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• W4322005013 abstract "During the extended activity of Mount Etna volcano in February-April 2021, three distinct paroxysmal events took place from 21 to 26 February, which were associated with a very uncommon transport of the injected upper-tropospheric plumes towards the north. A major Saharan dust outbreak to central Europe occurred in the same period. Using a synergy of observations and modelling, we characterise the three-dimensional dispersion of these volcanic plumes and we disentangle their optical and radiative signature from the simultaneous Saharan dust transport. In the region of interest for our study, the volcanic and the dust plumes remain completely vertically-separated, thus facilitating the detection and spatiotemporal characterisation of the dispersion, properties and radiative impacts of these two different aerosol plumes, using vertically-resolved observations. With a satellite-based source inversion, we estimate the emitted sulphur dioxide (SO2) mass at an integrated value of 55 kt and plumes injections at up to 12 km altitudes, which qualifies this series as an extreme event for Mount Etna activity spectrum. Then, we combine Lagrangian dispersion modelling, initialised with measured temporally-resolved SO2 emission fluxes and altitudes, with satellite observations to track the dispersion of the individual volcanic and dust plumes. The general transport towards the north allowed the height-resolved downwind monitoring of the volcanic and dust plumes at selected observatories in France, Italy and Israel, using LiDARs and photometric aerosol observations. A specific effort has been dedicated to the characterisation of the volcanic aerosol plumes. Volcanic-specific aerosol optical depths in the visible spectral range ranging from about 0.004 to 0.03 and local daily average shortwave radiative forcing ranging from about -0.2 to -1.2 W/m2 (at the top of atmosphere) and from about -0.2 to -3.0 W/m2 (at the surface) are found. The composition (possible presence of ash), aerosol optical depth and radiative forcing of the volcanic plumes has a large inter- and intra-plume variability and thus depend strongly on the position of the sampled section of the plumes. The dust optical depth and radiative impact largely outweigh volcanic aerosols when the two plumes are co-located, for this event. This case study points at the complexity of the Mediterranean aerosol environment and pave the way to future studies at longer timescales, exploiting the available observational and modelling capabilities and their synergies." @default.
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• W4322005013 date "2023-05-15" @default.
• W4322005013 modified "2023-10-16" @default.
• W4322005013 title "A case study of two simultaneous extreme aerosol events in the Mediterranean: The Mount Etna series of eruptions and major Saharan dust event in February 202" @default.
• W4322005013 doi "https://doi.org/10.5194/egusphere-egu23-8281" @default.
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