Geochemical survey of Levante Bay,Vulcano Island (Italy), a natural laboratory for the study of ocean acidification |
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Authors: | F Boatta W D’Alessandro AL Gagliano M Liotta M Milazzo R Rodolfo-Metalpa JM Hall-Spencer F Parello |
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Institution: | 1. DiSTeM University of Palermo, CoNISMa, via Archirafi, 36, 90123 Palermo, Italy;2. Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Palermo, via U. La Malfa 153, 90146 Palermo, Italy;3. Marine Biology and Ecology Research Centre, University of Plymouth, Plymouth PL4 8AA, UK |
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Abstract: | Shallow submarine gas vents in Levante Bay, Vulcano Island (Italy), emit around 3.6t CO2 per day providing a natural laboratory for the study of biogeochemical processes related to seabed CO2 leaks and ocean acidification. The main physico-chemical parameters (T, pH and Eh) were measured at more than 70 stations with 40 seawater samples were collected for chemical analyses. The main gas vent area had high concentrations of dissolved hydrothermal gases, low pH and negative redox values all of which returned to normal seawater values at distances of about 400 m from the main vents. Much of the bay around the vents is corrosive to calcium carbonate; the north shore has a gradient in seawater carbonate chemistry that is well suited to studies of the effects of long-term increases in CO2 levels. This shoreline lacks toxic compounds (such as H2S) and has a gradient in carbonate saturation states. |
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Keywords: | Ocean acidification Carbon capture and storage Marine geochemistry Carbonate saturation state Volcanic vents Carbon dioxide |
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