ACP Atmospheric Chemistry and Physics ACP Atmos. Chem. Phys. 1680-7324 Copernicus Publications Göttingen, Germany 10.5194/acp-14-12967-2014 Stratospheric ozone depletion from future nitrous oxide increases Wang W. 1 6 Tian W. 1 Dhomse S. https://orcid.org/0000-0003-3854-5383 2 Xie F. 3 Shu J. 4 Austin J. 5 College of Atmospheric Sciences, Lanzhou University, Lanzhou, China Institute for Climate and Atmospheric Science, School of Earth and Environment, University of Leeds, Leeds, UK College of Global Change and Earth System Science, Beijing Normal University, Beijing, China Institute of Plateau Meteorology, China Meteorological Administration, Chengdu, China Enigma Scientific Publications, Winnersh, Berkshire, UK now at: Freie Universität Berlin, Institut für Meteorologie, Berlin, Germany 08 12 2014 14 23 12967 12982 Copyright: © 2014 W. Wang et al. 2014 This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/ This article is available from https://acp.copernicus.org/articles/14/12967/2014/acp-14-12967-2014.html The full text article is available as a PDF file from https://acp.copernicus.org/articles/14/12967/2014/acp-14-12967-2014.pdf

We have investigated the impact of the assumed nitrous oxide (N<sub>2</sub>O) increases on stratospheric chemistry and dynamics using a series of idealized simulations with a coupled chemistry-climate model (CCM). In a future cooler stratosphere the net yield of NO<sub>y</sub> from N<sub>2</sub>O is shown to decrease in a reference run following the IPCC A1B scenario, but NO<sub>y</sub> can still be significantly increased by extra increases of N<sub>2</sub>O over 2001–2050. Over the last decade of simulations, 50% increases in N<sub>2</sub>O result in a maximal 6% reduction in ozone mixing ratios in the middle stratosphere at around 10 hPa and an average 2% decrease in the total ozone column (TCO) compared with the control run. This enhanced destruction could cause an ozone decline in the first half of this century in the middle stratosphere around 10 hPa, while global TCO still shows an increase at the same time. The results from a multiple linear regression analysis and sensitivity simulations with different forcings show that the chemical effect of N<sub>2</sub>O increases dominates the N<sub>2</sub>O-induced ozone depletion in the stratosphere, while the dynamical and radiative effects of N<sub>2</sub>O increases are overall insignificant. The analysis of the results reveals that the ozone depleting potential of N<sub>2</sub>O varies with the time period and is influenced by the environmental conditions. For example, carbon dioxide (CO<sub>2</sub>) increases can strongly offset the ozone depletion effect of N<sub>2</sub>O.

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