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| Titel |
Quantifying the impact of moderate volcanic eruptions on the stratosphere |
| VerfasserIn |
Thibaut Lurton, Fabrice Jegou, Gwenaël Berthet, Jean-Baptiste Renard, Damien Vignelles, Nelson Begue, Thierry Portafaix, Hassan Bencherif, Benoît Couté, Vincent Duverger, Guillaume Payen, Jean-Marc Metzger, Françoise Posny |
| 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 |
250127765
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| Publikation (Nr.) |
 EGU/EGU2016-7673.pdf |
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| Zusammenfassung |
| We have investigated the impact of two recent moderate volcanic eruptions upon the sulphur
dioxide and sulphate loading in the stratosphere, with the use of the CESM numerical global
model. Through the use of the WACCM/CARMA module in CESM, which provides with a
comprehensive modelling of the sulphur cycle, and at a ∼2˚ spatial resolution, we have
investigated the impacts of the eruptions of the Kelud (13 February 2014, 7˚ S, 112˚ E) and
Calbuco (22 April 2015, 41˚ S, 72˚ W) volcanoes on the lower stratosphere. The input SO2
quantities and altitudes of injection were estimated from satellite observations,
and correspond in both cases to several hundreds of kT of SO2 injected directly at
upper troposphere/lower stratosphere heights, over a few kilometres of altitude
span.
Our results have been compared with satellite measurements, from IASI for SO2, and the
CALIOP space-borne lidar for aerosols. We also provide cross-comparisons with in-situ
measurements performed above La Réunion Island (21˚ S, 55˚ E), first comparing our
simulation results to the data obtained through the launch of a balloon-borne light
optical aerosol counter (LOAC), and also by cross-comparison with in-situ lidar
measurements.
To investigate the role of dynamical barriers around those volcanic events, our
simulations have been run using two different sets of meteorological forcing data (namely
MERRA vs. ERA-Interim), which can differ in that respect, especially regarding the vertical
advection at tropical latitudes. Our overall aim is to assess the impact of such moderate
eruptions over the lower stratosphere, on the one hand chemically, and on the other hand in
terms of radiative effects. |
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