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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Boron isotope-based seasonal paleo-pH reconstruction for the Southeast Atlantic - A multispecies approach using habitat preference of planktonic foraminifera
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Boron isotope-based seasonal paleo-pH reconstruction for the Southeast Atlantic - A multispecies approach using habitat preference of planktonic foraminifera

机译：基于硼的同位素的季节性palo-pH重建，用于东南大西洋 - 一种利用浮游动物栖息地偏好的多数方法

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The boron isotopic composition of planktonic foraminiferal shell calcite (delta B-11(Cc)) provides valuable information on the pH of ambient water at the time of calcification. Hence, delta B-11(Cc) of fossil surfaced-welling planktonic foraminifera can be used to reconstruct ancient aqueous pCO(2) if information on a second carbonate system parameter, temperature and salinity is available. However, pH and pCO(2) of surface waters may vary seasonally, largely due to changes in temperature, DIC, and alkalinity. As also the shell fluxes of planktonic foraminifera show species-specific seasonal patterns that are linked to intra-annual changes in temperature, it is obvious that delta B-11(Cc) of a certain species reflects the pH and thus pCO(2) biased towards a specific time period within a year. This is important to consider for the interpretation of fossil delta B-11(Cc) records that may mirror seasonal pH signals. Here we present new Multi-Collector Inductively Coupled Mass Spectrometry (MC-ICPMS) delta B-11(Cc) coretop data for the planktonic foraminifera species Globigerina bulloides, Globigerinoides Tuber, Trilobatus sacculifer and Orbulina universa and compare them with delta B-11(borate) derived from seasonally resolved carbonate system parameters. We show that the inferred season-adjusted delta B-11(Cc)/delta B-11(borate) relationships are similar to existing calibrations and can be combined with published delta B-11(Cc) field and culture data to augment paleo-pH calibrations. To test the applicability of these calibrations, we used a core drilled on the Walvis Ridge in the Southeast Atlantic spanning the last 330,000 years to reconstruct changes in surface-water pCO(2). The reconstruction based on G. bulloides, which reflects the austral spring season, was shown to yield values that closely resemble the Vostok ice-core data indicating that surface-water pCO(2) was close to equilibrium with the atmosphere during the cooler spring season. In contrast, pCO(2) est
机译：浮游聚氨酯的硼同位素组成壳胶铁化合物（Delta B-11（CC））提供了有关钙化时的环境水pH的有价值的信息。因此，如果有关于第二碳酸盐系统参数，温度和盐度的信息，则可以使用化石表面良好良好的浮游氏菌氏菌氏菌氏菌氏菌属的FORMIFERα（2）。然而，表面水的pH和PCO（2）可能会季节性地变化，主要是由于温度，DIC和碱度的变化。也与浮游动物的壳势率表现出与年度温度内变化相关的物种特异性季节性图案，显然某些物种的Delta B-11（CC）反映了pCO和因此PCO（2）偏置在一年内的特定时间段内。这对于解释可能镜像pH信号的化石Delta B-11（CC）记录非常重要。在这里，我们提出了新的多收集器电感耦合质谱（MC-ICPMS）DERTA B-11（CC）CORETOP数据用于浮游动物的Foraminifera Globigerina Bowroides，Globigerinoides Tuber，Trilobatus Saculifer和奥尔巴纳大学，并与Delta B-11进行比较（硼酸盐来自季节性解析的碳酸盐系统参数。我们表明推断季节调整的ΔB-11（CC）/ΔB-11（硼酸盐）关系类似于现有校准，可以与已发表的Delta B-11（CC）场和文化数据组合到增强古 - pH校准。为了测试这些校准的适用性，我们使用了跨越东南大西洋的Walvis山脊上钻探的核心，跨越过去33万年来重建地表水PCO（2）的变化。基于G.Babroides的重建，反映了澳门春季，展示了与Vostok冰核数据相似的值，表明表面水PCO（2）接近凉爽春季期间的大气平衡。相比之下，PCO（2）EST

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