圣安德鲁斯大学研究人员在《气候杂志》发表新研究，提出一种解释地球冰期形成机制的理论，指出北半球冰盖扩张可通过引发“隐藏的海洋链式反应”加剧全球降温 1。该研究发现，北半球冰盖的扩张导致北大西洋海水冷却，这些冷水向南流动并扰乱南大洋环流，进而促使海洋吸收更多二氧化碳，最终降低大气中的二氧化碳浓度并触发冰期 1。
主要作者 Madison Shankle 博士主导的这项模拟研究表明，仅对北纬高纬度地区进行冷却处理，即可产生相当于全星球冷却模拟效果74%的二氧化碳清除量 1。这一发现填补了南北半球气候联系的关键理论空白，揭示了孤立的高纬度冷却如何通过改变南大洋特征来促进海洋碳储存 1。
Researchers at the University of St Andrews have proposed a new mechanism to explain the formation of Earth's ice ages, suggesting that a chain reaction in ocean circulation played a critical role. Published in the Journal of Climate, the study led by Dr. Madison Shankle reveals how cooling in the Northern Hemisphere could trigger significant global temperature drops through altered carbon storage dynamics 1.
The research details a specific pathway where the expansion of Northern Hemisphere ice sheets cooled North Atlantic waters, which then flowed southward and disrupted the Southern Ocean's circulation patterns 1. This disruption enabled the ocean to absorb more carbon dioxide, thereby intensifying global cooling 1. According to their simulations, cooling only the highest latitudes of the Northern Hemisphere resulted in a carbon removal effect equivalent to 74% of what would be achieved if the entire planet were cooled 1. This finding bridges a key theoretical gap regarding the climatic connection between the two hemispheres 1.
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