Ages of River Plumes and Freshened Coastal Waters Using Ra-224 and Ra-223

使用 Ra-224 和 Ra-223 测定河流羽流的年龄和新鲜的沿海水域

• 批准号: 9314587
• 负责人: Willard Moore
• 金额: $ 34.15万
• 依托单位: University of South Carolina at Columbia
• 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: 1993-12-01 至 1998-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9314587&HistoricalAwards=false
• 关键词: Ages; River; Plumes; Freshened; Coastal

9314587 MOORE This research project will use short lived radium isotopes to determine the ages of freshened waters as these waters move and mix from the coastal zone into the open ocean. These techniques should enable marine scientists to tract the movement and mixing of coastal waters on time scales of a few days to several weeks. These studies will provide important information on the coupling between the coastal ocean and the ocean and the ocean interior. When combined with other studies, these techniques will enable oceanographers to assess fluxes of materials across the density gradient separating freshened coastal waters from the rest of the surface ocean. This work is based on a new measurement technique for short lived Ra isotopes, 224 Ra (half life = 3.6 days) and 223 Ra (half life = 11.4 days). Most of the effort will be devoted to technique development and verification initially. Field Studies will then determine (1) the rate at which the freshened river plume of the Mississippi River intrudes into the Gulf of Mexico and (2) the rate of mixing from near coastal waters across the inner and mid shelf region of the south Atlantic Bight.

9314587 MOORE 该研究项目将使用短命镭同位素来确定淡水从沿海地区移动并混合到公海时的年龄。 这些技术应该使海洋科学家能够在几天到几周的时间尺度上追踪沿海水域的运动和混合。这些研究将为沿海海洋与海洋以及海洋内部之间的耦合提供重要信息。当与其他研究相结合时，这些技术将使海洋学家能够评估将新鲜的沿海水域与其他表层海洋分开的密度梯度上的物质通量。 这项工作基于短寿命 Ra 同位素 224 Ra（半衰期 = 3.6 天）和 223 Ra（半衰期 = 11.4 天）的新测量技术。最初大部分工作将致力于技术开发和验证。 然后，实地研究将确定（1）密西西比河新鲜河流羽流侵入墨西哥湾的速率，以及（2）从近岸水域穿过南大西洋湾内陆架和中部陆架区域的混合速率。