Vertical turbulent iron flux sustains the Green Belt along the shelf break in the southeastern Bering Sea
Vertical turbulent iron flux sustains the Green Belt along the shelf break in the southeastern Bering Sea
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DOI：
10.1029/2012gl051164
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发表时间：
2012-04
影响因子：
5.2
通讯作者：
Takahiro Tanaka;I. Yasuda;K. Kuma;Jun Nishioka
中科院分区：
文献类型：
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作者：
Takahiro Tanaka;I. Yasuda;K. Kuma;Jun Nishioka
为了评价白令海绿带（GB）垂直湍流铁通量对夏季生物生产力的影响，首次在白令海进行了溶解铁（D - Fe）和湍流的同步观测。研究表明，沿东南陆架断裂分布的富含铁的地下厚层，通过强烈的湍流垂直混合，可以维持大陆架的形成。D - Fe和硝酸盐的通量比在GB浮游植物对N/Fe吸收比的范围内，表明这种养分通量可以维持GB生产力。我们还分析了历史水文数据，认为沿GB的厚次表层是由相对温暖的水与来自阿留申山口的一些铁和富含铁的外大陆架冷水混合形成的，其中来自海底沉积物的D - Fe由于强烈的垂直混合而悬浮在其中。
To evaluate the impact of vertical turbulent iron flux on the summertime biological productivity in the Bering Sea Green Belt (GB), we conducted the concurrent observations of dissolved iron (D‐Fe) and turbulence in the Bering Sea for the first time. We show that the GB can be sustained by iron supply from iron‐rich, subsurface thick layer distributed along the southeastern shelf break where the GB is located, via strong turbulent vertical mixing. The flux ratio of D‐Fe and nitrate was within the range of the N/Fe uptake ratio by GB phytoplankton, suggesting this flux of nutrients can sustain GB productivity. We also analyzed historical hydrographic data and suggest the thick subsurface layer along the GB is formed by the mixing of relatively warm water with some iron from the Aleutian Passes and iron‐rich outer‐shelf cold water in which the D‐Fe derived from seafloor sediment is suspended due to strong vertical mixing.