next: a phenomenon known as the "Arctic Oscillation". The month-to-month changes are well simulated in climate models, and recent experiments with several of these models suggest that a gradual tightening of the polar vortex, similar to what has been observed over the past few decades, could be an indirect effect of greenhouse warming. Both observations and models show indications of an analogous tightening of the Southern Hemisphere polar vortex. Though less predictable from one year to the next than El Nino, the Arctic Oscillation and its Southern Hemisphere counterpart appear to be more important than ENSO in terms of their contribution to recent global climate trends.

Panel:
David W.J. Thompson, Department of Atmospheric Sciences, University of Washington, Seattle, Washington
Mark P. Baldwin, Northwest Research Associates, Bellevue, Washington
John M. Wallace, Department of Atmospheric Sciences, University of Washington, Seattle, WashingtonBR> (Sessions A42C, A51E, A52C)

Galileo at Io
Friday, December 17, 12:15 PM.
This session will report on spacecraft Galileo's closest ever fly-by of Io, Jupiter's volcanic moon. It will focus on cooperative observations of volcanic eruptions on Io from various Galileo instruments and from Earth. (This press conference will consist of new results and will not duplicate the November 19 NASA Space Science Update on Io.)

Panel:
Laszlo Keszthelyi, Galileo imaging team, Lunar and Planetary Laboratory, University of Arizona, Tucson, Arizona
John R. Spencer, Galileo Photopolarimeter-Radiometer (PPR) team, Lowell Observatory, Flagstaff, Arizona
Rosaly Lopes-Gautier or Ashley G. Davies, Near-Infrared Mapping Spectrometer (NIMS) team, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California
(Sessions P41A, P51C, P52A)

********** II. Events of interest to the media (in chronological order)

Field Trip for Press Room Registrants'"/>

Contact: Harvey Leifert
hleifert@agu.org
202-777-7507
American Geophysical Union
5-Dec-1999

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