南极罗斯海表层沉积物GDGTs含量分布及其环境意义

doi:10.3969/j.issn.1001-909X.2019.01.005

摘要/Abstract

摘要： 通过分析罗斯海15个表层沉积物中甘油双烷基甘油四醚(Glycerol Dialkyl Glycerol Tetraethers,GDGTs)的含量与分布,探讨了各种GDGTs来源及TEX₈₆指标的环境意义。结果表明:表层沉积物中GDGTs总含量为93.67~2 663.37 ng/g,其中类异戊二烯GDGTs(IsoGDGTs)占90.33%~98.56%,远高于支链GDGTs(BrGDGTs)。类异戊二烯GDGTs与支链GDGTs具有显著的耦合关系(R²=0.88,p<0.01)。沉积物中的IsoGDGTs主要来源于海洋奇古菌,BrGDGTs主要由海洋水体和沉积物中原位细菌所产生。应用TEX^L₈₆公式估算研究区SST,与WOA夏季表层温度呈现较好的线性关系,表明TEX^L₈₆指标在罗斯海具有适用性,可作为重建古海洋温度的替代指标。

关键词: 罗斯海, 沉积物, GDGTs, TEX₈₆

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 TEX^L₈₆ index reconstructed temperatures are of significant positive correlation with the sea surface temperatures in summer in the study area. Thus,the TEX^L₈₆ could be used as a potential index for paleo-SST reconstruction in the Ross Sea.

Key words: Ross Sea, sediment, GDGTs, TEX₈₆

中图分类号:

P736.4⁺1

陈文深, 于培松, 韩喜彬, 赵军, 潘建明. 南极罗斯海表层沉积物GDGTs含量分布及其环境意义[J]. 海洋学研究, 2019, 37(1): 30-39.

CHEN Wen-shen, YU Pei-song, HAN Xi-bin, ZHAO Jun, PAN Jian-ming. Contents and distribution of GDGTs in surface sediments of Ross Sea, Antarctic and their environmental significances[J]. Journal of Marine Sciences, 2019, 37(1): 30-39.

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