Investigation of Marine Organic Carbon Cycles in the North Pacific and Atlantic Oceans

北太平洋和大西洋海洋有机碳循环的调查

• 批准号: 9100181
• 负责人: Peter Williams
• 金额: $ 20.51万
• 依托单位: University of California-San Diego Scripps Inst of Oceanography
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-05-01 至 1995-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9100181&HistoricalAwards=false
• 关键词: Investigation; Marine; Organic; Carbon; Cycles

This project will complete ongoing investigations of the role of dissolved organic carbon (DOC) in oceanic carbon cycles. Speci- fically, radiocarbon (14C) and stable carbon isotope (13C) ratios will be measured in two DOC pools: the fraction oxidized by ultraviolet (uv) radiation, and the fraction oxidized by high- temperature (HT) combustion. These isotopic signatures, coupled with total DOC concentrations (uv and HT) and the 14C, 13C and 15N signatures of sinking and suspended particulate organic carbon pools, will further our understanding of the sources and rates of cycling of dissolved organic matter in the oceans. Isotopic signatures (14C, 13C) and total concentrations will be completed for DOC in seawater samples collected in the north central Pacific gyre, the Sargasso Sea, and the Santa Monica Basin off Southern California. Additional measurements will be made on samples to be collected in the Amazon River plume and from an open-ocean station in the northeast Pacific off Point Conception, California. These latter measurements will be in conjunction with E. Druffel, WHOI, and J. Bauer, Florida State University. It is also planned to confirm the DOC-HT 14C measurements by other oxidation techniques, such as ultrasonication and Hg(II) complexation of chloride ion coupled with uv irradiation. The goals of this project are directly related to those of the U.S. Joint Global Ocean Flux Study (GOFS).

该项目将完成正在进行的关于 溶解有机碳（DOC）在海洋碳循环中的作用。 特殊- 碳同位素、放射性碳（14 C）和稳定碳同位素（13 C）比值 将在两个DOC池中测量： 紫外线（UV）辐射和被高- 高温燃烧。 这些同位素特征 总DOC浓度（UV和HT）和14 C，13 C和 沉降和悬浮颗粒有机物的15 N特征 碳库，将进一步我们了解的来源， 海洋中溶解有机物的循环速率。 同位素特征（14 C，13 C）和总浓度将在 在北部收集的海水样品中DOC的完成 中太平洋环流、马尾藻海和圣莫尼卡 南加州外的盆地。 额外的测量将 在亚马逊河羽流中收集的样本上制作的， 从太平洋东北部的一个开放海洋站 加州的康塞普西翁。 这些测量结果将在 与E. Drugs，WHOI和J. Bauer，佛罗里达州 大学 还计划通过以下方式确认DOC-HT 14 C测量值： 其他氧化技术，如超声波和Hg（II） 氯离子络合与UV照射耦合。 该项目的目标与 美国联合全球海洋通量研究（GOFS）。