Holocene monsoon climate documented by oxygen and carbon isotopes from lake sediments and peat bogs in China: a review and synthesis |
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| Authors: | Jiawu Zhang Fahu Chen Jonathan A Holmes Hui Li Xiaoyan Guo Junlan Wang Shuang Li Yanbin Lü Yan Zhao Mingrui Qiang |
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| Institution: | 1. College of Mining Technology, Taiyuan University of Technology, Taiyuan 030024, China;2. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China;3. College of Resources, Environment and Tourism, Capital Normal University, Beijing 100048, China;4. Department of Ocean Science and Engineering, South University of Science and Technology, Shenzhen 518055, China;5. Department of Earth and Environmental Sciences, University of Windsor, Windsor, ON N9B 3P4, Canada;6. Department of Chemistry & Biochemistry, University of Windsor, Windsor, ON N9B 3P4, Canada;7. State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Beijing 100083, China;8. College of Earth and Environmental Sciences, MOE Key Laboratory of Western China''s Environmental Systems, Lanzhou University, Lanzhou 730000, China;9. Laboratory for Marine Geology, Qingdao National Oceanography Laboratory for Science and Technology, Qingdao 266237, China;1. Key Laboratory of West China''s Environmental System (Ministry of Education), Lanzhou University, Lanzhou 730000, China;2. Institute of Nihewan Archaeology Research, College of Resources and Environment, Hebei Normal University, Shijiazhuang 050024, China |
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| Abstract: | There has been much recent debate about Holocene climate variation in the monsoon region of China, especially the temporal pattern of variations in precipitation, the time-transgressive nature of the Holocene precipitation maximum, and the extent to which variations in regions influenced by the Indian Summer Monsoon (ISM) and the East Asian Summer Monsoon (EASM) have been synchronous. We summarize and compare carbonate oxygen-isotope records (δ18Ocarb) from ten lakes within the present-day ISM region. We discuss their paleoclimate significance considering the present-day moisture source, isotopic composition of precipitation and the hydrological setting. The δ18Ocarb records are controlled mainly by the isotopic composition of lake water, which in turn is a function of regional Precipitation/Evaporation (P/E) balance and the proportion of precipitation that is monsoon-derived. We normalized the δ18Ocarb data and used these records to generate an integrated moisture index. This index, along with oxygen-isotope records from speleothems and carbon-isotope records (δ13Corg) from peats within the monsoon region, suggests that Holocene climate was broadly synchronous across the monsoon region and, within the limits of accuracy of the existing age models, provides no strong evidence for previously-proposed anti-phasing of the ISM and the EASM. Stable-isotope records from lake sediments and peat bogs have excellent potential for providing high-quality paleoclimate data for monsoon Asia, and complement high-resolution speleothem sequences, which are only found in certain localities. |
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