Title: Global atmospheric sulfur budget under volcanically quiescent conditions : aerosol-chemistry-climate model predictions and validation
Authors : Sheng, Jian-Xiong
Weisenstein, Debra K.
Luo, Bei-Ping
Rozanov, Eugene
Stenke, Andrea
Anet, Julien
Bingemer, Heinz
Peter, Thomas
Published in : Journal of Geophysical Research: Atmospheres
Volume(Issue) : 120
Issue : 1
Pages : 256
Pages to: 276
Publisher / Ed. Institution : Wiley
Issue Date: 2015
License (according to publishing contract) : Licence according to publishing contract
Type of review: Peer review (Publication)
Language : English
Subject (DDC) : 500: Natural sciences and mathematics
Abstract: The global atmospheric sulfur budget and its emission dependence have been investigated using the coupled aerosol‐chemistry‐climate model SOCOL‐AER. The aerosol module comprises gaseous and aqueous sulfur chemistry and comprehensive microphysics. The particle distribution is resolved by 40 size bins spanning radii from 0.39 nm to 3.2 μm, including size‐dependent particle composition. Aerosol radiative properties required by the climate model are calculated online from the aerosol module. The model successfully reproduces main features of stratospheric aerosols under nonvolcanic conditions, including aerosol extinctions compared to Stratospheric Aerosol and Gas Experiment II (SAGE II) and Halogen Occultation Experiment, and size distributions compared to in situ measurements. The calculated stratospheric aerosol burden is 109 Gg of sulfur, matching the SAGE II‐based estimate (112 Gg). In terms of fluxes through the tropopause, the stratospheric aerosol layer is due to about 43% primary tropospheric aerosol, 28% SO2, 23% carbonyl sulfide (OCS), 4% H2S, and 2% dimethyl sulfide (DMS). Turning off emissions of the short‐lived species SO2, H2S, and DMS shows that OCS alone still establishes about 56% of the original stratospheric aerosol burden. Further sensitivity simulations reveal that anticipated increases in anthropogenic SO2 emissions in China and India have a larger influence on stratospheric aerosols than the same increase in Western Europe or the U.S., due to deep convection in the western Pacific region. However, even a doubling of Chinese and Indian emissions is predicted to increase the stratospheric background aerosol burden only by 9%. In contrast, small to moderate volcanic eruptions, such as that of Nabro in 2011, may easily double the stratospheric aerosol loading.
Departement: School of Engineering
Organisational Unit: Centre for Aviation (ZAV)
Publication type: Article in scientific Journal
DOI : 10.1002/2014JD021985
ISSN: 2169897X
URI: https://digitalcollection.zhaw.ch/handle/11475/8905
Appears in Collections:Publikationen School of Engineering

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