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首页> 外文期刊>Paleoceanography >Deep Atlantic Carbonate Ion and CaCO3 Compensation During the Ice Ages
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Deep Atlantic Carbonate Ion and CaCO3 Compensation During the Ice Ages

机译：深度大西洋碳酸盐离子和CaCO3在冰时代补偿

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摘要

Higher alkalinity compensates for reduced CaCO_3 burial in the deep ocean in response to increased carbon sequestration. This process could account for about half of the reduction in glacial atmospheric CO_2. To date, our understanding of this process comes from benthic carbon isotope and CaCO_3 burial records. Here we present a 1.5 Myr orbitally resolved deep ocean calcite saturation record (ΔCO_3~(2-)) derived from benthic foraminiferal B/Ca ratios in the North Atlantic. Glacial ΔCO_3~(2-) declines across the mid-Pleistocene transition suggesting increased sequestration of carbon in the deep Atlantic. The magnitude, timing, and structure of deep Atlantic Ocean ΔCO_3~(2-) parallel changes in %CaCO_3 and contrasts with the small amplitude, anti phased swings in Indo-Pacific ΔCO_3~(2-) and %CaCO_3 during the mid-to-late Pleistocene questioning the classic view of CaCO_3 compensatory mechanism. We propose that the increasing corrosivity of the deep Atlantic causes the locus of CaCO_3 burial to shift into the equatorial Pacific where the flux of CaCO_3 to the seafloor was sufficiently high to overcome low saturation and establish a new burial "hot spot." Based on this mechanism, we propose that the persistently lowΔCO_3~(2-) levels at marine isotope stage 12 set the stage for the high pCO_2 levels at marine isotope stage 11 and subsequent interglacials via large swings in ocean alkalinity caused by shifts in CaCO_3 burial. Similarly, the development of classic ("anticorrelated") CaCO_3 patterns was driven by enhanced ocean stratification and an increase in deep ocean corrosivity in response to mid-Pleistocene transition cooling.
机译：较高的碱度补偿了在深海中埋葬的降低的Caco_3，以响应增加的碳封存。该过程可以占冰川大气压级CO_2减少的约一半。迄今为止，我们对此过程的理解来自底栖碳同位素和Caco_3埋葬记录。在这里，我们提出了北大西洋北大西洋的底栖特征B / CA比衍生的1.5毫氏MYR甘蓝核心核心态核饱和度记录（ΔCO_3〜（2-））。冰川ΔCO_3〜（2-）在中间胞外转型中下降，表明碳深层大西洋中的碳依赖性增加。深度大西洋ΔCO_3〜（2-）在％Caco_3中平行变化的幅度，时序和结构，并与小幅度的小幅度对比，抗相位ΔCO_3〜（2-）和中间的％Caco_3中的抗相位摇摆。 -Late Pleistocene质疑Caco_3补偿机制的经典视图。我们提出深层大西洋的越来越大的腐蚀性导致Caco_3埋葬的轨迹转向赤道太平洋，其中Caco_3到海底的通量足够高，以克服低饱和度并建立一个新的埋葬“热点”。基于这种机制，我们提出了海洋同位素第12阶段的持续低温ΔCO_3〜（2-）水平在海洋同位素第11阶段11和随后通过Caco_3埋葬的变化引起的大摇摆，在海洋同位素第11阶段11和随后的中间尖端中的高pCO_2水平设定了阶段。 。同样，经典的发展（“逆相关”）Caco_3模式是通过增强的海洋分层驱动的驱动，并响应中间烯烯过渡冷却而增加深海腐蚀性。

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