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首页> 外文期刊>Nature >Evidence for decoupling of atmospheric CO2 and global climate during the Phanerozoic eon.
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Evidence for decoupling of atmospheric CO2 and global climate during the Phanerozoic eon.

机译：在生代世以来，大气中的二氧化碳与全球气候脱钩的证据。

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Atmospheric carbon dioxide concentrations are believed to drive climate changes from glacial to interglacial modes, although geological and astronomical mechanisms have been invoked as ultimate causes. Additionally, it is unclear whether the changes between cold and warm modes should be regarded as a global phenomenon, affecting tropical and high-latitude temperatures alike, or if they are better described as an expansion and contraction of the latitudinal climate zones, keeping equatorial temperatures approximately constant. Here we present a reconstruction of tropical sea surface temperatures throughout the Phanerozoic eon (the past approximately 550 Myr) from our database of oxygen isotopes in calcite and aragonite shells. The data indicate large oscillations of tropical sea surface temperatures in phase with the cold-warm cycles, thus favouring the idea of climate variability as a global phenomenon. But our data conflict with a temperature reconstruction using an energy balance model that is forced by reconstructed atmospheric carbon dioxide concentrations. The results can be reconciled if atmospheric carbon dioxide concentrations were not the principal driver of climate variability on geological timescales for at least one-third of the Phanerozoic eon, or if the reconstructed carbon dioxide concentrations are not reliable.
机译：尽管已将地质和天文机制作为最终原因，但据认为大气中的二氧化碳浓度会导致气候变化从冰川转变为冰川间模式。此外，目前尚不清楚冷模式和暖模式之间的变化是否应被视为全球性的现象，是否会同时影响热带和高纬度温度，或者是否可以更好地将其描述为纬向气候带的扩张和收缩，保持赤道温度近似恒定。在这里，我们从方解石和文石壳中的氧同位素数据库中，提出了整个生代时代（过去约550 Myr）热带海表温度的重建。数据表明，热带海面温度与冷暖周期同相的大幅振荡，因此倾向于将气候多变性作为一种全球现象。但是我们的数据与使用能量平衡模型的温度重建相冲突，该能量平衡模型是由重建的大气中二氧化碳浓度来强迫的。如果对于至少三分之一的生代世代，大气二氧化碳浓度不是地质时间尺度上气候变化的主要驱动力，或者重建的二氧化碳浓度不可靠，则结果可以被证实。

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