气候变化领域集成服务门户(CCPortal): Abrupt shifts of productivity and sea ice regimes at the western Barents Sea slope from the Last Glacial Maximum to the Bølling-Allerød interstadial

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DOI	10.1016/j.quascirev.2019.105903
	Abrupt shifts of productivity and sea ice regimes at the western Barents Sea slope from the Last Glacial Maximum to the Bølling-Allerød interstadial
	Köseoğlu D.; Belt S.T.; Knies J.
发表日期	2019
ISSN	0277-3791
卷号	222
英文摘要	Advanced knowledge of spatio-temporal constraints on the Barents Sea Ice Sheet during the late Weichselian glaciation overshadows relatively limited understanding of seasonal sea ice (experiencing an annual advance-retreat cycle) and primary productivity trends accompanying massive, abrupt climate changes during glacial-deglacial cycles. Such paleo-reconstructions are crucial prerequisites for improved comprehension and prediction of current and future climate change. Here, we investigate sea ice and phytoplankton biomarker distributions in a Barents Sea sediment core covering ca. 25.8–15.4 cal kyr BP to elucidate abrupt shifts of spring–summer sea ice concentrations and relative sympagic–pelagic productivity trends at the southwestern continental slope. Despite significant presence of seasonal sea ice, the Last Glacial Maximum (LGM) and initial shelf edge deglaciation (SEDG) at the core site are characterised by occurrence of productive coastal polynya adjacent to the maximum ice sheet extent. The onset of perennial (i.e. multi-year) ice cover and near-zero productivity during Heinrich Stadial 1 (HS1; ca. 18.0–16.3 cal kyr BP) accompanies significant meltwater fluxes from ice sheet debuttressing and the consequent stagnation of thermohaline circulation. Rapid sea ice retreat and unprecedented pelagic productivity observed after 16.3 cal kyr BP coincides with areal ice sheet deglaciation and is potentially linked to the release of sub-surface heat and nutrient reservoirs, together with reinvigorated deep water circulation following millennial heating of the deep ocean during HS1. We find that a multivariate fingerprinting approach involving assessment of both downcore and surface biomarker distributions is able to distinguish relative ice-algal and pelagic diatom productivity driven by sea ice dynamics. © 2019 Elsevier Ltd
英文关键词	Arctic Ocean; Barents Sea; Classification tree; Coastal polynya; HBI; IP25; Marine biomarkers; PIP25; Quaternary; Sea ice
语种	英语
scopus关键词	Biomarkers; Climate change; Glacial geology; Glaciers; Phytoplankton; Reservoirs (water); Arctic ocean; Barents sea; Classification trees; Coastal polynya; IP25; PIP25; Quaternary; Sea ice; Allerod; biomarker; Bolling; climate change; deglaciation; heating; Heinrich event; ice sheet; interstadial; Last Glacial Maximum; marine ecosystem; paleoenvironment; phytoplankton; polynya; primary production; Quaternary; reconstruction; sea ice; sediment core; Weichselian; Arctic Ocean; algae; Bacillariophyta
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151751
作者单位	Biogeochemistry Research Centre, School of Geography, Earth and Environmental Sciences, Plymouth University, Plymouth, PL4 8AA, United Kingdom; CAGE – Centre for Arctic Gas Hydrate, Environment and Climate, Department of Geosciences, UiT The Arctic University of Norway, Tromsø, 9037, Norway; Geological Survey of Norway, Trondheim, N-7491, Norway
推荐引用方式 GB/T 7714	Köseoğlu D.,Belt S.T.,Knies J.. Abrupt shifts of productivity and sea ice regimes at the western Barents Sea slope from the Last Glacial Maximum to the Bølling-Allerød interstadial[J],2019,222.
APA	Köseoğlu D.,Belt S.T.,&Knies J..(2019).Abrupt shifts of productivity and sea ice regimes at the western Barents Sea slope from the Last Glacial Maximum to the Bølling-Allerød interstadial.Quaternary Science Reviews,222.
MLA	Köseoğlu D.,et al."Abrupt shifts of productivity and sea ice regimes at the western Barents Sea slope from the Last Glacial Maximum to the Bølling-Allerød interstadial".Quaternary Science Reviews 222(2019).