Holocene sedimentary environment of a High−Arctic fjord in Nordaustlandet, Svalbard

• Published in: Polish Polar Research
• Main Authors: Ojala, Antti E.K., Salonen, Veli−Pekka, Moskalik, Mateusz, Kubischta, Frauke, Oinonen, Markku
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: Walter de Gruyter GmbH 2014
• Subjects: Ecology; Ecology, Evolution, Behavior and Systematics; Arctic; Nordaustlandet; Svalbard; glacier; Polar Research; Sea ice
• Online Access: http://dx.doi.org/10.2478/popore-2014-0006; https://content.sciendo.com/view/journals/popore/35/1/article-p73.xml; https://www.degruyter.com/view/j/popore.2014.35.issue-1/popore-2014-0006/popore-2014-0006.pdf

Abstract A2.5−metrelong marine core from Isvika bay inNordaustlandet (80°N, 18°E) was AMS 14 C dated and analysed for its sedimentological and magnetic parameters. The studied record was found to cover the entire Holocene and indicates major turnovers in the palaeo− hydrography and sedimentary depositional history. The area was deglaciated at around 11,300 BP. The earlyHolocene has indications of rapidmelting of glaciers and frequent deposition of ice−rafted debris (IRD). The climatic optimum terminated with a probable glacier re−advance event occurring ca. 5800 cal BP. This event caused the deposition of a diamicton unit in Isvika bay, followed by a shift towards a colder and amore stratified hydrographic set− ting. The reduction in IRD indicates gradual cooling, which led to the stratification of the bay and eventually to more persistent fast sea−ice conditions by 2500 cal BP. For the last 500 years, Isvika has again been seasonally open.