Table_1_Spring Succession and Vertical Export of Diatoms and IP25 in a Seasonally Ice-Covered High Arctic Fjord.XLS

• Main Authors: Audrey Limoges, Guillaume Massé, Kaarina Weckström, Michel Poulin, Marianne Ellegaard, Maija Heikkilä, Nicolas-Xavier Geilfus, Mikael K. Sejr, Søren Rysgaard, Sofia Ribeiro
• Format: Dataset
• Language: unknown
• Published: 2018
• Subjects: Solid Earth Sciences; Climate Science; Atmospheric Sciences not elsewhere classified; Exploration Geochemistry; Inorganic Geochemistry; Isotope Geochemistry; Organic Geochemistry; Geochemistry not elsewhere classified; Igneous and Metamorphic Petrology; Ore Deposit Petrology; Palaeontology (incl. Palynology); Structural Geology; Tectonics; Volcanology; Geology not elsewhere classified; Seismology and Seismic Exploration; Glaciology; Hydrogeology; Natural Hazards; Quaternary Environments; Earth Sciences not elsewhere classified; Evolutionary Impacts of Climate Change; climate change; Arctic sea-ice; HBIs; diatoms; paleoenvironmental reconstructions; climate proxy; Northeast Greenland; Arctic; Greenland; Antarc*; Antarctica; Climate change; Paleo-Arctic; Sea ice
• Online Access: https://doi.org/10.3389/feart.2018.00226.s001; https://figshare.com/articles/Table_1_Spring_Succession_and_Vertical_Export_of_Diatoms_and_IP25_in_a_Seasonally_Ice-Covered_High_Arctic_Fjord_XLS/7460816

The biomarker IP 25 and fossil diatom assemblages preserved in seafloor sediments are commonly used as proxies for paleo Arctic sea-ice reconstructions, but how their production varies over the seasons and is exported to the sediment remains unclear. We analyzed IP 25 concentrations and diatom assemblages from a 5-week consecutive series of sea-ice cores and compared the results with sediment trap and surface sediment samples collected at the same site in the Young Sound fjord, Northeast Greenland. Our aim was to investigate the dynamics of diatom colonization of the spring sea ice and the in situ production of IP 25 . Additionally, selected diatom taxa observed in the sea-ice samples were isolated from in-ice assemblages and their lipid composition was analyzed via gas chromatography-mass spectrometry. We confirm that Haslea spicula (and not the closely related species H. crucigeroides) is an IP 25 -producer. All three known IP 25 -producing taxa (Haslea spicula, H. kjellmanii, and Pleurosigma stuxbergii var. rhomboides) were present in Young Sound sea-ice and the low IP 25 concentrations measured in the sea-ice (0.44–0.72 pg mL −1 ) were consistent with the low abundance of these source species (0.21–9.66 valves mL −1 ). Total sympagic diatom production also remained very low (21–985 valves mL −1 ), suggesting that the fjord's sea ice did not provide an optimal physical-chemical environment for diatoms to thrive. Temporal changes in the sympagic diatom community were also observed, with an early presence of the pelagic Thalassiosira hyperborea and subsequent dominance of pennate taxa, including Nitzschia and Navicula species, Fossula arctica and Stauronella arctica. The assemblages observed during and after the seasonal ice melt consisted primarily of Fossula arctica, Fragilariopsis oceanica, Thalassiosira antarctica var. borealis (resting spores), and Chaetoceros spp. (vegetative cells and resting spores). The seafloor sediment assemblages largely reflected the melt and post-melt planktic production and were ...