Arc-continent collisions in the tropics set Earth's climate state
Arc-continent collisions in the tropics set Earth's climate state
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DOI：
10.1126/science.aav5300
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发表时间：
2019-04-12
期刊：
影响因子：
56.9
通讯作者：
Jagoutz, Oliver
中科院分区：
文献类型：
--
作者：
Macdonald, Francis A.;Swanson-Hysell, Nicholas L.;Jagoutz, Oliver
在数百万年的时间尺度上，地球经历了温暖的无冰和寒冷的冰川气候，但目前还不清楚这些背景气候状态之间的转变是否是二氧化碳源或汇变化的结果。低纬度弧-陆碰撞被假设为通过在温暖潮湿的热带地区挖掘和侵蚀镁铁质和超镁铁质岩石来驱动冷却，从而增加地球通过化学风化固碳的潜力。为了更好地限制全球气候的时间，所有主要的古生代弧-大陆碰撞的古地理位置进行了重建，并比较冰盖的纬度分布。这一分析揭示了热带地区冰川作用的程度与弧-陆碰撞之间的强相关性。地球的气候状态主要是由全球气候适应性决定的，而全球气候适应性则随着弧-陆碰撞的纬度分布而变化。
On multimillion-year time scales, Earth has experienced warm ice-free and cold glacial climates, but it is unknown whether transitions between these background climate states were the result of changes in carbon dioxide sources or sinks. Low-latitude arc-continent collisions are hypothesized to drive cooling by exhuming and eroding mafic and ultramafic rocks in the warm, wet tropics, thereby increasing Earth's potential to sequester carbon through chemical weathering. To better constrain global weatherability through time, the paleogeographic position of all major Phanerozoic arc-continent collisions was reconstructed and compared to the latitudinal distribution of ice sheets. This analysis reveals a strong correlation between the extent of glaciation and arc-continent collisions in the tropics. Earth's climate state is set primarily by global weatherability, which changes with the latitudinal distribution of arc-continent collisions.