Ryves, D. B.. Department of Environmental History & Climate, Geological Survey of Denmark & Greenland, dryves@hotmail.com
Battarbee, R. B.. Environmental Change Research Centre, University College London,
Flower, R. J.. Environmental Change Research Centre, University College London,
Jewson, D. Freshwater Laboratory, University of Ulster,
Kuzmina, A. E.. Limnological Institute of the Siberian Academy of Sciences,
Mackay, A. W.. Environmental Change Research Centre, University College London,
Lees, . A.. Coventry University, Centre for Quatemary Science,
Sturm, M. Dept. of Environmental Physics, Sedimentology Section, EAWAG-ETH,

Lake Baikal in south east Siberia is the world's oldest, largest and deepest lake. It contains a sedimentary record of environmental change spanning the last 20 million years at an important site along the PAGES-PEP II transect. In non-glacial periods, diatom production and accumulation is a major component of sediment formation. Endemic diatom stratigraphies have the potential to permit quantitative reconstruction of climatic, or climatically-related, parameters from species assemblages. Two major problems confound this approach to Lake Baikal palaeolimnology: sedimentary erosion and deposition events (turbidites) and diatom dissolution of valves in the water column and at or within the sediment. Here we report results from the international and interdisciplinary NERC-GEOPASS project that has been monitoring contemporary diatom production from living planktonic communities and their transformation, through the water column, to surface sediment assemblages, using a deep-water (1400m) trap array in the southern basin. Diatom abundances, composition and dissolution state are compared throughout the water column and within surface sediments and explored using multivariate techniques. The goal is to quantify diatom dissolution through the reconstitution of the death assemblage, and apply dissolution data to adjust and improve internal diatom-based transfer functions which are being developed in concert as tools of palaeoenvironmental reconstruction.
Day: Thursday, Feb. 4
Time: Poster
Location: Sweeney Center
Code: CS63TH0681S