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We report 1900-year long records of alknone concentration, C38/C37 ratio, and U37k, U37k' and a newly-developed alkenone unsaturation index U37k''-based temperatures in a sediment core retrieved from Kusai Lake in the northern Qinghai-Tibetan Plateau. The predominance of C37 and C38 alkenones with minor presence of C39 and C40 alkenones, and the absence of C38 methyl alkenones are indicative of alkneones...
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