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01.02.2017 | Sonderheft 1/2017 Open Access

Ambio 1/2017

Sea ice and primary production proxies in surface sediments from a High Arctic Greenland fjord: Spatial distribution and implications for palaeoenvironmental studies

Zeitschrift:
Ambio > Sonderheft 1/2017
Autoren:
Sofia Ribeiro, Mikael K. Sejr, Audrey Limoges, Maija Heikkilä, Thorbjørn Joest Andersen, Petra Tallberg, Kaarina Weckström, Katrine Husum, Matthias Forwick, Tage Dalsgaard, Guillaume Massé, Marit-Solveig Seidenkrantz, Søren Rysgaard

Abstract

In order to establish a baseline for proxy-based reconstructions for the Young Sound–Tyrolerfjord system (Northeast Greenland), we analysed the spatial distribution of primary production and sea ice proxies in surface sediments from the fjord, against monitoring data from the Greenland Ecosystem Monitoring Programme. Clear spatial gradients in organic carbon and biogenic silica contents reflected marine influence, nutrient availability and river-induced turbidity, in good agreement with in situ measurements. The sea ice proxy IP25 was detected at all sites but at low concentrations, indicating that IP25 records from fjords need to be carefully considered and not directly compared to marine settings. The sea ice-associated biomarker HBI III revealed an open-water signature, with highest concentrations near the mid-July ice edge. This proxy evaluation is an important step towards reliable palaeoenvironmental reconstructions that will, ultimately, contribute to better predictions for this High Arctic ecosystem in a warming climate.

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