Younger Dryas to early Holocene (12.9 to 8.1 ka) limnological and hydrological change at Barley Lake, California (northern California Coast Range)

Younger Dryas to early Holocene (12.9 to 8.1 ka) limnological and hydrological change at Barley Lake, California (northern California Coast Range)
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新仙女木期到全新世早期(12.9 至 8.1 ka)加州巴利湖(北加州海岸山脉)的湖泊学和水文变化

DOI:
10.1017/qua.2021.9
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发表时间:
2021
影响因子:
2.3
通讯作者:
Ramezan, Reza
Ramezan, Reza
中科院分区:
地球科学3区
文献类型:
--
作者:
Leidelmeijer, Jenifer A.;Kirby, Matthew E.C.;MacDonald, Glen;Carlin, Joseph A.;Avila, Judith;Han, Jiwoo;Nauman, Benjamin;Loyd, Sean;Nichols, Kevin;Ramezan, Reza

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古气候视角为理解未来气候提供了重要信息,特别是在像加利福尼亚这样的干旱地区,那里的水供应每年都不确定。本文介绍了加利福尼亚大麦湖的记录,重点研究了新仙女木期(YD)到全新世早期(EH)的间隔,这是一个全球气候急剧变化的时期。12个放射性碳测年将时间限制在12.9至8.1 ka之间。我们结合各种沉积物分析来推断湖泊生产力、相对湖泊水位和径流动态的变化。总体而言,该湖具有两种状态(间隔时间小于200年)的特征:(1)一个变深、低生产力的YD湖;(2)由两部分组成的变浅高生产力EH湖。推断的EH冬季降水径流揭示了动态的几十年到百年尺度的变化,与EH湖平面数据一致。大麦湖的档案记录了整个过渡时期的半球和区域气候变化信号,表明海洋-大气和日照强迫都有作用。我们的古视角强调加州对气候变化的敏感性,以及这种变化如何在湖泊系统中产生突变。
Paleoperspectives of climate provide important information for understanding future climate, particularly in arid regions such as California, where water availability is uncertain from year to year. Here, we present a record from Barley Lake, California, focusing on the interval spanning the Younger Dryas (YD) to the early Holocene (EH), a period of acute and rapid global climate change. Twelve radiocarbon dates constrain the timing between 12.9 and 8.1 ka. We combine a variety of sediment analyses to infer changes in lake productivity, relative lake level, and runoff dynamics. In general, the lake is characterized by two states separated by a <200-year transition: (1) a variably deep, lower-productivity YD lake; and (2) a two-part variably shallow, higher-productivity EH lake. Inferred EH winter-precipitation runoff reveals dynamic multidecadal-to-centennial-scale variability, in agreement with the EH lake-level data. The Barley Lake archive captures both hemispheric and regional signals of climate change across the transition, suggesting a role for both ocean-atmosphere and insolation forcing. Our paleoperspective emphasizes California's sensitivity to climate change and how that change can generate abrupt shifts in limnological regimes.
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