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Title: Severe deoxygenation event caused by the 2011 eruption of the submarine volcano Tagoro (El Hierro, Canary Islands)
Authors: González Vega, Alba 
Callery, Izar
Arrieta López de Uralde, Jesús María 
Santana Casiano, Magdalena 
Domínguez-Yanes, J. Francisco
Fraile Nuez, Eugenio 
UNESCO Clasification: 250621 Vulcanología
251002 Oceanografía química
Keywords: Tagoro
Submarine eruption
Dissolved oxygen
Canary Islands
Issue Date: 2023
Publisher: Servicio de Publicaciones y Difusión Científica de la Universidad de Las Palmas de Gran Canaria (ULPGC) 
Project: "Volcanic Eruption At El Hierro Island, Sensitivity And Recovery Of The Marine Ecosystem" 
VULCANO-II (CTM2014-51837-R) 
BIMBACHE (IEO-2011-2012) 
RAPROCAN-III (IEO-2010-2012) 
VULCANA-I (IEO-2015-2017) 
VULCANA-II (IEO-2018-2020) 
Conference: XXI International Iberian Marine Chemistry (SIQUIMAR 2022) 
Abstract: The shallow, near-shore submarine volcano Tagoro erupted in October 2011 at the Mar de las Calmas marine reserve, south of El Hierro island. The injection of lava into the ocean had its strongest episode during November 2011 and lasted until March 2012 (Fraile-Nuez et al., 2012). During this time, in situ measurements of dissolved oxygen were carried out, using a continuous oxygen sensor constantly calibrated with water samples. A severe deoxygenation was observed in the area, particularly during October-November 2011, which was one of the main causes of the high mortality observed among the local marine ecosystem (Santana-Casiano et al., 2013). The measured O2 concentrations were as low as 7.71 μmol kg-1, which represents a -96% decrease with respect to unaffected waters. The oxygen depletion was found in the first 250 m of the water column, with peaks between 70-120 m depth. The deoxygenated plume covered an area of at least 464 km2, distributed particularly south and south-west of the volcano, with occasional patches found north of the island. The oxygen levels were also monitored through the following years, during the degassing stage of the volcano, when oxygen depletion was no longer observed. Additionally, during the eruption, an island-generated anticyclonic eddy interacted with the volcanic plume and transported it for at least 80 km (Eugenio et al., 2014), where the O2 measurements still showed a -8% decrease after mixing and dilution. This feature draws attention to the permanence and transport of volcanic plumes far away from their source and long after the emission.
ISBN: 978-84-9042-478-0
Source: Abstracts XXI International Iberian Marine Chemistry (SIQUIMAR 2022) / coordinación, María Esther Torres Padrón, p. 22-23
Appears in Collections:Ponencias
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