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

Artikel i vetenskaplig tidskrift
Författare M. Gjerde
J. Bakke
W. J. D'Andrea
N. L. Balascio
R. S. Bradley
K. Vasskog
S. Olafsdottir
T. O. Rothe
B. B. Perren
Anne Hormes
Publicerad i Quaternary Science Reviews
Volym 183
Sidor 164-176
ISSN 0277-3791
Publiceringsår 2018
Publicerad vid Institutionen för geovetenskaper
Sidor 164-176
Språk en
Länkar https://doi.org/10.1016/j.quascirev...
Ämnesord Holocene, Neoglacial, Paleolimnology, Lake sediments, Runoff, Svalbard, Arctic ocean, sea-ice sheet, rock glaciers, spitsbergen, sediments, climate, bacillariophyta, fluctuations, deglaciation, carbonate, ignition, Physical Geography, Geology
Ämneskategorier Klimatforskning, Geologi, Fysisk geografi

Sammanfattning

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.

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