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首页> 外文期刊>Estuarine Coastal and Shelf Science >Leachable particulate iron in the Columbia River, estuary, and near-field plume
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Leachable particulate iron in the Columbia River, estuary, and near-field plume

机译：哥伦比亚河，河口和近场羽中可浸出的颗粒铁

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This study examines the distribution of leachable particulate iron (Fe) in the Columbia River, estuary, and near-field plume. Surface samples were collected during late spring and summer of 2004-2006 as part of four River Influence on Shelf Ecosystems (RISE) cruises. Tidal amplitude and river flow are the primary factors influencing the estuary leachable particulate Fe concentrations, with greater values during high flow and/or spring tides. Near the mouth of the estuary, leachable particulate Fe [defined as the particulate Fe solubilized with a 25% acetic acid (pH 2) leach containing a weak reducing agent to reduce Fe oxyhydroxides and a short heating step to access intracellular Fe] averaged 770 nM during either spring tide or high flow, compared to 320 nM during neap tide, low flow conditions. In the near-field Columbia River plume, elevated leachable particulate Fe concentrations occur during spring tides and/or higher river flow, with resuspended shelf sediment as an additional source to the plume during periods of coastal upwelling and spring tides. Near-field plume concentrations of leachable particulate Fe (at a salinity of 20) averaged 660 nM during either spring tide or high flow, compared to 300 nM during neap tide, low flow conditions. Regardless of tidal amplitude and river flow, leachable particulate Fe concentrations in both the river/estuary and near-field plume are consistently one to two orders of magnitude greater than dissolved Fe concentrations. The Columbia River is an important source of reactive Fe to the productive coastal waters off Oregon and Washington, and leachable particulate Fe is available for solubilization following biological drawdown of the dissolved phase. Elevated leachable Fe concentrations allow coastal waters influenced by the Columbia River plume to remain Fe-replete and support phytoplankton production during the spring and summer seasons.
机译：这项研究检查了哥伦比亚河，河口和近场烟羽中可浸出颗粒铁的分布。在2004-2006年春末和夏季期间，收集了地面样本，这是四个河流对架子生态系统（RISE）的影响。潮汐幅值和河流流量是影响河口可浸出颗粒中铁浓度的主要因素，在高流量和/或春季潮汐时，其值较大。在河口附近，可浸出的微粒Fe [定义为用25％的乙酸（pH 2）浸出的微粒Fe，其中浸有弱还原剂以还原羟基氧化铁，并且加热步骤很短，可进入胞内Fe]平均为770 nM在春季潮汐或高流量条件下，与之相比，在春季潮汐或低流量条件下为320 nM。在近场的哥伦比亚河羽流中，春季潮汐和/或较高的河流流量中会产生可浸出的颗粒状铁浓度升高，在沿海上升和春季潮汐期，重悬的架子沉积物是羽流的额外来源。春季潮汐或高流量时，可浸出颗粒铁（盐度为20）的近场羽流平均浓度为660 nM，而潮汐低潮时为300 nM。无论潮汐振幅和河流流量如何，河流/河口羽流和近场羽流中可浸出的颗粒铁浓度始终比溶解的铁浓度高一到两个数量级。哥伦比亚河是俄勒冈州和华盛顿州附近沿海生产性水的重要反应铁的来源，可溶的颗粒状铁可在溶解相的生物吸收后用于溶解。较高的可浸出铁浓度可使受哥伦比亚河羽流影响的沿海水域保持富铁状态，并在春季和夏季支持浮游植物的生产。

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