Cenzoic Paleoceanographic and Climate Development of the Antarctic Region Based on Oceanic Sediment Sequences

基于海洋沉积序列的南极地区新生代古海洋学和气候发展

• 批准号: 9218720
• 负责人: James Kennett
• 金额: $ 28.5万
• 依托单位: University of California-Santa Barbara
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-02-15 至 1997-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9218720&HistoricalAwards=false
• 关键词: Cenzoic; Paleoceanographic; Climate; Development; Antarctic

This award supports a continuing investigation of the oxygen and carbon isotopic composition and biostratigraphy of marine sedimentary sequences from the circum-Antarctic oceans. These studies are aimed at reconstructing the paleoclimatic, paleoceanographic, and biotic evolution of the Antarctic region during the Cenozoic. Oceanographic and climatic evolution since the middle Eocene (the last 52 million years) consists largely of progressive cooling and glaciation of the polar regions and perhaps warming in the tropics. The climatic and glacial evolution of polar regions, including Antarctica, is crucial to our understanding of long term global climatic change because high latitudes are among the most sensitive regions to externally driven change. Strong feedback mechanisms involving ice albedo and bottom water formation contribute to the development of polar regions. The Cenozoic marine stratigraphic record is largely the product of this climate evolution at high latitudes and hence it is crucial to have the most complete record possible. This investigation will add to the record of proxy climate and environmental indicators by using existing Ocean Drilling Program (ODP) cores. For the Paleogene (Paleocene through Oligocene), work will focus on cores from ODP Legs 113, 119, and 120. For the Neogene (Oligocene through present), work will focus on ODP cores from low and middle latitudes in the southwest and equatorial Pacific. This work will contribute significantly to a general understanding of the role of polar regions in global climatic change. In addition, this work will contribute to our understanding of the significance of the Circum-Antarctic Current in Antarctic and global climate processes. This work is particularly relevant in addressing the important question about the stability of the marine-based ice sheet of West Antarctica.

该奖项支持对氧气的持续调查， 碳同位素组成与海洋生物地层 环南极海洋的沉积序列。 这些 研究的目的是重建古气候， 南极地区的古海洋学和生物进化 在新生代。 2000年以来的海洋学和气候演变 始新世中期（过去的5200万年）主要由 极地的逐渐冷却和冰川作用， 在热带变暖。 气候和冰川的演变 包括南极洲在内的极地地区，对我们的 长期的全球气候变化，因为 纬度是对外部驱动最敏感的地区之一， 变化 涉及冰丘和底部的强反馈机制 水的形成有助于极地的发展。 新生代海相地层记录主要是 这种高纬度的气候演变， 有最完整的记录。 这次调查将 增加代用气候和环境指标的记录， 使用现有的大洋钻探计划（ODP）核心。 为 古近系（古新世至渐新世），工作重点是岩心 ODP第113、119和120航段。 新近纪（渐新世 到目前为止），工作将集中在ODP核心从低和中 西南和赤道太平洋的纬度。 这项工作将 大大有助于普遍了解的作用， 全球气候变化中的极地地区。 此外，这项工作 将有助于我们理解 南极的环南极海流与全球气候过程。 这项工作特别有助于解决 关于西海岸冰盖稳定性的问题 南极洲