有机脂类分子重建海洋古温度研究进展

Progresses in the study of organic lipid molecules for reconstruction of paleo-sea temperature

温度是气候变化中一个非常敏感和关键的因子,也是气候模拟试验中不可或缺的边界条件。古温度重建对于理解古气候系统(如大气环流、洋流强度和路径演化历史)及预测未来气候变化都具有重要意义。随着分析测试技术的不断发展,分子有机地球化学温度指标受到高度重视,成为古气候研究的重要手段,迄今为止,已在全球范围内得到了广泛应用。本文综述了U_(37)^(K)、TEX_(86)、NL_(5)、LDI、RI-OH、和RAN_(13)这6种基于有机脂类分子的海洋古温度重建代用指标,包括各指标所涉及的有机生物标志物的结构特征、生物来源、温度响应机制,阐述了各指标的发展历程、基本原理、应用现状,分析了其局限性。为验证重建结果的可靠性提供了理论依据,同时阐释了多指标联用对全面、客观重建古温度的必要性,以及对古气候研究学科发展的重要意义。

Temperature is a very sensitive and crucial factor in climate change,and an indispensable boundary condition in climate modelling.The reconstruction of paleotemperature is of great significance for understanding paleoclimate system such as the evolution of atmospheric circulation,and ocean currents strength and path,as well as for making more accurate predictions of future climate changes.Along with the development of new analytical techniques,organic temperature proxies have been highly valued as an important tool in paleoclimate research and widely applied in temperature reconstruction globally.In this paper,six organic thermometers are reviewed,i.e.U_(37)^(K)、TEX_(86)、RI-OH、LDI、NL_(5)、and RAN_(13)including lipid structural characteristics,biological sources,and mechanism in their responds to temperature.The development history,basic principles,application status,and limitations of each index are also elucidated.Multi-index combination is believed necessary and recommended for reliable reconstruction of paleotemperature,which is significant for the progress of paleoclimate study.