地球气候地质规律的不稳定性
近日，加州大学河滨分校Andy Ridgwell团队研究了地球气候地质规律的不稳定性。相关论文于2025年9月25日发表在《科学》杂志上。
气候和大气二氧化碳（CO2）之间的负反馈，由陆地上硅酸盐矿物的风化作用介导，被认为提供了地球气候在地质时间尺度上的主要调节。
相比之下，研究组发现涉及有机物质的更快的反馈不仅对地球系统的恢复至关重要，而且还可能产生意想不到的不稳定性。该地球系统模型实验表明，沉积有机碳埋藏，被氧化还原敏感的磷再生放大，可以超过硅酸盐风化，并矛盾地推动气候过度冷却，以应对大量二氧化碳的释放。这种不稳定性取决于硅酸盐风化和有机碳埋藏之间的初始平衡以及全球磷循环的状态。它在海洋氧化还原的中间状态中表现得最为强烈，这可能有助于他们了解过去冰河时代的时间。
附：英文原文
Title: Instability in the geological regulation of Earth’s climate
Author: Dominik Hülse, Andy Ridgwell
Issue&Volume: 2025-09-25
Abstract: Negative feedback between climate and atmospheric carbon dioxide (CO2), mediated by the weathering of silicate minerals on land, is thought to provide the primary regulation of Earth’s climate on geological timescales. By contrast, we found that faster feedbacks involving organic matter are not only critical to Earth system recovery but can also create unexpected instability. Our Earth system model experiments show how sedimentary organic carbon burial, amplified by redox-sensitive phosphorus regeneration, can outweigh silicate weathering and paradoxically drive climate overcooling in response to massive CO2 release. This instability depends on the initial balance between silicate weathering and organic carbon burial in addition to the state of global phosphorus cycling. It is most strongly expressed at intermediate ocean redox states, which may help us understand the timing of past ice ages.
DOI: adh7730