HR: 14:50h
AN: A43D-06    [Abstracts]
TI: Volcanic Aerosol Simulations of El Chichón and Pinatubo: Stratospheric Impacts and Decay Rates
AU: * Weisenstein, D K
EM: weisenstein@aer.com
AF: Atmospheric and Environmental Research, 131 Hartwell Ave., Lexington, MA 02421-3126, United States
AU: Cady-Pereira, K E
EM: cadyp@aer.com
AF: Atmospheric and Environmental Research, 131 Hartwell Ave., Lexington, MA 02421-3126, United States
AU: Fleming, E L
EM: fleming@kahuna.gsfc.nasa.gov
AF: NASA Goddard Space Flight Center, Code 613.3, Greenbelt, MD 20771-0001, United States
AU: Jackman, C H
EM: charles.h.jackman@nasa.gov
AF: NASA Goddard Space Flight Center, Code 613.3, Greenbelt, MD 20771-0001, United States
AB: Using the AER 2-D sulfate aerosol model, we simulate the eruptions of El Chichón, Mt. Pinatubo, and a significantly larger hypothetical eruption. Interannual stratospheric transport based on NCAR-NCEP reanalysis-2 data [Fleming et al., 2007] is used for the historical periods (1982-1990, 1991-1999), thus including QBO and El Nino effects. Aerosol decay rates are compared with available observations, and calculated aerosol size distributions for the different eruptions are contrasted. We show that e-folding decay rates of aerosol extinction vary almost linearly with effective radius. Impacts on zonal-mean ozone density are shown, along with changes in radiative forcing.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0340 Middle atmosphere: composition and chemistry
DE: 0341 Middle atmosphere: constituent transport and chemistry (3334)
DE: 0370 Volcanic effects (8409)
SC: Atmospheric Sciences [A]
MN: 2007 Joint Assembly