SGER: Collaborative Research - Mechanisms behind non-Redfieldian P Cycling in Water Masses of the Southern Ocean, New Insights from X-ray Spectromicroscopy and Electrodialysis

在全球海洋的大部分地区，氮（N）与磷的（Redfield）比率是非常恒定的，无论是在海水中这些营养物质的浓度还是在它所支持的浮游生物物种中。对亚南极模式水（一种对流形成的下降水类型，通过其异常均匀的特性可以识别）的一些研究表明，高纬度P循环从Redfield平衡中改变，导致与低纬度沃茨相比异常富集P。基于同步加速器的X射线光谱显微镜将用于在亚微米尺度上进行化学表征和空间映射。生物体和海洋颗粒物中几种磷形式（如多磷酸盐、有机磷化合物）的丰度。这些样本将沿着I/B Oden号从蓬塔阿雷纳斯经别林斯高晋、阿蒙森和罗斯海区域前往麦默多站的巡航轨道采集，这将提供一套来自偏远和研究不足的冰架和冰下生态系统的独特数据。南极海洋磷状况的表征有望进一步阐明南大洋磷地球化学的各个方面。以及使用新的表征技术，这可能会导致一个变革性的重述方面的南大洋磷化学，该项目符合一个额外的SGER标准，代表了快速响应的国际现场运动的机会，由断面的瑞典破冰船I/B奥登从蓬塔阿雷纳斯到麦克默多通过别林斯高晋海，阿蒙森和罗斯海。

In much of the global ocean the (Redfield) ratio of nitrogen (N) to P is remarkably constant, both in the concentrations of these nutrients in seawater and in the plankton species that it supports. A number of studies of sub-Antarctic mode water, a convectively formed descending water type identifiably by its exceptionally uniform properties, suggest that high latitude P cycling is altered from the Redfield balance resulting in unusually enriched P compared to low latitude waters .Synchrotron based x-ray spectromicroscopy will be used to chemically characterize and spatially map, at sub micron dimensions, the abundance of several P forms (e.g. polyphosphates, organo-P compounds) in organisms and marine particulates. These samples will be taken along the cruise track of the I/B Oden as it transits from Punta Arenas to McMurdo Station, through the Bellingshausen, Amundsen and Ross Sea regions,and which will provide a unique data set from a remote and understudied ice shelf and under-ice ecosystem. Characterization of Antarctic ocean P status is expected to shed further light upon aspects of Southern Ocean P biogeochemistry. As well as using novel characterization techniques, which may lead to a transformative restatement of aspects of Southern Ocean P chemistry, this project meets an additional SGER criteria of representing a quick response to an international field campaign opportunity afforded by the transect of the Swedish ice breaker I/B Oden from Punta Arenas to McMurdo through the Bellingshausen, Amundsen and Ross Seas.