The Island of Amsterdamoya: A key site for studying past climate in the Arctic Archipelago of Svalbard

QUATERNARY SCIENCE REVIEWS

卷:183

Article

Bakke, Jostein^1,2  Balascio, Nicholas³  van der Bilt, Willem G. M.^1,2  Bradley, Raymond⁴  D'Andrea, William J.⁵  Gjerde, Marthe^1,2  Olafsdottir, Saedis^1,2  Rothe, Torgeir^1,2  De Wet, Greg⁴ 

[1] Univ Bergen, Dept Earth Sci, Allegaten 41, N-5007 Bergen, Norway

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

[3] Coll William & Mary, Dept Geol, Williamsburg, VA 23187 USA

[4] Univ Massachusetts, Dept Geosci, Climate Syst Res Ctr, Amherst, MA 01003 USA

[5] Columbia Univ, Lamont Doherty Earth Observ, Palisades, NY 10964 USA

关键词: Svalbard;    Holocene;    Paleoclimatology;    Continental biomarkers;    Glacier reconstruction;    Hydrogen isotopes;    Hydrology;    Arctic;    Lake sediments;   

DOI  :  10.1016/j.quascirev.2017.11.005

来源: Elsevier

【 摘 要 】

This paper introduces a series of articles assembled in a special issue that explore Holocene climate evolution, as recorded in lakes on the Island of Amsterdamoya on the westernmost fringe of the Arctic Svalbard archipelago. Due to its location near the interface of oceanic and atmospheric systems sourced from Arctic and Atlantic regions, Amsterdamoya is a key site for recording the terrestrial response to marine and atmospheric changes. We employed multi-proxy approaches on lake sediments, integrating physical, biogeochemical, and isotopic analyses to infer past changes in temperature, precipitation, and glacier activity. The results comprise a series of quantitative Holocene-length paleoclimate reconstructions that reveal different aspects of past climate change. Each of the four papers addresses various facets of the Holocene climate history of north-western Svalbard, including a reconstruction of the Annabreen glacier based on the sedimentology of the distal glacier-fed lake Gjoavatnet, a reconstruction of changing hydrologic conditions based on sedimentology and stratigraphy in Lake Hakluytvatnet, reconstruction of summer temperature based on alkenone paleothermometry from lakes Hakluytvatnet and Hajeren, and a hydrogen isotope-based hydrological reconstruction from lake Hakluytvatnet. We also present high-resolution paleomagnetic secular variation data from the same lake, which document important regional magnetic field variations and demonstrate the potential for use in synchronizing Holocene sedimentary records in the Arctic. The paleoclimate picture that emerges is one of early Holocene warmth from ca. 10.5 ka BP interrupted by transient cooling ca. 10-8ka BP, and followed by cooling that mostly manifested as two stepwise events ca. 7 and 4 ka BR. The past 4ka were characterized by dynamic glaciers and summer temperature fluctuations decoupled from the declining summer insolation. (C) 2017 Elsevier Ltd. All rights reserved.

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