Investigating interspecies correction factors and extending the applicability of benthic foraminiferal oxygen isotopes studies
研究种间校正因子并扩展底栖有孔虫氧同位素研究的适用性
基本信息
- 批准号:269869248
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:德国
- 项目类别:Research Grants
- 财政年份:2014
- 资助国家:德国
- 起止时间:2013-12-31 至 2015-12-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The oxygen isotopic composition of benthic foraminiferal shells is one of the fundamental tracers to decipher global variations in ice volume and past changes in the temperature and salinity of oceanic water masses. Despite its use as a paleoceanographic proxy for several decades, there is still considerable debate concerning the temperature dependence of benthic foraminiferal oxygen isotopes and the constancy of offsets between coexisting species. The main objectives of this project are: (1) to evaluate interspecies oxygen isotopic offsets in ten benthic foraminifers that commonly occur in intermediate- to deep-water masses, (2) to test the hypothesis of a significant influence of pH/carbonate ion concentration on the isotopic composition of infaunal foraminiferal tests and (3) to provide constraints for interspecific oxygen isotope calibrations in order to extend the applicability of composite benthic records over the Holocene to Neogene periods. Our core top calibrations will target the tropical Indo-Pacific region, which has so far been sparsely investigated and offers the opportunity to test carbonate ion effects over a wide range of bottom and pore water concentrations, using a consistent methodology. We will contrast these records with new calibration data from the eastern North Atlantic Margin, characterized by well-ventilated bottom water masses and pore waters with reduced carbonate ion concentrations. Finally, we will integrate our findings with published data from other oceanic settings to further explore the range of regional variability in interspecies oxygen isotopic offsets.
底栖有孔虫贝壳的氧同位素组成是破译全球冰量变化以及过去海洋水团温度和盐度变化的基本示踪剂之一。尽管它作为古海洋学指标已经使用了几十年,但关于底栖有孔虫氧同位素的温度依赖性以及共存物种之间的偏移量是否恒定,仍存在相当大的争议。该项目的主要目标是:(1)评估中-深水团常见的10种底栖有孔虫的种间氧同位素偏移量,(2)检验pH/碳酸盐离子浓度对海底有孔虫同位素组成有显著影响的假说,以及(3)为种间氧同位素定标提供约束,以扩大全新世至新近纪复合海底记录的适用性。我们的岩心顶部校准将以热带印度-太平洋地区为目标,到目前为止,该地区的调查一直很少,并提供了使用一致的方法在广泛的底水和孔隙水浓度范围内测试碳酸盐离子影响的机会。我们将把这些记录与来自北大西洋东部边缘的新校准数据进行对比,该边缘以通风良好的底层水团和碳酸盐离子浓度降低的孔隙水为特征。最后,我们将把我们的发现与其他海洋环境中公布的数据结合起来,进一步探索物种间氧同位素偏移量的区域变异性范围。
项目成果
期刊论文数量(0)
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Dr. Ann Holbourn其他文献
Dr. Ann Holbourn的其他文献
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{{ truncateString('Dr. Ann Holbourn', 18)}}的其他基金
Impact of Western Pacific Warm Pool variability on regional and global climate evolution during the late Miocene and early Pliocene
中新世晚期和上新世早期西太平洋暖池变率对区域和全球气候演变的影响
- 批准号:
387857866 - 财政年份:2017
- 资助金额:
-- - 项目类别:
Infrastructure Priority Programmes
Developing an early to middle Miocene benthic foraminiferal isotope chronostratigraphy across the Pacific "paleoequator transect" (IODP PEAT Expedition 320/321)
开发跨太平洋“古赤道样带”早中新世底栖有孔虫同位素年代地层学(IODP PEAT Expedition 320/321)
- 批准号:
142157224 - 财政年份:2009
- 资助金额:
-- - 项目类别:
Infrastructure Priority Programmes
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