Radiocarbon in Dissolved Organic Matter in the Arctic Ocean

北冰洋溶解有机物中的放射性碳

• 批准号: 1022716
• 负责人: Ellen Druffel
• 金额: $ 53.86万
• 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: 2010-09-01 至 2015-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1022716&HistoricalAwards=false
• 关键词: Radiocarbon; Dissolved; Organic; Matter; Arctic

The average radiocarbon age of dissolved organic carbon (DOC) in the deep ocean ranges from 4000 - 6500 radiocarbon years. The data set used to estimate this range is based on only a few sites in the world ocean, none of which are in the Arctic. The objective of this proposal is to determine the radiocarbon signatures of bulk DOC in seawater from the Arctic Ocean to better understand the timescale of DOC cycling in the area that receives the highest amount of terrestrial DOC per unit volume than any other ocean. Participation in one cruise to the northern North Atlantic, and on two other cruises, to the Eurasian Basin and Canada Basin, is proposed to collect water samples from six detailed profiles. High-precision radiocarbon measurements are proposed using AMS (accelerator mass spectrometry) of DOC in water samples from each site. Two hypotheses will be tested: (1) bulk DOC in the deep Canada Basin (western Arctic) is several hundred radiocarbon years older than that in the deep Eurasian Basin (eastern Arctic), and these ages can be used to determine the cycling time of DOC in the deep Arctic Ocean; and (2) bulk DOC in the northern North Atlantic Ocean (61-62.5°N) is younger than in the Eurasian Basin, because of the presence of bomb radiocarbon in this region of deep water formation. These results will provide quantitative information on the timescale of DOC cycling in the Arctic Ocean. This grant will support the work of one graduate student and two undergraduate students and provide hands-on experience that will prepare them for careers as scientists and educators. The PI will conduct outreach and mentoring activities at several educational and professional levels.

深海中溶解有机碳（DOC）的平均放射性碳年龄范围为4000 - 6500放射性碳年。用于估计此范围的数据集仅基于世界海洋中的几个地点，而这些地点都不在北极。该提案的目的是确定从北极海洋中海水中散装DOC的放射性碳签名，以更好地了解该地区的DOC循环时间比其他任何海洋都比其他任何海洋都获得最高的陆地DOC。建议参与北大西洋北部的一次巡游，并在另外两次巡游中参与欧亚盆地和加拿大盆地，提议从六个详细概况中收集水样。使用来自每个地点的水样品中DOC的AM（加速器质谱法）提出了高精度放射性测量值。将测试两个假设：（1）加拿大深处的盆地（西北极）的大量DOC比在深欧亚盆地（东北极地区）大的几百个放射性碳年龄，并且可以使用这些时代来确定深北极海洋中DOC的循环时间； （2）北大西洋北部的散装DOC（61-62.5°N）比欧亚盆地年轻，因为在深水形成的地区存在炸弹放射性碳。这些结果将提供有关北极海洋DOC骑自行车时间尺度的定量信息。该赠款将支持一名研究生和两名本科生的工作，并提供动手经验，以使他们成为科学家和教育工作者的职业。 PI将在几个教育和专业层面进行宣传和心理活动。