The Late Miocene Climate Enigma: Insights from Expedition 363

中新世晚期气候之谜：第 363 次探险的见解

• 批准号: NE/P016456/1
• 负责人: Caroline Lear
• 金额: $ 3.21万
• 依托单位: CARDIFF UNIVERSITY
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2017
• 资助国家: 英国
• 起止时间: 2017 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=NE%2FP016456%2F1
• 关键词: Late; Miocene; Climate; Enigma; Insights

2016 has been a record breaking year in terms of global temperatures. The high temperatures have resulted from a combination of elevated atmospheric pCO2 coupled with the global impacts of a strong El Nino event. There are many important components of the climate system, and the El Nino phenomenon demonstrates the importance of the low latitude Pacific Ocean. The warm pool of water in the western Pacific Ocean has not always had the same characteristics as it has today, and it has been proposed that its evolution over the past 15 million years has had a major impact on global climate. In order to understand how the warm pool might respond to future climate change, it is important to understand the drivers behind its past evolution. Did it respond simply to the changing shape of ocean basins through time? Or did it respond to other components of the climate system, such as sea level or latitudinal temperature gradients? The changes in warm pool structure may also have impacted the biological ecosystems, and hence the cycling of carbon in this region. The carbon cycle is another key component of the Earth's climate system. Understanding the causes and consequences of these long-term changes in the Pacific warm pool requires a two-pronged approach, using modelling in conjunction with proxy records for different parts of the climate system. This proposal aims to generate some key records of past high latitude temperature and ice volume that can be directly compared with changes in the warm pool through time. These records will be derived from geochemical analyses of microscopic marine fossils collected by the International Ocean Discovery Program (IODP).

就全球温度而言，2016年是创纪录的一年。高温是由升高的大气PCO2以及强烈的El Nino事件的全球影响而产生的。气候系统有许多重要的组成部分，而El Nino现象表明了低纬度太平洋的重要性。西太平洋中温暖的水池并不总是与今天相同的特征，并且有人提出，在过去的1500万年中，其发展对全球气候产生了重大影响。为了了解温暖的池可能如何应对未来的气候变化，重要的是要了解其过去演变背后的驱动因素。随着时间的流逝，它只是对海盆变化的变化做出了反应？还是对气候系统的其他组件（例如海平面或纬度温度梯度）有反应？温暖池结构的变化也可能影响了生物生态系统，因此在该地区的碳循环。碳循环是地球气候系统的另一个关键组成部分。了解太平洋温暖池中这些长期变化的原因和后果需要两种约束的方法，并结合建模与气候系统不同部分的代理记录结合使用。该提案旨在产生一些过去的高纬度温度和冰量的关键记录，这些记录可以直接与随着时间的时间变化进行比较。这些记录将来自国际海洋发现计划（IODP）收集的微观海洋化石的地球化学分析。