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| Titel |
The 2011 Nabro eruption, a SO2 plume height analysis using IASI measurements |
| VerfasserIn |
L. Clarisse, P.-F. Coheur, N. Theys, D. Hurtmans, C. Clerbaux |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 14, no. 6 ; Nr. 14, no. 6 (2014-03-28), S.3095-3111 |
| Datensatznummer |
250118530
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| Publikation (Nr.) |
 copernicus.org/acp-14-3095-2014.pdf |
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| Zusammenfassung |
| In the wake of the June 2011 Nabro eruption, large stratospheric
plumes were observed by several instruments up to altitudes of
21 km, much higher than initial reported injection heights.
It has been debated whether deep convection associated with the
Asian Summer Monsoon anticyclone played a vital role in the vertical
transport of the plume. Here we present a new and fast SO2 height
retrieval algorithm for observations of the Infrared Atmospheric
Sounding Interferometer (IASI). A comprehensive validation with
forward trajectories and coincident CALIOP measurements is presented
which indicates an accuracy better than 2 km for plumes
below 20 km and SO2 columns up to the 1 DU level. We
use this new product to analyse the Nabro eruption. Our findings
indicate an initial plume located mainly between 15 and
17 km for which the lower parts underwent in succession
rapid descent and uplift, within the Asian Monsoon anticyclone
circulation, up to the stable thermal tropopause between 16 and
18 km, from where it slowly ascended further into the
stratosphere. Evidence is presented that emissions in the first week
of the eruption also contributed to the stratospheric sulfur
input. This includes a second eruption between 15 and 17 km
on the 16th and continuous emissions in the mid-troposphere of which
some were also entrained and lifted within the anticyclonic
circulation. |
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