EGU2020-8337
https://doi.org/10.5194/egusphere-egu2020-8337
EGU General Assembly 2020
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

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

Pasquale Sellitto1, Giuseppe Salerno2, Alessandro La Spina2, Tommaso Caltabiano2, Simona Scollo2, Antonella Boselli3, Giuseppe Leto4, Ricardo Zanmar Sanchez4, Alessia Sannino5, Suzanne Crumeyrolle6, Benjamin Hanoune7, Chiara Giorio8, Salvatore Giammanco2, Tjarda Roberts9, Alcide di Sarra10, Bernard Legras11, and Pierre Briole12
Pasquale Sellitto et al.
  • 1Laboratoire Interuniversitaire des Systèmes Atmosphériques, Université Paris-Est Créteil, France (pasquale.sellitto@lisa.u-pec.fr)
  • 2Istituto Nazionale di Geofisica e Vulcanologia, Osservatorio Etneo, Catania, Italy
  • 3Consiglio Nazionale delle Ricerche, Istituto di Metodologie per l’Analisi Ambientale, Tito Scalo (Potenza), Italy
  • 4Istituto Nazionale di AstroFisica. INAF Osservatorio Astrofisico di Catania, Catania, Italy
  • 5Dipartimento di Fisica, Università degli Studi di Napoli Federico II, Naples, Italy
  • 6Université de Lille, UMR CNRS 8518 - LOA - Laboratoire d’Optique Atmosphérique, Lille, France
  • 7Université de Lille, UMR CNRS 8522 - PC2A - Physico-Chimie des Processus de Combustion et de l’Atmosphère, Lille, France
  • 8Dipartimento di Scienze Chimiche, Università degli Studi di Padova, Padua, Italy
  • 9Laboratoire de Physique et Chimie de l’Environnement et de l’Espace - LPCEE, UMR 7328, CNRS-Université d'Orléans, Orléans, France
  • 10ENEA, Laboratory for Observations and Analyses of the Earth and Climate (SSPT-PROTER-OAC), Rome, Italy
  • 11Laboratoire de Météorologie Dynamique - LMD, UMR CNRS 8539, École Normale Supérieure, Institut Pierre Simon Laplace, Paris, France
  • 12Laboratoire de Géologie, École Normale Supérieure, Paris, France

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/REFLECT campaigns (summer 2016, 17 and 19), using a synergistic combination of remote-sensing and in situ observations, and radiative transfer modelling. Summit observations show extremely high particulate matter concentrations, with no evidence of secondary sulphate aerosols (SA) formation. Marked indications of secondary SA formation, i.e. by the conversion of volcanic SO2 emissions, are found at larger spatial scales (<20 km downwind craters). Using portable photometers, the first mapping of small-scale spatial variability of the average size and burden of volcanic aerosols is obtained, as well as different longitudinal, perpendicular and vertical sections. A substantial variability of the plume properties is found at these spatial scales, revealing that processes (e.g. new particle formation and coarse aerosols sedimentation) are at play, which are not represented with current regional scale modelling and satellite observations. 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 effects of the plume. Moreover, the radiative impact of Mount Etna’s emissions is studied using a medium-term time series (a few months during summer 2019) of coupled aerosol optical properties and surface radiative flux at a fixed station on Etna’s eastern flank. These are the first available estimations in the literature of the radiative impact of a passive degassing volcanic plume and are here critically discussed. Cases of co-existent volcanic aerosol layers and aerosols from other sources (Saharan dust transport events, wildfire from South Italy and marine aerosols) are also presented and discussed.

How to cite: Sellitto, P., Salerno, G., La Spina, A., Caltabiano, T., Scollo, S., Boselli, A., Leto, G., Zanmar Sanchez, R., Sannino, A., Crumeyrolle, S., Hanoune, B., Giorio, C., Giammanco, S., Roberts, T., di Sarra, A., Legras, B., and Briole, P.: Small-scale volcanic aerosols variability, processes and direct radiative impact at Mount Etna during the EPL-RADIO/REFLECT campaigns, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-8337, https://doi.org/10.5194/egusphere-egu2020-8337, 2020

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