Exploiting Sentinel-5P TROPOMI and Ground Sensor Data for the Detection of Volcanic SO<sub>2</sub> Plumes and Activity in 2018–2021 at Stromboli, Italy

Sulfur dioxide (SO<sub>2</sub>) 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...

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Autores principales:	Alessandra Cofano, Francesca Cigna, Luigi Santamaria Amato, Mario Siciliani de Cumis, Deodato Tapete
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	Sentinel-5P TROPOMI ultraviolet sulfur dioxide SO<sub>2</sub> plume degassing Chemical technology TP1-1185
Acceso en línea:	https://doaj.org/article/0185b007c67e4ebd88883aca6c5f2d52
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spelling	oai:doaj.org-article:0185b007c67e4ebd88883aca6c5f2d522021-11-11T19:02:01ZExploiting Sentinel-5P TROPOMI and Ground Sensor Data for the Detection of Volcanic SO<sub>2</sub> Plumes and Activity in 2018–2021 at Stromboli, Italy10.3390/s212169911424-8220https://doaj.org/article/0185b007c67e4ebd88883aca6c5f2d522021-10-01T00:00:00Zhttps://www.mdpi.com/1424-8220/21/21/6991https://doaj.org/toc/1424-8220Sulfur dioxide (SO<sub>2</sub>) 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 SO<sub>2</sub> 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 SO<sub>2</sub> 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 SO<sub>2</sub> 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 SO<sub>2</sub> 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 SO<sub>2</sub> VCD peaks at the volcano is trialed, and the detections are compared with the level of SO<sub>2</sub> flux measured at ground-based instrumentation. SO<sub>2</sub> 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 SO<sub>2</sub> total VCD peaks when they either (i) coincide with medium to very high SO<sub>2</sub> 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, SO<sub>2</sub> 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 SO<sub>2</sub> plume drift during the time lapses. The proposed analysis approach is successful in showing the SO<sub>2</sub> degassing associated with these events, and warning whenever the SO<sub>2</sub> VCD at Stromboli may be overestimated due to clustering with the plume of the Mount Etna volcano.Alessandra CofanoFrancesca CignaLuigi Santamaria AmatoMario Siciliani de CumisDeodato TapeteMDPI AGarticleSentinel-5PTROPOMIultravioletsulfur dioxideSO<sub>2</sub> plumedegassingChemical technologyTP1-1185ENSensors, Vol 21, Iss 6991, p 6991 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Sentinel-5P TROPOMI ultraviolet sulfur dioxide SO<sub>2</sub> plume degassing Chemical technology TP1-1185
spellingShingle	Sentinel-5P TROPOMI ultraviolet sulfur dioxide SO<sub>2</sub> plume degassing Chemical technology TP1-1185 Alessandra Cofano Francesca Cigna Luigi Santamaria Amato Mario Siciliani de Cumis Deodato Tapete Exploiting Sentinel-5P TROPOMI and Ground Sensor Data for the Detection of Volcanic SO<sub>2</sub> Plumes and Activity in 2018–2021 at Stromboli, Italy
description	Sulfur dioxide (SO<sub>2</sub>) 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 SO<sub>2</sub> 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 SO<sub>2</sub> 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 SO<sub>2</sub> 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 SO<sub>2</sub> 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 SO<sub>2</sub> VCD peaks at the volcano is trialed, and the detections are compared with the level of SO<sub>2</sub> flux measured at ground-based instrumentation. SO<sub>2</sub> 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 SO<sub>2</sub> total VCD peaks when they either (i) coincide with medium to very high SO<sub>2</sub> 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, SO<sub>2</sub> 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 SO<sub>2</sub> plume drift during the time lapses. The proposed analysis approach is successful in showing the SO<sub>2</sub> degassing associated with these events, and warning whenever the SO<sub>2</sub> VCD at Stromboli may be overestimated due to clustering with the plume of the Mount Etna volcano.
format	article
author	Alessandra Cofano Francesca Cigna Luigi Santamaria Amato Mario Siciliani de Cumis Deodato Tapete
author_facet	Alessandra Cofano Francesca Cigna Luigi Santamaria Amato Mario Siciliani de Cumis Deodato Tapete
author_sort	Alessandra Cofano
title	Exploiting Sentinel-5P TROPOMI and Ground Sensor Data for the Detection of Volcanic SO<sub>2</sub> Plumes and Activity in 2018–2021 at Stromboli, Italy
title_short	Exploiting Sentinel-5P TROPOMI and Ground Sensor Data for the Detection of Volcanic SO<sub>2</sub> Plumes and Activity in 2018–2021 at Stromboli, Italy
title_full	Exploiting Sentinel-5P TROPOMI and Ground Sensor Data for the Detection of Volcanic SO<sub>2</sub> Plumes and Activity in 2018–2021 at Stromboli, Italy
title_fullStr	Exploiting Sentinel-5P TROPOMI and Ground Sensor Data for the Detection of Volcanic SO<sub>2</sub> Plumes and Activity in 2018–2021 at Stromboli, Italy
title_full_unstemmed	Exploiting Sentinel-5P TROPOMI and Ground Sensor Data for the Detection of Volcanic SO<sub>2</sub> Plumes and Activity in 2018–2021 at Stromboli, Italy
title_sort	exploiting sentinel-5p tropomi and ground sensor data for the detection of volcanic so<sub>2</sub> plumes and activity in 2018–2021 at stromboli, italy
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/0185b007c67e4ebd88883aca6c5f2d52
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Exploiting Sentinel-5P TROPOMI and Ground Sensor Data for the Detection of Volcanic SO<sub>2</sub> Plumes and Activity in 2018–2021 at Stromboli, Italy

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