Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
Atmos. Chem. Phys., 12, 2533-2540, 2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.
Peer-reviewed comment
07 Mar 2012
Comment on "Tropospheric temperature response to stratospheric ozone recovery in the 21st century" by Hu et al. (2011)
C. McLandress1, J. Perlwitz2, and T. G. Shepherd1 1Department of Physics, University of Toronto, Toronto, Ontario, Canada
2Cooperative Institute for Research in Environmental Sciences University of Colorado/NOAA Earth System Research Laboratory, Physical Sciences Division, Boulder, CO, USA
Abstract. In a recent paper Hu et al. (2011) suggest that the recovery of stratospheric ozone during the first half of this century will significantly enhance free tropospheric and surface warming caused by the anthropogenic increase of greenhouse gases, with the effects being most pronounced in Northern Hemisphere middle and high latitudes. These surprising results are based on a multi-model analysis of CMIP3 model simulations with and without prescribed stratospheric ozone recovery. Hu et al. suggest that in order to properly quantify the tropospheric and surface temperature response to stratospheric ozone recovery, it is necessary to run coupled atmosphere-ocean climate models with stratospheric ozone chemistry. The results of such an experiment are presented here, using a state-of-the-art chemistry-climate model coupled to a three-dimensional ocean model. In contrast to Hu et al., we find a much smaller Northern Hemisphere tropospheric temperature response to ozone recovery, which is of opposite sign. We suggest that their result is an artifact of the incomplete removal of the large effect of greenhouse gas warming between the two different sets of models.

Citation: McLandress, C., Perlwitz, J., and Shepherd, T. G.: Comment on "Tropospheric temperature response to stratospheric ozone recovery in the 21st century" by Hu et al. (2011), Atmos. Chem. Phys., 12, 2533-2540,, 2012.
Publications Copernicus