Academic Commons

Articles

Biases in Southern Hemisphere climate trends induced by coarsely specifying the temporal resolution of stratospheric ozone

Neely III, R. R.; Marsh, D. R.; Smith, Karen L.; Davis, S. M.; Polvani, Lorenzo M.

Global climate models that do not include interactive middle atmosphere chemistry, such as most of those contributing to the Coupled Model Intercomparison Project Phase 5, typically specify stratospheric ozone using monthly mean, zonal mean values and linearly interpolate to the time resolution of the model. We show that this method leads to significant biases in the simulated climate of the southern hemisphere (SH) over the late twentieth century. Previous studies have attributed similar biases in simulated SH climate change to the effect of the spatial smoothing of the specified ozone, i.e., to using zonal mean concentrations. We here show that the bias in climate trends due to undersampling of the rapid temporal changes in ozone during the seasonal evolution of the Antarctic ozone hole is considerable and reaches all the way into the troposphere. Our results suggest that the bias can be substantially reduced by specifying daily ozone concentrations.

Files

  • thumnail for Neely_et_al-2014-Geophysical_Research_Letters.pdf Neely_et_al-2014-Geophysical_Research_Letters.pdf application/pdf 1.06 MB Download File

Also Published In

Title
Geophysical Research Letters
DOI
https://doi.org/10.1002/2014GL061627

More About This Work

Academic Units
Lamont-Doherty Earth Observatory
Earth and Environmental Sciences
Applied Physics and Applied Mathematics
Publisher
American Geophysical Union
Published Here
February 24, 2016
Academic Commons provides global access to research and scholarship produced at Columbia University, Barnard College, Teachers College, Union Theological Seminary and Jewish Theological Seminary. Academic Commons is managed by the Columbia University Libraries.