Dissolved and particulate trace metal micronutrients under the McMurdo Sound seasonal sea ice: basal sea ice communities as a capacitor for iron
Dissolved and particulate trace metal micronutrients under the McMurdo Sound seasonal sea ice: basal sea ice communities as a capacitor for iron
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麦克默多海峡季节性海冰下溶解的和颗粒状的微量金属微量营养素：作为铁电容器的基础海冰群落
作者：
A. Noble;D. Moran;A. Allen;M. Saito
溶解和颗粒金属浓度的报告，从三个网站下，并在底部的麦克默多声音季节性海冰在南极洲罗斯海。该数据集提供了对Co和Mn的地球化学的深入了解，支持了先前关于水柱混合比清除更快发生的假设。有三点意见支持这一点：首先，在水体中存在Mn/Al比超过沉积物的含Mn颗粒，这意味着细菌Mn氧化过程的存在。第二，溶解和不稳定的钴是均匀的深度下的海冰冬季后。第三，溶解的Co：PO 3 −4比例与先前观察到的罗斯海化学计量学一致，这意味着冬季清除相对于混合缓慢。丰富的溶解铁和锰是一致的冬季储备的概念，和颗粒铝，铁，锰，钴共变，这意味着这些金属表现相似。在附近岛屿附近观察到颗粒金属升高，颗粒Fe/Al比与附近沉积物相似，与沉积物再悬浮源一致。溶解和颗粒金属升高，在最浅的深度（特别是铁）与升高颗粒P/Al和Fe/Al比超过沉积物，表现出海冰生物质来源。海冰生物量非常密集（叶绿素a >9500 μg/L），含有高丰度的颗粒金属，金属/铝比值升高。季节性积累的生物活性金属的基础上的麦克默多健全的海冰由基藻群落的假设，类似于电容器，积累铁在春季和初夏。颗粒金属的释放和运输积累在海冰的基础上脱落的讨论作为一个潜在的重要机制，在提供铁营养在冰间藻浮游植物水华形成，并可以在未来的海洋考察。
Dissolved and particulate metal concentrations are reported from three sites beneath and at the base of the McMurdo Sound seasonal sea ice in the Ross Sea of Antarctica. This dataset provided insight into Co and Mn biogeochemistry, supporting a previous hypothesis for water column mixing occurring faster than scavenging. Three observations support this: first, Mn-containing particles with Mn/Al ratios in excess of the sediment were present in the water column, implying the presence of bacterial Mn-oxidation processes. Second, dissolved and labile Co were uniform with depth beneath the sea ice after the winter season. Third, dissolved Co:PO3−4 ratios were consistent with previously observed Ross Sea stoichiometry, implying that over-winter scavenging was slow relative to mixing. Abundant dissolved Fe and Mn were consistent with a winter reserve concept, and particulate Al, Fe, Mn, and Co covaried, implying that these metals behaved similarly. Elevated particulate metals were observed in proximity to the nearby Islands, with particulate Fe/Al ratios similar to that of nearby sediment, consistent with a sediment resuspension source. Dissolved and particulate metals were elevated at the shallowest depths (particularly Fe) with elevated particulate P/Al and Fe/Al ratios in excess of sediments, demonstrating a sea ice biomass source. The sea ice biomass was extremely dense (chl a >9500 μg/L) and contained high abundances of particulate metals with elevated metal/Al ratios. A hypothesis for seasonal accumulation of bioactive metals at the base of the McMurdo Sound sea ice by the basal algal community is presented, analogous to a capacitor that accumulates iron during the spring and early summer. The release and transport of particulate metals accumulated at the base of the sea ice by sloughing is discussed as a potentially important mechanism in providing iron nutrition during polynya phytoplankton bloom formation and could be examined in future oceanographic expeditions.
东大西洋北部和南部表层水中微量元素（Hg、Pb、Cd、Cu、Ni、Zn、Co、Mn、Fe 和 Al）分布的天气横断面
影响因子：
2.8
作者：
Hennings U;Daberkow;Budeus;Rutgers van der Loeff
通讯作者：
Rutgers van der Loeff
影响因子：
5.2
作者：
R. Shelley;P. Sedwick;T. Bibby;Patricia Cabedo-Sanz;T. Church;Rodney J. Johnson;Anna I. Macey;C. Marsay;E. Sholkovitz;S. Ussher;P. Worsfold;M. Lohan
通讯作者：
R. Shelley;P. Sedwick;T. Bibby;Patricia Cabedo-Sanz;T. Church;Rodney J. Johnson;Anna I. Macey;C. Marsay;E. Sholkovitz;S. Ussher;P. Worsfold;M. Lohan