Changes in Paleovegetation and Paleoclimate in China since the Late Middle Pleistocene: A Case Study of the Dajiuhu Basin
Changes in Paleovegetation and Paleoclimate in China since the Late Middle Pleistocene: A Case Study of the Dajiuhu Basin
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DOI：
10.3390/su13094848
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发表时间：
2021-04
期刊：
影响因子：
3.9
通讯作者：
Liwei Wu;Xinling Li;Qinghai Xu;Manyue Li;Qiufeng Zheng;Maoheng Zhang;Dandan Wang;Zhiguo He
中科院分区：
文献类型：
--
作者：
Liwei Wu;Xinling Li;Qinghai Xu;Manyue Li;Qiufeng Zheng;Maoheng Zhang;Dandan Wang;Zhiguo He
东亚季风系统是全球大气环流的重要组成部分，但不同地区的东亚季风记录表现出不同的演化节律。通过对神农架大九湖湖沉积物柱状样的高分辨率粒度和孢粉分析，重建了大九湖盆地中更新世晚期（约237.9ka至今）以来的古植被和古气候演化。结果表明，DJH-2孔的粒度和花粉记录与同一地区三宝洞石笋的δ 18 O记录一致，这与北方岁差（~20-kyr）尺度的日射变化密切相关。这与中国北方黄土高原记录的亚洲夏季风具有明显的百年变化周期不同。我们认为，中国南北方古气候记录的差异与中国中部秦岭的东西向山脉密切相关，这些山脉在冰期期间阻挡了减弱的东亚夏季风穿过山脉。
The East Asian monsoon system is an important part of global atmospheric circulation; however, records of the East Asian monsoon from different regions exhibit different evolutionary rhythms. Here, we show a high-resolution record of grain size and pollen data from a lacustrine sediment core of Dajiuhu Lake in Shennongjia, Hubei Province, China, in order to reconstruct the paleovegetation and paleoeclimate evolution of the Dajiuhu Basin since the late Middle Pleistocene (~237.9 ka to the present). The results show that grain size and pollen record of the core DJH-2 are consistent with the δ18O record of stalagmites from Sanbao Cave in the same area, which is closely related to the changes of insolation at the precessional (~20-kyr) scale in the Northern Hemisphere. This is different from the records of the Asian summer monsoon recorded in the Loess Plateau of North China, which exhibited dominant 100-kyr change cyclicities. We suggest that the difference between paleoclimatic records from North and South China is closely related to the east–westoriented mountain ranges of the Qinling Mountains in central China that blocked weakened East Asia summer monsoons across the mountains during glacial periods.