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NCAR UPDATES National Center for Atmospheric Research • Office of the Director • P.O. Box 3000 Boulder, Colorado 80307 1 1 989-20 NCAR Hosts Workshop on Mechanisms for Tropospheric Effects of Solar Variability and the Quasi-Biennial Oscillation NCAR will host a workshop, "Mechanisms for Tropospheric Effects of Solar Variability and the Quasi-Biennial Oscillation," organized by Susan K. Avery of the University of Colorado and Brian Tinsley of the University of Texas, and sponsored by a grant from the Solar Terrestrial Program of the National Science Foundation. The workshop, which is part of the Coupling, Energetics and Dynamics of the Atmospheric Regions (CEDAR) and STEP (SCOSTEP) initiatives, will take place on June 20 and 21 at the Mesa Laboratory. The workshop objectives are to search for and evaluate hypotheses for mechanisms that might account for connections among the solar variability/the quasi-biennial oscillation and weather. Five invited papers will be presented between 8:30 a.m. and 12:25 p.m. on Tuesday. June 20; "Solar Cycle and QBO-Related Changes in the Troposphere and Stratosphere ," Karin Labitzke, Free University of Berlin, West Germany, and Harry van Loon, Climate and Global Dynamics Division (CGD), NCAR. "Solar Cycle and QBO-Related Changes in Sea Surface Temperature," T.P. Barnett, Scripps Institution of Oceanography, University of California at San Diego. "Short Term Solar Wind-Related Changes in the Troposphere, H G. M. Brown, University of Wales. _ trie rs of Solar Variability to the Stratosphere and Troposphere" Raymond Roble, High Altitude Observatory, NCAR. "Capabilities of Measurements of Cloud Variability from Satellites," Robert M. Rabin, NOAA/NESDIS Tuesday afternoon sessions will feature the following papers between 2:00 and 5:00 p.m.: "Ion and Aerosol Chemistry and Possible Links with Cloud Microphysics," Volker Mohnen, State University of New York at Albany. "Chemistry of Minor Constituents and Possible Solar Cycle and QBO Changes," Guy Brasseur, Atmospheric Chemistry Division, NCAR. "Cloud Physics and Thunderstorm Electrification ,* James Dye, Mesoscale and Microscale Meteorology Division, NCAR. "Modeling the QBO and Forcing by Solar Activity," M. Dameris, Federal Republic of Germany. " Can the QBO Be Simulated with a GMC?" Byron Boville, CGD, NCAR. Wednesday. June 21. from 8:30 a.m. to 5:30 p.m. will be devoted to a short poster session and then to the formation of working groups, which will discuss the possible mechanisms for the solar variability effect; what data sets should be examined to clarify each mechanism's viability; what theoretical work and numerical modeling work should be done to clarify the viability of each suggested mechanism; what laboratory work should be done to investigate possible mechanisms; and what observation programs should be planned to gather data and test mechanisms? The working groups will report back to the full group for discussion and immendations before ending the session. Update Contact: Joan Vandiver Frisch, NCAR Director's Office, (303) 497-8720.

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