Synchronous climate anomalies in the western North Pacific and North Atlantic regions during the last 14,000 years |
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| Authors: | YT Hong B Hong QH Lin Y Shibata YX Zhu XT Leng Y Wang |
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| Institution: | 1. State Key Laboratory of Environmental Geochemistry, The Institute of Geochemistry, Chinese Academy of Sciences, 73 Guanshui Road, Guiyang, Guizhou 550002, China;2. Environmental Chemistry Division, National Institute for Environmental Studies, Onogawa 16-2, Tsukuba, Ibaraki 305-0053, Japan;3. Institute of Peatmire, Northeast Normal University, Changchun, Jilin 130024, 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. Senckenberg Research Station of Quaternary Palaeontology Weimar, Am Jakobskirchhof 4, 99423 Weimar, Germany;2. Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Telegrafenberg A43, 14473 Potsdam, Germany;3. Lower Saxony Institute for Historical Coastal Research, Viktoriastr. 26/28, 26382 Wilhelmshaven, Germany;4. Institute of Geological Sciences, Palaeontology Section, Free University Berlin, Malteserstr. 74–100, Haus D, 12249 Berlin, Germany;5. Institute of Geology and Geophysics Chinese Academy of Sciences, No. 19 Beitucheng West Road, Chaoyang District, Beijing 100029, China;6. GFZ German Research Centre for Geosciences, Section 5.2 – Climate Dynamics and Landscape Evolution, Telegrafenberg C109, 14473 Potsdam, Germany;1. Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;2. College of Earth Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;3. Paleo Labo Co., Ltd., Saitama 335-0016, Japan;1. Institute of Polar Environment, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, China;2. The Second Hydrogeology and Engineering Geology Prospecting Institute of Heilongjiang Province, Haerbin, 150030, China;3. Key Laboratory of Vertebrate Evolution and Human Origins of Chinese Academy of Sciences, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing 100044, China;4. Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;5. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China;6. Nansen-Zhu International Research Centre, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China;7. Paleoecological Environmental Assessment and Research Lab (PEARL), Department of Biology, Queen''s University, Kingston, Ontario, K7L 3N6, Canada |
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| Abstract: | A peat cellulose δ18O record spanning around 14,000 years from the Hani peat mire in northeastern China reveals several abrupt temperature anomalies in the period from the last deglaciation through the Holocene. The timing of these anomalies coincides well with the notable cooling events recorded respectively using the GISP2 ice core and ice-rafted sediment of the North Atlantic Ocean, such as the Older Dryas, Inter-Allerød, Younger Dryas, and the nine ice-rafted debris events. The results demonstrate that this repeating pattern of abrupt temperature deterioration is not limited to the North Atlantic area at high latitude but also exists in the western North Pacific region at middle latitude. The synchronous temperature anomalies possibly are resulted from the joint effects of meltwater discharge into the North Atlantic Ocean and reduced solar activity. In the period from around 8600 to 8200 cal. yrs BP the Hani peat record shows a broad δ18O peak that may reflect compound climate signals resulting from the two kinds of forcing factors: the temperature drop related to reduced solar activity at around 8600–8250 cal. yrs BP, and the temperature anomaly attributed to the meltwater effect at around 8220 ± 70 cal. yrs BP. This result may provide palaeo-temperature evidence for existence of the sharp “8.2 k” event in the western North Pacific region. In addition, our results have revealed that in the period from the last deglaciation through the Holocene the synchronous temperature anomalies before and after the “8.2 k” event seem to be related to meltwater outflow and reduced solar activity, respectively. It is important that the all temperature anomalies—whether because of reduced solar activity in the late Holocene or from meltwater discharge in the early Holocene—are accompanied by an abrupt decline in the Indian Ocean summer monsoon and abrupt strengthening of the East Asian summer monsoon. It is likely that reduced solar activity and meltwater outflow appear to modulate Earth system changes in the same direction. The influences could be compounded. Reduced solar activity and meltwater outburst both appear to act as triggers for occurrence of the El Niño phenomenon in the equatorial Pacific Ocean, which may result in broad teleconnections between the temperature anomaly in the Northern Hemisphere and abrupt variation of the Asian monsoon. |
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