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, and Shen, Ji (2020) Archaeal lipid-inferred paleohydrology and paleotemperature of Lake Chenghai during the Pleistocene-Holocene transition. Climate of the Past, 16 (3). pp. 833-845.

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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 crenarchaeol'/crenarchaeol ratio. The %cren-inferred lake level identified a single lowstand (15.4-14.4 ka cal BP), while the crenarchaeol'/crenarchaeol ratio suggests a relatively lower lake level between 15.4-14.4 and 12.5-11.7 ka 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 (TEX86 index) revealed that lake surface temperature was similar to present-day values during the last deglacial period and suggests a substantial warming of similar to 4 degrees C 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 Cheng-hai sediments has potential for quantitative paleotemperature reconstruction.

Item ID: 63294
Item Type: Article (Research - C1)
ISSN: 1814-9332
Copyright Information: © Author(s) 2020. This work is distributed underthe Creative Commons Attribution 4.0 License.
Funders: Global Change and Mitigation (GCM), National Natural Science Foundation of China, Chinese Academy of Sciences (CAS), State Key Laboratory of Lake Science and Environment (SKLLSE)
Projects and Grants: GCM 2016YFA0600502, NNSFC 41702183, NNSFC 41572337, CAS Strategic Priority Research Program XDB40010200, SKLLSE 2016SKL003
Date Deposited: 27 May 2020 07:37
FoR Codes: 37 EARTH SCIENCES > 3703 Geochemistry > 370304 Organic geochemistry @ 50%
37 EARTH SCIENCES > 3709 Physical geography and environmental geoscience > 370905 Quaternary environments @ 50%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970104 Expanding Knowledge in the Earth Sciences @ 100%
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