Holocene lake-level fluctuations of Selin Co on the central Tibetan plateau: Regulated by monsoonal precipitation or meltwater?
Holocene lake-level fluctuations of Selin Co on the central Tibetan plateau: Regulated by monsoonal precipitation or meltwater?
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青藏高原中部色林错全新世湖泊水位波动：受季风降水还是融水调节？
DOI：
10.1016/j.quascirev.2021.106919
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发表时间：
2021-06
影响因子：
4
通讯作者：
Gao Lei
中科院分区：
文献类型：
--
作者：
Hou Y;ong;Long Hao;Shen Ji;Gao Lei
在青藏高原上，湖泊作为古环境档案得到了最广泛的研究。研究了它们在不同时间尺度上对气候变化的敏感性。这些湖泊周围保存完好的海岸线和阶地遗迹提供了关键的地貌和沉积证据，可以用来推断过去湖泊在地质时间尺度上的水位。这些特征可以为理解未来的湖泊水位如何应对全球变暖提供一个类比。在这项研究中，我们用钾长石发光技术测定了28个样品的年代，研究了色林钴盆地周围一系列与水位有关的沉积剖面。结合所获得的年代学数据，结合沉积学、地层学证据和差分GPS测量观测，推断了色林地区全新世的湖平面波动历史。结果表明，湖面高度在10ka至7ka之间保持稳定，但随后湖泊水位显著下降。这种模式似乎跟随着太阳辐射迫使印度夏季风(ISM)强度的变化，特别是在全新世早期。然而，这种ISM强度在早期之后的逐渐减弱。全新世可能不能解释Selin Co的急剧萎缩，这意味着其他成分在很大程度上被低估了解释早期全新世湖泊有效水分的驱动因素。在这里，我们认为冰川和多年冻土增加的融水输入，加上降水的增加，可能导致了10e7ka的高湖平面，这是因为全新世早期的高温导致大量融化水流入湖泊。到7ka时，湖平面的突然下降可能与冰川地貌、冰芯和湖泊沉积物记录的区域温度下降导致的融水减少有关。因此，我们强调，冰川和永久冻土融化的水流入TP中部的湖泊，特别是在千年时间尺度上的暖期，也可能主导着全新世的高湖平面。
Over the Tibetan Plateau (TP), lakes as paleoenvironmental archives have been the most extensively.investigated for their sensitivities to climate change on different timescales. Well-preserved shoreline.and terrace remains surrounding these lakes provide critical geomorphological and sedimentary evidence that can be used to infer past lake levels over geological timescales. These features can offer an.analogue for understanding how future lake-levels respond to global warming. In this study, we.investigated a series of water level-related depositional profiles around the Selin Co basin from the.central TP, by dating 28 samples using K-feldspar luminescence techniques. Combining the obtained.chronological data with sedimentological, stratigraphic evidence and differential GPS survey observations, the Holocene history of lake-level fluctuations in Selin Co was inferred. The results show a stable.highstand between 10 ka and 7 ka but a striking subsequent lake-level decline. This pattern appears to.follow the solar insolation-forced changes in the intensity of the Indian summer monsoon (ISM),.particularly during the early Holocene. However, such gradual weakening of ISM intensity after the early.Holocene may not interpret the dramatically rapid shrinking of Selin Co, implying other components are.largely underrecognized driving factors accounting for the effective moisture of lakes in the early Holocene. Here, we argue that the increased meltwater input from glaciers and permafrost, together with.increased precipitation, might have resulted in the high lake level at 10e7 ka, as the high summer.temperature during the early Holocene induced massive melting water flow into the lake. By 7 ka, the.abrupt lake-level drop is likely related to the decreased meltwater owing to decreasing regional temperatures documented from glacier landforms, ice cores and lacustrine sediments. Therefore, we highlight that meltwater from glaciers and permafrost poured into lakes on the central TP, particularly during.warm periods on the millennial timescales, might also dominate the Holocene high lake levels.
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