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(Table 2) Organic geochemistry of sediment core BP99-04/07

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DOI: 10.1594/pangaea.465018
  • 24-Ethylcholest-5-En-3Beta-Ol
  • 24-Ethylcholest-5-En-3Beta-Ol Per Unit Mass Total Organic Carbon
  • 24-Methylcholest-5-En-3Beta-Ol
  • 24-Methylcholest-5-En-3Beta-Ol Per Unit Mass Total Organic Carbon
  • 4Alpha
  • 23
  • 24-Trimethyl-5Alpha-Cholest-22E-En-3Beta-Ol
  • 4Alpha
  • 23
  • 24-Trimethyl-5Alpha-Cholest-22E-En-3Beta-Ol Per Unit Mass Total Organic Carbon
  • Akademik Boris Petrov
  • Awi_Paleo
  • Bp99
  • Bp99-04/07
  • Calculated
  • Carbon
  • Organic
  • Total
  • Carbon Preference Index
  • Element Analyser Chn
  • Leco Cns 2000
  • Gas Chromatography
  • Gas Chromatography - Mass Spectrometry (Gc-Ms)
  • Gravity Corer
  • Long-Chain N-Alkanes
  • C27H56+C29H60+C31H64 Per Unit Mass Total Organic Carbon
  • Long-Chain N-Alkanes
  • C27H56+C29H60+C31H64 Per Unit Sediment Mass
  • Paleoenvironmental Reconstructions From Marine Sediments @ Awi
  • Short-Chain N-Alkanes
  • C15H32+C17H36+C19H40 Per Unit Sediment Mass
  • Short-Chain N-Alkanes
  • C15H32+C17H36+C19H40 Per Unit Total Organic Carbon
  • Siberian River Run-Off
  • Sirro


poster EGU 2012MMeheust 4- Data from sediment cores: Late Quaternary variability • Kastenlot SO202-18-6 Sea surface temperature and IP25 measurement Total Organic Carbon and Sterols measurement -IP25- -Sea Surface Temperature- Marie Méheust, Kirsten Fahl, and Ruediger Stein Alfred Wegener Institute for Polar and Marine Research, Columbusstrasse, Bremerhaven 27568, Germany Coincident with the low SST observed during the Younger Dryas, the concentration of IP25 is high, which may suggest an extension of spring sea ice coverage in Bering Sea during this period. Between the early and mid-Holocene, the sediment is strongly laminated. The alkenone-based SST shows an increase in temperature, and the absence of IP25 may be in- terpreted as open-water conditions. However, only 4 samples from this interval have been studied so far, i.e., further data are needed before a more detailed interpretation is possible. From the mid-Holocene to the late Holocene, we observe an increase of IP25 as well as the PIP25index, which may suggest an advance of the sea ice margin in Bering Sea. TOC content in this core varies between 0,33 wt % and 1,085 wt%. Highest TOC values are found in the laminated sediment and refer to an increase of input and/or preservation of the organic carbon. Preliminary age model from Kuehn, Gersonde et al., 2011, unpublis- hed) In order to reconstruct the sea-ice cover, the newly developed so-called „IP25 Index“ was used (Belt et al., 2007; Müller et al., 2009). We found this specific biomarker only in the 3 northern most surface sediment samples of the INOPEX cruise, which highlight the presence of sea ice in this area. The absence of the IP25 in the rest of the sediments samples may reflect the modern dominantly open water condition through the year. The core material study within this project was collected during RV Sonne Cruise202 (INOPEX) (5th of July to the 28th of August 2009; Gersonde et al., 2010) in the (sub-) polar North Pacific and Bering Sea. The o

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