Iron Regulation of North Atlantic Eddy Phytoplankton Productivity
Iron Regulation of North Atlantic Eddy Phytoplankton Productivity
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DOI：
10.1029/2020gl091403
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发表时间：
2021-03-28
影响因子：
5.2
通讯作者：
Achterberg, Eric P.
中科院分区：
文献类型：
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作者：
Browning, Thomas J.;Al-Hashem, Ali A.;Achterberg, Eric P.
旋风海洋涡流驱动了深水的上升，营养物质可以提高浮游植物的生产力。在北大西洋的中纬度地区，卫星图像显示出增强的叶绿素-A与涡流相关。但是，表面大量营养素浓度通常在该区域没有完全耗尽，这意味着增强的大量营养素供应不是主要控制。我们在春末，在纽芬兰大银行以东800和350公里的春末进行了高分辨率采样。两种涡流之外的水都有未使用的残留大量营养素，低溶解的铁和铁压浮游植物。在两个涡流中，浮游生物生物量较高，大量营养素浓度较低。但是，只有在大陆架附近的涡流中存在全部大量营养素的缩水和缺乏铁应力。从这两个示例中，铁供应和与货架铁源的接近性似乎是调节北大西洋中纬度旋风涡流中生产力和大量营养素利用率的重要因素。
Cyclonic ocean eddies drive upwelling of deep waters enhanced in nutrients, which can elevate phytoplankton productivity. At mid-latitudes in the North Atlantic, satellite images show enhanced chlorophyll-a associated with eddies. However, surface macronutrient concentrations are often not fully depleted in this region, implying enhanced macronutrient supply is not the primary control. We conducted high resolution sampling through two mid-latitude Atlantic eddies in late spring, located 800 and 350 km east of the Newfoundland Grand Banks. Waters outside of both eddies had unused residual macronutrients, low dissolved iron, and iron-stressed phytoplankton. Inside both eddies, plankton biomass was higher and macronutrient concentrations lower. However, full macronutrient drawdown and an absence of iron stress were only present in the eddy nearer the continental shelf. From these two examples, iron supply and proximity to shelf iron sources appear to be important factors regulating productivity and macronutrient utilization in mid-latitude North Atlantic cyclonic eddies.