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Paleoproductivity changes in Lake Baikal over the past 250,000 years

Paleoclimatic changes in the Eurasian continental interior have been well documented in the Lake Baikal sediments, which have a linkage with global paleoclimatic changes (BDP-96 (LEG 11) Members 1997). Diatoms have been important primary producers in Lake Baikal. As a result, biogenic silica (BioSi) is a major component ofLake Baikal sediments (EDLUND & STOERMER 2000). BioSi concentrations of Lake Baikal sediments reflect climatically-induced changes in the production of phytoplankton (KARABANOV et al. 1998). WATANABE et al. (2003, 2004) conducted high-resolution analyses of total organic carbon (TOC) and total nitrogen (TN) concentrations as well as stable carbon isotope ratios of TOC (ô13Croc) in the Ver98-l St.5 sediment core from Lake Baikal. In this paper, a high-resolution biogenic silica profile from the Ver98-l St.5 sediment core is presented. Here we estimated the changes of paleoproductivity in Lake Baikal over the past 250,000 years (250 kyr) by BioSi, TOC, TN and d13Croc in the sediment core.