摘要
长链不饱和酮是一种广泛存在于第四纪海洋沉积物中的生物标志物。其不饱和指数UK37能够在较短的时间尺度上 ( 1～ 1 0 0 0 a)定量刻划海水表层温度的灵敏变化 ,因而成为恢复古海水表层温度变化、识别气候突变事件的有效参数。长链不饱和酮分子的碳同位素与海水中的溶解 CO2 浓度之间具有确定的关系 ,因而可以用其定量恢复第四纪海水溶解 CO2 浓度和大气 CO2 分压。长链不饱和酮及其碳同位素已成为研究第四纪气候突变事件及驱动机制的新工具。
Alkenones, extensively reserved in the Quaternary marine sediments, is a kind of biomarkers. Its unsaturated index, U K 37 , can quantitatively depict the change of the sea surface temperature (SST) on the much more short time scales than oxygen isotopic composition (δ 18 O), so that it has become a useful parameter for reconstruction of SST and recognition of abrupt climatic change. In addition, carbon isotopic composition of alkenones molecular is exactly related to the concentration of CO 2 dissolved in sea surface water, therefore, can be used to reconstruct the concentration of CO 2 dissolved in sea surface water [ CO 2 (aq)], and then, to reconstruct the partial pressure of atmospheric carbon dioxide (P CO 2 ). Alkenones and its carbon isotope have become a new tool for study of abrupt climatic change and related dynamic mechanism. Introduced in the present paper are the principles, methodology and procedures for assessment of abrupt climatic change during the Quaternary, using alkenones and its carbon isotope.
出处
《黄渤海海洋》
CSCD
2000年第1期66-73,共8页
Journal of Oceanography of Huanghai & Bohai Seas
基金
国家自然科学基金!4 970 60 68
