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| Titel |
Radiative forcing by stratospheric aerosol in a CCM with interactive aerosol module |
| VerfasserIn |
Christoph Brühl, Jos Lelieveld  , Holger Tost, Benedikt Steil, Michael Höpfner |
| 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 |
250074602
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| Zusammenfassung |
| Multiyear studies with the atmospheric chemistry general circulation model EMAC with the
aerosol module GMXe demonstrate that stratospheric aerosol formation is controlled by
COS oxidation and SO2 injected by low-latitude volcanic eruptions. The model
consistently uses the same parameters in the troposphere and stratosphere for 7 aerosol
modes applied. Calculated radiative heating by aerosol feeds back to stratospheric
dynamics. Radiative forcing by stratospheric aerosol can be diagnosed separately. The
simulations include the medium size tropical eruptions in 2003, 2005 and 2006 but
also the major eruption of Pinatubo in 1991. We show that calculated radiative
forcing by stratospheric aerosol agrees well with the corresponding satellite derived
quantity and that the medium size tropical eruptions should not be neglected in
climate simulations. Changes in temperature, dynamics and tracer transport due to
interactive aerosol will be also presented. We show also that calculated aerosol and SO2
concentrations are consistent with the observations by SAGE and by MIPAS on ENVISAT. |
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