Primary Production Rates in the N. Atlantic for O2 Isotopes and O2/Ar

北大西洋 O2 同位素和 O2/Ar 的初级生产率

• 批准号: 0726510
• 负责人: Paul Quay
• 金额: $ 49.42万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-08-01 至 2012-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0726510&HistoricalAwards=false
• 关键词: Primary; Production; Rates; N.; Atlantic

Because of the mounting evidence that the ocean's biological pump changes with natural climate shifts, a major task of oceanographers over the coming decade is to separate natural from anthropogenic shifts in the strength of the ocean's biological pump. Despite its global importance, the ocean's biological pump rate is not really well known. Variability of primary production rates on short time and space scales makes difficult the accurate measurement of rates using traditional 14C-based methods. There is a clear need to use alternative primary production rate measurement methods that are more accurate, less time consuming to apply and can integrate over longer time/space scales. In this research, a scientist from the University of Washington will determine, on a detailed spatial and temporal scale, the annual cycle of gross primary production and net community production rates across the subarctic N. Atlantic Ocean. He will make almost monthly measurements (~50/month over 3 years) of both the triple isotopic composition of dissolved oxygen gas (17') and the dissolved oxygen and argon gas ratio (O2/Ar) on surface seawater samples collected during repeated container ship crossings of the N. Atlantic with ~1' of longitude resolution across the basin. These sample collections will be made as part of the CARBOOCEAN program through a collaboration with researchers at U. Kiel. Additionally, in collaboration with another NSF-funded expedition, he will measure the same rates in the subarctic N. Atlantic in Spring 2008 where floats, seagliders and satellites will be used to examine the biological response during the spring bloom to mesoscale physical forcing (e.g. fronts, storms, eddies). This suite of measurements will permit determination of the annual cycle of gross primary production and net community production across the subarctic N. Atlantic Ocean, clarify the impact that spatial and temporal variations of net community production have on surface pCO2 levels and net air-sea CO2 uptake, and examine the relationship between mesoscale variability in primary production rates and physical forcing during the spring bloom in the N. Atlantic. The broader impacts of the proposed research include helping to improve predictions of future global warming due to atmospheric CO2 increases. The proposed work involves a substantial collaboration with the European oceanographic community and will support an undergraduate student in the research.

由于有越来越多的证据表明海洋的生物泵随着自然气候变化的变化而变化，在未来十年中，海洋学家的主要任务是将自然与海洋生物泵强度的人为变化分开。尽管它具有全球重要性，但海洋的生物泵率并不是很广为人知。短时间和空间尺度上初级生产率的变化使得使用传统的14C方法可以准确地测量速率。显然需要使用替代的初级生产率测量方法，这些方法更准确，耗时较少，并且可以在更长的时间/空间尺度上整合。在这项研究中，华盛顿大学的一位科学家将根据详细的空间和时间范围确定整个亚北方大西洋的年度初级生产和净社区生产率的年度周期。 他将对溶解的氧气（17'）的三倍同位素组成（在3年内进行约50个月）进行测量（17'），以及在跨底层的N. Atlantic Crossing the N. Atlantic Crossing期间收集的地表海水样品上收集的地表海水样品的溶解氧和氩气比（O2/AR）。这些样本集将通过与U. Kiel的研究人员合作作为碳水化合物计划的一部分。此外，他将与另一次由NSF资助的探险队合作，在2008年春季春季大西洋亚大西洋的相同速度中，将使用浮子，海上滑板和卫星来检查春季绽放对中尺度的物理强迫期间的生物反应（例如，前线，风暴，埃迪斯，埃迪斯）。这套测量套件将允许确定北极大西洋的主要生产和净社区生产的年度周期，阐明了净社区生产的空间和时间变化对表面PCO2水平和净空气SEA CO2的吸收的影响，并检查在春季spring spring n. arne n. arthementing n. at. arthementy in. arthem in. arn. arn. arn. arn. arne in. arth in。拟议研究的更广泛的影响包括有助于改善由于大气二氧化碳增加而对未来全球变暖的预测。拟议的工作涉及与欧洲海洋学社区进行实质性的合作，并将支持本科生的研究。