Influence of Biogenic Secondary Organic Aerosol Formation Approaches on Atmospheric Chemistry |
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Authors: | Boris Bonn Mark G Lawrence |
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Institution: | (1) Max-Planck-Institute for Chemistry, Air Chemistry Department, P.O. Box 3060, D-55020 Mainz, Germany;(2) Present address: Physical Sciences Department, Helsinki University, P.O. Box 64, FIN-00014 Helsinki, Finland |
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Abstract: | Global secondary organic aerosol formation (SOA) is currently assumed to be between 11.2 and 270 Tg/yr. This range of uncertainty
is reflected in the gas-phase chemistry. In this study, we focus on the feedback of SOA formation on the concentrations of
most important trace gases such as ozone, and compare it to the impact of monoterpene gas-phase chemistry with a newly developed
reduced monoterpene mechanism (MMM) for either α- or β-pinene in the global chemistry transport model MATCH-MPIC. With this
set-up an uncertainty range of 3.5–4.0% increase in annually averaged tropospheric ozone was found to be caused by the gas-phase
chemistry of the investigated monoterpenes. Moreover, a strong feedback has been observed for NOx, HCHO, HNO3 and PAN. These observations are affected remarkably by different SOA formation approaches like partitioning or saturation
vapour pressure limitation and by the structure of the monoterpene used, e.g. reducing the impact on tropospheric ozone to
1.2–1.9% by using the partitioning approach versus the simulation with gas-phase chemistry only. Therefore, a consideration
of the individual processes associated with SOA formation seems to be necessary to reduce the uncertainty in SOA formation
and to understand the impact of VOCs on atmospheric chemistry.
An erratum to this article is available at . |
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Keywords: | secondary organic aerosol formation partitioning atmospheric chemistry monoterpenes |
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