Abstract

Scanning micro-X-ray fluorescence analysis with synchrotron radiation was applied to obtain the depth-variation profiles of element compositions of banded clays in Peyungda Lake (Krasnoyarsk krai, Evenkia) located 30 km southwest of the epicenter of the Tunguska event (1908). The age model was confirmed by a dated layer of anomalous thickness related to the fall and explosion of the Tunguska Cosmic Body (TCB). The variations in the element content in dated core layers were compared with the instrumental meteorological observation data over the last century. The regional average annual temperature and element compositions of the coeval bottom sediments (transfer function) were found to be interrelated. The approximation of the transfer function to the sampling depth of the sedimentary section made it possible to reconstruct the air temperature in the studied region over the past 1000 years. The average annual temperature reconstructions in the study area compared with the global temperature reconstructions in the Arctic region for the same period made it possible to reveal general trends and extreme values.

中文翻译：

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根据佩永达湖（克拉斯诺亚尔斯克边疆区，埃文基亚）底部沉积物的岩性-地球化学数据，近千年来东西伯利亚北极地区的气候变化

摘要

采用同步辐射扫描微 X 射线荧光分析，获得了位于通古斯事件（1908 年）震中西南 30 公里处的 Peyungda 湖（克拉斯诺亚尔斯克边疆区，埃文基亚）带状粘土元素组成的深度变化剖面。与通古斯卡宇宙体（TCB）的坠落和爆炸有关的一层异常厚度的测年数据证实了年龄模型。将测年核心层元素含量变化与上世纪仪器气象观测数据进行比较。研究发现，区域年平均温度和同期底部沉积物的元素组成（传递函数）是相互关联的。沉积剖面采样深度的传递函数的近似使得重建研究区域过去1000年的气温成为可能。研究区年平均气温重建与同期北极地区全球气温重建的比较可以揭示总体趋势和极值。