Holocene evolution of the Indian Summer Monsoon inferred from a lacustrine record of Lake Wuxu, south-east Tibetan Plateau
Holocene evolution of the Indian Summer Monsoon inferred from a lacustrine record of Lake Wuxu, south-east Tibetan Plateau
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从青藏高原东南部戊圩湖湖泊记录推断印度夏季风的全新世演化
DOI：
10.1002/jqs.3113
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发表时间：
2019
影响因子：
2.3
通讯作者：
Ning Dongliang
中科院分区：
文献类型：
--
作者：
Wang Yongbo;Zhang Enlou;Sun Weiwei;Chang Jie;Liu Xingqi;Ni Zhenyu;Ning Dongliang
本文对青藏高原东南部吴圩湖12.3calkabp以来的连续沉积记录进行了研究，以探讨全新世印度夏季风的演变。利用C/N摩尔比和碳稳定同位素分析了有机质的来源和气候条件。将吴圩湖的演变分为两个时期。在第一个时期（全新世早期至中期），湖泊接收了更多的河流输送物质，反映了夏季风与太阳辐射的变化。湖平面下降，水停留时间增加，因为减少河流排放量在第二个时期（晚全新世）对应的夏季风减弱。有机物质揭示了湖泊初级生产力的主要贡献，这与东阁洞的高分辨率同位素记录以及总太阳辐照度显示出相同的模式。我们在吴圩湖的观测记录表明，全新世印度夏季风的演变是由太阳强迫在十年/百年到千年的时间尺度上驱动的。此外，季风在4.0 cal kabp附近突然下降，这可能是由厄尔尼诺-南方涛动事件频率增加引起的。版权所有© 2019 John Wiley & Sons，Ltd
A continuous sediment record since 12.3 cal kabpfrom Lake Wuxu (south‐eastern Tibetan Plateau) was investigated in terms of the Holocene evolution of the Indian Summer Monsoon. The molar C/N ratio and stable C isotope were used to identify the source of the organic matter as well as climate conditions. The evolution of Lake Wuxu was summarized wihtin two periods. During the first period (early to mid‐Holocene), the lake received increased fluvially transported materials, reflecting variation in the summer monsoon with solar insolation. The lake level declined and water residence time increased because of reduced river discharge during the second period (late Holocene) corresponding to a weakening of the summer monsoon. The organic material revealed a major contribution from lake primary productivity, which showed identical patterns with a high‐resolution isotope record from Dongge Cave, as well as total solar irradiance. Our record from Lake Wuxu indicates that the Holocene evolution of the Indian Summer Monsoon has been driven by the solar forcing at decadal/centennial to millennial time scales. Furthermore, an abrupt decline in the monsoon was detected at around 4.0 cal kabp, which is probably caused by an increased frequency of EI Nino‐Southern Oscillation events. Copyright © 2019 John Wiley & Sons, Ltd.