component in determining stratospheric and tropospheric-surface energy balance, the recovery of the ozone layer may have significant impact on tropospheric-surface climate. Here, using multi-model ensemble results from both the Intergovernmental Panel on Climate Change Fourth Assessment Report (IPCC-AR4) models and coupled chemistry-climate models, we show that as ozone recovery is considered, the troposphere is warmed more than that without considering ozone recovery, suggesting an enhancement of tropospheric warming due to ozone recovery. It is found that the enhanced tropospheric warming is mostly significant in the upper troposphere, with a global mean magnitude of ~0.41 K for 2001–2050. We also find that relatively large enhanced warming occurs in the extratropics and polar regions in summer and autumn in both hemispheres while the enhanced warming is stronger in the Northern Hemisphere than in the Southern Hemisphere. Enhanced warming is also found at the surface. The strongest enhancement of surface warming is located in the Arctic in boreal winter. The global annual mean enhancement of surface warming is about 0.16 K for 2001–2050.

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