Temporal and spatial LGM variability of biomarker records in the Arctic Ocean


Autoria(s): Xiao, Xiaotong; Stein, Ruediger; Fahl, Kirsten
Cobertura

MEDIAN LATITUDE: 83.662406 * MEDIAN LONGITUDE: 150.519638 * SOUTH-BOUND LATITUDE: 77.603800 * WEST-BOUND LONGITUDE: 2.381667 * NORTH-BOUND LATITUDE: 89.000000 * EAST-BOUND LONGITUDE: -2.556800 * DATE/TIME START: 1991-07-18T21:03:00 * DATE/TIME END: 2008-09-24T00:33:00

Data(s)

27/03/2015

Resumo

Using the sea ice proxy IP25 and phytoplankton-derived biomarkers (brassicasterol and dinosterol) Arctic sea-ice conditions were reconstructed for Marine Isotope Stage (MIS) 3 to 1 in sediment cores from the north of Barents Sea continental margin across the Central Arctic to the Southern Mendeleev Ridge. Our results suggest more extensive sea-ice cover than present-day during MIS 3, increasing sea-ice growth during MIS 2 and decreased sea-ice cover during the last deglacial. The summer ice edge sustained north of the Barents Sea even during extremely cold (i.e., Last Glacial Maximum (LGM)) as well as warm periods (i.e., Bølling-Allerød). During the LGM, the western Svalbard margin and the northern Barents Sea margin areas were characterized by high concentrations of both IP25 and phytoplankton biomarkers, interpreted as a productive ice-edge situation, caused by the inflow of warm Atlantic Water. In contrast, the LGM high Arctic proper (north of 84°N) was covered by thick permanent sea ice throughout the year with rare break up, indicated by zero or near-zero biomarker concentrations. The spring/summer sea-ice margin significantly extended southwards to the southern Lomonosov Ridge and Mendeleev Ridge during the LGM. Our proxy reconstructions are very consistent with published model results based on the North Atlantic/Arctic Ocean Sea Ice Model (NAOSIM).

Formato

application/zip, 8 datasets

Identificador

https://doi.pangaea.de/10.1594/PANGAEA.845021

doi:10.1594/PANGAEA.845021

Idioma(s)

en

Publicador

PANGAEA

Direitos

CC-BY: Creative Commons Attribution 3.0 Unported

Access constraints: unrestricted

Fonte

Supplement to: Xiao, Xiaotong; Stein, Ruediger; Fahl, Kirsten (2015): MIS 3 to MIS 1 temporal and LGM spatial variability in Central Arctic Ocean sea-ice cover: Reconstruction from biomarkers. Paleoceanography, submitted

Palavras-Chave #2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane per unit mass total organic carbon; 24-Methylcholesta-5,22E-dien-3beta-ol per unit mass total organic carbon; 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol per unit mass total organic carbon; AWI_Paleo; Brassicasterol/TOC; Carbon, organic, total; Carbon sulphur analyzer; Comment; Depth; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Depth bot; Depth top; Dinosterol/TOC; Event; Gas chromatography - Mass spectrometry (GC-MS); IP25/TOC; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Reference; Reference/source; TOC
Tipo

Dataset