Globally synchronous climate change 2800 years ago: Proxy data from peat in South America |
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| Institution: | 1. Centre for Environmental Change and Quaternary Research, Department of Natural and Social Sciences, University of Gloucestershire, Cheltenham GL50 4AZ, UK;2. Department of Geography and Environment, University of Aberdeen, Elphinstone Road, Aberdeen AB24 3UF, UK;3. Centro de Investigación en Matemáticas, A.P. 402, Guanajuato, Gto., C.P. 36000, Mexico;1. Department of Geosciences, University of Massachusetts, Amherst, MA 01002, USA;2. Institute of Global Environmental Change, Xi''an Jiaotong University, Xi''an 710049, China;3. Department of Geology and Geophysics, University of Minnesota, Minneapolis, MN 55455, USA;4. Department of Atmospheric and Environmental Sciences, University at Albany, State University of New York, Albany, NY 12222, USA;1. School of Environmental and Life Science, The University of Newcastle, Callaghan, NSW 2308, Australia;2. Department of Resource Management and Geography, The University of Melbourne, Parkville, VIC 3010, Australia;3. School of Earth Sciences, The University of Melbourne, Parkville, VIC 3010, Australia;4. The University of Queensland, Brisbane, QLD 4072, Australia;5. Institute of Geology and Paleontology, The University of Innsbruck, 6020 Innsbruck, Austria;1. College of Resources and Environmental Sciences, Hunan Normal University, Changsha, 410081, China;2. Guangdong Province Key Laboratory for Coastal Ocean Variation and Disaster Prediction, College of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang, 524088, China;3. Key Laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China;4. Key Laboratory of Western China''s Environmental Systems, Ministry of Education, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, 730000, China;5. Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China;1. Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, 818 Beijing South Road, Urumqi 830011, China;2. University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing 100049, China;3. College of Environment and Planning, Henan University, Jinming Street, Kaifeng, Henan 475004, China;4. School of Environmental and Chemical Engineering, Chongqing Three Gorges University, Shalong Road, Chongqing 404000, China;1. GFZ German Research Centre for Geosciences, Section 5.2 – Climate Dynamics and Landscape Evolution, Telegrafenberg, 14473 Potsdam, Germany;2. GFZ German Research Centre for Geosciences, Section 5.4 – Hydrology, Telegrafenberg, 14473 Potsdam, Germany;3. University of Potsdam, Institute of Earth and Environmental Sciences, 14476 Potsdam, Germany |
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| Abstract: | Initial findings from high-latitude ice-cores implied a relatively unvarying Holocene climate, in contrast to the major climate swings in the preceding late-Pleistocene. However, several climate archives from low latitudes imply a less than equable Holocene climate, as do recent studies on peat bogs in mainland north-west Europe, which indicate an abrupt climate cooling 2800 years ago, with parallels claimed in a range of climate archives elsewhere. A hypothesis that this claimed climate shift was global, and caused by reduced solar activity, has recently been disputed. Until now, no directly comparable data were available from the southern hemisphere to help resolve the dispute. Building on investigations of the vegetation history of an extensive mire in the Valle de Andorra, Tierra del Fuego, we took a further peat core from the bog to generate a high-resolution climate history through the use of determination of peat humification and quantitative leaf-count plant macrofossil analysis. Here, we present the new proxy-climate data from the bog in South America. The data are directly comparable with those in Europe, as they were produced using identical laboratory methods. They show that there was a major climate perturbation at the same time as in northwest European bogs. Its timing, nature and apparent global synchronicity lend support to the notion of solar forcing of past climate change, amplified by oceanic circulation. This finding of a similar response simultaneously in both hemispheres may help validate and improve global climate models. That reduced solar activity might cause a global climatic change suggests that attention be paid also to consideration of any global climate response to increases in solar activity. This has implications for interpreting the relative contribution of climate drivers of recent ‘global warming’. |
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