A new high-resolution stratigraphic record of the Paleocene-Eocene Thermal Maximum in the Eastern Tethys

发生在古新世-始新世热极大期（PETM; 5600万年前）的突然全球变暖事件被认为是未来全球气候变化的极好模拟。这一事件伴随着全球气温突然上升5至9摄氏度（9至16华氏度），同时沿着大量二氧化碳释放到大气中的迹象。该项目将完善保存在古特提斯海沉积物中的这一事件的地层记录，作为该区域这一时期温度变化的代用记录。这项研究将使用超微化石生物年代学和高分辨率磁化率来开始解开该地区的地质历史，并研究使用最先进的地球化学古温度计来量化温度变化的潜力。 在这样做的过程中，研究将评估特提斯海在全球气候模式中的重要性，以及在这个更温暖的气候状态下大气二氧化碳快速变化的作用。该项目还将为来自经济困难背景的本科生提供支持。学生将从美国化学学会的项目种子（夏季经验的经济困难）和GS-LSAMP（花园州路易斯斯托克斯少数民族参与联盟）招募。 研究结果将在公开活动中公布，并通过NOAA古气候数据库和MagIC数据库向更广泛的古气候界提供数据。具体而言，本项目的研究目标是：（1）进一步发展古地中海东部在PETM期间温度上升的速度和时间的地层记录，（2）利用岩石磁性旋回地层学估算沉积速率;（3）评价利用甘油二烷基甘油四醚分布重建海面温度的可行性。这些数据将评估东特提斯在调节全球温度和湿度变化方面的潜在重要性，以及在PETM期间大气CO2强迫的大而快速变化的作用。这些信息可以帮助记录古气候记录，这将改变我们对PETM驱动因素的理解，并为地球系统如何应对当前大气CO2增加提供有用的见解，并更普遍地提供全球气候模型中关键参数的见解。该奖项反映了NSF的法定使命，并被认为值得通过使用基金会的智力价值和更广泛的评估来支持。影响审查标准。

An abrupt global warming event that occurred at the Paleocene-Eocene Thermal Maximum (or PETM; 56 million years ago) is considered an excellent analogue for future global climate change. This event is accompanied by an abrupt 5 to 9 degrees Celsius (9 to 16 degrees Fahrenheit) global temperature rise along with indications of large quantities of carbon dioxide released into the atmosphere. This project will refine the stratigraphic record of this event as preserved in deposits of the ancient Tethys sea for proxy records of temperature change during this interval in this region. The research will use nannofossil biochronology and high-resolution magnetic susceptibility to begin to unravel the geological history of the region and examine the potential to use a state-of-the art geochemical paleothermometer to quantify temperature change. In doing so, the research will evaluate the importance of the Tethys sea in global climate patterns as well as the role of rapid changes in atmospheric carbon dioxide in this much warmer climate state. The project will also provide support for undergraduate students from economically disadvantaged backgrounds. Students will be recruited from the American Chemical Society’s project SEED (Summer Experiences for the Economically Disadvantaged) and GS-LSAMP (the Garden State Louis Stokes Alliance for Minority Participation). The results of the research will be presented in public events and the data made available to the broader paleoclimate community through the NOAA Paleoclimate database and MagIC database.Specifically, the research goals of this project are to (1) further develop the stratigraphic record of the pace and timing of temperature increase in the eastern Tethys sea during the PETM , (2) use rock magnetic cyclostratigraphy to estimate the sedimentation rate, and (3) evaluate the feasibility of applying the distributions of glycerol dialkyl glycerol tetraethers to reconstruct sea surface temperatures. These data will evaluate the potential importance of the eastern Tethys in regulating global temperature and moisture changes, as well as the role of large and rapid changes in atmospheric CO2 forcing during the PETM. This information could help document a paleoclimate record that will transform our understanding of the drivers of the PETM and offer useful insight into how the Earth system will respond to current increases in atmospheric CO2 and more generally provide insight into key parameters in global climate models.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.