EGU2020-809
https://doi.org/10.5194/egusphere-egu2020-809
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Late Holocene glacier and climate reconstruction from proglacial records in Vatnsdalur, northern Iceland.

Konstantin Nebel1, Timothy Lane1, Kathryn Adamson2, Iestyn Barr2, Willem van der Bilt3, Jason Kirby1, and Rick Hennekam4
Konstantin Nebel et al.
  • 1School of Biological and Environmental Sciences, Liverpool John Moores University, Liverpool, United Kingdom of Great Britain and Northern Ireland
  • 2Department of Natural Sciences, Manchester Metropolitan University, Manchester, United Kingdom of Great Britain and Northen Ireland
  • 3Department of Earth Sciences, University of Bergen, Bergen, Norway
  • 4Royal Netherlands Institute for Sea Research, Texel, Netherlands

The Arctic region is experiencing surface air temperature increase of twice the global average. To better understand Holocene Arctic climate variability, there is the need for continuous, high-resolution palaeoclimate archives. Sediment cores from proglacial lakes can provide such climate archives, and have the potential to record past environmental change in detail.       

Vatnsdalur, a valley in northern Iceland, hosts small, climatically sensitive cirque glaciers that became independent from the Iceland Ice Sheet after its retreat following the Last Glacial Maximum (c. 15 ka BP). Importantly, this region is located at the confluence of warm water and air masses from the south and cold polar water and air masses from the north, making it highly sensitive to North Atlantic and Arctic climate change. However, at present the region is highly understudied, lacking any high-resolution climate reconstructions.           

To address this, we combine geomorphological mapping with the first high-resolution analysis of proglacial lake sediments, to thoroughly examine northern Iceland Late Holocene environmental change.

Field mapping supplemented by high-resolution drone data was used to characterise catchment geomorphology, including seven Holocene moraines. A sediment core (SKD-P1-18) from proglacial lake Skeiðsvatn, Vatnsdalur, was analysed for sedimentological (dry bulk density, loss-on-ignition, grain size), geophysical (magnetic susceptibility) and geochemical (X-ray fluorescence core scan, 2 mm resolution) parameters.            
We identify three main sedimentary facies from these analyses, indicating variations in glacial input and catchment environmental conditions. Radiocarbon dating of lake macrofossils, supplemented by tephrochronology, provides a chronological framework. Catchment point samples, also analysed using the above analytical techniques, were used for sediment fingerprinting to disentangle non-glacial from glacial end-members.

Our results indicate the disappearance and reformation of small, climatically sensitive cirque glaciers in Vatnsdalur during the Holocene. We interpret the data to show an abrupt return to a glaciated catchment. Our results fill a geographical gap of high-resolution proglacial sediment studies in the Arctic-North Atlantic region.

How to cite: Nebel, K., Lane, T., Adamson, K., Barr, I., van der Bilt, W., Kirby, J., and Hennekam, R.: Late Holocene glacier and climate reconstruction from proglacial records in Vatnsdalur, northern Iceland., EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-809, https://doi.org/10.5194/egusphere-egu2020-809, 2019

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