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| Titel |
Attribution of different volcano eruptions to injected SO2 from satellite data and implications for radiative forcing calculated by a comprehensive CCM |
| VerfasserIn |
Jennifer Schallock, Christoph Brühl, Jos Lelieveld  , Christine Bingen, Michael Höpfner |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250127566
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| Publikation (Nr.) |
 EGU/EGU2016-7458.pdf |
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| Zusammenfassung |
| Volcanic eruptions have important radiative effects on climate through impacts on the
stratospheric aerosol layer. They have been estimated by analyzing satellite data for
anomalies in stratospheric SO2 concentration and aerosol extinction. For this work we used
the data of different satellites: MIPAS, GOMOS, OMI and TOMS to cover the time period
2002-2012. It is important to use multiple satellite data sources to compensate for data gaps
of individual sensors. The result is a list of about 150 volcanic eruptions (small to medium)
that reach the stratosphere directly or by transport from the upper troposphere.
Some eruptions have only a regional effect while other SO2 plumes are transported
globally. This depends on injection height, latitude, season and circulation patterns
(e.g. monsoon). Because of dispersion and advection it is difficult to identify single
eruptions in a 2D data field with monthly zonal means, therefore, it is important to use
3D data fields. We find that a temporal resolution of about 5 days and a spatial
resolution of 60 degrees longitude and 10 degrees latitude is a good compromise
to have sufficient coverage. The volcanic SO2 data in different complexity were
used in transient simulations with the atmospheric chemistry circulation model
EMAC. It is demonstrated that the neglect of smaller eruptions or the application of
only the MIPAS data set significantly underestimates volcanic radiative forcing. |
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