A 250 ka oxygen isotope record from diatoms at Lake El'gygytgyn, far east Russian Arctic

• Published in: Climate of the Past
• Main Authors: B. Chapligin, H. Meyer, G. E. A. Swann, C. Meyer-Jacob, H.-W. Hubberten
• Format: Article in Journal/Newspaper
• Language: English
• Published: Copernicus Publications 2012
• Subjects: Environmental pollution; TD172-193.5; Environmental protection; TD169-171.8; Environmental sciences; GE1-350; Arctic; Arctic Lake; EPICA; ice core
• Online Access: https://doi.org/10.5194/cp-8-1621-2012; https://doaj.org/article/eac77e2e98504bd68b049bf0b930f8d8

In 2003 sediment core Lz1024 was drilled at Lake El'gygytgyn, far east Russian Arctic, in an area of the Northern Hemisphere which has not been glaciated for the last 3.6 Ma. Biogenic silica was used for analysing the oxygen isotope composition (δ 18 O diatom ) in the upper 13 m long section dating back about 250 ka with samples dominated by one taxa in the <10 μm fraction ( Cyclotella ocellata ). Downcore variations in δ 18 O values show that glacial-interglacial cycles are present throughout the core and δ 18 O diatom -values are mainly controlled by δ 18 O precipitation . Changes reflect the Holocene Thermal Maximum, the Last Glacial Maximum (LGM) and the interglacial periods corresponding to MIS 5.5 and MIS 7 with a peak-to-peak amplitude between LGM and MIS 5.5 of Δ 18 O = 5.3‰. This corresponds to a mean annual air temperature difference of about 9 °C. Our record is the first continuous δ 18 O diatom record from an Arctic lake sediment core directly responding to precipitation and dating back more than 250 ka and correlates well with the stacked marine δ 18 O LR04 ( r = 0.58) and δD EPICA Dome-C record ( r = 0.69). With δ 18 O results indicating strong links to both marine and ice-core records, records from Lake El'gygytgyn can be used to further investigate the sensitivity of the Arctic climate to both past and future global climatic changes.