Jones, V. J., Leng, M. J., Solovieva, N., Sloane, H. J. and Tarasov, P.: Holocene climate of the Kola Peninsula; evidence from the oxygen isotope record of diatom silica, Quaternary Science Reviews, 23(7-8), 833–839, doi:10.1016/j.quascirev.2003.06.014, 2004.

Holocene climate of the Kola Peninsula; evidence from the oxygen isotope record of diatom silica

Micromass Optima gas-source mass spectrometer with a MultiPrep automated sample preparation device

Piston cores were split, described, and one half of the core was slab sampled at 1-cm intervals. The boxcore was extruded vertically and sampled every 0.5 cm. Samples were washed in deionized water, oven dried, and homogenized prior to coulometric and isotopic analyses [Yuan, 2003]

The unusual dry climate in the MWE was previously attributed to a contraction of the circumpolar vortex that resulted in the atmospheric jet stream remaining to the north of California throughout much of the MWE [Stine, 1994]. Our results support this hypothesis.

The TIC d18O derived from downcore sediments effectively parallels the anthropogenic lake-level lowering (Figure 2). The anthropogenically induced drought is recorded in downcore sediments as a 6% increase in TIC d18O. During the El Nin?o years of 1982?83 and 1997?98, Walker Lake (like Pyramid Lake) received well above average moisture. The lake volume increased by 28% from its September 1981 value and the d18OL decreased 3.6% during the 1982?83 event [Benson et al., 1991]. This climate-induced wet event was well recorded in downcore sediments as a 3% decrease in TIC d18O (Figures 2b and 2c)

Year AD - based on linear model in Yuan et al. (2004)

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