Ice sheet expansion in the Cretaceous greenhouse world

IF 6.2 3区综合性期刊 Q1 Multidisciplinary Fundamental Research Pub Date : 2024-11-01 DOI:10.1016/j.fmre.2023.05.005

Tianyang Wang , Songlin He , Qinghai Zhang , Lin Ding , Alexander Farnsworth , Fulong Cai , Chao Wang , Jing Xie , Guobiao Li , Jiani Sheng , Yahui Yue

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Abstract

Globally elevated temperatures during the Cretaceous extreme greenhouse climate interval were punctuated by the Valanginian cooling event, which was characterized by a positive carbon isotope excursion, global cooling, and a glacial event approximately at 135 Ma. Disentangling ocean temperature and continental ice volume trends enables us to better understand climate fluctuations over deep time. We investigated the ocean temperature–ice sheet dynamics of glaciation events that occurred in the Cretaceous greenhouse world. New clumped isotope and δ¹⁸O data from sites in the Tethyan Ocean show that seawater temperatures decreased by 5–6 °C, consistent with the development of glacial periods, and maximum ice volumes about half the size of present-day Antarctica. This cooling event provides a counter-example to other Mesozoic climate transitions driven by changes in atmospheric greenhouse gas contents. Our results emphasize the importance of quantitatively reconstructing continental ice volume, providing further support for exploring deep-time Earth climate dynamics.

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白垩纪温室世界的冰盖扩张

在白垩纪极端温室气候期间，全球气温升高被Valanginian冷却事件打断，该事件的特征是碳同位素正偏移，全球变冷和大约135 Ma的冰川事件。解开海洋温度和大陆冰量趋势的纠缠，使我们能够更好地了解长期以来的气候波动。我们研究了发生在白垩纪温室世界的冰川事件的海洋温度-冰盖动力学。来自特提斯海洋的新块状同位素和δ18O数据表明，海水温度下降了5-6°C，与冰期的发展相一致，最大冰量约为当今南极洲的一半。这一降温事件为其他由大气温室气体含量变化驱动的中生代气候转变提供了一个反例。我们的研究结果强调了定量重建大陆冰量的重要性，为探索深时间地球气候动力学提供了进一步的支持。

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