Overview and significance of a 250 ka paleoclimate record from El'gygytgyn Crater Lake, NE Russia
Overview and significance of a 250 ka paleoclimate record from El'gygytgyn Crater Lake, NE Russia
复制标题
DOI：
10.1007/s10933-006-9017-6
复制
发表时间：
2007-01-01
影响因子：
2.1
通讯作者：
Party, Scientific
中科院分区：
文献类型：
--
作者：
Brigham-Grette, Julie;Melles, Martin;Party, Scientific
本文对西伯利亚东北部El’gygytgyn湖（北纬67度，东经172度）的沉积物柱塞岩心进行了分析，提取了近250 ka的千年气候记录，其沉积学、物理、生物化学和古生态参数具有明显的波动。这项研究产生了五个主要主题。首先，试验岩心和地震数据表明，El'gygytygn火山口湖包含了预计是整个北极地区历史气候变化最长、最连续的陆地记录，可以追溯到撞击时期。其次，El’gygytygn盆地的过程导致了湖泊地质和生物地球化学的变化，这些变化反映了北极西部大部分地区区域气候和古生态的剧烈变化。第三，磁化率等指标记录了大量的快速变化事件。恢复的湖泊沉积物既包含了最后一次间冰期的最佳分辨率记录，也包含了北极地区千年尺度气候变化的最长陆地记录，产生了高保真的多代理记录，比从格陵兰冰盖获得的记录延长了近15万年。第四，评估不同平均气候状态下遥相关的潜力很大。尽管近期北极气候变化具有异质性，但北大西洋/格陵兰地区的千年尺度气候事件记录在北极最远端的可变边界条件下。最后，对El'gygytgyn湖完整沉积记录的深度钻探将为晚新生代北极气候的演变提供新的见解，也许还有惊喜。
Sediment piston cores from Lake El'gygytgyn (67 degrees N, 172 degrees E), a 3.6 million year old meteorite impact crater in northeastern Siberia, have been analyzed to extract a multi-proxy millennial-scale climate record extending to nearly 250 ka, with distinct fluctuations in sedimentological, physical, biochemical, and paleoecological parameters. Five major themes emerge from this research. First the pilot cores and seismic data show that El'gygytygn Crater Lake contains what is expected to be the longest, most continuous terrestrial record of past climate change in the entire Arctic back to the time of impact. Second, processes operating in the El'gygytygn basin lead to changes in the limnogeology and the biogeochemistry that reflect robust changes in the regional climate and paleoecology over a large part of the western Arctic. Third, the magnetic susceptibility and other proxies record numerous rapid change events. The recovered lake sediment contains both the best-resolved record of the last interglacial and the longest terrestrial record of millennial scale climate change in the Arctic, yielding a high fidelity multi-proxy record extending nearly 150,000 years beyond what has been obtained from the Greenland Ice Sheet. Fourth, the potential for evaluating teleconnections under different mean climate states is high. Despite the heterogeneous nature of recent Arctic climate change, millennial scale climate events in the North Atlantic/Greenland region are recorded in the most distal regions of the Arctic under variable boundary conditions. Finally, deep drilling of the complete depositional record in Lake El'gygytgyn will offer new insights and, perhaps, surprises into the late Cenozoic evolution of Arctic climate.