Tropospheric volcanic carbon dioxide in the SWIR and MWIR spectral ranges.

Spinetti C., Buongiorno M.F., Romanello V.

IV - Geofisica e fisica dell'ambiente
GSSI Ex ISEF - Aula D - Mercoledì 25 h 16:30 - 19:00
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Degassing from volcanoes is a key pathway for volatile transfer from the Earth's interior to its exterior. Volcanic emissions are dominated by water vapour, carbon dioxide, sulfur dioxide and halogens, and comprise a mix of volatiles from the mantle, subducting slab and crustal sediments. Measuring carbon dioxide from space represents a challenge due to the high interest in knowing the distribution of this greenhouse gas and quantifying the natural sources. The high atmospheric background of carbon dioxide causes difficulties in the extraction of a volcanic contribution. In this contribution the hyperspectral technique already developed in the SWIR spectral range is presented and applied to airborne data acquired over Mt. Etna, Stromboli and Kilauea degassing volcanoes. In the MWIR spectral range the study of the band 4.81 um to detect and measure carbon dioxide is also presented. The performance of this band is tested in the frame of the new ASI/JPL MWIR-LWIR multispectral space mission to assess the requirements.

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