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Calibration and application of brGDGT-based temperature parameters in the twilight zone of the South China Sea  ( SCI-EXPANDED收录 EI收录)  

文献类型:期刊文献

英文题名:Calibration and application of brGDGT-based temperature parameters in the twilight zone of the South China Sea

作者:Ali, Aamir[1];Cao, Jiantao[1];Huang, Chao[2];Li, Hui[1];Jia, Guodong[1]

机构:[1]Tongji Univ, State Key Lab Marine Geol, Shanghai 200092, Peoples R China;[2]Guangdong Ocean Univ, Coll Ocean & Meteorol, Lab Coastal Ocean Variat & Disaster Predict, Zhanjiang 524088, Guangdong, Peoples R China

年份:2025

卷号:253

外文期刊名:GLOBAL AND PLANETARY CHANGE

收录:SCI-EXPANDED(收录号:WOS:001524828700002)、、EI(收录号:20252718711474)、Scopus(收录号:2-s2.0-105009509408)、WOS

基金:National Natural Science Foundation of China (Grants 42030504) supported this work. We thank Dr. Fabienne Marret-Davies and two anonymous reviewers for their insightful input, which helped us to improve the final manuscript.

语种:英文

外文关键词:Branched GDGT; Marine origins; Temperature calibration; Ocean twilight zone; South China Sea; Sediment record

外文摘要:The ocean twilight zone is crucial for climate change and marine biogeochemical cycles, but little is known about its environmental change in the past, due in part to the lack of reliable environmental proxies. Recently, branched glycerol dialkyl glycerol tetraethers (brGDGTs), a class of bacterial cell membrane lipids, have shown potential as a proxy for temperature changes in the twilight zone. Here, we investigated its applicability in a sediment core from the northern South China Sea (SCS) to quantitatively reconstruct twilight zone temperature changes since the last deglaciation. In the sediment core, the brGDGT-based & sum;IIIa/IIa ratios, which serve as a source proxy, ranged from 1.66 to 5.51. These values are significantly higher than global soil values (<0.59), indicating a marine origin of the brGDGTs. The brGDGT-related temperature parameters in the core revealed relatively warm conditions during the last deglaciation and cooler conditions during the Holocene in the northern SCS. This temperature profile aligns with foraminiferal Mg/Ca-derived intermediate water temperature records in the region but diverges from those in the euphotic layer and deep seawater. This consistency confirms the reliability of sedimentary brGDGTs as a temperature proxy in the twilight zone of the northern SCS. Furthermore, using foraminiferal Mg/Ca-derived temperature data as a reference, we established a brGDGTsbased water temperature calibration for the intermediate water in the SCS. This calibration is likely also applicable to other oceanic areas, thus providing a valuable tool for reconstructing seawater temperatures in the twilight zone over long timescales.

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