Japan-JSPS Fellowship: Milankovitch and Climate Change in the Cretaceous and Paleogene Period

INT-0220936 Cramer该奖项支持为期24个月的日本科学促进协会（JSPS）博士后奖学金本杰明·克莱默。他将与日本东北大学的Kunio Kaiho教授合作。他们将对Milankovitch和白垩纪和古近纪的气候变化进行研究。这一课题是当前古海洋学研究的一个主要焦点。这一时期长期气候变化的大多数特征都依赖于低分辨率记录，而这些记录很可能受到潜在轨道周期性混叠的影响。此外，气候和生物扰动的高分辨率研究缺乏一个背景下，评估如何气候响应日照强迫可能已经改变了在不同的事件或如何日照强迫可能已经影响了这些事件的结构。研究的主要目标是：1）为Cenomanian-Turonian，古近纪-第三纪和古新世-始新世过渡产生Milankovitch地层学，2）使用此地层学作为指导，在这些过渡期间的离散间隔中研究Milankovitch时间尺度上的气候变化。研究人员希望能够产生一个可靠的基于米兰科维奇的地层学，这将大大加强对所有三个边界的研究。了解气候代用记录和轨道强迫之间的关系是了解白垩纪和古近纪温室气候的关键一步，并将有助于了解影响这些气候的孤立扰动。该项目将为两国共同努力提供一个很好的机会。通过交流思想和技术，该项目将扩大我们的基础知识，促进国际理解与合作。研究人员计划在网上公布研究结果，并在科学会议上报告研究结果。

INT-0220936CramerThis award supports a twenty-four month Japan Society for the Promotion of Science (JSPS) Postdoctoral Fellowship for Benjamin Cramer. He will be collaborating with Professor Kunio Kaiho at Tohoku University in Japan. They will be undertaking research on Milankovitch and climate change in the Cretaceous and Paleogene period. This topic is a major focus of current research in paleoceanography. Most characterizations of long-term climate change in this time period rely on low-resolution records that are most likely compromised by aliasing of the underlying orbital cyclicity. In addition, high-resolution studies of climatic and biotic perturbations lack a context for evaluating how the climate response to insolation forcing may have changed during different events or how insolation forcing may have affected the structure of these events. The major objectives of the research are 1) to produce a Milankovitch stratigraphy for the Cenomanian-Turonian, Cretaceous-Tertiary, and Paleocene-Eocene transitions and 2) using this stratigraphy as a guide, to investigate climate changes on Milankovitch timescales in discreet intervals during these transitions. The researchers hope to produce a reliable Milankovitch-based stratigraphy that will greatly enhance studies of all three boundaries. Understanding the relationship between climate proxy records and orbital forcing is a crucial step in understanding Cretaceous and Paleogene greenhouse climates and will be useful in understanding isolated perturbations that affected those climates. This project will offer a good opportunity to join efforts between the two countries. Through the exchange of ideas and technology, this project will broaden our base of basic knowledge and promote international understanding and cooperation. The researchers plan to publish results of the research on the web and report on the findings at scientific meetings.