The Kallisti Limnes, carbon dioxide-accumulating subsea pools

Richard Camilli, Paraskevi Nomikou, Javier Escartín, Pere Ridao, Angelos Mallios, Stephanos P. Kilias, Ariadne Argyraki, Muriel Andreani, Valerie Ballu, Ricard Campos, Christine Deplus, Taoufic Gabsi, Rafael Garcia, Nuno Gracias, Natàlia Hurtós, Lluis Magí, Catherine Mével, Manuel Moreira, Narcís Palomeras, Olivier PotDavid Ribas, Lorraine Ruzié, Lorraine Ruzie, Dimitris Sakellariou

    Research output: Contribution to journalArticlepeer-review


    Natural CO2 releases from shallow marine hydrothermal vents are assumed to mix into the water column, and not accumulate into stratified seafloor pools. We present newly discovered shallow subsea pools located within the Santorini volcanic caldera of the Southern Aegean Sea, Greece, that accumulate CO2 emissions from geologic reservoirs. This type of hydrothermal seafloor pool, containing highly concentrated CO2, provides direct evidence of shallow benthic CO2 accumulations originating from sub-seafloor releases. Samples taken from within these acidic pools are devoid of calcifying organisms, and channel structures among the pools indicate gravity driven flow, suggesting that seafloor release of CO2 at this site may preferentially impact benthic ecosystems. These naturally occurring seafloor pools may provide a diagnostic indicator of incipient volcanic activity and can serve as an analog for studying CO2 leakage and benthic accumulations from subsea carbon capture and storage sites.
    Original languageEnglish
    Publication statusPublished - 2015


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