Collaborative Research: Developing a Continuous Reconstruction of Tropical Pacific Climate Over the Last 500-700 Years: Analysis of Massive Porites Corals from American Samoa

合作研究：对过去 500-700 年热带太平洋气候进行持续重建：对美属萨摩亚大量滨珊瑚的分析

• 批准号: 1203783
• 负责人: Braddock Linsley
• 金额: $ 23.75万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-08-15 至 2015-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1203783&HistoricalAwards=false
• 关键词: Collaborative; Research; Developing; Continuous; Reconstruction

Records of baseline ocean-atmosphere variability provide critical context for understanding changes in mean climate state. However, ocean-atmosphere variability is not well understood during the time between the anomalous Medieval Warm Period/Little Ice Age and the present (the last ~500-800 years). This project-- a collaboration between Columbia University's Lamont Doherty Earth Observatory and Stanford University-- will develop a proxy record of variability in the western tropical Pacific over the past 500+ years. Coral cores collected from giant Porites colonies in Ta'u Island, American Samoa, will be analyzed for interannual- to centennial-scale variability in temperature and salinity (Sr/Ca and oxygen isotopes), indicating changes in the extent of the South Pacific Convergence Zone.The researchers will partner with the National Park of American Samoa to construct an exhibit illustrating the use of long coral cores to study environmental change. This exhibit, displayed at the park's information center, will include Ta'u coral core material and data associated with this study. The project will support a post-doctoral researcher at Lamont and a graduate student at Stanford.

基线海洋-大气变率的记录为理解平均气候状态的变化提供了关键的背景。然而，从异常的中世纪暖期/小冰期到现在（最近500-800年）期间的海洋-大气变率尚未得到很好的理解。这个项目是哥伦比亚大学的拉蒙特·多尔蒂地球观测站和斯坦福大学的合作项目，将开发一个过去500多年来热带太平洋西部变化的代理记录。将分析从美属萨摩亚Ta'u岛的巨型波氏岩群落收集的珊瑚芯，以确定温度和盐度（Sr/Ca和氧同位素）的年际至百年尺度变化，这表明南太平洋辐合带范围的变化。研究人员将与美属萨摩亚国家公园合作，建造一个展览，展示使用长珊瑚核来研究环境变化。这次展览在公园的信息中心展出，将包括塔乌珊瑚的核心材料和与这项研究相关的数据。该项目将支持拉蒙特大学的一名博士后研究员和斯坦福大学的一名研究生。