Evidence of Abrupt Climate Change during the Mid-to Late-Holocene Recorded in a Tropical Lake, Southern China  

作　　者：LING Yuan TANG Wenkun WANG Yong TIAN Fei YUAN Lupeng YE Mengni 

机构地区：[1]Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China

出　　处：《Acta Geologica Sinica(English Edition)》2020年第4期1187-1193,共7页地质学报（英文版）

基　　金：co-supported by the Geological Survey Project of China(Grant No.DD20190370);the Basic Scientific Research Fund of Institute of Geology,Chinese Academy of Geological Sciences(Grant No.J2018)。

摘　　要：Research on abrupt paleoclimatic and paleoenvironmental change provides a scientific basis for evaluating future climate. Because of spatial variability in monsoonal rainfall, our knowledge about climate change during the mid-to lateHolocene in southern China is still limited. We present a multi-proxy record of paleoclimatic change in a crater lake, Lake Shuangchi. Based on the age-depth model from 210 Pb, 137 Cs and AMS14 C data, high-resolution mid-to late-Holocene climatic and environmental records were reconstructed using multiple indices(TOC, TN, C/N, δ13 C and grain size). Shuangchi underwent a marked change from a peat bog to a lake around 1.4 kaBP. The C3 plants likely dominated during 7.0–5.9 ka and 2.5–1.4 kaBP, while C4 plants dominated between 5.9–3.2 and 3.0–2.5 kaBP. Algae were dominant sources of organic matter in the lake sediments after 1.4 kaBP. Several intervals with high concentrations of coarser grain sizes might be due to flood events. These results reveal that several abrupt paleoclimatic events occurred around 6.6 ka, 6.1 ka, 5.9 ka, 3.0 ka, 2.5 ka and 1.4 kaBP. The paleoclimatic change recorded in the lake may be related to the migration of the Intertropical Convergence Zone(ITCZ) and El Ni?o-Southern Oscillation(ENSO) activity.

关 键 词：paleoclimatic events ITCZ ENSO HOLOCENE Shuangchi Lake 

分 类 号：P532[天文地球—古生物学与地层学]