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| Titel |
Simulation of stratospheric aerosol and its radiative forcing with the comprehensive chemistry - climate model EMAC based on satellite and aircraft observations |
| VerfasserIn |
Jennifer Schallock, Christoph Brühl, Jos Lelieveld  , Stephan Borrmann, Christine Bingen, Michael Höpfner |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250143060
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| Publikation (Nr.) |
 EGU/EGU2017-6749.pdf |
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| Zusammenfassung |
| Volcanic eruptions contribute strongly to the radiative effects on climate by stratospheric
aerosols. We have used satellite data, including anomalies in SO2 concentrations and optical
extinction, to analyze sulfate in the lower stratosphere. We present results of transient
simulations for the period 2002 to 2012, using the chemistry-climate model EMAC in
different configurations with interactive tropospheric and stratospheric aerosol processes. We
show that the volcanic emissions are essential to reproduce observed stratospheric aerosol
optical depth and compute the radiative forcing of climate. Analyzing newly available
3D-datasets of the MIPAS and GOMOS instruments on ENVISAT, with reduced data
gaps, increased the number of identified volcanic eruptions to about 230 events.
This includes strong volcanic eruptions injecting directly into the stratosphere and
medium and small volcanic eruptions reaching the stratosphere through transport
from the upper troposphere. This update improves the EMAC-simulated global
radiative forcing by stratospheric aerosol and aerosol optical depth. The availability of
in situ aircraft measurements in the UTLS region by M55-Geophysica from the
StratoClim project providing information on sulfate and silicate fraction and also size
distribution appears to be very important to define the optimal model configuration. |
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