Day 4

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Paper title Volcanic Carbon Dioxide Point Source Retrieval by using PRISMA Hyperspectral Data
  1. Claudia Spinetti Istituto Nazionale di Geofisica e Vulcanologia (INGV), Rome, Italy Speaker
  2. Vito Romaniello INGV
  3. Maria Fabrizia Buongiorno INGV
  4. Malvina Silvestri INGV
Form of presentation Poster
  • A1. Atmosphere
    • A1.04 Greenhouse Gases
Abstract text A large and fast view of volcanic plumes as detection and measurement of volatiles components exolving from craters is possible by using hyperspectral remote sensing if their absorption bands are in the sensor spectral range. In the present study the developed algorithm to calculate CO2 columnar abundance in tropospheric volcanic plume is presented. The algorithm is based on a modified CIBR 'Continuum Interpolated Band Ratio' remote sensing technique based on a differential absorption technique that was initially developed to calculate water vapor columnar abundance. The retrieval techniques exploit spectroscopy measurements by analysing gases absorptions features in the SWIR (Short Wave InfraRed) spectral range, in particular the Carbon Dioxide absorption in the spectral range of 2 microns. Specifically, PRISMA (PRecursore IperSpettrale della Missione Applicativa) acquisition data are used for gases retrieval purposes. The PRISMA space mission was launched by the Italian Space Agency (ASI) on March 22, 2019; the on-board spectrometers are able to measure in two spectral range: the VNIR (0.4-1.0 µm) and SWIR (0.9-2.5 µm) spectral ranges, with a ground spatial resolution of 30 m. In this study, the inversion techniques is applied to PRISMA data in order to derive the PRISMA performances for CO2 detection and retrieval. Simulations of the “Top Of Atmosphere (TOA)” radiance have been performed by using real input data to reproduce the scene acquired by PRISMA over a volcanic point sources: actual atmospheric background of CO2 (~400 ppm) and vertical atmospheric profiles of pressure, temperature and humidity obtained from probe balloons has been used in the radiative transfer model. The results will be shown in the considered test sites of Campi Flegrei caldera in the Campania region (located in southern Italy) and Lusi volcanoes (located in Java island region of Indonesia) both characterized by a persistent degassing plume present even if they show a very different mechanism of volcanic emissions: the first based on a hydrothermal system and the second based on a mud cold mechanism of volcanic emission of gases in troposphere.