Archaeal lipid-inferred paleohydrology and paleotemperature of Lake Chenghai during the Pleistocene–Holocene transition

Sun, Weiwei; Zhang, Enlou; Chang, Jie; Shulmeister, James; Bird, Michael I.; Zhao, Cheng; Jiang, Qingfeng; Shen, Ji

Over the past decades, paleoenvironmental studies in the Indian summer monsoon region have mainly focused on precipitation change, with few published terrestrial temperature records from the region. We analysed the distribution of isoprenoid glycerol dialkyl glycerol tetraethers (isoGDGTs) in the sediments of Lake Chenghai in southwest China across the Pleistocene–Holocene transition, to extract both regional hydrological and temperature signals for this important transition period. The lake level was reconstructed from the relative abundance of crenarchaeol in isoGDGTs (%cren) and the inline-formula M1inlinescrollmathml crenarchaeol / crenarchaeol 137pt14ptsvg-formulamathimg64d4f6c65066c5b4af10aa9293da15e3 cp-16-833-2020-ie00001.svg137pt14ptcp-16-833-2020-ie00001.png ratio. The %cren-inferred lake level identified a single lowstand (15.4–14.4 inline-formulaka cal BP), while the inline-formula M3inlinescrollmathml crenarchaeol / crenarchaeol 137pt14ptsvg-formulamathimg65631539eb53db3e20329df6f7a19ac1 cp-16-833-2020-ie00002.svg137pt14ptcp-16-833-2020-ie00002.png ratio suggests a relatively lower lake level between 15.4–14.4 and 12.5–11.7 inline-formulaka cal BP, corresponding to periods of weakened ISM during the Heinrich 1 and Younger Dryas cold event. A filtered TetraEther indeX consisting of 86 carbon atoms (TEXinline-formula86 index) revealed that lake surface temperature was similar to present-day values during the last deglacial period and suggests a substantial warming of inline-formula∼4inline-formulaC from the early Holocene to the mid-Holocene. Our paleotemperature record is generally consistent with other records in southwest China, suggesting that the distribution of isoGDGTs in Lake Chenghai sediments has potential for quantitative paleotemperature reconstruction.

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Sun, Weiwei / Zhang, Enlou / Chang, Jie / et al: Archaeal lipid-inferred paleohydrology and paleotemperature of Lake Chenghai during the Pleistocene–Holocene transition. 2020. Copernicus Publications.

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