The cause of Late Cretaceous cooling: A multimodel-proxy comparison
The cause of Late Cretaceous cooling: A multimodel-proxy comparison
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DOI：
10.1130/g38363.1
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发表时间：
2016-11
期刊：
影响因子：
5.8
通讯作者：
C. Tabor;C. Poulsen;D. Lunt;N. Rosenbloom;B. Otto‐Bliesner;P. Markwick;E. Brady;A. Farnsworth;R. Feng
中科院分区：
文献类型：
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作者：
C. Tabor;C. Poulsen;D. Lunt;N. Rosenbloom;B. Otto‐Bliesner;P. Markwick;E. Brady;A. Farnsworth;R. Feng
代理温度重建表明，从塞诺莫尼亚到马斯特里赫特有戏剧性的降温。然而，考虑到整个晚白垩世构造和温室气体变化的同时气候影响，这种冷却的空间范围和机制仍然不确定。在这里，为了更好地理解晚白垩世气候变化，我们比较了几种使用两种不同地球系统模型的白垩纪气候模拟，并汇编了来自塞诺马尼亚和马斯特里赫特的海表面温度替代模型。总体而言，不同模型之间的表面温度响应是一致的，这为我们的发现提供了信心。我们对模拟结果和模型的比较证实，晚白垩世降温是一种普遍现象，可能是由于温室气体浓度降低超过二氧化碳浓度的一半，而不是古地理的变化。
Proxy temperature reconstructions indicate a dramatic cooling from the Cenomanian to Maastrichtian. However, the spatial extent of and mechanisms responsible for this cooling remain uncertain, given simultaneous climatic influences of tectonic and greenhouse gas changes through the Late Cretaceous. Here we compare several climate simulations of the Cretaceous using two different Earth system models with a compilation of sea-surface temperature proxies from the Cenomanian and Maastrichtian to better understand Late Cretaceous climate change. In general, surface temperature responses are consistent between models, lending confidence to our findings. Our comparison of proxies and models confirms that Late Cretaceous cooling was a widespread phenomenon and likely due to a reduction in greenhouse gas concentrations in excess of a halving of CO 2 , not changes in paleogeography.