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Ocean Carbon Storage across the middle Miocene: a new interpretation for the Monterey Event.
Nature Communications ( IF 14.7 ) Pub Date : 2020-01-09 , DOI: 10.1038/s41467-019-13792-0
S M Sosdian 1 , T L Babila 2 , R Greenop 3 , G L Foster 2 , C H Lear 1
Affiliation  

The Miocene Climatic Optimum (MCO, 14-17 Ma) was ~3-4 °C warmer than present, similar to estimates for 2100. Coincident with the MCO is the Monterey positive carbon isotope (δ13C) excursion, with oceans more depleted in 12C relative to 13C than any time in the past 50 Myrs. The long-standing Monterey Hypothesis uses this excursion to invoke massive marine organic carbon burial and draw-down of atmospheric CO2 as a cause for the subsequent Miocene Climate Transition and Antarctic glaciation. However, this hypothesis cannot explain the multi-Myr lag between the δ13C excursion and global cooling. We use planktic foraminiferal B/Ca, δ11B, δ13C, and Mg/Ca to reconstruct surface ocean carbonate chemistry and temperature. We propose that the MCO was associated with elevated oceanic dissolved inorganic carbon caused by volcanic degassing, global warming, and sea-level rise. A key negative feedback of this warm climate was the organic carbon burial on drowned continental shelves.

中文翻译:

中新世中期的海洋碳储存:蒙特利事件的新解释。

中新世最佳气候(MCO,14-17 Ma)比现在温暖约 3-4 °C,与 2100 年的估计相似。与 MCO 一致的是蒙特雷正碳同位素(δ13C)漂移,海洋在 12C 时更加贫化相对于 13C 的气温比过去 50 迈尔斯的任何时候都高。长期存在的蒙特利假说利用这种偏移来引发大规模的海洋有机碳埋藏和大气二氧化碳的减少,作为随后的中新世气候转变和南极冰川的原因。然而,这一假设无法解释 δ13C 偏移与全球变冷之间的多迈尔滞后。我们使用浮游有孔虫 B/Ca、δ11B、δ13C 和 Mg/Ca 来重建表面海洋碳酸盐化学和温度。我们认为,MCO 与火山脱气、全球变暖和海平面上升引起的海洋溶解无机碳升高有关。这种温暖气候的一个关键负面反馈是淹没大陆架上的有机碳埋藏。
更新日期:2020-01-09
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