Barash, Max S; Yushina, Irina G; Spielhagen, Robert F (2002): Planktic foraminifers, oxygen- and carbon isotopic compositions, and radiocarbon age in bottom sediments from Core AMK4-316GC [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.762081, Supplement to: Barash, MS et al. (2002): Reconstructions of the Quaternary paleohydrological variability by planktonic foraminifers (North Atlantic, Reykjanes Ridge). Translated from Okeanologiya, 2002, 42(5), 744-756, Oceanology, 42(5), 711-722
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Abstract:
In a sediment core AMK4-316 (460 cm long) on the basis of radiocarbon, oxygen isotope, and lithological data climatostratigraphy is established for time interval about 145 ka. The method of factor analysis and spline interpolation applied to data on distribution of planktic foraminifera species has allowed to reconstruct average annual and seasonal temperatures and salinity at the surface and at depth 100 m. The optimum of the Last Interglaciation (5e) is characterized by maximal temperatures, low amplitudes of seasonal fluctuations, and by increased thickness of the upper homogeneous layer. The glacial hydrological mode has arisen here 115 ka ago. Coolings outstripped appropriate events of the global continental glaciation. Minimal average annual temperatures (4-4.5°C) are reconstructed for 47-45, 42, 36, 29-30, and 10 ka. For 50-30 ka interval numerous strong temperature fluctuations that reflect migrations of the polar front are established. Maximal differences of salinity at the surface and depth 100 m showing influence of melting waters were in the beginning of deglaciations (135 and 20 ka) and repeatedly arose in 50-30 ka interval. The Last Glacial Maximum (18 ka) is characterized by the lowest salinity but not by a peak of low temperatures at the surface. Surface temperature was lowered up to 10 ka. Average annual surface temperature of the Holocene optimum was 2°C above the modern one and 2°C below temperature in the Interglaciation optimum (5e), thickness of the upper homogeneous layer exceeded 100 m.
Project(s):
Archive of Ocean Data (ARCOD)
Coverage:
Latitude: 58.740000 * Longitude: -27.288333
Event(s):
AMK4-316GC * Latitude: 58.740000 * Longitude: -27.288333 * Elevation: -2155.0 m * Location: Reykjanes Ridge * Campaign: AMK4 * Basis: Akademik Mstislav Keldysh * Method/Device: Gravity corer (GC)
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3 datasets
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Datasets listed in this publication series
- Barash, MS; Yushina, IG; Spielhagen, RF (2002): (Table 1) Relative abundances of planktic foraminifers in bottom sediments from Core AMK4-316GC. https://doi.org/10.1594/PANGAEA.762078
- Barash, MS; Yushina, IG; Spielhagen, RF (2002): (Table 2) Oxygen- and carbon isotopic compositions in Core AMK4-316GC. https://doi.org/10.1594/PANGAEA.762079
- Barash, MS; Yushina, IG; Spielhagen, RF (2002): (Table 3) Radiocarbon age of bottom sediments from Core AMK4-316GC. https://doi.org/10.1594/PANGAEA.762080