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首页> 外文期刊>The holocene >Coherent late-Holocene climate-driven shifts in the structure of three Rocky Mountain lakes
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Coherent late-Holocene climate-driven shifts in the structure of three Rocky Mountain lakes

机译：全新落基山脉气候相关变化在三个落基山湖的结构中的变化

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摘要

Large-scale atmospheric pressure centers, such as the Aleutian and Icelandic Low, have a demonstrated relationship with physical lake characteristics in contemporary monitoring studies, but the responses to these phenomena are rarely observed in lake records. We observe coherent changes in the stratification patterns of three deep (>30 m) lakes inferred from fossil diatom assemblages as a response to shifts in the location and intensity of the Aleutian Low and compare these changes with similar long-term changes observed in the delta O-18 record from the Yukon. Specifically, these records indicate that between 3.2 and 1.4 ka, the Aleutian Low shifted westward, resulting in an increased frequency of storm tracks across the Pacific Northwest during winter and spring. This change in atmospheric circulation ultimately produced deeper mixing in the upper waters of these three lake systems. Enhanced stratification between 4.5 and 3.3 ka and from 1.3 ka to present suggests a strengthened Aleutian Low and more meridional circulation.
机译：在当代监测研究中，诸如阿留申群岛和冰岛低气压等大型大气压力中心已证明与湖泊的物理特征有关，但在湖泊记录中很少观察到对这些现象的反应。我们观察到由化石硅藻组合推断出的三个深层（> 30 m）湖泊分层模式的连贯变化，作为对阿留申低压区位置和强度变化的响应，并将这些变化与三角洲中观测到的类似长期变化进行了比较育空地区的O-18战绩。具体而言，这些记录表明，阿留申低压在3.2到1.4 ka之间向西移动，导致冬季和春季整个西北太平洋地区的风暴径频率增加。大气环流的这种变化最终在这三个湖泊系统的上层水域产生了更深层的混合。从4.5 ka到3.3 ka以及从1.3 ka到现在的分层增强表明阿留申低压增强和子午环流增强。

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