地质力学学报2011，Vol.17Issue(2)：175-184,10.
黄土高原东南部黄土记录的全新世东亚季风变化
EAST ASIAN MONSOON CHANGES DURING THE HOLOCENE——RECORDS FROM THE SOUTHEASTERN LOESS PLATEAU
摘要
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.关键词
黄土/磁化率/风化强度/东亚夏季风Key words
loess/magnetic susceptibility/paleo-weathering intensity/East Asian summer monsoon分类
天文与地球科学引用本文复制引用
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):175-184,10.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. （编号:KZCX2-YW-Q1-03）
