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

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• 作者：Sofia Ribeiro ; Mikael K. Sejr ; Audrey Limoges ; Maija Heikkilä…
• 关键词：Arctic sea ice ; Greenland fjords ; HBIs ; Primary production ; Proxies ; Silica
• 刊名：Ambio
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：46
• 期：1-supp
• 页码：106-118
• 全文大小：10358KB
• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment, general; Ecology; Atmospheric Sciences; Physical Geography; Environmental Management; Environmental Engineering/Biotechnology;
• 出版者：Springer Netherlands
• ISSN：1654-7209
• 卷排序：46

文摘

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.