Characteristics of isoprenoid and branched tetraether lipids in the deep ocean: implications from surface sediments in the seamount area of the Western Pacific Ocean

Sun，Chengpeng1,2,3; Li，Huaiming4; Li，Wenpeng3; Li，Xinxin3,5; Lü，Xiaoxia1,2

2022-03-20

10.1016/j.marchem.2022.104086

MARINE CHEMISTRY   影响因子和分区

0304-4203

1872-7581

The isoprenoid glycerol dialkyl glycerol tetraethers (isoGDGTs) and branched glycerol dialkyl glycerol tetraethers (brGDGTs) in marine sediments have been widely used for paleoceanographic reconstructions. However, their distributions in the deep ocean (> 4000 m) have not been well characterized. This study analyzed GDGTs in surface sediments from the seamount area of Marcus-Wake and Magellan, western Pacific Ocean (4431-5756 m). The results were further compared with published data of GDGTs in the South China Sea (SCS), equatorial Pacific Ocean, and Mariana Trench to reveal the provenance of GDGTs in the deep ocean and their suitability for paleoceanographic reconstruction. The ratios of GDGT-0/crenarchaeol (0.59–1.38) and GDGT-2/3 (10.65–14.78) indicate the contribution from benthic Thaumarchaeota in the seamount area. The isoGDGTs of the surface sediments from the seamount and the Mariana Trench regions were clustered for a redundancy analysis. They are characterized by the similar relative abundance of each isoGDGT, i.e. higher fractional abundance of GDGT-0 (26–49%) than those in the SCS (12–23%) and the equatorial Pacific Ocean (22–28%). This suggests isoGDGTs in the deep ocean (> 4000 m) are for both planktonic and benthic Thaumarchaeota and the benthic Thaumarchaeota likely produce excessive GDGT-0 in the seamount area. For brGDGTs, the higher IIIa/IIa ratios in the seamount area (1.67–4.83) than the marine-derived values (0.92), indicating in-situ production of brGDGTs. The discrepancy (0.7 to 5.0 °C) between sea surface temperature, deduced by TetraEther indeX (TEX), and the observed sea surface temperature is likely due to less input of isoGDGTs from the pelagic Thaumarchaeota but more from the benthic Thaumarchaeota.

Deep ocean GDGTs Pacific Ocean Seamount Surface sediment

SCI

英语

通讯

National Natural Science Foundation of China[41976043,42076029,41720104001] ; Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology[MGQNLM201808] ; Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou)["GML2019ZD0210","K19313901"]

Chemistry ; Oceanography

Chemistry, Multidisciplinary ; Oceanography

WOS:000776071600002

ELSEVIER

GEOSCIENCES

2-s2.0-85124176190

Scopus

1.Hubei Key Laboratory of Marine Geological Resource,China University of Geosciences,Wuhan,430074,China
2.State Key Laboratory of Biogeology and Environmental Geology,China University of Geosciences (Wuhan),Wuhan,430074,China
3.Department of Ocean Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
4.Key Laboratory of Submarine Geosciences,Second Institute of Oceanography,Ministry of Natural Resources,Hangzhou,310012,China
5.Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou),Guangzhou,511458,China

Sun，Chengpeng,Li，Huaiming,Li，Wenpeng,et al. Characteristics of isoprenoid and branched tetraether lipids in the deep ocean: implications from surface sediments in the seamount area of the Western Pacific Ocean[J]. MARINE CHEMISTRY,2022,240.

Sun，Chengpeng,Li，Huaiming,Li，Wenpeng,Li，Xinxin,&Lü，Xiaoxia.(2022).Characteristics of isoprenoid and branched tetraether lipids in the deep ocean: implications from surface sediments in the seamount area of the Western Pacific Ocean.MARINE CHEMISTRY,240.

Sun，Chengpeng,et al."Characteristics of isoprenoid and branched tetraether lipids in the deep ocean: implications from surface sediments in the seamount area of the Western Pacific Ocean".MARINE CHEMISTRY 240(2022).