SGER: Science-of-Opportunity Aboard Icebreaker Oden: Bioactive trace metals in the Amundsen and Ross Seas

本文的研究目的是：（1）确定阿蒙森海和罗斯海沿着采样断面上溶解态和悬浮态生物活性痕量金属的分布和动态。以及（2）测试整体细胞金属化学计量（金属/碳比）对物种组合和Fe有效性的自然梯度的敏感性。我们早期的研究结果，从一个单一的罗斯海站和德雷克通道过境表明，铁有限的浮游植物细胞异常丰富的锌，铜和镉相对于生物量碳，这些元素相对于南大洋的碳通量的地球化学循环的强烈影响。 我们还将与其他研究人员合作，在船上孵化研究中测量暴露于预测的2010年温度和二氧化碳水平的细胞的金属化学计量，作为了解气候变化对这些地区金属地球化学可能影响的窗口。 该提案将支持密切的国际合作和持久的基础设施发展，因为美国和瑞典的科学家，更重要的是，他们的学生，致力于共同的目标，即了解一个正在经历地球仪上气候变化最快的地区之一。微量金属微量营养盐是南极海洋生态系统生产力的关键控制因素。我们的研究结果将通过研究出版物和互联网数据库广泛提供，并通过罗格斯大学的COSEE进行公众宣传。

AbstractThe research objective is (1) to determine the distributions and dynamics of a full suite of bioactive trace metals in dissolved and suspended particulate forms, along sampling transects of the Amundsen and Ross Seas. And (2) to test the sensitivity of overall cellular metal stoichiometry (metal/carbon ratios) to natural gradients in species assemblage and Fe availability. Our earlier findings from a single Ross Sea station and from a Drake Passage crossing suggest that Fe-limited phytoplankton cells are unusually enriched in Zn, Cu and Cd relative to biomass carbon, with strong implications for the biogeochemical cycling of these elements relative to carbon fluxes in the Southern Ocean. In collaboration with other researchers on the cruise, we will also measure metal stoichiometry of cells exposed to predicted 2010 temperature and carbon dioxide levels in shipboard incubation studies, as a window into possible effects of climate change on metals biogeochemistry in these regions. This proposal will support close international collaborations and lasting infrastructure development as US and Swedish scientists, and more importantly, their students, work toward shared the shared goal of understanding a region that is experiencing one of the fastest rates of climate change on the globe. Trace metal micro-nutrients are a key control on the productivity of Antarctic marine ecosystems. Our results will be made widely available through research publications and internet-available databases, and public outreach through COSEE at Rutgers University.