Evolution of middle to Late Cretaceous oceans-A 55 m.y. record of Earth's temperature and carbon cycle
Evolution of middle to Late Cretaceous oceans-A 55 m.y. record of Earth's temperature and carbon cycle
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DOI：
10.1130/g32701.1
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发表时间：
2012-02-01
期刊：
影响因子：
5.8
通讯作者：
Erbacher, Jochen
中科院分区：
文献类型：
--
作者：
Friedrich, Oliver;Norris, Richard D.;Erbacher, Jochen
新的5500万年对白垩纪中晚期底栖有孔虫三角洲C-13和三角洲O-18的全球汇编表明，在白垩纪温室世界期间，温度>20摄氏度的底层沃茨广泛形成。这些底层沃茨充满了北大西洋的海底，可能起源于热带海洋的温跃层或中层沃茨。在白垩纪海洋缺氧事件的碳埋藏产生了积极的三角洲C-13转移全球碳库，但这不是特别大，特别是与显着的晚古新世碳最大值相比。在白垩纪热温室期间，盆地间三角洲C-13梯度异常大，可能是因为北大西洋底床阻止了深盆地中沃茨的自由交换。当赤道大西洋门户打开到足以使南大洋形成的相对凉爽的极地沃茨淹没北大西洋深处时，炎热的温室效应结束了。
A new 55 m.y. global compilation of benthic foraminifera delta C-13 and delta O-18 for the middle to Late Cretaceous shows that there was widespread formation of bottom waters with temperatures >20 degrees C during the Cretaceous greenhouse world. These bottom waters filled the silled North Atlantic and probably originated as thermocline or intermediate waters in the tropical oceans. Carbon burial during the Cretaceous oceanic anoxic events produced a positive delta C-13 shift in global carbon reservoirs, but this is not particularly large, especially by comparison with the remarkable Late Paleocene carbon maximum. The interbasin delta C-13 gradient was unusually large during the Cretaceous hot greenhouse, probably because the North Atlantic sills prevented the free exchange of waters in the deep basin. The hot greenhouse ended when the Equatorial Atlantic Gateway opened sufficiently to flood the deep North Atlantic with relatively cool polar waters formed in the Southern Ocean.