14C concentrations of DIC from Pumayum Co lake water and lakeside plants at the altitude of 5000m on the Tibetan Plateau

Abstract

We collected lake water samples at several depths from the central part of Lake Pumayum Co locating at 5000m MSL on Tibetan Plateau, China, at about 60m deep in August 2006. About 100 ml of water sample was transferred plastic bottle, sealed tightly and brought back to Japan. At the AMS laboratory, dissolved inorganic carbon fraction was separated from each water sample, and analyzed for carbon isotopic ratios (14C/12C and 13C/12C) with a Tandetron AMS at Nagoya University. Terrestrial and water plants were also collected around the lake, and analyzed for carbon isotopic ratios. Depth profiles of DIC contents in the lake water, 14C concentrations and δ13C values of terrestrial and water plants as well as DIC will be discussed.