Detecting ozone- and greenhouse gas-driven wind trends with observational data.

Sukyoung Lee, Steven B Feldstein

Department of Meteorology, The Pennsylvania State University, University Park, PA 16802, USA. sxl31@meteo.psu.edu

Science (New York, N.Y.) 2013 Feb 1

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Modeling studies suggest that Antarctic ozone depletion and, to a lesser degree, greenhouse gas (GHG) increase have caused the observed poleward shift in the westerly jet during the austral summer. Similar studies have not been performed previously with observational data because of difficulties in separating the two contributions. By applying a cluster analysis to daily ERA-Interim data, we found two 7- to 11-day wind clusters, one resembling the models' responses to GHG forcing and the other resembling ozone depletion. The trends in the clusters' frequency of occurrence indicate that the ozone contributed about 50% more than GHG toward the jet shift, supporting the modeling results. Moreover, tropical convection apparently plays an important role for the GHG-driven trend.

Citation

Sukyoung Lee, Steven B Feldstein. Detecting ozone- and greenhouse gas-driven wind trends with observational data. Science (New York, N.Y.). 2013 Feb 1;339(6119):563-7