HR: 17:00h
AN: U42B-05 INVITED     [PDF]
TI: A Model Study of the Impact of Magnetic Field Reversal on Atmospheric Composition During Solar Proton Events
AU: * Jackman, C H
EM: Charles.H.Jackman@nasa.gov
AF: NASA Goddard Space Flight Center, Code 916 NASA Goddard Space Flight Center, Greenbelt, MD 20771 United States
AU: Sinnhuber, M
EM: miriam@iup.physik.uni-bremen.de
AF: University of Bremen, Institute of Environmental Physics University of Bremen, Bremen, D-28334 Germany
AU: Burrows, J P
EM: burrows@iup.physik.uni-bremen.de
AF: University of Bremen, Institute of Environmental Physics University of Bremen, Bremen, D-28334 Germany
AU: Chipperfield, M P
EM: martyn@env.leeds.ac.uk
AF: University of Leeds, School of the Environment University of Leeds, Leeds, LS2 9JT United Kingdom
AU: Kallenrode, M
EM: mkallenr@uni-osnabrueck.de
AF: University of Osnabruck, University of Osnabruck, Osnabruck, D-49069 Germany
AU: Kunzi, K F
EM: kunzi@physik.uni-bremen.de
AF: University of Bremen, Institute of Environmental Physics University of Bremen, Bremen, D-28334 Germany
AU: Quack, M
EM: quack@iup.physik.uni-bremen.de
AF: University of Bremen, Institute of Environmental Physics University of Bremen, Bremen, D-28334 Germany
AU: Quack, M
EM: quack@iup.physik.uni-bremen.de
AF: University of Osnabruck, University of Osnabruck, Osnabruck, D-49069 Germany
AB: During a polarity transition of the Earth's magnetic field, the structure and strength of the field change significantly from their present values. This will alter the global pattern of charged particle precipitation into the atmosphere. Thus, particle precipitation is possible into regions that are at the moment effectively shielded by the Earth's magnetic field. A two-dimensional global coupled chemistry, radiation, and transport model of the atmosphere has been used to investigate how the increased particle precipitation affects the chemical composition of the middle and lower atmosphere. Ozone losses resulting from large energetic particle events are found to increase significantly, with resultant losses similar to those observed in the Antarctic ozone hole of the 1990s. This results in significant increases in surface UV-B radiation as well as changes in stratospheric temperature and circulation over a period of several months after large particle events.
DE: 0340 Middle atmosphere--composition and chemistry
DE: 0341 Middle atmosphere--constituent transport and chemistry (3334)
DE: 0342 Middle atmosphere--energy deposition
SC: U
MN: 2003 Fall Meeting