Modeling Stratospheric Aerosols at Background Levels: New Results from SOCOL and GEOS-CHEM. Debra Weisenstein 1 , Sebastian Eastham 2 , Jianxiong Sheng 3 , Steven Barrett 2 , Thomas Peter 3 , David Keith 1 1 Harvard University, Cambridge, MA, U.S.A. ,
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Debra Weisenstein1, Sebastian Eastham2, Jianxiong Sheng3,
Steven Barrett2, Thomas Peter3, David Keith1
1 Harvard University, Cambridge, MA, U.S.A.,
2Massachusetts Institute of Technology, Cambridge, MA,
3ETH-Zurich, Zurich, Switzerland
28-30 October 2013
Catalytic 03 loss
Release of active species
Modeled SO2 + ATMOS Observation
H2SO4 + hv SO2
OCS removal in tropical mid-strat
as source of SO2
CS2, DMS, H2S convective transport to tropical mid-trop as source of SO2.
Scavenging removal efficiency?
APM Aerosol Sulfate
in boundary layer
Effective nucleation near tropical tropopause. Mixing of aged particles
Less nucleation near tropical tropopause. No aged stratospheric particles above.
SOCOL calculates too many particles above 20 km.
Equator, April and October
SOCOL overpredicts 1.02 mm extinction above 20 km.
45N, January and July
0.525 mm Extinction from SOCOL
at 20 km in September