Coupled chemistry climate model simulations of the solar cycle in ozone and temperature

John Austin (1) , K. Tourpali (2) , E. Rozanov (3) , H. Akiyoshi (4) , Slimane Bekki (5) , G. Bodeker (6) , C. Brühl (7) , N. Butchart (8) , M. Chipperfield (9) , M. Deushi (10) , V.I. Fomichev (11) , M.A. Giorgetta (12) , L. Gray (13) , K. Kodera (14, 10) , François Lott (15) , E. Manzini (16) , D. Marsh (17) , K. Matthes (17, 18) , T. Nagashima (4) , K. Shibata (10) , R.S. Stolarski (19) , H. Struthers (6) , W. Tian (9)

1 GFDL - NOAA Geophysical Fluid Dynamics Laboratory
2 Laboratory of Atmospheric Physics [Thessaloniki]
3 PMOD/WRC - Physikalisch-Meteorologisches Observatorium Davos/World Radiation Center
4 NIES - National Institute for Environmental Studies
5 SA - Service d'aéronomie
6 NIWA - National Institute of Water and Atmospheric Research [Auckland]
7 MPIC - Max-Planck-Institut für Chemie
8 Met Office Climate Research Division
9 ICAS - Institute for Climate and Atmospheric Science [Leeds]
10 MRI - Meteorological Research Institute [Tsukuba]
11 ESSE - Department of Earth and Space Science and Engineering [York University - Toronto]
12 MPI-M - Max Planck Institute for Meteorology
13 CGAM - Centre for Global Atmospheric Modelling
14 Graduate School of Environmental Studies [Nagoya]
15 LMD - Laboratoire de Météorologie Dynamique (UMR 8539)
16 INGV - Istituto Nazionale di Geofisica e Vulcanologia - Sezione di Bologna
17 NCAR - National Center for Atmospheric Research [Boulder]
18 Institut für Meteorologie [Berlin]
19 GSFC - NASA Goddard Space Flight Center

The 11-year solar cycles in ozone and temperature are examined using newsimulations of coupled chemistry climate models. The results show a secondary maximumin stratospheric tropical ozone, in agreement with satellite observations and in contrastwith most previously published simulations. The mean model response varies by upto about 2.5% in ozone and 0.8 K in temperature during a typical solar cycle, at the lowerend of the observed ranges of peak responses. Neither the upper atmospheric effectsof energetic particles nor the presence of the quasi biennial oscillation is necessaryto simulate the lower stratospheric response in the observed low latitude ozoneconcentration. Comparisons are also made between model simulations and observed totalcolumn ozone. As in previous studies, the model simulations agree well with observations.For those models which cover the full temporal range 1960–2005, the ozone solarsignal below 50 hPa changes substantially from the first two solar cycles to the last twosolar cycles. Further investigation suggests that this difference is due to an aliasingbetween the sea surface temperatures and the solar cycle during the first part of the period.The relationship between these results and the overall structure in the tropical solarozone response is discussed. Further understanding of solar processes requiresimprovement in the observations of the vertically varying and column integrated ozone.

Mots clés: solar cycle; stratospheric ozone; stratospheric temperature

Domaines: Physique Atmosphérique et Océanique [physics.ao-ph]

John Austin, K. Tourpali, E. Rozanov, H. Akiyoshi, Slimane Bekki, et al.. Coupled chemistry climate model simulations of the solar cycle in ozone and temperature. Journal of Geophysical Research: Atmospheres, 2008, 113, pp.D11306. ⟨10.1029/2007JD009391⟩. ⟨hal-00287829⟩