The accuracy of mid-Pliocene d18O-based ice volume and sea level reconstructions
The accuracy of mid-Pliocene d18O-based ice volume and sea level reconstructions
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基于 d18O 的上新世中期冰量和海平面重建的准确性
DOI：
10.1016/j.earscirev.2017.11.022
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发表时间：
2018
影响因子：
12.1
通讯作者：
Raymo M
中科院分区：
文献类型：
--
作者：
Raymo M
如果我们要准确预测未来的海平面变化，了解极地冰盖对温和的全球变暖（比工业化前高2-3°C）的敏感性是至关重要的，这些知识将为未来几年的社会和经济政策提供信息。然而，上新世（2.6-5.3 Ma）是地球近代史上一个以大气二氧化碳水平与今天相似为特征的时期，对上新世（2.6-5.3 Ma）进行了数十年的研究，迄今为止未能提供当时海平面和冰量的明确估计。本文回顾了用于估算过去海平面、冰量和海洋温度的配对Mg/Ca-δ18O方法的不确定性来源，并讨论了可能影响我们对海洋地球化学记录解释的常见假设，包括LR04底栖生物-δ18O堆积，这是一个由57个氧同位素记录组成的全球汇编，构成了过去530万年气候变化历史的标准模板。
Understanding the sensitivity of the polar ice caps to a modest global warming (2–3 °C above preindustrial) is of paramount importance if we are to accurately predict future sea level change, knowledge that will inform both social and economic policy in the coming years. However, decades of study of the Pliocene (2.6–5.3 Ma), an epoch in recent Earth history characterized by atmospheric CO2levels similar to today, have so far failed to provide definitive sea level and ice volume estimates for that time. Here we review the sources of uncertainty in the paired Mg/Ca-δ18O methodology used to estimate past sea level, ice volume, and ocean temperature, as well as discuss common assumptions that may bias our interpretation of ocean geochemical records including the LR04 benthic-δ18O stack, a global compilation of 57 oxygen isotope records that forms the standard template of climate change history for the last 5.3 million years.