East Asian monsoon variation during the last 130,000 Years: evidence from the Loess Plateau of central China and Lake Biwa of Japan
East Asian monsoon variation during the last 130,000 Years: evidence from the Loess Plateau of central China and Lake Biwa of Japan
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DOI：
10.1016/s0277-3791(97)00097-8
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发表时间：
1999
影响因子：
4
通讯作者：
Jule Xiao;Z. An;Tung-sheng Liu;Y. Inouchi;H. Kumai;Shusaku Yoshikawa;Yoichi Kondo
中科院分区：
文献类型：
--
作者：
Jule Xiao;Z. An;Tung-sheng Liu;Y. Inouchi;H. Kumai;Shusaku Yoshikawa;Yoichi Kondo
黄土高原黄土-古土壤序列是2.5Ma以来亚洲季风气候变化的良好代用记录。黄土和古土壤的磁化率已被用作夏季风强度的代理指标，而从黄土和古土壤中分离出的石英的中值直径已被视为冬季风的强度的代理指标，负责大部分的灰尘输送。近13万年来日本中部琵琶湖的风成石英通量提供了东亚冬季风变化的直接信息，而河流石英通量则反映了该湖区古降水的显著变化。氧同位素5d和5 b亚期、4和2亚期风成石英通量值高的时段对应于中国黄土和古土壤石英中值粒径大的时段，表明冬季风增强;而在同位素子阶段5e，5c，和5a，阶段3和阶段1与中国黄土和古土壤的高磁化率值时期相对应，表明夏季风强度增强。风成石英通量和石英中位直径代表的冬季风强度变化与河流石英通量和磁化率代表的夏季风强度变化一般呈反比关系。
The loess–paleosol sequence on the Loess Plateau of central China constitutes an excellent proxy record of variations in Asian monsoon climate over the past 2.5Ma. Magnetic susceptibility of loess and paleosols has been used as a proxy indicator for summer monsoon intensity, while the median diameter of quartz isolated from the loess and paleosols has been regarded as a proxy index of the strength of winter monsoon winds that were responsible for most of the dust transport. The eolian quartz flux to Lake Biwa of central Japan during the last 130,000yr provides direct information on variations of the East Asian winter monsoon; whereas the fluvial quartz flux reflects significant changes in paleoprecipitation over the lake area. The intervals of high eolian quartz flux values during marine oxygen isotope substages 5d and 5b, and stages 4 and 2 correspond to the periods of large quartz median diameter values of the Chinese loess and paleosols, indicating strengthened winter monsoon winds; whereas the intervals of high fluvial quartz flux values during isotope substages 5e, 5c, and 5a, and stages 3 and 1 correlate to the periods of high magnetic susceptibility values of the Chinese loess and paleosols, suggesting increased summer monsoon intensity. Variations in winter monsoon strength indicated by the eolian quartz flux and quartz median diameter proxies bear a general inverse relation to those in summer monsoon intensity inferred from the fluvial quartz flux and magnetic susceptibility proxies.