Radiocarbon in Dissolved Organic Matter in Ocean Water

海水中溶解有机物中的放射性碳

• 批准号: 0961980
• 负责人: Ellen Druffel
• 金额: $ 57.09万
• 依托单位: University of California-Irvine
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-02-01 至 2014-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0961980&HistoricalAwards=false
• 关键词: Radiocarbon; Dissolved; Organic; Matter; Ocean

The average radiocarbon (14C) age of dissolved organic carbon (DOC) in the deep ocean ranges from 4000-6500 14C years. However, the data set used to estimate this range is based on only a few sites in the world ocean. For this reason, a scientist from the University of California, Irvine will participate in three CLIVAR Repeat Hydrography cruises to collect water samples from six detailed profiles in the Pacific and Atlantic Oceans for which there is no data (P6-along 32°S in the South Pacific, A10 along 30°S in the South Atlantic, and A20 along 50°W in the North Atlantic). Seawater samples will be analyzed by accelerator mass spectrometry to determine the 14C signatures of DOC. In addition, the black carbon from DOC will be isolated and analyzed for 14C and 13C signatures. With the data set, the scientist plans to test the following three hypotheses: (1) 14C of bulk DOC in the South Pacific Ocean is intermediate between values in the Southern Ocean and those in the North Pacific, and these 14C ages can be used to determine the timescale of DOC cycling in deep waters of the Pacific; (2) 14C levels in bulk DOC of the Atlantic Ocean are highest in the north (43°N), lower in the equatorial region (10°N) and lowest in the South Atlantic (30°S), and reflects the timescale of DOC cycling as deep water travels south in the western Atlantic; and (3) black carbon constitutes a significant amount of DOC in open ocean water, and its 14C age is greater than 20,000 14C years.The proponent will help high school teachers prepare science curricula for their classes and teaches a short course called "Radiocarbon in Ecology and Earth System Science" during the summer. She currently serves on the board for the Florida Center for Ocean Science Education Excellence and aids in the development of college level web-based educational classes. One graduate and two undergraduate students will be supported and trained as part of this project.

深海中溶解有机碳（DOC）的平均放射性碳（14c）年龄为4000-6500 14c年。但是，用于估算此范围的数据集仅基于世界海洋中的几个地点。出于这个原因，欧文大学的一位科学家将参加三个Clivar重复的水文巡航，以从没有数据的太平洋和大西洋的六个详细概况中收集水样品（南太平洋地区的P6-Along 32°S，A10，A10沿南部大西洋地区的30°S沿着A20沿着A20沿着A20沿着50°W north north north north north antantic s in north antantic of。将通过加速器质谱法分析海水样品，以确定DOC的14C特征。此外，将分离出DOC的黑碳并分析14C和13C特征。有了数据集，科学家计划测试以下三个假设：（1）南太平洋的批量DOC的14C在南洋的价值和北太平洋的价值之间进行了中间，并且可以使用这些14C年龄来确定太平洋深水区深水中的DOC循环时间范围； （2）大西洋批量DOC的14C水平在北部（43°N）最高，较低的位置区域（10°N），在南大西洋（30°S）中最低，并反映了西部大西洋地区深水的DOC骑行时间范围； （3）黑碳在开阔的海水中构成了大量的文档，其14c年龄大于20,000 14c年。支持者将帮助高中教师为他们的课程做好现代的准备，并在夏季教授“生态和地球系统科学中的放射性碳”的简短课程。她目前是佛罗里达海洋科学教育中心卓越中心的董事会成员，并在大学级别的基于Web的教育课程的发展中担任辅助工具。作为该项目的一部分，将为一名研究生和两名本科生提供支持和培训。