The potential role of insolation in the long-term climate evolution since the early Pleistocene

IF 4 1区 地球科学 Q1 GEOGRAPHY, PHYSICAL
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引用次数: 0

Abstract

The distribution of insolation over time and space is a significant driver of climate change on orbital timescales. However, the influence of insolation on long-term climate evolution remains poorly understood due to the absence of a discernible long-term trend regulated by Earth's orbit. In this study, we present a sea surface temperature anomaly (SSTA) stack spanning the past 2 Myr, compiled from 26 millennial-resolved records obtained from the global ocean. The global average sea surface temperature (SST) reveals a 405-kyr cycle, as well as a gradual decrease of 2.34 ± 1.05 °C (1σ) from 2000 ka to 940 ka, followed by a period of relative stability. We introduce an index named the integral of annual mean insolation anomaly (IAMIA), which quantifies the continuous departure of annual mean insolation (AMI) from its “normal” cycle over a specific time interval. We find that the SST leads the variations in AMI and IAMIA at the 405-kyr band, intimating that the cycle evident in global SST does not originate from the changes of eccentricity but rather stems from harmonic or combination tones. Notably, IAMIA exhibits a fundamental shift at 935 ka, coinciding with the “900-ka event” observed in the SST. Modeling results support that the “900-ka event” could be driven by the change of cumulative insolation. Additionally, IAMIA underscores the important role of insolation in Pleistocene climate change on the long-term trend through the cumulative response of ocean heat content (OHC) to successive small step-wise insolation changes. Furthermore, we hypothesize that the fundamental changes of insolation around 935 ka, transitioning from a positive state characterized by substantial amplitude to a negative state typified by diminished amplitude, facilitated the onset and progression of the mid-Pleistocene transition (MPT). This investigation provides invaluable insights into the role of insolation in long-term climate evolution.

日照在早更新世以来长期气候演变中的潜在作用
日照在时间和空间上的分布是轨道时间尺度上气候变化的一个重要驱动因素。然而,由于缺乏受地球轨道调节的明显长期趋势,人们对日照对长期气候演变的影响仍然知之甚少。在这项研究中,我们展示了过去 2 Myr 的海面温度异常(SSTA)堆栈,该堆栈由从全球海洋获得的 26 个千年分辨记录汇编而成。全球平均海面温度(SST)显示了一个 405 千年的周期,以及从 2000 ka 到 940 ka 逐渐下降的 2.34 ± 1.05 °C (1σ),随后是一个相对稳定的时期。我们引入了一个名为年平均日照异常积分(IAMIA)的指数,它量化了年平均日照(AMI)在特定时间间隔内持续偏离其 "正常 "周期的情况。我们发现,在 405-kyr 波段,海温引领着年平均日照异常积分(AMI)和年平均日照异常积分(IAMIA)的变化,这表明全球海温的周期并非源于偏心率的变化,而是源于谐波或组合音调。值得注意的是,IAMIA 在 935 ka 出现了基本位移,与海温观测到的 "900 ka 事件 "相吻合。建模结果支持 "900-ka 事件 "可能是由累积日照变化驱动的。此外,IAMIA 通过海洋热含量(OHC)对连续的小幅度日照变化的累积响应,强调了日照在更新世气候变化长期趋势中的重要作用。此外,我们假设 935 ka 前后日照发生了根本性变化,从振幅较大的正态过渡到振幅较小的负态,促进了更新世中期过渡(MPT)的发生和发展。这项研究为了解日照在长期气候演变中的作用提供了宝贵的见解。
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来源期刊
Global and Planetary Change
Global and Planetary Change 地学天文-地球科学综合
CiteScore
7.40
自引率
10.30%
发文量
226
审稿时长
63 days
期刊介绍: The objective of the journal Global and Planetary Change is to provide a multi-disciplinary overview of the processes taking place in the Earth System and involved in planetary change over time. The journal focuses on records of the past and current state of the earth system, and future scenarios , and their link to global environmental change. Regional or process-oriented studies are welcome if they discuss global implications. Topics include, but are not limited to, changes in the dynamics and composition of the atmosphere, oceans and cryosphere, as well as climate change, sea level variation, observations/modelling of Earth processes from deep to (near-)surface and their coupling, global ecology, biogeography and the resilience/thresholds in ecosystems. Key criteria for the consideration of manuscripts are (a) the relevance for the global scientific community and/or (b) the wider implications for global scale problems, preferably combined with (c) having a significance beyond a single discipline. A clear focus on key processes associated with planetary scale change is strongly encouraged. Manuscripts can be submitted as either research contributions or as a review article. Every effort should be made towards the presentation of research outcomes in an understandable way for a broad readership.
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