Journal of Marine Sciences ›› 2019, Vol. 37 ›› Issue (1): 30-39.DOI: 10.3969/j.issn.1001-909X.2019.01.005

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Contents and distribution of GDGTs in surface sediments of Ross Sea, Antarctic and their environmental significances

CHEN Wen-shen1,2, YU Pei-song1,2, HAN Xi-bin1,3, ZHAO Jun1,2, PAN Jian-ming*1,2   

  1. 1. Second Institute of Oceanography, MNR, Hangzhou 310012, China;
    2. Key Laboratory of Marine Ecosystem and Biogeochemistry, SOA, Hangzhou 310012, China;
    3. Key Laboratory of Submarine Geosciences, SOA, Hangzhou 310012, China
  • Received:2017-06-08 Revised:2019-01-07 Online:2019-03-15 Published:2022-11-21

Abstract: The contents and distribution of Glycerol Dialkyl Glycerol Tetraethers (GDGTs) in 15 surface sediment samples from Ross Sea, Antarctica were analyzed. Besides, the source of GDGTs and environmental implications of TEX86 were disscussed. The results show that the content of GDGTs is from 93.67 to 2 663.37 ng/g with the isoprenoid GDGTs accounts for 90.33%98.56%, which are much more higher than those of branched GDGTs. Isoprenoid GDGTs have significant positive correlation with branched GDGTs (R2=0.88,p<0.01). The result indicates that isoprenoid GDGTs come from marine Archaea while branched GDGTs are mainly from bacteria in sea waters and sediments. Correlation analysis with the WOA database shows that the TEXL86 index reconstructed temperatures are of significant positive correlation with the sea surface temperatures in summer in the study area. Thus,the TEXL86 could be used as a potential index for paleo-SST reconstruction in the Ross Sea.

Key words: Ross Sea, sediment, GDGTs, TEX86

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