深海氧同位素第3阶段古气候—海平面变化研究进展

PROGRESS OF THE STUDIES OF PALEOCLIMATE AND SEA LEVEL CHANGES IN THE MARINE OXYGEN ISOTOPE STAGE 3

根据近年来的主要研究成果,简要综述了深海氧同位素第3阶段(MIS 3)气候—海平面变化特征及其沉积记录的研究进展。MIS3期间的气候变化是古气候研究中的重要组成部分,该时段的某些气候特征与现今十分类似。取自极地冰心、海洋沉积物和陆地的古气候记录表明,在MIS3阶段全球经历了一系列数百年至千年时间尺度的快速气候突变事件,其成因、机制和影响范围还存在明显的不确定性。利用深海沉积物的氧同位素、珊瑚礁阶地、陆源碎屑沉积记录分析得出的MIS3古海平面高度偏差较大,主要认为在-50～-90m之间波动,但也有研究表明MIS3海平面可达-15～-20m。对MIS3古气候和海平面变化的深入研究,有赖于全球范围内更多不同类型和高分辨率的地质记录所提供的证据。

This paper attempts to summarize the recent progress of the studies of paleoclimate and sea level changes and their sedimentary records during the period of the marine oxygen isotopic stage 3（MIS 3）.The paleoclimaic change during the MIS 3 is an important topic of the global paleoclimate research,since some of its characteristics are similar to those of today.All the evidence from ice cores and oceanic and terrestrial deposits indicates that the Earth＇s climate system experienced a series of rapid changes during that period on centennial to millennial timescales.However,the causes,mechanisms and impacts of these abrupt climatic events remain uncertain.The sea levels in MIS 3 estimated from marine oxygen isotopes,coral reef terraces and terrigenous clastic sedimentary records are quite deviated.The majority of the researchers believes that the sea level fluctuation during that period were in a range of-50 to-90 m,but another school suggests that it was-15 to-20 m only,much less than the previous estimation.In-depth researches of paleoclimate and sea-level changes in the future are required based on more high-resolution evidence from various channels in a global scope.