古菌生物标志物古海水温度指标TEX_(86)研究进展  

USING ARCHAEA BIOMARKER INDEX TEX_(86) AS A PALEO-SEA SURFACE TEMPERATURE PROXY

作　　者：赵美训[1,2] 李大伟[1,2] 邢磊[1,2] 

机构地区：[1]中国海洋大学海洋化学理论与工程技术教育部重点实验室,青岛266100 [2]中国海洋大学海洋有机地球化学研究所,青岛266100

出　　处：《海洋地质与第四纪地质》2009年第3期75-84,共10页Marine Geology & Quaternary Geology

基　　金：国家自然科学基金项目(40776029;40730844;40706021;40621063);国家重点基础研究发展规划项目(2007CB815904)

摘　　要：TEX86是最近几年提出的一个古海水温度重建指标,它是基于由古菌的一个分支Marine Crenarchaeota所产生的一组生物标志物(GDGTs)的比值。培养实验、水体颗粒物及大洋表层沉积物的研究结果都显示,温度是TEX86指标的主要影响因素,而盐度、营养盐等其他环境因子对TEX86指标无明显影响。由于陆源物质中也含有少量GDGTs,TEX86重建近海温度记录会有较大的误差。但是TEX86和另一个生物标志物指标BIT的同时测定也使TEX86用于近海古温度重建。与通常用的U3K7′古海水温度指标相比,TEX86指标可以应用于高于29℃的高温海域,目前已被成功地应用于地质历史中高温期古海水温度的重建。TEX86指标将为重建西太平洋古温度记录提供一种有效的方法。TEX86 index is a relatively new paleo-sea surface temperature （SST） proxy, based on the ratio of a newly discovered group of biomarkers, glycerol dialkyl glycerol tetraethers（GDGTs）, which are produced by marine archaea Crenarchaeota. Results based on laboratory culture and analyses of both particulate organic matter and surface sediments from the global oceans all indicate that SST is the main environmental control on the TEX86 index; while salinity, nutrient concentration and other factors have no obvious influences on it. However, terrestrial materials also contain low contents of GDGTs, so large errors can occur when the TEX86 index is applied to coastal and shallow marine environments. But simultaneous use of both the TEX86 index and another biomarker index BIT can ensure the accurate reconstruction of shallow water SST. In contrast to the commonly used U^κ′37 index, the TEX86 index can be applied to warm water regions with SST higher than 29℃, and this index has been successfully applied to the reconstruction of warmer period SSTs in the past. Thus, the TEX86 has great potential for SST reconstructions of the western Pacific which includes the western Pacific Warm Pool and many marginal seas.

关 键 词：古海水温度 海洋古菌 生物标志物 TEX86 

分 类 号：P736.22[天文地球—海洋地质]