Tropical Hydrography and Atlantic Salinity Since the Glacial Maximum Near the Bahamas

自巴哈马附近冰川盛期以来的热带水文学和大西洋盐度

• 批准号: 0502428
• 负责人: William Curry
• 金额: $ 36.07万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-05-01 至 2008-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0502428&HistoricalAwards=false
• 关键词: Tropical; Hydrography; Atlantic; Salinity; Since

The award will examine the salinity history of the North Atlantic subtropical gyre since the last glacial period. Specifically, it will examine magnesium and calcite isotopic records from planktonic foraminifera in cores from the Bahamas Islands in an effort to assess the timing and magnitude of Atlantic Ocean overturning circulation on orbital and millennial time scales. The implication from previous research in this region is that large changes in the hydrological cycle of the Atlantic occur on these time scales.The results of this research will be important for understanding how the hydrological cycle has changed in the past in response to natural forcing and how the changes feed back into other parts of the climate system. The results may lead to greater understand of the response of the Earth's hydrological cycle to current and future greenhouse forcing and how future changes in ocean hydrography may alter circulation patterns and climate. Quantitative estimates of past ocean salinity will be of use to ocean and climate modelers as a test of the sensitivity of their models to past climate forcing. This project will fund high school students who will help process forams for taxonomic and chemical analyses. As in the past, students who have worked in the researcher's laboratory will have the opportunity to present the results of their scientific experiments as part of local and regional science fairs.

该奖项将研究自上一次冰期以来北大西洋副热带环流的盐度历史。具体地说，它将审查巴哈马群岛岩心浮游有孔虫的镁和方解石同位素记录，以努力评估大西洋在轨道和千年时间尺度上颠覆环流的时间和规模。这项研究的结果对于理解过去水循环是如何响应自然强迫的变化以及这些变化如何反馈到气候系统的其他部分将是重要的。这些结果可能有助于更好地理解地球水文循环对当前和未来温室压力的响应，以及未来海洋水文地貌的变化可能如何改变环流模式和气候。对过去海洋盐度的定量估计将用于海洋和气候建模人员，以测试他们的模型对过去气候强迫的敏感性。这个项目将资助高中生，他们将帮助加工用于分类和化学分析的有孔虫。与过去一样，在研究人员实验室工作的学生将有机会在当地和地区性科学博览会上展示他们的科学实验结果。