期刊
GEOPHYSICAL RESEARCH LETTERS
卷 38, 期 -, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2011GL047402
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资金
- Postdoctoral Researcher and Research Associate with F. R. S.-FNRS [4511.08]
- Belgian State Federal Office for Scientific, Technical and Cultural Affairs
- European Space Agency
- 'Actions de Recherche Concertees' (Communaute Francaise de Belgique)
Hydrogen sulphide (H(2)S) is one of the main trace gases released from volcanoes with yearly global emissions estimated between 1 and 37 Tg. With sulfur dioxide (SO(2), 15-21 Tg/year), it dominates the volcanic sulfur budget, and the emission ratio H(2)S:SO(2) is an important geochemical probe for studying source conditions, sulfur chemistry and magma-water interactions. Contrary to SO(2), measurements of H(2)S are sparse and difficult. Here we report the first measurements of a large H(2)S plume from space. Observations were made with the infrared sounder IASI of the volcanic plume released after the 7-8 August 2008 eruption of Kasatochi volcano. The eruption was characterized by 5 consecutive explosive events. The first events were phreatomagmatic producing a plume rich in water vapor and poor in ash and SO(2). We show that the observed H(2)S plume, calculated at 29 +/- 10 kT with integrated columns exceeding 140 +/- 25 Dobson Units (DU), is likely associated with these first explosions. H(2)S:SO(2) ratios with maximum values of 12 +/- 2 are found, representative of redox conditions in the hydrothermal envelop. With a detection threshold of 25 DU, future space observations of H(2)S plumes are certain. These will be important for improving the atmospheric sulfur budget and characterizing the H(2)S:SO(2) fingerprint of different eruptions. Citation: Clarisse, L., P.-F. Coheur, S. Chefdeville, J.-L. Lacour, D. Hurtmans, and C. Clerbaux (2011), Infrared satellite observations of hydrogen sulfide in the volcanic plume of the August 2008 Kasatochi eruption, Geophys. Res. Lett., 38, L10804, doi:10.1029/2011GL047402.
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