Xiao, Xiaotong; Zhao, Meixun; Knudsen, Karen Luise; Sha, Longbin; Eiriksson, Jón; Gudmundsdóttir, Esther Ruth; Jiang, Hui; Guo, Zhigang (2017): Biomarker records in sediment core MD99-2272 from North of Iceland Shelf [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.885432, Supplement to: Xiao, X et al. (2017): Deglacial and Holocene sea-ice variability north of Iceland and response to ocean circulation changes. Earth and Planetary Science Letters, 472, 14-24, https://doi.org/10.1016/j.epsl.2017.05.006
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Abstract:
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.
Coverage:
Latitude: 66.992833 * Longitude: -17.974833
Date/Time Start: 1999-08-01T00:00:00 * Date/Time End: 1999-08-01T00:00:00
Minimum DEPTH, sediment/rock: 3.405 m * Maximum DEPTH, sediment/rock: 17.805 m
Event(s):
MD99-2272 (5<56>Fr) * Latitude: 66.992833 * Longitude: -17.974833 * Date/Time: 1999-08-01T00:00:00 * Elevation: -440.0 m * Recovery: 22.6 m * Location: North Icelandic Shelf * Campaign: MD114 (IMAGES V) * Basis: Marion Dufresne (1995) * Method/Device: Calypso Corer (CALYPSO)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, sediment/rock | Depth sed | m | Eiriksson, Jón | Geocode | |
| 2 | AGE | Age | ka BP | Eiriksson, Jón | Geocode | |
| 3 | 2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane per unit sediment mass | IP25/sed | ng/g | Xiao, Xiaotong | ||
| 4 | 24-Methylcholesta-5,22E-dien-3beta-ol per unit sediment mass | Brassicasterol/sed | µg/g | Xiao, Xiaotong | ||
| 5 | n-Alkanol long chain alcohols C26+C28+C30 per unit sediment mass | C26+C28+C30 n-A.ol/sed | µg/g | Xiao, Xiaotong | ||
| 6 | Phytoplankton biomarker Brassicasterol IP25 index | PBIP25 | Xiao, Xiaotong |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
912 data points