HR: 10:20h
AN: A12A-01 INVITED     [Abstracts]
TI: The impact of boreal summer monsoon circulations on dynamics and transport in the Upper Troposphere and Lower Stratosphere
AU: * Gettelman, A A
EM: andrew@ucar.edu
AF: National Center for Atmospheric Research, 1850 Table Mesa Dr., Boulder, CO 80305 United States
AB: Simulations from a Global Chemical Transport Model and observations from in-situ aircraft are used to understand the transport patterns in the Upper Troposphere and Lower Stratosphere (UT/LS). Model simulations are able to reproduce many of the climatological features of the UT/LS ozone and water vapor distributions, as well as chemical observations from the CRYSTAL-FACE experiment in July 2002. The boreal summer monsoons over South Asia and North America dominate UT/LS transport in the July-September period. Simulations indicate that up to 75% of net vertical water vapor transport during this period occurs in the monsoon region. Some of this air may by-pass the tropical tropopause. The implications for long term trends in trace species are discussed.
DE: 3334 Middle atmosphere dynamics (0341, 0342)
DE: 3337 Numerical modeling and data assimilation
DE: 3362 Stratosphere/troposphere interactions
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting