Lipídios como Indicadores de Mudanças Climáticas no Passado 1: Biomarcadores Marinhos

Química Nova

Luiz A. S. Madureira¹ 

[1] ,UFSC Campus Universitário Trindade Departamento de QuímicaFlorianópolis SC

关键词: alkenones;    marine sediments;    North Atlantic;   

DOI  :  10.1590/S0100-40421997000300010

来源: SciELO

【 摘 要 】

The distribution and abundance of specific lipid biomarkers in marine sediments can play an important rule for the reconstruction of past climatic changes. Here, it is shown the use of a widely known paleo Sea Surface Temperature (SST) proxy based on the unsaturation ratio of a suite of long-chain C37 alkenones: the alkenone unsaturation index, U K37'. These compounds are biosynthesised by only a restricted group of prymnesiophyte algae, mostly notably the coccolithophorid Emiliania huxleyi. To ilustrate the importance of the U K37' index as a molecular tool, the correlation between the SST signal derived from the U K37' and other paleoclimatic records examined in a core from the North Atlantic is discussed.

【 授权许可】

CC BY-NC   
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