Here we use volume density (ρ_V) measurements as a metric of size‐normalized weights for Neogloboquadrina pachyderma, a planktonic foraminifer, from upper OMZ and abyssal depth sites in the Gulf of Alaska over the past ∼20,000 years to test for covariation between carbonate preservation and OMZ intensity. We find that dissolution of N. pachyderma is most intense at the upper OMZ site where oxygenation is generally lower than at the abyssal site. We also examine Uvigerina peregrina, a benthic foraminifer, at the upper OMZ site and find that the lowest ρ_V measurements in both taxa occur during deglacial and early Holocene dysoxic events. We use computed tomography images to confirm that changes in ρ_V are related to shell thickness, observe dissolution features, and test for growth influences on ρ_V. Further, we use stepwise selection of multiple regression models in which coregistered environmental proxies are potential predictors of ρ_V and find that the best supported models retain negative associations between ρ_V and the concentration of redox‐sensitive metals and the relative abundance of dysoxia‐tolerant and opportunistic benthic foraminifera, indicating that low ρ_V is associated with low‐oxygen conditions and pulsed availability of organic matter at the seafloor. Taken together, our results suggest the primary driver of carbonate dissolution here is related to organic carbon respiration at the seafloor. This highlights the importance of metabolic dissolution in understanding the inorganic carbon cycle and the role regions with high‐organic carbon export, such as OMZs, can have as CO₂ sources as metabolic dissolution intensifies.

中文翻译：

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与北极副极冰河缺氧事件相关的碳酸盐溶解增强

在这里，我们使用体积密度（ρ _V）的测量作为度量大小归一化的权重Neogloboquadrina pachyderma，一个浮游有孔虫，从过去~20,000年在阿拉斯加湾上OMZ和深海深度位点以测试碳酸盐之间共变保存和OMZ强度。我们发现，在上部OMZ部位，厚皮猪笼草的溶解最强烈，那里的氧合程度通常比深渊部位低。我们还检查Uvigerina蝇，底栖有孔虫，在上OMZ网站，发现最低的ρ _V在冰期和全新世低氧事件早期都对两类生物进行测量。我们使用计算机断层扫描图像，以确保在变化ρ _V壳的厚度，观察溶解的特点有关系，并测试对经济增长的影响ρ _V。此外，我们使用该配准的环境指标是潜在的预测多元回归模型的逐步选择ρ _V，发现最好的支持的机型保留之间的负相关ρ _V和氧化还原敏感的金属的浓度和dysoxia容忍的相对丰度和机会底栖有孔虫，这表明低ρ _V与低氧条件和海底有机物的脉冲供应有关。综上所述，我们的结果表明，碳酸盐溶解的主要驱动力与海底有机碳的呼吸有关。这突显了代谢溶解在理解无机碳循环中的重要性，以及随着代谢溶解的加剧，具有高有机碳输出的区域（如OMZ）可能会作为CO ₂源发挥作用。