Earth's Climate History, Ice Sheets, and Sea Level Over Last Four Million Years

过去四百万年地球的气候历史、冰原和海平面

• 批准号: 1238405
• 负责人: Maureen Raymo
• 金额: $ 13.73万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-08-15 至 2012-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1238405&HistoricalAwards=false
• 关键词: Earth; Climate; History; Ice; Sheets

The maximum elevation of the mid-Pliocene sea level is a fundamental question in the climate community. In this ABR the PI will investigate the mid-Pliocene climatic optimum and Antarctic ice volume history. This period is the last time in Earth's history when the climate was consistently warmer than the Holocene (by as much as 3 degrees above present) and CO2 levels on the order of 350-370 ppm (less than today). The sea-level change associated with this optimum are only a point of conjecture. The PI has set three tasks for herself: 1) Collect all published geological/geochemical studies of the Pliocene and write a review paper; 2) Develop a Wiki site that aims to educate students and scientists about this largely unresolved climate problem; 3) A lab based study using the Mg/Ca thermometry to isolate temperature and ocean isotopic compositional changes in a deep sea delta O18 record fro ODP site 625. Broader impacts of the study include the development of a Wiki site for the Pliocene which could be a model for such future sites for other geological topics as well. It is hoped that the site will serve to promote research among the global community of Earth scientists. It could enhance partnerships among scientists from less developed countries through on-line sharing of data and information.

上新世中期海平面的最高海拔是气候学界的一个基本问题。在这次ABR中，PI将研究上新世中期的气候最佳和南极冰量历史。这是地球历史上最后一次气候持续高于全新世(比现在高出3摄氏度)，二氧化碳水平在350-370ppm左右(比今天低)。与这种最佳状态相关的海平面变化只是猜测而已。PI为自己设定了三项任务：1)收集所有已发表的关于上新世的地质/地球化学研究，并撰写一篇综述论文；2)开发一个维基网站，旨在教育学生和科学家关于这个基本上尚未解决的气候问题；3)一项基于实验室的研究，使用镁/钙测温仪分离深海三角洲O18记录的温度和海洋同位素组成变化。这项研究的更广泛影响包括为上新世开发了一个维基网站，这可能也是其他地质主题未来此类网站的典范。希望该网站将有助于促进全球地球科学家社区的研究。它可以通过在线共享数据和信息来加强欠发达国家科学家之间的伙伴关系。