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Small-scale volcanic aerosols variability, processes and direct radiative impact at Mount Etna during the EPL-RADIO campaigns

Abstract : The aerosol properties of Mount Etna’s passive degassing plume and its short-term processes and radiative impact were studied in detail during the EPL-RADIO campaigns (summer 2016–2017), using a synergistic combination of observations and radiative transfer modelling. Summit observations show extremely high particulate matter concentrations. Using portable photometers, the first mapping of small-scale (within ∼20km from the degassing craters) spatial variability of the average size and coarse-to-fine burden proportion of volcanic aerosols is obtained. A substantial variability of the plume properties is found at these spatial scales, revealing that processes (e.g. new particle formation and/or coarse aerosols sedimentation) are at play, which are not represented with current regional scale modelling and satellite observations. Statistically significant progressively smaller particles and decreasing coarse-to-fine particles burden proportion are found along plume dispersion. Vertical structures of typical passive degassing plumes are also obtained using observations from a fixed LiDAR station constrained with quasi-simultaneous photometric observations. These observations are used as input to radiative transfer calculations, to obtain the shortwave top of the atmosphere (TOA) and surface radiative effect of the plume. For a plume with an ultraviolet aerosol optical depth of 0.12–0.14, daily average radiative forcings of −4.5 and −7.0W/m2, at TOA and surface, are found at a fixed location ∼7km downwind the degassing craters. This is the first available estimation in the literature of the local radiative impact of a passive degassing volcanic plume.
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https://hal.univ-lille.fr/hal-02960829
Contributeur : Lilloa Université de Lille <>
Soumis le : mercredi 21 octobre 2020 - 10:06:37
Dernière modification le : samedi 24 octobre 2020 - 03:37:12

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Pasquale Sellitto, Giuseppe Salerno, Alessandro La Spina, Tommaso Caltabiano, Simona Scollo, et al.. Small-scale volcanic aerosols variability, processes and direct radiative impact at Mount Etna during the EPL-RADIO campaigns. Scientific Reports, Nature Publishing Group, 2020, Scientific Reports, 10 (1), ⟨10.1038/s41598-020-71635-1⟩. ⟨hal-02960829v2⟩

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