Biomarker records in sediment core MD99-2272 from North of Iceland Shelf

• Main Authors: Xiao, Xiaotong, Zhao, Meixun, Knudsen, Karen Luise, Sha, Longbin, Eiriksson, Jón, Gudmundsdóttir, Esther Ruth, Jiang, Hui, Guo, Zhigang
• Format: Dataset
• Language: English
• Published: PANGAEA 2017
• Subjects: 2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane per unit sediment mass; 24-Methylcholesta-5,22E-dien-3beta-ol per unit sediment mass; 5<56>Fr; AGE; CALYPSO; Calypso Corer; DEPTH; sediment/rock; IMAGES V; Marion Dufresne (1995); MD114; MD99-2272; n-Alkanol long chain alcohols C26+C28+C30 per unit sediment mass; North Icelandic Shelf; Phytoplankton biomarker Brassicasterol IP25 index; Iceland; Nordic Seas; Sea ice
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.885432; https://doi.org/10.1594/PANGAEA.885432

We present a sea-ice record back to 15 ka (cal. ka BP) based on the sea-ice biomarker IP25, phytoplankton biomarker brassicasterol and terrestrial biomarker long-chain n-alkanols in piston core MD99-2272 from the North Icelandic shelf. During the Bølling/Allerød (14.7-12.9 ka), the North Icelandic shelf was characterized by extensive spring sea-ice cover linked to reduced flow of warm Atlantic Water and dominant Polar water influence, as well as strong meltwater input in the area. This pattern showed an anti-phase relationship with the ice-free/less ice conditions in marginal areas of the eastern Nordic Seas, where the Atlantic Water inflow was strong, and contributed to an enhanced deep-water formation. Prolonged sea-ice cover with occasional occurrence of seasonal sea ice prevailed during the Younger Dryas (12.9-11.7 ka) interrupted by a brief interval of enhanced Irminger Current and deposition of the Vedde Ash, as opposed to abruptly increased sea-ice conditions in the eastern Nordic Seas. The seasonal sea ice decreased gradually from the Younger Dryas to the onset of the Holocene corresponding to increasing insolation. Ice-free conditions and sea surface warming were observed for the Early Holocene, followed by expansion of sea ice during the Mid-Holocene.