Holocene multi-proxy environmental reconstruction from lake Hakluytvatnet, Amsterdamoya Island, Svalbard (79.5°N)

QUATERNARY SCIENCE REVIEWS

卷:183

Article

Gjerde, Marthe^1,2,3  Bakke, Jostein^1,2  D'Andrea, William J.⁴  Balascio, Nicholas L.^4,5  Bradley, Raymond S.^1,2,6  Vasskog, Kristian^1,2  Olafsdottir, Saedis^1,2  Rothe, Torgeir O.^1,2  Perren, Bianca B.⁷  Hormes, Anne^3,8 

[1] Univ Bergen, Dept Earth Sci, Allegaten 41, NO-5007 Bergen, Norway

[2] Univ Bergen, Bjerknes Ctr Climate Res, Allegaten 41, N-5007 Bergen, Norway

[3] Univ Ctr Svalbard, N-9171 Longyearbyen, Norway

[4] Columbia Univ, Lamont Doherty Earth Observ, Palisades, NY USA

[5] Coll William & Mary, Dept Geol, Williamsburg, VA USA

[6] Univ Massachusetts, Dept Geosci, Amherst, MA 01003 USA

[7] British Antarctic Survey, Madingley Rd, Cambridge CB3 0ET, England

[8] Univ Gothenburg, Dept Earth Sci, SE-40530 Gothenburg, Sweden

关键词: Holocene;    Neoglacial;    Paleolimnology;    Lake sediments;    Runoff;    Svalbard;    Arctic ocean;    Sedimentology, lakes, lagoons & swamps;    Multi-proxy analyses;   

DOI  :  10.1016/j.quascirev.2017.02.017

来源: Elsevier

【 摘 要 】

High resolution proxy records of past climate are sparse in the Arctic due to low organic production that restricts the use of radiocarbon dating and challenging logistics that make data collection difficult. Here, we present a new lake record from lake Hakluytvatnet at Amsterdamoya island (79.5 degrees N), the north-westernmost island on Svalbard. Multi-proxy analyses of lake sediments in combination with geomorphological mapping reveal large environmental shifts that have taken place at Amsterdamoya during the Holocene. A robust chronology has been established for the lake sediment core through 28 AMS radiocarbon ages, and this gives an exceptionally well-constrained age control for a lake at this latitude. The Holocene was a period with large changes in the Hakluytvatnet catchment, and the onset of the Neoglacial (ca. 5 ka) marks the start of modern-day conditions in the catchment. The Neoglacial is characterized by fluctuations in the minerogenic input to the lake as well as internal productivity, and we suggest that these fluctuations are driven by atmospherically forced precipitation changes as well as sea ice extent modulating the amount of moisture that can reach Hakluytvatnet. (C) 2017 Elsevier Ltd. All rights reserved.

【 授权许可】

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