Ocean circulation and the ice-temperature conundrum: Unraveling the transition from the Cretaceous greenhouse into today's icehouse world

海洋环流和冰温难题：揭示从白垩纪温室到当今冰库世界的转变

• 批准号: 139920741
• 负责人: Professor Dr. Oliver Friedrich
• 金额: --
• 依托单位: Institut für Geowissenschaften
• 依托单位国家: 德国
• 项目类别: Independent Junior Research Groups
• 财政年份: 2009
• 资助国家: 德国
• 起止时间: 2008-12-31 至 2015-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/139920741?language=en
• 关键词: Ocean; circulation; ice; temperature; conundrum

The overall goal of this proposal is to reconstruct temperature and ice-volume changes and their effects on ocean circulation and marine ecosystems for specific time intervals of the past 100 Ma that are particularly critical for our understanding of the Earth’s paleoclimatic dynamics. To tackle controversially discussed paleoclimatic and paleoceanographic issues, the proposed project will employ the novel carbonate “clumped-isotope” paleothermometer (CCIP), a new paleo-oxygenation proxy based on benthic foraminiferal pore characteristics (BFPC), and foraminiferal assemblage data. The overall project goals will be achieved following a threestage approach that comprises (I) testing of CCIP and BFPC, (II) the calibration of both proxies for selected foraminiferal taxa, and (III) their employment in studies on selected time slices of the Ceno- and Mesozoic. Stage (III) will comprise seven case studies where CCIP and BFPC analyses will be combined with “classical” proxies (e.g., δ18O, Mg/Ca, and assemblage counts). This integrated approach will allow to separate temperature from ice/salinity signals and to decipher the respective effects on ocean circulation and ecosystems, which will yield new insights into controversially discussed paleoclimatic and paleoceanographic processes. The proposed research can ultimately provide a significant step forward towards resolving the icetemperature conundrum for the Cretaceous greenhouse to the present-day’s icehouse world.

该提案的总体目标是重建温度和冰卷的变化及其对过去100 mA的特定时间间隔的海洋循环和海洋生态系统的影响，这对于我们对地球古气候动态的理解尤其重要。为了解决有争议的古气候和古病学问题，该拟议的项目将采用新型的碳酸盐“结块 - 同位素”的古热量计（CCIP），这是一种基于基于底栖有孔虫孔特征（BFPC）的新的古氧化代理（BFPC），以及有孔虫的组装组装数据。通过（I）测试CCIP和BFPC测试，（ii）对选定有孔虫分类单元的两个代理进行校准，以及（iii）在CENO和中生中学的选定时间段研究中，将实现总体项目目标。阶段（III）将完成七个案例研究，其中CCIP和BFPC分析将与“经典”代理（例如Δ18O，mg/ca和组合计数）结合使用。这种综合方法将允许将温度与冰/盐度信号分开，并破译对海洋循环和生态系统的影响，这将产生对有争议的古气候和古生物学过程的新见解。拟议的研究最终可以为解决当今的冰屋世界的白垩纪温室的冰淇淋难题提供重要的一步。

项目成果

Episodes of intensified biological productivity in the subtropical Atlantic Ocean during the termination of the Middle Eocene Climatic Optimum (MECO)

• DOI: 10.1002/2014pa002673
• 发表时间: 2015-08
• 期刊: Paleoceanography
• 作者: I. Moebius;O. Friedrich;K. Edgar;P. Sexton

AUTOMATED AND MANUAL ANALYSES OF THE PORE DENSITY-TO-OXYGEN RELATIONSHIP IN GLOBOBULIMINA TURGIDA (BAILEY)

• DOI: 10.2113/gsjfr.44.1.5
• 发表时间: 2014-01-01
• 期刊: JOURNAL OF FORAMINIFERAL RESEARCH
• 影响因子: 1.1
• 作者: Kuhnt, Tanja;Schiebel, Ralf;Friedrich, Oliver
• 通讯作者: Friedrich, Oliver

Empirical calibration of the clumped isotope paleothermometer using calcites of various origins

• DOI: 10.1016/j.gca.2014.06.004
• 发表时间: 2014-09
• 期刊: Geochimica et Cosmochimica Acta
• 影响因子: 5
• 作者: U. Wacker;J. Fiebig;J. Tödter;B. Schöne;A. Bahr;O. Friedrich;T. Tütken;E. Gischler;M. Joachimski

Campanian-Maastrichtian ocean circulation in the tropical Pacific

• DOI: 10.1002/palo.20051
• 发表时间: 2013-09-01
• 期刊: PALEOCEANOGRAPHY
• 作者: Jung, Claudia;Voigt, Silke;Frank, Martin
• 通讯作者: Frank, Martin

Campanian‐Maastrichtian intermediate‐ to deep‐water changes in the high latitudes: Benthic foraminiferal evidence

高纬度地区坎帕尼亚-马斯特里赫特中级到深水的变化：底栖有孔虫证据

• DOI: 10.1029/2011pa002259
• 发表时间: 2012
• 期刊: Paleoceanography
• 作者: Friedrich