16th Conference on Climate Variability and Change
8th Conference on Polar Meteorology and Oceanography

J3.4

Long-term Trends and Variability in the Atmospheric Circulation over Antarctica: 1957-2004

William D. Neff, NOAA, Boulder, Colorado

Previous work (Neff, JGR, 1999) revealed that one of the effects of the ozone depletion of recent decades has been a delay in the dynamical springtime in the troposphere over Antarctica. Recently, other authors have examined trends in the Antarctic Oscillation with a particular emphasis on its relation to warming in the vicinity of the Antarctic Peninsula. Here, we examine trends in the behavior of the Antarctic Oscillation using six stations that have nearly compete upper air sounding data from 1957 to the present at 500 hPa and encompass a larger geographical area than previous analyses. Emphasis is placed on both seasonal analyses as well as contrasting trends observed along the coast of East Antarctica with those observed over more centrally located sites within the polar vortex.

Joint Session 3, Climate of the Southern High Latitudes (Joint Session with the Eight Conference on Polar Meteorology and the 16th Conference on Climate Variability and Change) ( parallel with Session 14)
Thursday, 13 January 2005, 11:00 AM-12:15 PM

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