Abstract Dust inputs to the oligotrophic waters of the subtropical North Atlantic are of significant importance to the biogeochemistry of the region. In this work, we present fluxes of particles, soluble elements (H+, major ions, Fe and organic ions) in dry deposition (DD) and wet deposition (WD) samples collected between September 2012 and April 2016. Positive Matrix Factorization Model (PMF) indicated four dominant factors influencing the elemental concentrations: marine, crustal and two anthropogenic. Soluble Fe fluxes appear to be affected predominantly by aerosol particle type, with higher values observed at lower dust loading. Although WD fluxes made up only a small fraction of total particle fluxes (12%), they represented an important input of soluble Fe and other nutrients such as nitrate (more than 50% of total amount deposited). This significant contribution to total deposition fluxes may have important consequences for primary production in the surface ocean. Mineral dust is the primary source of soluble atmospheric P to the north Atlantic, which is a region that is already P stressed. Our data show that DD dominates the total flux of soluble P to this area (∼87% of the total flux) and it may have a bigger impact in the diazotroph communities during the summer months when the water column is more stratified and nutrient inputs from deeper water are restricted.

中文翻译：

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可溶性营养物质和铁的大气通量：大加那利岛（加那利群岛）三年多的干湿沉降测量

摘要 进入亚热带北大西洋贫营养水域的沙尘输入对该地区的生物地球化学具有重要意义。在这项工作中，我们展示了 2012 年 9 月至 2016 年 4 月期间收集的干沉积 (DD) 和湿沉积 (WD) 样品中颗粒、可溶性元素（H+、主要离子、Fe 和有机离子）的通量。 正矩阵分解模型 (PMF) ) 表明影响元素浓度的四个主要因素：海洋、地壳和两个人为因素。可溶性 Fe 通量似乎主要受气溶胶颗粒类型的影响，在较低的粉尘负载下观察到较高的值。尽管 WD 通量仅占总颗粒通量的一小部分（12%），但它们代表了可溶性 Fe 和其他营养物质（如硝酸盐）的重要输入（占沉积总量的 50% 以上）。这种对总沉积通量的显着贡献可能对表层海洋的初级生产产生重要影响。矿物粉尘是北大西洋可溶大气磷的主要来源，该地区已经受到磷的压力。我们的数据表明，DD 主导着该区域可溶性 P 的总通量（总通量的 87%），并且在夏季月份水体更加分层且养分输入来自更深的水受到限制。