末次盛冰期华北平原古气候古环境演化

Climatic and Environmental Change in North China Plain during the Last Glacial Maximum

华北平原宁晋泊南王庄剖面的14C和光释光年代测定表明宁晋泊地区在末次盛冰期有连续的湖相沉积。依据孢粉、碳酸盐、有机碳含量(TOC)及C/N值的高分辨率分析与综合判识,末次盛冰期并不是一个持续的干冷时期,而是存在从凉湿-冷偏湿-冷干的波动变化过程。其中早期明显降温事件,可以与Heinrich事件2(H2)对比,说明全球降温的同步性。本研究说明末次盛冰期(20-16 ka BP),在全球气候变冷的背景下,存在一个冬季风不断加强夏季风逐渐变弱的过程。

Based on the carbon-14 and TL dating of the Longrao--Nanwang profile in the North China Plain, a continuous lake sediment is attributed to the Last Glacial Maximum （LGM） （20-16 ka BP） in Ningjin Lake. Our pollen and geochemical data indicate that the LGM was not a single cold and dry condition, but an oscillatory process from cool-humid through cold-humid to cold-dry climate. The Ningjin lacustrine record further shows a simultaneous global cold event. In combination with previous records we suggest that, under a global cold background during the LGM, winter monsoons became stronger while summer monsoons became weaker.