Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1040264 | Quaternary International | 2016 | 9 Pages |
Abstract
We present a high resolution environmental magnetic record of the East Asian summer monsoon spanning paleosol S1, corresponding to Marine Oxygen Isotope (MIS) 5, from the Jiuzhoutai (JZT) loess section in Lanzhou, on the northwestern edge of the Chinese Loess Plateau. We use a chronology based on a sediment grain-size age model frequently used for Chinese loess. The Eemian is dated to 127.37 - 121.31Â ka BP and can be divided into three sub-stages based on variations in summer monsoon intensity: early Eemian (127.37 - 125.67Â ka BP) with an intermediate summer monsoon intensity; mid Eemian (125.67 - 124.24Â ka BP) with weakest summer monsoon intensity, and late Eemian (124.24 - 121.31Â ka BP) with the strongest summer monsoon intensity. Contrasting, the winter monsoon weakened at the beginning of MIS5e, reached its weakest intensity during the late Eemian (â¼121Â ka BP), and then commenced an irreversible strengthening trend. Furthermore, the Eemian exhibits a similar climatic trend to the Holocene optimum, since both are divided into two parts by an intervening arid interval and the most humid period occurs in the secondary pedogenic stage. Therefore we suggest that the climate evolution during Eemian and later may provide useful information about climate forecast in the future.
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Geology
Authors
Jia Jia, Dunsheng Xia, Youjun Wang, Bo Wang, Hao Lu, Shuang Zhao,