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首页> 外文期刊>Climate of the Past Discussions >A 350 ka record of climate change from Lake El'gygytgyn, Far East Russian Arctic: refining the pattern of climate modes by means of cluster analysis
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A 350 ka record of climate change from Lake El'gygytgyn, Far East Russian Arctic: refining the pattern of climate modes by means of cluster analysis

机译：远东俄罗斯北极地区El'gygytgyn湖的350 ka气候变化记录：通过聚类分析完善气候模式

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Rock magnetic, biochemical and inorganic records of the sediment cores PG1351 and Lz1024 from Lake El'gygytgyn, Chukotka peninsula, Far East Russian Arctic, were subject to a hierarchical agglomerative cluster analysis in order to refine and extend the pattern of climate modes as defined by Melles et al. (2007). Cluster analysis of the data obtained from both cores yielded similar results, differentiating clearly between the four climate modes warm, peak warm, cold and dry, and cold and moist. In addition, two transitional phases were identified, representing the early stages of a cold phase and slightly colder conditions during a warm phase. The statistical approach can thus be used to resolve gradual changes in the sedimentary units as an indicator of available oxygen in the hypolimnion in greater detail. Based upon cluster analyses on core Lz1024, the published succession of climate modes in core PG1351, covering the last 250 ka, was modified and extended back to 350 ka. Comparison to the marine oxygen isotope (δ18O) stack LR04 (Lisiecki and Raymo, 2005) and the summer insolation at 67.5° N, with the extended Lake El'gygytgyn parameter records of magnetic susceptibility (κLF), total organic carbon content (TOC) and the chemical index of alteration (CIA; Minyuk et al., 2007), revealed that all stages back to marine isotope stage (MIS) 10 and most of the substages are clearly reflected in the pattern derived from the cluster analysis.
机译：对俄罗斯远东北极楚科奇半岛的El'gygytgyn湖沉积岩心PG1351和Lz1024的岩石磁，生化和无机记录进行了等级团聚聚类分析，以细化和扩展由Melles等。 （2007）。从两个核心获得的数据的聚类分析得出相似的结果，清楚地区分了四种气候模式：温暖，高峰温暖，寒冷和干燥以及寒冷和潮湿。此外，确定了两个过渡阶段，分别代表了寒冷阶段的早期阶段和温暖阶段的较冷条件。因此，该统计方法可用于解决沉积单元中的逐渐变化，以更详细地指示次生水体中的可用氧气。根据对核心Lz1024的聚类分析，修改了已发布的涵盖最后250 ka的PG1351核心气候模式系列，并将其扩展回350 ka。与海洋氧同位素（δ 18 O）堆LR04（Lisiecki和Raymo，2005）的比较以及夏季在67.5°N的日照，并具有扩展的El'gygytgyn Lake磁化率参数记录（κ LF ），总有机碳含量（TOC）和化学变化指数（CIA; Minyuk等人，2007）显示，所有阶段都回到了海洋同位素阶段（MIS）10，大部分从聚类分析得出的模式中清楚地反映了子阶段。

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