Tectonic degassing drove global temperature trends since 20 Ma
Tectonic degassing drove global temperature trends since 20 Ma
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DOI：
10.1126/science.abl4353
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发表时间：
2022-07-01
期刊：
影响因子：
56.9
通讯作者：
Wilson, Douglas S.
中科院分区：
文献类型：
--
作者：
Herbert, Timothy D.;Dalton, Colleen A.;Wilson, Douglas S.
中新世气候适宜期（MCO）大约在1700万至1400万年前（Ma），代表了新生代冷却的神秘逆转。海洋古温度记录的综合表明，MCO是叠加在至少19 Ma至10 Ma期间的全球海洋表面温度的局部最高值，在此期间全球温度比现在高10摄氏度。我们对海洋地壳生产的高分辨率全球重建表明，地壳生产率比现代生产率高出35%，直到14 Ma左右，当时生产率开始随着全球气温沿着急剧下降。构造脱气变化的幅度和时间可以解释20 Ma以来大部分冰盖和全球温度的长期演化。
The Miocene Climatic Optimum (MCO) from similar to 17 to 14 million years ago (Ma) represents an enigmatic reversal in Cenozoic cooling. A synthesis of marine paleotemperature records shows that the MCO was a local maximum in global sea surface temperature superimposed on a period from at least 19 Ma to 10 Ma, during which global temperatures were on the order of 10 degrees C warmer than at present. Our high-resolution global reconstruction of ocean crustal production, a proxy for tectonic degassing of carbon, suggests that crustal production rates were similar to 35% higher than modern rates until similar to 14 Ma, when production began to decline steeply along with global temperatures. The magnitude and timing of the inferred changes in tectonic degassing can account for the majority of long-term ice sheet and global temperature evolution since 20 Ma.