Kolling, Henriette Marie; Stein, Ruediger; Fahl, Kirsten; Perner, Kerstin; Moros, Matthias (2018): Geochemical biomarker analyses on sediment cores MSM05/03_343310-5-1 and MSM05/03_343310-2-2 from Disko Bugt, West Greenland [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.885107
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Abstract:
Past sea ice conditions and open water phytoplankton production were reconstructed from a sediment core taken in Disko Bugt, West Greenland, using the sea ice biomarker IP~25~ and other specific phytoplankton biomarker (i.e., brassicasterol, dinosterol, HBI III) records. Our biomarker record indicates that Disko Bugt experienced a gradual expansion of seasonal sea ice during the last 2.2 kyr. Maximum sea ice extent was reached during the Little Ice Age around 0.2 kyr BP. Superimposed on this longer term trend, we find short-term oscillations in open water primary production and terrigenous input, which may be related to the Atlantic Multidecadal Oscillation and solar activity changes as potential climatic trigger mechanisms. A direct sample-to-sample multiproxy comparison of our new biomarker record with microfossil (i.e., benthic foraminifera, dinocysts, and diatoms) and other geochemical records (i.e., alkenone biomarkers) indicates that different proxies are influenced by the complex environmental system with pronounced seasonal changes and strong oceanographic gradients, e.g., freshwater inflow from the Greenland Ice Sheet. Differences in sea ice reconstructions may indicate that the IP~25~ record reflects only the relatively short sea ice season (spring), whereas other microfossil reconstructions may reflect a longer (spring–autumn) interval.
Related to:
Kolling, Henriette Marie; Stein, Ruediger; Fahl, Kirsten; Perner, Kerstin; Moros, Matthias (2018): New insights into sea ice changes over the past 2.2 kyr in Disko Bugt, West Greenland. arktos - The Journal of Arctic Geosciences, 4(1), https://doi.org/10.1007/s41063-018-0045-z
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Coverage:
Median Latitude: 68.647750 * Median Longitude: -53.824825 * South-bound Latitude: 68.647680 * West-bound Longitude: -53.824880 * North-bound Latitude: 68.647820 * East-bound Longitude: -53.824770
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
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2 datasets
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Datasets listed in this publication series
- Kolling, HM; Stein, R; Fahl, K et al. (2018): Geochemical biomarker analyses on sediment core MSM05/3_343310-2-2. https://doi.org/10.1594/PANGAEA.885088
- Kolling, HM; Stein, R; Fahl, K et al. (2018): Geochemical biomarker analyses on sediment core MSM05/3_343310-5-1. https://doi.org/10.1594/PANGAEA.885106