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| Titel |
Volcanic forcing for climate modeling: a new microphysics-based data set covering years 1600–present |
| VerfasserIn |
F. Arfeuille, D. Weisenstein, H. Mack, E. Rozanov, T. Peter, S. Brönnimann |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 10, no. 1 ; Nr. 10, no. 1 (2014-02-20), S.359-375 |
| Datensatznummer |
250116915
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| Publikation (Nr.) |
 copernicus.org/cp-10-359-2014.pdf |
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| Zusammenfassung |
| As the understanding and representation of the impacts of volcanic
eruptions on climate have improved in the last decades, uncertainties
in the stratospheric aerosol forcing from large eruptions are now linked not
only to visible optical depth estimates on a global scale but
also to details on the size, latitude and altitude distributions of
the stratospheric aerosols. Based on our understanding of these
uncertainties, we propose a new model-based approach to generating
a volcanic forcing for general circulation model (GCM) and
chemistry–climate model (CCM) simulations.
This new volcanic forcing, covering the 1600–present period, uses an
aerosol microphysical model to provide a realistic, physically
consistent treatment of the stratospheric sulfate aerosols. Twenty-six
eruptions were modeled individually using the latest available ice
cores aerosol mass estimates and historical data on the latitude and
date of eruptions. The evolution of aerosol spatial and size
distribution after the sulfur dioxide discharge are hence
characterized for each volcanic eruption. Large variations are seen in
hemispheric partitioning and size distributions in relation to
location/date of eruptions and injected SO2 masses.
Results for recent eruptions show reasonable agreement with observations.
By providing these new estimates of spatial distributions of shortwave and long-wave radiative
perturbations, this volcanic forcing may help to better constrain the climate model responses
to volcanic eruptions in the 1600–present period.
The final data set consists of 3-D values (with constant longitude) of
spectrally resolved extinction coefficients, single scattering
albedos and asymmetry factors calculated for different wavelength
bands upon request. Surface area densities for
heterogeneous chemistry are also provided. |
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