Lacustrine diatom oxygen isotopes as palaeo precipitation proxy - Holocene environmental and snowmelt variations recorded at Lake Bolshoye Shchuchye, Polar Urals, Russia

被引：2

作者：

Meyer, Hanno ^{[1
]}

Kostrova, Svetlana S. ^{[1
]}

Meister, Philip ^{[1
]}

Lenz, Marlene M. ^{[2
]}

Kuhn, Gerhard ^{[3
]}

Nazarova, Larisa ^{[1
]}

Syrykh, Liudmila S. ^{[4
]}

Dvornikov, Yury ^{[5
]}

机构：

[1] Alfred Wegener Inst, Helmholtz Ctr Polar & Marine Res, Res Unit Potsdam, Telegrafenberg A45, D-14473 Potsdam, Germany

[2] Univ Cologne, Inst Geol & Mineral, Zulpicher Str 49a, D-50674 Cologne, Germany

[3] Alfred Wegener Inst, Helmholtz Ctr Polar & Marine Res, Alten Hafen 26, D-27568 Bremerhaven, Germany

[4] Herzen State Pedag Univ Russia, Moika 48, St Petersburg 191186, Russia

[5] RUDN Univ, Peoples Friendship Univ Russia, Agr Technol Inst, Dept Landscape Design & Sustainable Ecosyst, 6 Miklukho Maklaya St, Moscow 117198, Russia

来源：

QUATERNARY SCIENCE REVIEWS | 2022年 / 290卷

关键词：

Stable oxygen isotopes; Hydrological fluctuations; Biogenic silica; Diatoms; Climate change; Chironomids; Lake sediments; ALPINE GLACIER FLUCTUATIONS; LATEST PLEISTOCENE; CENTRAL KAMCHATKA; NORTHERN URALS; ARCTIC RUSSIA; MASS-BALANCE; WATER-VAPOR; LYADHEJ-TO; CLIMATE; ICE;

D O I：

10.1016/j.quascirev.2022.107620

中图分类号：

P9 [自然地理学];

学科分类号：

0705 ; 070501 ;

摘要：

The diatom oxygen isotope composition (delta O-18(diatom)) from lacustrine sediments helps tracing the hydrological and climate dynamics in individual lake catchments, and is generally linked to changes in temperature and delta O-18(l)ake. Lake Bolshoye Shchuchye (67 degrees 53'N; 66 degrees 19' E; 186 m a.s.l) is the largest and deepest freshwater reservoir in the Polar Urals, Arctic Russia. The diatom oxygen isotope interpretation is supported by modern (isotope) hydrology, local bioindicators such as chironomids, isotope mass-balance modelling and a digital elevation model of the catchment. The Bolshoye Shchuchye delta O-18(diatom) record generally follows a decrease in summer insolation and the northern hemisphere (NH) temperature history. However, it displays exceptional, short-term variations exceeding 5 parts per thousand, especially in Mid and Late Holocene. This centennial-scale variability occurs roughly contemporaneously with and similar in frequency to Holocene NH glacier advances. However, larger Holocene glacier advances in the Lake Bolshoye Shchuchye catchment are unknown and have not left any significant imprint on the lake sediment record. As Lake Bolshoye Shchuchye is deep and voluminous, about 30-50% of its volume needs to be exchanged with isotopically different water within decades to account for these shifts in the delta O-18(diatom) record. A plausible source of water with light isotope composition inflow is snow, known to be transported in surplus by snow redistribution from the windward to the leeward side of the Polar Urals. Here, we propose snow melt variability and associated influx changes being the dominant mechanism responsible for the observed short-term changes in the delta O-18(diatom) record. This is the first time such drastic, centennial-scale hydrological changes in a catchment have been identified in Holocene lacustrine diatom oxygen isotopes, which, for Lake Bolshoye Shchuchye, are interpreted as proxy for palaeo precipitation and, on millennial timescales, for summer temperatures. (C) 2022 The Authors. Published by Elsevier Ltd.

引用

页数：16