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| Titel |
Geoengineered sulfate aerosol - micropysical evolution depending on emission parameters |
| VerfasserIn |
Ulrike Niemeier, Hauke Schmidt, Claudia Timmreck |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250039624
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| Zusammenfassung |
| In recent years, several methods have been suggested for "geoengineering" the climate to
limit global temperature increase. One of these geoengineering techniques follows the natural
example of volcanic eruptions, emitting large amounts of sulfur dioxide (SO2) into the
stratosphere. Chemical and microphysical reactions cause the formation of sulfate aerosols,
which reduces the incoming solar radiation.
Recently, several studies on this topic have been performed but only one so far
(Heckendorn et al. 2009) included an aerosol microphysical model. This leaves
the sulfate particle size and the related radiative forcing open for a wide range of
assumptions. In our study we aim to clarify the relation between SO2 emissions and the
evolution of sulfate aerosol. We used the middle atmosphere general circulation model
MAECHAM5 including the global aerosol module HAM. HAM calculates the aerosol
microphysics of sulfate and other species and their source and sink processes. The model
setup has been validated for the Mt.Pinatubo eruption, showing good agreement
with satellite data. We performed a set of geoengineering scenarios with different
emission strengths and heights of SO2 injection. The results show a dependency of the
microphysical parameters, like particle radius, surface area density and in particular of the
radiative forcing of the geoengineered aerosol on the prescribed emission scenarios. |
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