千年尺度气候变化集成数据集（1.5百万年来）

来自陆地、海洋和冰芯的大量记录表明，过去80万年来，地球气候经历了千年尺度快速变化，其振幅与冰期旋回有关。在中更新世气候转型之前，全球冰期旋回的变幅较小和周期较快，气候快速变化与冰期旋回的关系尚不清楚。由于缺乏更新世长尺度高分辨率的大陆和海洋记录，阻碍对千年气候变化的演化和动力学的理解。本数据集整合了北大西洋、伊比利亚边缘、巴尔干半岛（奥赫里德湖）和中国黄土高原百年分辨率的元素时间序列。这些元素代用指标表明，过去150万年期间，千年尺度气候变化在北半球中纬度地区普遍持续存在。本研究结果显示，千年尺度气候变化的幅度不仅受冰期下垫面边界条件的强烈调制，而且也受到岁差和倾角变化的持续影响。本研究整合四个对气候突变敏感的元素地球化学指标，构建一个新的千年尺度气候变化代表性序列，为进一步评估轨道和千年气候变化之间的动力关联提供了关键地质数据。

Numerous records from terrestrial, marine, and ice core archives demonstrate that Earth’s climate has undergone millennial-scale rapid changes over the past 800,000 years, with their amplitudes linked to glacial cycles. Prior to the Mid-Pleistocene Transition (MPT), global glacial cycles had smaller amplitudes and shorter periods, and the relationship between rapid climate changes and glacial cycles remained unclear. The scarcity of long-timescale, high-resolution continental and marine records from the Pleistocene has hindered understanding of the evolution and dynamics of millennial-scale climate changes. This dataset compiles centennial-resolution elemental time series from the North Atlantic, Iberian Margin, Balkan Peninsula (Lake Ohrid), and the Chinese Loess Plateau. These elemental proxies reveal that millennial-scale climate changes have persisted ubiquitously across the mid-latitude Northern Hemisphere over the past 1.5 million years. The findings of this study show that the amplitude of millennial-scale climate changes is not only strongly modulated by glacial underlying surface boundary conditions, but also continuously influenced by variations in Earth’s orbital precession and obliquity. This study integrates four elemental geochemical proxies sensitive to abrupt climate changes to construct a new representative record of millennial-scale climate changes, providing critical geological data for further evaluating the dynamic linkages between orbital and millennial-scale climate changes.

搜集汇总

背景与挑战

背景概述

该数据集整合了北半球中纬度地区四个关键区域的百年分辨率元素时间序列，覆盖1.5百万年的时间跨度，揭示了千年尺度气候变化的持续存在及其与冰期旋回和轨道参数的关联。数据集为研究更新世气候变化动力学提供了关键地质证据。