Biogeochemical variability during the past 3.6 million years recorded by FTIR spectroscopy in the sediment record of Lake El'gygytgyn, Far East Russian Arctic

Meyer-Jacob, C.; Vogel, H.; Gebhardt, A. C.; Wennrich, V.; Melles, M.; Rosén, P. (2014). Biogeochemical variability during the past 3.6 million years recorded by FTIR spectroscopy in the sediment record of Lake El'gygytgyn, Far East Russian Arctic. Climate of the past, 10(1), pp. 209-220. Copernicus Publications 10.5194/cp-10-209-2014

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Abstract. A number of studies have shown that Fourier
transform infrared spectroscopy (FTIRS) can be applied to
quantitatively assess lacustrine sediment constituents. In this
study, we developed calibration models based on FTIRS
for the quantitative determination of biogenic silica (BSi;
n = 420; gradient: 0.9–56.5 %), total organic carbon (TOC;
n = 309; gradient: 0–2.9 %), and total inorganic carbon (TIC;
n = 152; gradient: 0–0.4 %) in a 318 m-long sediment record
with a basal age of 3.6 million years from Lake El’gygytgyn,
Far East Russian Arctic. The developed partial least squares
(PLS) regression models yield high cross-validated (CV)
R2
CV = 0.86–0.91 and low root mean square error of crossvalidation
(RMSECV) (3.1–7.0% of the gradient for the different
properties). By applying these models to 6771 samples
from the entire sediment record, we obtained detailed
insight into bioproductivity variations in Lake El’gygytgyn
throughout the middle to late Pliocene and Quaternary. High
accumulation rates of BSi indicate a productivity maximum
during the middle Pliocene (3.6–3.3 Ma), followed by gradually
decreasing rates during the late Pliocene and Quaternary.
The average BSi accumulation during the middle
Pliocene was �3 times higher than maximum accumulation
rates during the past 1.5 million years. The indicated progressive
deterioration of environmental and climatic conditions in the Siberian Arctic starting at ca. 3.3 Ma is consistent with
the first occurrence of glacial periods and the finally complete
establishment of glacial–interglacial cycles during the
Quaternary.

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