Disentangling Effects of Sea Surface Temperature and Water Depth on Hydroxylated Isoprenoid GDGTs: Insights From the Hadal Zone and Global Sediments

Wenjie Xiao*, Yunping Xu, Chuanlun Zhang*, Jian Lin, Weichao Wu, L. Xiaoxia, Jingqian Tan, Xi Zhang, Fengfeng Zheng, Xiuqing Song, Yuanqing Zhu, Yi Yang, Hongrui Zhang, Frank Wenzhöfer, Ashley A. Rowden, Ronnie N. Glud

*Kontaktforfatter

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

15 Downloads (Pure)

Abstract

Hydroxylated isoprenoid glycerol dialkyl glycerol tetraethers (OH-GDGTs) preserved in marine sediments are thought to be controlled by sea surface temperature (SST). However, water depth may also exert a significant influence on OH-GDGTs. Here, we investigated sedimentary OH-GDGTs in the Kermadec and Atacama trench regions (2,560–9,560 m water depth). Sedimentary OH-GDGTs in hadal trenches were dominated by OH-GDGT-0 (72 ± 8%), potentially reflecting an adaption of source organisms to ambient cold deep water. This result, combined with global data set, revealed that the predominance of OH-GDGT-0 is a ubiquitous phenomenon in deep-sea sediments, leading to a considerable underestimation of RI-OH′-derived SSTs. By considering both SST and water depth effects, we developed more accurate OH-GDGT-based paleothermometers for both shallow regions and the global ocean, encompassing the full-ocean-depth range. Our findings highlight the importance of accounting for the effect of water depth on OH-GDGTs and provide improved tools for reconstructing paleo-SSTs.

OriginalsprogEngelsk
Artikelnummere2023GL103109
TidsskriftGeophysical Research Letters
Vol/bind50
Udgave nummer15
Antal sider12
ISSN0094-8276
DOI
StatusUdgivet - 16. aug. 2023

Bibliografisk note

Funding Information:
We thank Drs. Susanne Fietz and Jerome Kaiser for providing previously published data. This research was supported by the State Key R&D project of China Grant (2018YFA0605800), the National Natural Science Foundation of China (42206040, 42276033, 41976030), the Danish National Research Foundation Grant DNRF145 via the Danish Center for Hadal Research, and the Shanghai Sheshan National Geophysical Observatory (Grant 2020Z01). The voyages were made possible by the HADES-ERC Advanced Grant (669947), the Coasts & Oceans Centre of New Zealand's National Institute of Water & Atmospheric Research (TAN1711).

Funding Information:
We thank Drs. Susanne Fietz and Jerome Kaiser for providing previously published data. This research was supported by the State Key R&D project of China Grant (2018YFA0605800), the National Natural Science Foundation of China (42206040, 42276033, 41976030), the Danish National Research Foundation Grant DNRF145 via the Danish Center for Hadal Research, and the Shanghai Sheshan National Geophysical Observatory (Grant 2020Z01). The voyages were made possible by the HADES‐ERC Advanced Grant (669947), the Coasts & Oceans Centre of New Zealand's National Institute of Water & Atmospheric Research (TAN1711).

Publisher Copyright:
© 2023. The Authors.

Fingeraftryk

Dyk ned i forskningsemnerne om 'Disentangling Effects of Sea Surface Temperature and Water Depth on Hydroxylated Isoprenoid GDGTs: Insights From the Hadal Zone and Global Sediments'. Sammen danner de et unikt fingeraftryk.

Citationsformater