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Article

Exploiting Sentinel-5P TROPOMI and Ground Sensor Data for the Detection of Volcanic SO2 Plumes and Activity in 2018–2021 at Stromboli, Italy

1
Italian Space Agency (ASI), Via del Politecnico s.n.c., 00133 Rome, Italy
2
Mathematics Department, University of Rome Tor Vergata, Via della Ricerca Scientifica 1, 00133 Rome, Italy
3
Institute for Space Astrophysics and Planetology (IAPS), National Institute for Astrophysics (INAF), Via del Fosso del Cavaliere 100, 00133 Rome, Italy
4
Institute of Atmospheric Sciences and Climate (ISAC), National Research Council (CNR), Via del Fosso del Cavaliere 100, 00133 Rome, Italy
5
Italian Space Agency (ASI), Località Terlecchia s.n.c., 75100 Matera, Italy
*
Author to whom correspondence should be addressed.
Academic Editor: Jason K. Levy
Sensors 2021, 21(21), 6991; https://doi.org/10.3390/s21216991
Received: 25 August 2021 / Revised: 15 October 2021 / Accepted: 18 October 2021 / Published: 21 October 2021
(This article belongs to the Section Remote Sensors)
Sulfur dioxide (SO2) degassing at Strombolian volcanoes is directly associated with magmatic activity, thus its monitoring can inform about the style and intensity of eruptions. The Stromboli volcano in southern Italy is used as a test case to demonstrate that the TROPOspheric Monitoring Instrument (TROPOMI) onboard the Copernicus Sentinel-5 Precursor (Sentinel-5P) satellite has the suitable spatial resolution and sensitivity to carry out local-scale SO2 monitoring of relatively small-size, nearly point-wise volcanic sources, and distinguish periods of different activity intensity. The entire dataset consisting of TROPOMI Level 2 SO2 geophysical products from UV sensor data collected over Stromboli from 6 May 2018 to 31 May 2021 is processed with purposely adapted Python scripts. A methodological workflow is developed to encompass the extraction of total SO2 Vertical Column Density (VCD) at given coordinates (including conditional VCD for three different hypothetical peaks at 0–1, 7 and 15 km), as well as filtering by quality in compliance with the Sentinel-5P Validation Team’s recommendations. The comparison of total SO2 VCD time series for the main crater and across different averaging windows (3 × 3, 5 × 5 and 4 × 2) proves the correctness of the adopted spatial sampling criterion, and practical recommendations are proposed for further implementation in similar volcanic environments. An approach for detecting SO2 VCD peaks at the volcano is trialed, and the detections are compared with the level of SO2 flux measured at ground-based instrumentation. SO2 time series analysis is complemented with information provided by contextual Sentinel-2 multispectral (in the visible, near and short-wave infrared) and Suomi NPP VIIRS observations. The aim is to correctly interpret SO2 total VCD peaks when they either (i) coincide with medium to very high SO2 emissions as measured in situ and known from volcanological observatory bulletins, or (ii) occur outside periods of significant emissions despite signs of activity visible in Sentinel-2 data. Finally, SO2 VCD peaks in the time series are further investigated through daily time lapses during the paroxysms in July–August 2019, major explosions in August 2020 and a more recent period of activity in May 2021. Hourly wind records from ECMWF Reanalysis v5 (ERA5) data are used to identify local wind direction and SO2 plume drift during the time lapses. The proposed analysis approach is successful in showing the SO2 degassing associated with these events, and warning whenever the SO2 VCD at Stromboli may be overestimated due to clustering with the plume of the Mount Etna volcano. View Full-Text
Keywords: Sentinel-5P; TROPOMI; ultraviolet; sulfur dioxide; SO2 plume; degassing; volcanic activity; Stromboli Sentinel-5P; TROPOMI; ultraviolet; sulfur dioxide; SO2 plume; degassing; volcanic activity; Stromboli
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MDPI and ACS Style

Cofano, A.; Cigna, F.; Santamaria Amato, L.; Siciliani de Cumis, M.; Tapete, D. Exploiting Sentinel-5P TROPOMI and Ground Sensor Data for the Detection of Volcanic SO2 Plumes and Activity in 2018–2021 at Stromboli, Italy. Sensors 2021, 21, 6991. https://doi.org/10.3390/s21216991

AMA Style

Cofano A, Cigna F, Santamaria Amato L, Siciliani de Cumis M, Tapete D. Exploiting Sentinel-5P TROPOMI and Ground Sensor Data for the Detection of Volcanic SO2 Plumes and Activity in 2018–2021 at Stromboli, Italy. Sensors. 2021; 21(21):6991. https://doi.org/10.3390/s21216991

Chicago/Turabian Style

Cofano, Alessandra, Francesca Cigna, Luigi Santamaria Amato, Mario Siciliani de Cumis, and Deodato Tapete. 2021. "Exploiting Sentinel-5P TROPOMI and Ground Sensor Data for the Detection of Volcanic SO2 Plumes and Activity in 2018–2021 at Stromboli, Italy" Sensors 21, no. 21: 6991. https://doi.org/10.3390/s21216991

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