Skip to main content
Article thumbnail
Location of Repository

Causes of exceptional atmospheric circulation changes in the Southern Hemisphere

By Gareth J. Marshall, Peter A. Stott, John Turner, William M. Connolley, John C. King and Thomas A. Lachlan-Cope

Abstract

We demonstrate that recent observed trends in the annual and austral summer Southern Hemisphere Annular Mode (SAM) are unlikely to be due to internal climate variability, since they exceed any equivalent-length trends in a millennial General Circulation Model (GCM) control run with constant forcings. In contrast we show that observed trends in the SAM are consistent with the combined effects of anthropogenic and natural forcings in GCM simulations. As these trends begin prior to stratospheric ozone depletion we challenge the assertion that this process is primarily responsible for changes in the SAM. Moreover, anthropogenic forcings have a larger effect on the austral summer SAM in combination with natural forcings than when acting in isolation

Topics: Atmospheric Sciences
Publisher: American Geophysical Union
Year: 2004
DOI identifier: 10.1029/2004GL019952
OAI identifier: oai:nora.nerc.ac.uk:12264
Download PDF:
Sorry, we are unable to provide the full text but you may find it at the following location(s):
  • http://www.agu.org/journals/gl... (external link)
  • https://doi.org/10.1029/2004GL... (external link)
  • https://doi.org/10.1029/2004GL... (external link)
  • http://nora.nerc.ac.uk/id/epri... (external link)
  • Suggested articles


    To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.