Abstract Planktonic foraminifera represent a major component of global marine carbonate production, and understanding environmental influences on their calcification is critical to predicting marine carbon cycle responses to modern climate change. The present study investigated the effects of different environmental influences on calcification of the planktonic foraminifer Pulleniatina obliquiloculata. By correcting the dissolution effect on the size-normalized weight (SNW) of P. obliquiloculata from deep-sea sediments, we provide a means of estimating initial size-normalized weight (ISNW) from which to assess secular changes in the degree of calcification of P. obliquiloculata. Core-top ISNW in P. obliquiloculata from the global tropical oceans is significantly positively correlated with calcification temperature, suggesting that temperature is the dominant control on calcification. Using Neogloboquadrina dutertrei SNW as an independent deep-water Δ[CO32−] proxy, we present an ISNW record for P. obliquiloculata from the western tropical Pacific since 250 ka. The response of ISNW to past seawater temperature variations further confirms the dominant influence of temperature on P. obliquiloculata calcification. A potential increase in calcification as a result of ocean warming may have reduced oceanic uptake of CO2 from the atmosphere and increased atmospheric pCO2, generating a positive feedback for global warming.

中文翻译：

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受海水温度而不是海洋酸化控制的浮游有孔虫Plleniatina biquiloculata的钙化

摘要 浮游有孔虫是全球海洋碳酸盐生产的主要组成部分，了解环境对其钙化的影响对于预测海洋碳循环对现代气候变化的响应至关重要。本研究调查了不同环境影响对浮游有孔虫 Pulleniatinaobliquiloculata 钙化的影响。通过修正深海沉积物中斜纹石斑鱼的尺寸归一化重量 (SNW) 的溶解效应，我们提供了一种估算初始尺寸归一化重量 (ISNW) 的方法，从中可以评估钙化程度的长期变化。 P.obliquiloculata。来自全球热带海洋的 P.obliquiloculata 的核心顶部 ISNW 与钙化温度显着正相关，表明温度是钙化的主要控制因素。使用 Neogloboquadrina dutertrei SNW 作为独立的深水 Δ[CO32−] 代理，我们展示了自 250 ka 以来来自西热带太平洋的 P.obliquiloculata 的 ISNW 记录。ISNW 对过去海水温度变化的响应进一步证实了温度对 P.obliquiloculata 钙化的主要影响。海洋变暖导致钙化的潜在增加可能减少了海洋从大气中吸收的 CO2 并增加了大气 pCO2，从而对全球变暖产生了正反馈。ISNW 对过去海水温度变化的响应进一步证实了温度对 P.obliquiloculata 钙化的主要影响。海洋变暖导致钙化的潜在增加可能减少了海洋从大气中吸收的 CO2 并增加了大气 pCO2，从而对全球变暖产生了正反馈。ISNW 对过去海水温度变化的响应进一步证实了温度对 P.obliquiloculata 钙化的主要影响。海洋变暖导致钙化的潜在增加可能减少了海洋从大气中吸收的 CO2 并增加了大气 pCO2，从而对全球变暖产生了正反馈。