DOI: 10.1029/2009jd012786. Detection of volcanic SO2, ash, and H2SO4 using the Infrared Atmospheric Sounding Interferometer (IASI)

Detection of volcanic SO2, ash, and H2SO4 using the Infrared Atmospheric Sounding Interferometer (IASI)

10.1029/2009jd012786

Crossref journal-article

American Geophysical Union (AGU)

Journal of Geophysical Research: Atmospheres (13)

Abstract

In this work we use infrared spectra recorded by the Infrared Atmospheric Sounding Interferometer (IASI) to characterize the emissions from the Mount Kasatochi volcanic eruption on 7 and 8 August 2008. We first derive the total atmospheric load of sulfur dioxide (SO2) and its evolution over time. For the initial plume, we found values over 1.7 Tg of SO2, making it the largest eruption since the 1991 eruptions of Pinatubo and Hudson. Vertical profiles were retrieved using a line‐by‐line radiative transfer model and an inversion procedure based on the optimal estimation method (OEM). For the Kasatochi eruption, we found a plume altitude of 12.5 ± 4 km. Taking advantage of IASI's broad spectral coverage, we used the ν3 band (∼1362 cm−1) and, for the first time, the ν1 + ν3 band (∼2500 cm−1) of SO2 for the retrievals. While the ν3 band saturates easily for high SO2 concentrations, preventing accurate retrieval, the ν1 + ν3 band has a much higher saturation threshold. We also analyzed the broadband signature observed in the radiance spectra in the 1072–1215 cm−1 range associated with the presence of aerosols. In the initial volcanic plume the signature matches closely that of mineral ash, while by 10 August most mineral ash is undetectable, and the extinction is shown to match closely the absorption spectrum of liquid H2SO4 drops. The extinction by sulphuric acid particles was confirmed by comparing spectra before and a month after the eruption, providing the first spectral detection of such aerosols from nadir view radiance data.

Bibliography

Karagulian, F., Clarisse, L., Clerbaux, C., Prata, A. J., Hurtmans, D., & Coheur, P. F. (2010). Detection of volcanic SO2, ash, and H2SO4 using the Infrared Atmospheric Sounding Interferometer (IASI). Journal of Geophysical Research: Atmospheres, 115(D2). Portico.

Authors 6

F. Karagulian (first)
L. Clarisse (additional)
C. Clerbaux (additional)
A. J. Prata (additional)
D. Hurtmans (additional)
P. F. Coheur (additional)

References 36 Referenced 115

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Dates

Type	When
Created	15 years, 5 months ago (Feb. 26, 2010, 4 p.m.)
Deposited	1 year, 9 months ago (Nov. 2, 2023, 3:05 a.m.)
Indexed	3 weeks, 5 days ago (July 30, 2025, 6:28 a.m.)
Issued	15 years, 6 months ago (Jan. 27, 2010)
Published	15 years, 6 months ago (Jan. 27, 2010)
Published Online	15 years, 5 months ago (Feb. 27, 2010)
Published Print	15 years, 6 months ago (Jan. 27, 2010)

Funders 0

None

BibTeX

@article{Karagulian_2010, title={Detection of volcanic SO2, ash, and H2SO4 using the Infrared Atmospheric Sounding Interferometer (IASI)}, volume={115}, ISSN={0148-0227}, url={http://dx.doi.org/10.1029/2009jd012786}, DOI={10.1029/2009jd012786}, number={D2}, journal={Journal of Geophysical Research: Atmospheres}, publisher={American Geophysical Union (AGU)}, author={Karagulian, F. and Clarisse, L. and Clerbaux, C. and Prata, A. J. and Hurtmans, D. and Coheur, P. F.}, year={2010}, month=jan }

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