过去全球变化研究中环境地球化学进展

THE ADVANCES OF ENVIRONMENTAL GEOCHEMISTRY IN THE STUDY OF PAST GLOBAL CHANGE

由于自然档案中稳定同位素组成对气候变化的有效指示作用，环境地球化学研究对古全球变化研究起着十分重要的作用，长期以来被看成古全球变化科学的基石。本文从时间尺度、空间尺度和气候驱动因素等方面的环境地球化学研究，论述了近年来取得的一些新进展。

Past Global Change (PAGES) is one of the IGBP Core Projects aimed at providing a quantitative understanding of the Earth′s past environment changes,defining the envelope of natural environmental variability and assessing anthropogenic impact on the Earth's biosphere, geosphere and atmosphere. Isotope geochemistry is considered a cornerstone of PAGES science. Firstl, isotope-dating methods are of high accuracy for reconstructing the chronology of various climate records. Secondly, isotope composition is widely used by the paleo-community on a large variety of records as reliable climate indicators and its role in quantitative estimates of paleoclimates worthy particularly to be mentioned. In this paper, some most prominent recent advances of geochemical researches in the PAGES science are presented, in both spatial and temporal aspects. Moreover, the roles of isotope studies in the identification of potential climate forcing are also summarized.