title: Sea ice and primary production proxies in surface sediments from a High Arctic Greenland fjord: Spatial distribution and implications for palaeoenvironmental studies.
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 IP25was detected at all sites but at low concentrations, indicating that IP25records 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.
authors.affiliation: Department of Glaciology and Climate, Geological Survey of Denmark and Greenland, Øster Voldgade 10, 1350, Copenhagen K, Denmark. sri@geus.dk.
authors.forename: Sofia
authors.initials: S
authors.lastname: Ribeiro
authors.affiliation: Arctic Research Centre, Aarhus University, Ny Munkegade bldg. 1540, 8000, Aarhus C, Denmark.
authors.forename: Mikael K
authors.initials: MK
authors.lastname: Sejr
authors.affiliation: Department of Glaciology and Climate, Geological Survey of Denmark and Greenland, Øster Voldgade 10, 1350, Copenhagen K, Denmark.
authors.forename: Audrey
authors.initials: A
authors.lastname: Limoges
authors.affiliation: Environmental Change Research Unit (ECRU), Department of Environmental Sciences, University of Helsinki, P.O. Box 65 (Viikinkaari 1), 00014, Helsinki, Finland.
authors.forename: Maija
authors.initials: M
authors.lastname: Heikkilä
authors.affiliation: IGN, Øster Voldgade 10, 1350, Copenhagen K, Denmark.
authors.forename: Thorbjørn Joest
authors.initials: TJ
authors.lastname: Andersen
authors.affiliation: Department of Environmental Sciences, University of Helsinki, P.O. Box 65, 00014, Helsinki, Finland.
authors.forename: Petra
authors.initials: P
authors.lastname: Tallberg
authors.affiliation: Environmental Change Research Unit (ECRU), Department of Environmental Sciences, University of Helsinki, P.O. Box 65 (Viikinkaari 1), 00014, Helsinki, Finland.
authors.forename: Kaarina
authors.initials: K
authors.lastname: Weckström
authors.affiliation: Fram Centre, Norwegian Polar Institute, P.O. Box 6606, Langnes, 9296, Tromsø, Norway.
authors.forename: Katrine
authors.initials: K
authors.lastname: Husum
authors.affiliation: Department of Geosciences, UiT - The Arctic University of Norway in Tromsø, Postboks 6050, Langnes, 9037, Tromsø, Norway.
authors.forename: Matthias
authors.initials: M
authors.lastname: Forwick
authors.affiliation: Arctic Research Centre, Aarhus University, Ny Munkegade bldg. 1540, 8000, Aarhus C, Denmark.
authors.forename: Tage
authors.initials: T
authors.lastname: Dalsgaard
authors.affiliation: Unité Mixte Internationale Takuvik, CNRS & Université Laval, Pavillon Alexandre-Vachon 1045, Avenue de la Médecine, Québec, QC, G1V 0A6, Canada.
authors.forename: Guillaume
authors.initials: G
authors.lastname: Massé
authors.affiliation: Department of Geoscience and Arctic Research Centre, Centre for Past Climate Studies, Aarhus University, Høegh-Guldbergs Gade, 28000, Aarhus C, Denmark.
authors.forename: Marit-Solveig
authors.initials: MS
authors.lastname: Seidenkrantz
authors.affiliation: Clayton H Riddell Faculty of Environment Earth and Resources, University of Manitoba, Winnipeg, MB, R3T 2N2, Canada.
authors.forename: Søren
authors.initials: S
authors.lastname: Rysgaard
mesh_terms: D002244:Carbon / Q000032:analysis / Q000737:chemistry; D057486:Carbon Cycle; D057231:Climate Change; D064308:Ecological Parameter Monitoring; D063366:Estuaries; D019015:Geologic Sediments / Q000737:chemistry*; D046448:Ice Cover
chemical_list: D002244:Carbon
keywords: Arctic sea ice; Greenland fjords; HBIs; Primary production; Proxies; Silica