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DOI:
地质力学学报:2011,17(2):175-184
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黄土高原东南部黄土记录的全新世东亚季风变化
许晨曦1,2, 郝青振1, 杨石岭1, 赵淑君1,2, 周鑫1,2, 葛俊逸2,3, 肖国桥2,3
(1.中国科学院地质与地球物理研究所, 中国科学院新生代地质与环境重点实验室, 北京 100029;2.中国科学院研究生院, 北京 100039;3.中国科学院地球环境研究所黄土 与第四纪地质国家重点实验室, 陕西 西安 710075)
EAST ASIAN MONSOON CHANGES DURING THE HOLOCENE ——RECORDS FROM THE SOUTHEASTERN LOESS PLATEAU
XU Chen-xi1,2, HAO Qing-zhen1, YANG Shi-ling1, ZHAO Shu-jun1,2, ZHOU Xin1,2, GE Jun-yi2,3, XIAO Guo-qiao2,3
(1.Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029;2.Graduate University of Chinese Academy of Sciences, Beijing 100039;3.State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710075)
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投稿时间:2010-02-08    
中文摘要: 在全球变暖背景下,未来东亚季风的变化一直备受关注,而东亚季风演化规律的研究能够为未来的预测提供重要基础。黄土-古土壤序列几乎连续地记录了古东亚季风变化的信息,本文选取黄土高原东南部的荥阳、偃师、灵宝、吉县、丁村五个剖面进行磁化率和古风化强度分析,重建了黄土高原东南部两万年以来的东亚夏季风演化历史:18~12 ka B.P., 季风强度较弱;12~10 ka B.P.,季风强度显著增强;10~6 ka B.P.,季风强度最强;6 ka B.P.以后季风强度逐渐减弱。对比发现黄土高原东南缘全新世东亚夏季风的演化与东亚季风区不同纬度代表性记录基本同步,没有显著的区域性差别;东亚夏季风变化主要受控于北半球低纬太阳辐射,但存在明显滞后。同时发现全新世古土壤磁化率与古风化强度峰值在地层中的位置往往不一致,在风化较强的地区,古风化强度最大值位置偏下,两个指标相比,古风化强度能够更客观地反映东亚夏季风强度。
中文关键词: 黄土  磁化率  风化强度  东亚夏季风
Abstract:The influence of global warming on East Asian Monsoon (EAM) has received intensive concern, and studies on history of EAM could provide important climate analogue in the warmer temperature context. Five loess-paleosol sequences in the southeastern Loess Plateau were sampled to address the history of EAM during the last 20 ka. The intensity of EAM was weak from 18 to 12 ka B.P., increased rapidly in the interval of 12-10 ka B.P, and reached highest points during 10-6 ka B.P., and declined after 6 ka B.P. The proxies of summer monsoon, magnetic susceptibility and paleo-weathering intensity in this study is basically timely consistent with the geological records in different part of EAM region. The insolation of low-latitude northern hemisphere is main control factor of EAM, although changes of EAM lagged variations of insolation of low-latitude northern hemisphere. The lag may be induced by several important boundary conditions (e.g., scales of polar ice sheet in northern high latitudes, sea level changes, interaction between sea and atmosphere in low latitudes) of EAM to insolation and interaction between components of climate system. Additionally, our studies showed that magnetic susceptibility (MS) and maximum FeD/FeT values in same section were not in same position of soil profiles, with lower position of maximum FeD/FeT value than that of MS in relatively strong weathering area. Compared with MS, FeD/FeT ratio can better reflect the intensity of EAM.
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基金项目:中国科学院知识创新工程重要方向项目 (编号:KZCX2-YW-Q1-03)资助.
引用文本:
许晨曦,郝青振,杨石岭,赵淑君,周鑫,葛俊逸,肖国桥.黄土高原东南部黄土记录的全新世东亚季风变化[J].地质力学学报,2011,17(2):175-184DOI:
XU Chen-xi,HAO Qing-zhen,YANG Shi-ling,ZHAO Shu-jun,ZHOU Xin,GE Jun-yi,XIAO Guo-qiao.EAST ASIAN MONSOON CHANGES DURING THE HOLOCENE ——RECORDS FROM THE SOUTHEASTERN LOESS PLATEAU[J].,2011,17(2):175-184DOI:

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