The sediment succession of Lake Emanda in the Yana Highlands was investigated to reconstruct the regional late Quaternary climate and environmental history. Hydro‐acoustic data obtained during a field campaign in 2017 show laminated sediments in the north‐western and deepest (up to ̃15 m) part of the lake, where a ̃6‐m‐long sediment core (Co1412) was retrieved. The sediment core was studied with a multi‐proxy approach including sedimentological and geochemical analyses. The chronology of Co1412 is based on ¹⁴C AMS dating on plant fragments from the upper 4.65 m and by extrapolation suggests a basal age of c. 57 cal. ka BP. Pronounced changes in the proxy data indicate that early Marine Isotope Stage (MIS) 3 was characterized by unstable environmental conditions associated with short‐term temperature and/or precipitation variations. This interval was followed by progressively colder and likely drier conditions during mid‐MIS 3. A lake‐level decline between 32.0 and 19.1 cal. ka BP was presumably related to increased continentality and dry conditions peaking during the Last Glacial Maximum (LGM). A subsequent rise in lake level could accordingly have been the result of increased rainfall, probably in combination with seasonally high meltwater input. A milder or wetter Lateglacial climate increased lake productivity and vegetation growth, the latter stabilizing the catchment and reducing clastic input into the lake. The Bølling‐Allerød warming, Younger Dryas cooling and Holocene Thermal Maximum (HTM) are indicated by distinct changes in the environment around Lake Emanda. Unstable, but similar‐to‐present‐day climatic and environmental conditions have persisted since c. 5 cal. ka BP. The results emphasize the highly continental setting of the study site and therefore suggest that the climate at Lake Emanda was predominantly controlled by changes in summer insolation, global sea level, and the extent of ice sheets over Eurasia, which influenced atmospheric circulation patterns.

中文翻译：

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最后一个c。西伯利亚东北亚的Yana高地的气候和环境变化。57 000年，源自埃曼达湖的沉积岩心

研究了亚那高地艾曼达湖的沉积物演替，以重建区域晚期第四纪气候和环境历史。在2017年的一次野外运动中获得的水声数据显示，该湖西北部和最深处（最深̃15 m）的层状沉积物被回收，在那里回收了一个m6米长的沉积物芯（Co1412）。采用多种代理方法研究了沉积物芯，包括沉积学和地球化学分析。Co1412的年代学基于¹⁴ C AMS，该数据来自4.65 m上部的植物碎片，通过外推法可知c的基本年龄。57卡路里 ka BP。替代数据的显着变化表明，早期海洋同位素阶段（MIS）3的特征是与短期温度和/或降水变化相关的不稳定环境条件。在此间隔之后，MIS 3中期逐渐变冷，可能更干燥。湖泊水位在32.0和19.1 cal之间下降。ka BP可能与增加的大陆性和干旱条件在上一次冰河最高峰（LGM）期间达到峰值有关。因此，随后湖泊水位上升可能是降雨增加的结果，可能与季节性的高融水投入相结合。晚冰川气候的温和或湿润增加了湖泊的生产力和植被的生长，后者稳定了流域并减少了向湖中的碎屑输入。Bølling-Allerød变暖，Emanda湖周围环境的明显变化表明了年轻的树精降温和全新世的最高热量（HTM）。自那时以来，不稳定的，但与现在相似的气候和环境条件仍然存在c。5卡路里 ka BP。结果强调了研究地点的高度大陆性环境，因此表明埃曼达湖的气候主要受夏季日照变化，全球海平面以及欧亚大陆上冰盖范围的变化控制，从而影响了大气环流模式。