The role of atmospheric CO2 in the first great ice ages: insights from very high-resolution boron isotope records

大气二氧化碳在第一次大冰河时期的作用：来自极高分辨率硼同位素记录的见解

• 批准号: 2106366
• 金额: --
• 依托单位: University of Southampton
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2018
• 资助国家: 英国
• 起止时间: 2018 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2106366
• 关键词: role; atmospheric; CO2; first; great

The concentration of carbon dioxide (CO2) in the atmosphere is often said to be the "control knob" of Earth's climate. For instance, recent work at Southampton has confirmed that a decline in atmospheric CO2 played a key role in triggering the establishment of large Northern Hemisphere ice sheets 2.7 million years ago (Martinez-Boti et al., 2015; www.thefosterlab.org). On shorter timescales, ice core records have shown that CO2 also plays a crucial role in driving the well documented glacial-interglacial cycles of the past 2.7 million years (Quaternary Period) by amplifying the effects of small variations in solar radiation due to changes in Earth's orbit around the Sun. The exact processes involved and the sensitivity of the Earth to changes in CO2, however, remain key gaps in our understanding of the Earth system with clear relevance for our warm future (e.g. Martinez-Boti et al., 2015). In this project we will examine and use the initial glacial-interglacial cycles of the Quaternary, centered on Marine Isotope Stage 100 around 2.5 million years ago (Shakun et al., 2017), as a test-bed to address these fundamental knowledge gaps.

大气中二氧化碳(CO2)的浓度常被认为是地球气候的“控制钮”。例如，南安普顿最近的研究证实，大气二氧化碳的减少在270万年前触发北半球大冰盖的形成中发挥了关键作用(Martinez-Boti等人，2015年；www.thefosterLab.org)。在较短的时间尺度上，冰芯记录表明，二氧化碳还通过放大地球绕太阳轨道变化引起的太阳辐射微小变化的影响，在推动过去270万年(第四纪)有充分记载的冰川-间冰期周期方面发挥了关键作用。然而，地球对二氧化碳变化的确切过程和敏感性仍然是我们对地球系统的理解中的关键差距，与我们的温暖未来具有明显的相关性(例如，Martinez-Boti等人，2015年)。在这个项目中，我们将研究和使用第四纪的初始冰川-间冰期旋回，以大约250万年前的海洋同位素阶段100为中心(Shakun等人，2017年)，作为解决这些基本知识差距的试验台。