Atmospheric methane,southern European vegetation and low-mid latitude links on orbital and millennial timescales |
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| Authors: | P.C. Tzedakis H. Pälike K.H. Roucoux L. de Abreu |
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| Affiliation: | 1. Earth and Biosphere Institute, School of Geography, University of Leeds, Leeds, LS2 9JT, UK;2. Department of Environment, University of the Aegean, 81100 Mytilene, Greece;3. School of Ocean and Earth Science, National Oceanography Centre, Southampton, University of Southampton, Southampton SO14 3ZH, UK;4. LNEG, Departamento de Geologia Marinha, Estrada da Portela, Zambujal, 2721-866, Alfragide, Portugal;1. Utrecht University, Faculty of Geosciences, Department of Earth Sciences, Budapestlaan 4, 3584 CD, Utrecht, Netherlands;2. Royal Netherlands Meteorological Institute, Postbus 201, 3730 AE, De Bilt, Netherlands;3. The Australian National University, Research School of Earth Sciences, Canberra, ACT 2601, Australia;1. Centre for Quaternary Research, Royal Holloway, University of London, Egham Hill, Surrey, TW20 0EX, UK;2. Department of Geography, College of Science, Swansea University, Singleton Park, Swansea, SA2 8PP, Wales, UK;3. GFZ German Research Centre for Geosciences, Telegrafenberg, Building C, 14473, Potsdam, Germany;4. Department of Geography, University of Portsmouth, Buckingham Building, Lion Terrace, Portsmouth, PO1 3HE, UK;5. Geography, University of Manchester, Arthur Lewis Building, Oxford Road, Manchester, M13 9PL, UK;6. School of Geography, Archaeology and Palaeoecology, Queen''s University, Belfast, BT7 1 NN, Northern Ireland, UK;7. Centre for Ice and Climate, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, 2100, Copenhagen, Denmark;8. Dipartimento di Scienze della Terra, University of Pisa, Pisa, Italy;1. Institut des Sciences de la Terre d''Orléans (ISTO), INSU-CNRS, Université d''Orléans, 1A rue de la Férolerie, 45071 Orléans Cedex 2, France;2. Dip. Scienze della Terra e del Mare (DiSTeM), Università di Palermo, Via Archirafi 22, 90123 Palermo, Italy;3. Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione di Palermo, Via U. La Malfa 153, 90146 Palermo, Italy;1. Divisão de Geologia e Georecursos Marinhos, Instituto Português do Mar e da Atmosfera, Rua Alfredo Magalhães Ramalho, 6, 1495-006 Lisboa, Portugal;2. Centro de Ciências do Mar (CCMAR), Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal;3. Godwin Laboratory for Palaeoclimate Research, Department of Earth Sciences, University of Cambridge, UK;4. Institute of Environmental Assessment and Water Research (IDAEA), CSIC, Jordi Girona, 18, 08034, Barcelona, Spain;5. IFREMER - Centre Atlantique (French Research Institute for Exploitation of the Sea), Département EMH (Ecologie et Modèles pour l''Halieutique), Rue de l''Ile d''Yeu, BP 21105 44311 Nantes Cedex 3, France |
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| Abstract: | Pollen records from marine and terrestrial sequences in southern Europe reveal a strong coherence between changes in tree populations and atmospheric methane concentrations over the last 800 thousand years. Variations in the continental hydrological balance provide a link for the observed patterns, leading to concomitant changes in southern European vegetation, and low-latitude wetland extent and methane/volatile organic compound emissions, although additional contributions to the methane budget from extratropical sources are not excluded. Here we propose that the close coupling between low- and mid-latitude hydrological changes reflects shifts in the mean latitudinal position of the Intertropical Convergence Zone, which determines the extent to which southern Europe is dominated by subtropical or mid/high-latitude influences. This provides a conceptual framework within which to view vegetation variability in southern Europe on orbital and millennial timescales. |
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