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Younger Dryas to early Holocene (12.9 to 8.1 ka) limnological and hydrological change at Barley Lake, California (northern California Coast Range)
Quaternary Research ( IF 2.3 ) Pub Date : 2021-04-01 , DOI: 10.1017/qua.2021.9
Jenifer A. Leidelmeijer , Matthew E.C. Kirby , Glen MacDonald , Joseph A. Carlin , Judith Avila , Jiwoo Han , Benjamin Nauman , Sean Loyd , Kevin Nichols , Reza Ramezan

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.

中文翻译:

加利福尼亚州大麦湖(加利福尼亚北部海岸山脉)的年轻仙女木到全新世早期(12.9 至 8.1 ka)的湖泊和水文变化

古气候观点为了解未来气候提供了重要信息,特别是在加利福尼亚等干旱地区,那里的水资源可用性每年都不确定。在这里,我们展示了加利福尼亚州大麦湖的记录,重点关注从新世仙女木 (YD) 到全新世早期 (EH) 的时间间隔,这是全球气候变化剧烈而迅速的时期。十二个放射性碳日期将时间限制在 12.9 和 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。一般来说,该湖的特点是两个状态相隔 <200 年的过渡:(1)深度不一、生产力较低的 YD 湖;(2) 一个由两部分组成的变浅、高产的 EH 湖。推断的 EH 冬季降水径流揭示了动态的多年代到百年尺度的变化,与 EH 湖泊水平数据一致。大麦湖档案记录了整个过渡期间气候变化的半球和区域信号,表明海洋-大气和日照强迫都发挥了作用。我们的古视角强调加州对气候变化的敏感性,以及这种变化如何导致湖沼制度的突然转变。
更新日期:2021-04-01
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