Clumped isotope thermometry and oxygen isotope composition of seawater of key climate events during the Oligocene
渐新世关键气候事件海水的丛同位素测温和氧同位素组成
基本信息
- 批准号:428605926
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:德国
- 项目类别:Infrastructure Priority Programmes
- 财政年份:2019
- 资助国家:德国
- 起止时间:2018-12-31 至 2022-12-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Understanding past climate changes and their underlying causes requires reconstructions of past ocean composition and temperatures. However, traditional proxies of ocean temperatures and ice volume (e.g., stabile oxygen isotopes and Mg/Ca values of foraminifera) are undermined by biological processes or changes in ocean chemistry. Clumped isotope thermometry, a promising, novel proxy, circumvents these problems. Carbonate clumped isotope thermometry is entirely thermodynamically based and therefore provides temperature estimates independent of the original isotopic or chemical composition of the source water, in contrast to other carbonate temperature proxies (oxygen isotopes and Mg/Ca ratios). Paired oxygen-clumped isotope measurements on carbonate samples thus enable the calculation of the oxygen isotope composition of the water, from which the carbonates precipitated. That means, clumped isotope thermometry also provides insights into global ice volume changes. The clumped isotope method used here allows measurement of small sample sizes and has an analytical error as small as +/-1-2°C, which is comparable to other temperature proxies. The Oligocene is an important climate epoch as it marks the inception of the icehouse world following the warm greenhouse climate of the Palaeocene and Eocene. The onset of the Oligocene is one of the most fundamental reorganisations of global climate, as the first permanent, large continental ice sheets formed on Antarctica. However, a recent study using clumped isotopes across the Eocene-Oligocene transition (EOT) at a Southern Ocean site indicates no evident temperature change across this ice growth event. This unexpected lack of temperature change could arise from uncertainties in the clumped isotope-T calibration at low temperatures. Therefore, this proposed study aims to establish a clumped isotope-T calibration of modern surface-, thermocline-dwelling and benthic foraminifera of high latitude Southern Ocean sites to improve published clumped isotope calibration equations on the low-temperature end. Finally, this study will reconstruct reliable bottom and surface seawater temperatures, using paired measurements of foraminiferal clumped isotope values and Mg/Ca ratios, at sites spanning different latitudes and ocean basins. These analyses will target specific time intervals of the Oligocene, such as the EOT (to reassess the findings of the Southern Ocean study) and key glaciation phases (Oi-2b, Mi-1). The Oi-2b glaciation occurred during maximum ice volume of the entire Oligocene. During the Mi-1 glaciation, benthic foraminiferal oxygen isotope records illustrate an increase similar to the EOT interval, raising the question of comparable estimates of ice growth. In summary, investigating these intervals will evaluate the seawater temperatures, seawater oxygen isotope composition and global ice volume changes during a time when global climate was mainly driven by Southern Hemisphere climate mechanisms.
了解过去的气候变化及其根本原因需要重建过去的海洋组成和温度。然而,传统的海洋温度和冰量的替代指标(例如,有孔虫的稳定氧同位素和Mg/Ca值)受到生物过程或海洋化学变化的破坏。集束同位素测温法,一个有前途的,新颖的代理,规避这些问题。与其他碳酸盐温度代用指标(氧同位素和Mg/Ca比)相比,碳酸盐聚集同位素温度测定法完全基于同位素,因此提供独立于源水的原始同位素或化学成分的温度估计。因此,对碳酸盐样品进行成对的氧聚簇同位素测量,可以计算出碳酸盐沉淀的水的氧同位素组成。这意味着,聚集同位素测温法还可以深入了解全球冰量的变化。这里使用的聚集同位素方法允许测量小样本量,并且具有小至+/-1-2°C的分析误差,这与其他温度代理相当。渐新世是一个重要的气候时代,因为它标志着继古新世和始新世温暖的温室气候之后冰库世界的开始。渐新世的开始是全球气候最根本的重组之一,因为第一个永久性的大型大陆冰盖在南极洲形成。然而,最近在南大洋的一个地点使用始新世-渐新世过渡(EOT)的聚集同位素进行的一项研究表明,在这一冰生长事件中没有明显的温度变化。这种意外的缺乏温度变化可能是由于低温下凝聚同位素T校准的不确定性造成的。因此,这项拟议的研究旨在建立一个集群同位素T校准现代表面,温跃层居住和底栖有孔虫的高纬度南大洋网站,以改善公布的集群同位素校准方程的低温端。最后,这项研究将重建可靠的底部和表面海水温度,使用配对测量有孔虫聚集的同位素值和Mg/Ca比值,在不同纬度和海洋盆地的网站。这些分析将针对渐新世的特定时间间隔,例如EOT(重新评估南大洋研究的结果)和关键冰川期(Oi-2b,Mi-1)。Oi-2b冰期发生在整个渐新世最大冰量时期。在Mi-1冰川期,底栖有孔虫氧同位素记录显示了类似于EOT间隔的增加,提出了冰增长的可比估计的问题。总之,调查这些时间间隔将评估海水温度,海水氧同位素组成和全球冰量的变化,在全球气候主要由南半球气候机制驱动的时候。
项目成果
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Professor Dr. Heiko Pälike, Ph.D.其他文献
Professor Dr. Heiko Pälike, Ph.D.的其他文献
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{{ truncateString('Professor Dr. Heiko Pälike, Ph.D.', 18)}}的其他基金
Closing the mid-Eocene palaeoceanography and time scale gap and testing Eocene climate hypotheses with material and data from IODP Expedition 342 (Newfoundland)
缩小始新世中期古海洋学和时间尺度差距,并利用 IODP 342 号探险队(纽芬兰)的材料和数据测试始新世气候假设
- 批准号:
242254604 - 财政年份:2013
- 资助金额:
-- - 项目类别:
Infrastructure Priority Programmes
An open access platform to document and retrieve composite records from ocean drilling sites - the Ocean Drilling Composite Tracker (ODCT)
用于记录和检索海洋钻探现场综合记录的开放式访问平台 - 海洋钻探综合跟踪器 (ODCT)
- 批准号:
506530658 - 财政年份:
- 资助金额:
-- - 项目类别:
Infrastructure Priority Programmes
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