10 research outputs found
The natural ocean acidification and fertilization event caused by the submarine eruption of El Hierro
Versión del edito
Severe Deoxygenation Event Caused by the 2011 Eruption of the Submarine Volcano Tagoro (El Hierro, Canary Islands)
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. 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. 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, 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.En prens
Comparing the relevance of N2-fixation versus nitrate eddy diffusion across the Atlantic ocean.
Water masses variability along transoceanic section 24.5ºN. Variables distribution and multiparameter analysis (OMP)
Informe de Campaña - Vulcana1015 - Octubre 2015
El objetivo principal del proyecto VULcanología CAnaria submariNA, VULCANA, es evaluar el grado de afección y la recuperación sobre el ecosistema marino del volcán submarino de la isla de El Hierro, haciéndolo extensible a otras regiones canarias de posible interés hidrotermal o vulcanológico. En este sentido, se ha investigado además el volcán de “enmedio”, entre las islas de Gran Canaria y Tenerife y el sur de La Palma (Fuentesanta). Para ello, se realizará un estudio completo de las propiedades físico-químicas, biológicas y geológicas en las áreas descrita
Informe de Campaña - Vulcana0316 - Marzo 2016
El objetivo principal del proyecto Vulcana (Vulcanología Canaria Submarina), es evaluar el grado de afección y la recuperación sobre el ecosistema marino del volcán submarino Tagoro de la isla de El Hierro, haciéndolo extensible a otras regiones de posible interés hidrotermal o vulcanológico. Para ello, se realizará un estudio completo de las propiedades físico-químicas, biológicas y geológicas en las áreas descritas.Versión de edito