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| Titel |
Tracking and quantifying volcanic SO2 with IASI, the September 2007 eruption at Jebel at Tair |
| VerfasserIn |
L. Clarisse, P. F. Coheur, A. J. Prata, D. Hurtmans, A. Razavi, T. Phulpin, J. Hadji-Lazaro, 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 ; 8, no. 24 ; Nr. 8, no. 24 (2008-12-22), S.7723-7734 |
| Datensatznummer |
250006529
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| Publikation (Nr.) |
 copernicus.org/acp-8-7723-2008.pdf |
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| Zusammenfassung |
| In this paper we demonstrate the potential of the infrared Fourier transform
spectrometer IASI in analysing volcanic eruptions, using the September 2007
eruption at Jebel at Tair as an illustrative example. Detailed radiative
transfer calculations are presented, simulating IASI-like transmittance
spectra for a variety of volcanic plumes. We analyse the sensitivity of IASI
to SO2 at different altitudes and demonstrate that IASI is in principle
capable of sensing SO2 down to the surface. Using the brightness
temperature difference of well chosen SO2 channels as a filter, we are
able to track the plume of the Jebel at Tair eruption for 12 days, on a par
with state of the art UV sounders. A method is presented for quickly
estimating the altitude of a volcanic plume based on the relative intensities
of the SO2 absorption lines. Despite recent advances, it is still very
challenging to retrieve vertical profiles of SO2 from nadir viewing
satellites. Currently the most accurate profiles in nadir are retrieved using
backtracking of the plume with atmospheric transport models. Via full inverse
retrievals using the optimal estimation method, we show the possibility of
extracting medium coarse vertical profiles from IASI data. The retrieval
allows us to present an evolution of the total mass of SO2 in the plume
for the Jebel at Tair eruption. An analytical relation is derived between
brightness temperature differences and concentrations, which fits the
experimental data very well. The spectral range of IASI also allows retrieval
of volcanic aerosols. In the initial plume of the Jebel at Tair eruption,
volcanic aerosols were found in the form of ice particles, for which we
derived particle sizes. |
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