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Steady-state aerosol distributions in the extra-tropical, lower stratosphere and the processes that maintain them

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Author
Wilson, J.C.
Lee, S.-H.
Reeves, J.M.
Brock, C.A.
Jonsson, H.H.
Lafleur, B.G.
Loewenstein, M.
Podolske, J.
Atlas, E.
Boering, K.
Toon, G.
Fahey, D.
Bui, T.P.
Diskin, G.
Moore, F.
Date
2008
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Abstract
Measurements of aerosol, N2O and OCS made in the Northern Hemisphere below 21 km altitude following the eruption of Pinatubo are presented and analyzed. After September 1999, the oxidation of OCS and sedimentation of particles in the extra-tropical overworld north of 45N are found to maintain the aerosol in a steady state. This analysis empirically links precursor gas to aerosol abundance throughout this region. These processes are tracked with ageof- air which offers advantages over tracking as a function of latitude and altitude. In the extra-tropical, lowermost stratosphere, normalized volume distributions appear constant in time after the fall of 1999. Exchange with the troposphere is important in understanding aerosol evolution there. Size distributions of volcanically perturbed aerosol are included to distinguish between volcanic and non-volcanic conditions. This analysis suggests that model failures to correctly predict OCS and aerosol properties below 20 km in the Northern Hemisphere extra tropics result from inadequate descriptions of atmospheric circulation.
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
URI
http://hdl.handle.net/10945/40351
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