Response of chironomid assemblages to East Asian summer monsoon precipitation variability in northern China since the last deglaciation

Response of chironomid assemblages to East Asian summer monsoon precipitation variability in northern China since the last deglaciation
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末次冰消期以来中国北方摇蚊组合对东亚夏季风降水变化的响应

DOI:
10.1002/jqs.2921
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发表时间:
2016-11
影响因子:
2.3
通讯作者:
Fahu Chen
Fahu Chen
中科院分区:
地球科学3区
文献类型:
--
作者:
Zongli Wang;Jianbao Liu;Qinghai Xu;Fahu Chen

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通过对位于中国北方东亚夏季风(EASM)边界的公海湖沉积物柱样中摇蚊的研究,定量分析了13.5 ka BP以来EASM的变化。六个显著不同的摇蚊组合带表明,最大的降水和水深发生在全新世中期(8270-2700 cal a BP),最小的时期是过去的1250年。以贡海附近44个湖泊为研究对象,研究了摇蚊群落对降水的响应。我们的研究结果表明,平均年降水量是最重要的环境变量影响现代摇蚊组合在这个季风区。季风边缘摇蚊化石组合表明的中全新世东亚夏季风最大降水量与中国南方石笋δ 18 O数据表明的全新世早期东亚夏季风最大降水量形成对比,但与其他证据一致。我们的研究结果与中国南方石笋δ 18 O变化不能可靠地反映末次冰消期以来东亚夏季风演化的观点相一致。
We investigate chironomid assemblages in a sediment core from Gonghai Lake, which is located on the East Asian summer monsoon (EASM) boundary in northern China, to quantify EASM variability during the past 13.5 ka BP. Six significantly different chironomid assemblage zones indicate that maximum precipitation and water depth occurred in the mid‐Holocene (8270–2700 cal a BP) and the minimum period was the past 1250 years. A modern dataset of 44 lakes near Gonghai Lake was sampled to calibrate the response of chironomid assemblages to precipitation. Our results demonstrate that mean annual precipitation is the most significant environmental variable influencing modern chironomid assemblages in this monsoonal region. Maximum EASM precipitation in the mid‐Holocene, indicated by chironomid assemblages in the monsoon fringe, contrasts with the early Holocene EASM maximum suggested by stalagmite δ18O data from southern China, but is consistent with other evidence. Our findings are compatible with the proposal that the stalagmite δ18O variations in southern China may not reliably reflect the evolution of EASM since the last deglaciation.
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