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Because tropospheric ozone is both a greenhouse gas and harmful air pollutant, it is important to understand how anthropogenic activities may influence its abundance and distribution through the 21st century. Here, we present model simulations performed with the chemistry–climate model SOCOL, in which spatially disaggregated chemistry and transport tracers(More)
In addition to CO 2 , the climate impact of aviation is strongly influenced by non-CO 2 emissions, such as nitrogen oxides, influencing ozone and methane, and water vapour, which can lead to the formation of persistent con-trails in ice-supersaturated regions. Because these non-CO 2 emission effects are characterised by a short lifetime, their climate(More)
John Austin, J. Scinocca, D. Plummer, L. Oman, D. Waugh, H. Akiyoshi, S. Bekki, P. Braesicke, N. Butchart, M. Chipperfield, D. Cugnet, M. Dameris, S. Dhomse, V. Eyring, S. Frith, R. R. Garcia, H. Garny, A. Gettelman, S. C. Hardiman, D. Kinnison, J. F. Lamarque, E. Mancini, M. Marchand, M. Michou, O. Morgenstern, T. Nakamura, S. Pawson, G. Pitari, J. Pyle,(More)
Edwin P. Gerber, Mark P. Baldwin, Hideharu Akiyoshi, John Austin, Slimane Bekki, Peter Braesicke, Neal Butchart,MartynChipperfield,Martin Dameris, SandipDhomse, Stacey M. Frith, Rolando R. Garcia, Hella Garny, Andrew Gettelman, Steven C. Hardiman, Alexey Karpechko, Marion Marchand, Olaf Morgenstern, J. Eric Nielsen, Steven Pawson, Tom Peter, David A.(More)
This study investigates the abrupt and severe water vapour decline in the stratosphere beginning in the year 2000 (the “millennium water vapour drop”) and other similarly strong stratospheric water vapour reductions by means of various simulations with the state-of-the-art ChemistryClimate Model (CCM) EMAC (ECHAM/MESSy Atmospheric Chemistry Model). The(More)
Projections of stratospheric ozone from a suite of chemistry-climate models (CCMs) have been analyzed. In addition to a reference simulation where anthropogenic halogenated ozone depleting substances (ODSs) and greenhouse gases (GHGs) vary with time, sensitivity simulations with either ODS or GHG concentrations fixed at 1960 levels were performed to(More)
A. Gettelman, M. I. Hegglin, S.‐W. Son, J. Kim, M. Fujiwara, T. Birner, S. Kremser, M. Rex, J. A. Añel, H. Akiyoshi, J. Austin, S. Bekki, P. Braesike, C. Brühl, N. Butchart, M. Chipperfield, M. Dameris, S. Dhomse, H. Garny, S. C. Hardiman, P. Jöckel, D. E. Kinnison, J. F. Lamarque, E. Mancini, M. Marchand, M. Michou, O. Morgenstern, S. Pawson, G. Pitari, D.(More)
N. Butchart, A. J. Charlton‐Perez, I. Cionni, S. C. Hardiman, P. H. Haynes, K. Krüger, P. J. Kushner, P. A. Newman, S. M. Osprey, J. Perlwitz, M. Sigmond, L. Wang, H. Akiyoshi, J. Austin, S. Bekki, A. Baumgaertner, P. Braesicke, C. Brühl, M. Chipperfield, M. Dameris, S. Dhomse, V. Eyring, R. Garcia, H. Garny, P. Jöckel, J.‐F. Lamarque, M. Marchand, M.(More)
M. I. Hegglin, A. Gettelman, P. Hoor, R. Krichevsky, G. L. Manney, L. L. Pan, S.‐W. Son, G. Stiller, S. Tilmes, K. A. Walker, V. Eyring, T. G. Shepherd, D. Waugh, H. Akiyoshi, J. A. Añel, J. Austin, A. Baumgaertner, S. Bekki, P. Braesicke, C. Brühl, N. Butchart, M. Chipperfield, M. Dameris, S. Dhomse, S. Frith, H. Garny, S. C. Hardiman, P. Jöckel, D. E.(More)
The connection between the El Niño Southern Oscillation (ENSO) and the Northern polar stratosphere has been established from observations and atmospheric modeling. Here a systematic inter-comparison of the sensitivity of the modeled stratosphere to ENSO in Chemistry Climate Models (CCMs) is reported. This work uses results from a number of the CCMs included(More)