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- W1920199254 abstract "In this study we investigated samples from a sediment core (PS2837-5) obtained from the western Yermak Plateau (northern Fram Strait, northwest of Svalbard) closely located to today’s (and past) summer sea ice margin. The main aim of the study was to reconstruct sea ice variability throughout the last 30 kyrs BP, using specific biomarkers and, in particular, the so-called “IP25”. This recently established proxy, a C25 highly branched isoprenoid, is biosynthesized by sea ice restricted diatoms [2]. Thus, the presence and variability of IP25 in sediments may be used as a direct hint for sea ice coverage and variability. As such, the identification of IP25 in sediments from the Yermak Plateau may allow for monitoring changes in sea ice cover in northern Fram Strait during the transition from the last Glacial to the Holocene interglacial interval. In addition to the information provided by IP25 we considered further biomarker and bulk proxy data to avoid ambiguity. Brassicasterol, a biomarker molecule ascribed to open-water algae, and the sediment bulk organic-carbon contents complement our study for a more precise paleoenvironmental reconstruction. Due to relatively high sedimentation rates, it was even possible to detect short-term climatic events. We defined periods of different sea ice conditions for the Late Weichselian (constant sea ice margin), the Last Glacial Maximum (perennial sea ice cover), the Bolling warm phase (dominantly ice-free) and the Early to Mid Holocene (seasonally ice-covered). These intervals can be correlated with climatic fluctuations, i.e., an increase (decrease) in sea ice coverage coincided with a decrease (increase) in warm Atlantic water influx." @default.
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- W1920199254 date "2009-04-01" @default.
- W1920199254 modified "2023-09-26" @default.
- W1920199254 title "Variability of sea ice cover in northern Fram Strait during the past 30 ka: A biomarker approach" @default.
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