中亚则克台黄土剖面记录的末次冰期以来的环境演变

选取位于中亚伊犁盆地中东部的则克台（ZKT）黄土剖面作为研究对象，基于13 个光释 光年代构建了ZKT 剖面的年代框架，利用黄土沉积速率、粒度以及总有机碳含量重建了伊犁地区 末次冰期以来的环境演变记录。结果表明：（1）伊犁地区末次冰期以来的气候演化阶段可划分为 寒冷期（74.5~60 ka）、温湿期（60~30 ka）、寒冷期（30~11.5 ka）以及11.5 ka 以来的暖湿期， 该气候演化特征与深海氧同位素不同阶段气候特征较为一致；（2）MIS4 至MIS1 阶段则克台剖 面沉积速率呈递减趋势，分别为49 cm·ka^-1、32 cm·ka^-1、13 cm·ka^-1 和8 cm·ka^-1；（3）ZKT 剖面 代表的伊利地区环境演变特征可与格陵兰冰芯进行良好对比，北大西洋地区的快速气候波动信号 在伊犁地区气候记录相对清晰，在时间上呈同步变化。

The environmental change records since the Last Glaciation at Zeketai loess section, central Asia

Based on 13 OSL (optical stimulated luminescence) dating results, accumulation rate, grain size and TOC (total organic content) in Zeketai loess section in central Asia, an environmental evolution record during the Last Glacial Period was reconstructed. The results indicate that: (1) the climatic change in Ili basin during the last glacial period can be divided into 4 stages, i.e. cold stage (74.5~60 ka), mild moist stage (60~30 ka), cold stage (30~11.5 ka) and warm wet stage (11.5 ka~), and the climatic changing characteristics are consistent with marine oxygen isotope records; (2) since the beginning of Last Glacial Period, the loess accumulation rates presented a decreasing trend and are 49 cm·ka^-1 in MIS4 stage, 32 cm·ka^-1 in MIS3 stage, 13 cm·ka^-1 in MIS2 stage and 8 cm·ka^-1, respectively; (3) comparing between ZKT loess environmental records and the oxygen isotope records in GRIP ice core, we found that the signals of rapid climatic fluctuation from north Atlantic region are clearly recorded in ZKT loess records synchronously.