Effects of Seawater Carbonate Chemistry on the Stable Isotope Geochemistry of Cultured Benthic Foraminifera

海水碳酸盐化学对养殖底栖有孔虫稳定同位素地球化学的影响

• 批准号: 9633486
• 负责人: Howard Spero
• 金额: $ 17.14万
• 依托单位: University of California-Davis
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-11-01 至 2000-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9633486&HistoricalAwards=false
• 关键词: Effects; Seawater; Carbonate; Chemistry; Stable

Previous work indicates that the particulate organic matter (POM) in sea ice of the Weddell Sea is strongly enriched in 13C and 15N relative to seawater POM. This project will test the hypothesis that stable isotopic values in Southern Ocean sediments are significantly affected by ice-algal input, which may have been misinterpreted as variations in nutrient utilization and productivity. The project will examine transects of surface sediments to determine if a north-south gradient exists consistent with the hypothesis, and will also determine stable isotope variations in several cores spanning the last glacial to track possible changes in ice-algal input.

先前的研究表明，威德尔海海冰中的颗粒有机物（POM）相对于海水POM，13C和15N含量显着富集。 该项目将检验以下假设：南大洋沉积物中的稳定同位素值受到冰藻输入的显着影响，这可能被误解为养分利用率和生产力的变化。 该项目将检查表面沉积物的横断面，以确定是否存在与假设一致的南北梯度，还将确定跨越末次冰期的几个岩心的稳定同位素变化，以跟踪冰藻输入的可能变化。