Diverse methane concentrations in anoxic brines and underlying sediments,eastern Mediterranean Sea |
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| Institution: | 1. Israel Oceanographic and Limnological Research, National Institute on Oceanography, Haifa, Israel;2. Department of Maritime Civilizations, The Charney School for Marine Science, University of Haifa, Israel;3. Israel Oceanographic and Limnological Research, The Kinneret Limnological Laboratory, Migdal 14950, Israel;4. The Jacob Blaustein Institutes for Desert Research, Zuckerberg Institute for Water Research (ZIWR), Ben-Gurion University of the Negev, Sede Boqer Campus, 84990, Israel;1. MARE-Marine and Environmental Sciences Centre, Departamento de Ciências da Terra, Universidade de Coimbra, 3030-790 Coimbra, Portugal;2. Department of Earth and Environmental Sciences, University of Milano-Bicocca, 20126 Milano, Italy;3. University College London, London WC1E 6BT, UK;4. Marine and Environmental Sciences Centre, University Katiavala Bwila, Angola;1. MARE – Marine and Environmental Sciences Centre, Department of Earth Sciences, University of Coimbra, 3030-790 Coimbra, Portugal;2. Laboratory for Provenance Studies, Department of Earth and Environmental Sciences, University of Milano-Bicocca, 20126 Milano, Italy;3. MARUM Center for Marine Environmental Sciences, University of Bremen, Bremen, Germany;4. University College London, London WC1E 6BT, UK;5. Geobiotec Research Centre, Department of Geosciences of University of Aveiro, 3810-193 Aveiro, Portugal |
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| Abstract: | Elevated methane (CH4) concentrations (128–2692×103 nM) occur in the hypersaline anoxic brine pools of Bannock and Urania Basins, eastern Mediterranean Sea, compared to low concentrations (17–80×103 nM) in the sediments below the anoxic brines. The CH4 enrichment in the brines might be due to the long residence time of the brine in the Basin. An attempt is made to determine the sources for the enriched dissolved CH4 by considering the influence of hydrothermal activity, the occurrence of sapropel layers (biogenic) and dissolution of gas hydrates. Furthermore, it is suggested that the enriched CH4 in Bannock and Urania Basins is diffused and mixed with the overlying waters by local upward transport mechanisms that selectively move CH4 upward in these Basins. |
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