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  • Karpechko, A. Yu., N. P. Gillett, G. J. Marshall, and A. A. Scaife, 2008: Stratospheric influence on circulation changes in the Southern Hemisphere troposphere in coupled climate models. Geophys. Res. Lett., 35, L20806, doi:10.1029/2008GL035354.

The recent intensification of the circumpolar circulation
in the SH troposphere in summer and autumn has been
attributed to external forcing such as stratospheric ozone
depletion and greenhouse gas (GHG) increases. Several
studies have shown that climate models are able to simulate
observed changes when forced by observed ozone trends or
combined ozone and GHG trends. However, as some of
these studies suffered from erroneously specified forcing,
the reason for the circulation intensification remains
debatable. Here, we re-approach this issue using data from
21 CMIP3 models. We demonstrate that only models that
include ozone depletion simulate downward propagation of
the circulation changes from the stratosphere to the
troposphere similar to that observed, with GHG increases
causing significant Antarctic geopotential height trends only
in the lower troposphere. These changes are simulated by
the majority of the ozone-forced models except those with
the lowest vertical resolution between 300 hPa and 10 hPa.


Full Article: http://www.agu.org/journals/gl/gl0820/2008GL035354/

Last Updated: 2008-10-21

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