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| Titel |
Whole-atmosphere aerosol-microphysics simulations of the Mt Pinatubo eruption: evaluation of simulated aerosol properties |
| VerfasserIn |
Sandip Dhomse, Graham Mann, Ken Carslaw, Kathryn Emmerson, Luke Abraham, Paul Telford, Peter Braesicke, Mohit Dalvi, Nicolas Bellouin |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250078896
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| Zusammenfassung |
| The Mount Pinatubo volcanic eruption in June 1991 injected between 14 and 20 Tg of
sulphur dioxide into the tropical stratosphere between about 21 and 28km altitude. Following
chemical conversion to sulphuric acid, the stratospheric aerosol layer thickened substantially
causing a strong radiative, dynamical and chemical perturbation to the Earth’s atmosphere.
We will present results from modelling experiments to simulate the evolution of the
stratospheric aerosol through the Pinatubo period. The simulations are carried out in the UK
Chemistry and Aerosol composition-climate model (UKCA) which extends the high-top
version of the HadGEM climate model. The UKCA model uses the GLOMAP-mode aerosol
microphysics module coupled with a stratospheric chemistry scheme including sulphur
chemistry.
We evaluate simulated size-resolved stratospheric aerosol properties against observations
from mid-latitude balloon-borne optical particle counter measurements. We also compare the
model to a range of satellite measurements through the Pinatubo period and quantify
simulated aerosol radiative forcings. We explore the sensitivity to varying several
uncertain parameters associated with the magnitude and altitude of the injected sulphur. |
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