High temperatures in the terrestrial mid-latitudes during the early Palaeogene
High temperatures in the terrestrial mid-latitudes during the early Palaeogene
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DOI：
10.1038/s41561-018-0199-0
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发表时间：
2018-07
影响因子：
18.3
通讯作者：
B. Naafs;M. Rohrssen;G. Inglis;O. Lähteenoja;S. Feakins;M. Collinson;E. M. Kennedy;P. Singh;M. Singh;D. Lunt;R. Pancost
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文献类型：
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作者：
B. Naafs;M. Rohrssen;G. Inglis;O. Lähteenoja;S. Feakins;M. Collinson;E. M. Kennedy;P. Singh;M. Singh;D. Lunt;R. Pancost
早古近纪(56-48 -MYR)提供了有关平衡高地气候系统的有价值的信息。在这个温室时期，高海洋温度被重建，但陆地温度估计比预期的要低。海洋和陆地温度之间的这种不匹配一直很难调和。在这里，我们介绍了一种新校准的分支甘油二烷基甘油四醚古温度计在古代褐煤(泥炭化石)中的地球温度估计。我们的结果表明，早古近纪中纬度地区的年平均气温为23-29 °C(不确定度为± 4.7 °C)，比大多数以前的估计高出5-10 °C。在这些褐煤中发现的古生物标记物，以前只在嗜热性和超嗜热性环境中观察到，支持这些高温估计。这些估计的中纬度陆地温度与重建的海洋温度一致，表明早古近纪陆地区域比之前想象的要温暖得多。
The early Paleogene (56–48 Myr) provides valuable information about the Earth’s climate system in an equilibrium highworld. High ocean temperatures have been reconstructed for this greenhouse period, but land temperature estimates have been cooler than expected. This mismatch between marine and terrestrial temperatures has been difficult to reconcile. Here we present terrestrial temperature estimates from a newly calibrated branched glycerol dialkyl glycerol tetraether-based palaeothermometer in ancient lignites (fossilized peat). Our results suggest early Palaeogene mid-latitude mean annual air temperatures of 23–29 °C (with an uncertainty of ± 4.7 °C), 5–10 °C higher than most previous estimates. The identification of archaeal biomarkers in these same lignites, previously observed only in thermophiles and hyperthermophilic settings, support these high temperature estimates. These mid-latitude terrestrial temperature estimates are consistent with reconstructed ocean temperatures and indicate that the terrestrial realm was much warmer during the early Palaeogene than previously thought.