Calcification of planktonic foraminifer Pulleniatina obliquiloculata controlled by seawater temperature rather than ocean acidification
Calcification of planktonic foraminifer Pulleniatina obliquiloculata controlled by seawater temperature rather than ocean acidification
复制标题
浮游有孔虫 Pulleniatina obliquiloculata 的钙化受海水温度而非海洋酸化控制
DOI：
10.1016/j.gloplacha.2020.103256
复制
发表时间：
2020
影响因子：
3.9
通讯作者：
Qi Jia
中科院分区：
文献类型：
--
作者：
Bingbin Qin;Tiegang Li;Zhifang Xiong;Thomas J. Algeo;Qi Jia
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。研究了不同环境因素对圆斑普列虫（Pulleniatina acidiloculata）钙化的影响。通过校正溶解效应对P.从深海沉积物中，我们提供了一种方法来估计初始尺寸归一化重量（ISNW），以评估长期变化的钙化程度ofP。有眼的核心顶部ISNW inP.全球热带海洋中的珊瑚礁与钙化温度呈显著正相关，表明温度是控制钙化的主要因素。利用Neogloboquadrina dutertreiSNW作为一个独立的深水Δ[CO32−]代用指标，我们给出了P的ISNW记录。250ka以来热带西太平洋的古珊瑚化石。ISNW对过去海水温度变化的响应进一步证实了温度对P的主导影响。微囊钙化由于海洋变暖而导致的钙化的潜在增加可能减少了海洋从大气中吸收的CO2，并增加了大气中的pCO2，从而对全球变暖产生了积极的反馈。
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 foraminiferPulleniatina obliquiloculata. By correcting the dissolution effect on the size-normalized weight (SNW) ofP. obliquiloculatafrom 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 ofP. obliquiloculata. Core-top ISNW inP. obliquiloculatafrom the global tropical oceans is significantly positively correlated with calcification temperature, suggesting that temperature is the dominant control on calcification. UsingNeogloboquadrina dutertreiSNW as an independent deep-water Δ[CO32−] proxy, we present an ISNW record forP. obliquiloculatafrom the western tropical Pacific since 250 ka. The response of ISNW to past seawater temperature variations further confirms the dominant influence of temperature onP. obliquiloculatacalcification. A potential increase in calcification as a result of ocean warming may have reduced oceanic uptake of CO2from the atmosphere and increased atmosphericpCO2, generating a positive feedback for global warming.