Climatic and environmental changes since 2 kaBP by End Member Modeling analysis on grain size data from a peat core of Yuhua Mountain, Jiangxi Province

SHANG Guangchun; LI Liang; MA Chunmei; YI Shuangwen; ZHAO Lin; CUI Anning

doi:10.16562/j.cnki.0256-1492.2019011501

Marine Geology & Quaternary Geology > 2020 > 40(2): 165-173. > DOI: 10.16562/j.cnki.0256-1492.2019011501

SHANG Guangchun, LI Liang, MA Chunmei, YI Shuangwen, ZHAO Lin, CUI Anning. Climatic and environmental changes since 2 kaBP by End Member Modeling analysis on grain size data from a peat core of Yuhua Mountain, Jiangxi Province[J]. Marine Geology & Quaternary Geology, 2020, 40(2): 165-173. DOI: 10.16562/j.cnki.0256-1492.2019011501

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Climatic and environmental changes since 2 kaBP by End Member Modeling analysis on grain size data from a peat core of Yuhua Mountain, Jiangxi Province

1.
School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210023, China
2.
Jiangsu Collaborative Innovation Center for Climate Change, Nanjing 210023, China

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Received Date: January 14, 2019
Revised Date: April 04, 2019
Available Online: April 14, 2020

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Abstract

Abstract

Based on the AMS¹⁴C dating of a peat core from Mt Yuhua in Jiangxi Province, China, we explore how grain size varies in response to climate changes. We then reconstruct climate change since 2 000 aBP through grain size analysis, grade-standard deviation method, and end-member model. Our results show that the sediments in the peatland of Mt Yuhua are mainly consisting of fine sand (4～16 μm) and coarse silt (16～64 μm). Three end-members EM1, EM2, and EM3 represent, respectively, fine components transported by hydrodynamics, soil-forming components, and components that reflect abrupt climate changes. Grade-standard deviation indicates a range of sensitive components between 10.473 and 16.535 μm. Our reconstruction shows, first and foremost, an increase in precipitation between AD 1−300, Which was fellowed by a generally dry condition in AD 300−500 and a wet condition in AD 500−650, the latter period probably witnessed fewer climate fluctuations and floods. Despite an overall dry condition, climate fluctuated greatly in AD 650−900, and, while AD 900−1400 was relatively humid, the climate was not stable for a brief duration of 100 years. The Little Ice Age (LIA), spanning over 500 hundred years from AD 1400 to 1800, can be roughly divided into three stages, each governed by a wet, dry, and wet condition. The palaoclimatic reconstruction in this study is proved to be reliable when compared with δ¹⁸O data collected from Dongge cave and the humidity index of Jiangnan region.
- peat,
- grain size,
- grade-standard deviation method,
- end member modeling,
- climate change

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