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A New biological proxy for deep-sea paleo-oxygen: Pores of epifaunal benthic foraminifera

机译:深海古氧的一种新的生物替代物:表生底栖有孔虫的孔

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摘要

The negative consequences of fossil fuel burning for the oceans will likely include warming, acidification and deoxygenation, yet predicting future deoxygenation is difficult. Sensitive proxies for oxygen concentrations in ancient deep-ocean bottom-waters are needed to learn from patterns of marine deoxygenation during global warming conditions in the geological past. Understanding of past oxygenation effects related to climate change will better inform us about future patterns of deoxygenation. Here we describe a new, quantitative biological proxy for determining ocean paleo-oxygen concentrations: the surface area of pores (used for gas exchange) in the tests of deep-sea benthic foraminifera collected alive from 22 locations (water depths: 400 to 4100 m) at oxygen levels ranging from ~ 2 to ~ 277 μmol/l. This new proxy is based on species that are widely distributed geographically, bathymetrically and chronologically, and therefore should have broad applications. Our calibration demonstrates a strong, negative logarithmic correlation between bottom-water oxygen concentrations and pore surface area, indicating that pore surface area of fossil epifaunal benthic foraminifera can be used to reconstruct past changes in deep ocean oxygen and redox levels.
机译:化石燃料燃烧对海洋的负面影响可能包括变暖,酸化和脱氧,但很难预测未来的脱氧。要从地质过去的全球变暖条件下的海洋脱氧模式中学习,就需要对古代深海底水中氧气浓度的敏感代理。了解过去与气候变化有关的氧合作用将更好地为我们提供有关未来脱氧模式的信息。在这里,我们描述了一种用于确定海洋古氧气浓度的新的定量生物学替代物:从22个位置(水深:400至4100 m)活着收集的深海底栖有孔虫的测试中的孔表面积(用于气体交换) )的氧气浓度范围为〜2至〜277μmol/ l。该新代理基于在地理,测深和时间上广泛分布的物种,因此应具有广泛的应用。我们的校准表明,底部水的氧气浓度与孔隙表面积之间存在强的负对数相关性,表明化石表生底栖有孔虫的孔隙表面积可用于重构深海氧气和氧化还原水平的过去变化。

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