Atmospheric deposition of nutrients to the Atlantic Ocean
Atmospheric deposition of nutrients to the Atlantic Ocean
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DOI：
10.1029/2003gl018518
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发表时间：
2003-12-31
影响因子：
5.2
通讯作者：
Jickells, TD
中科院分区：
文献类型：
--
作者：
Baker, AR;Kelly, SD;Jickells, TD
在以前的工作中，分别描述了大气沉积的铁、氮和磷在向海洋系统提供营养物方面的作用。在这里，我们研究大气干沉降的所有这些营养物质同时，在大西洋的两个跨大西洋断面收集的样本。我们发现，与以前的工作一致，沙漠灰尘提供多余的铁的水柱。然而，在某些情况下，气溶胶氮促进的初级生产足以消耗所有的可溶性气溶胶铁输入。气溶胶N：P普遍很高，因此相对于浮游植物的需求，气溶胶中的P总是不足的。因此，由任何过量的大气铁供应和浮游植物利用大气营养输入刺激的固氮将倾向于驱动生态系统对磷的限制。这就强调需要以综合的方式研究大气营养物沉积的地球化学影响。
The role of atmospheric deposition of iron, nitrogen and phosphorus in supplying nutrients to marine systems has been described, individually, in previous works. Here we examine atmospheric dry deposition of all these nutrients simultaneously, using samples collected during two meridional transects of the Atlantic Ocean. We find that, in line with previous work, desert dust supplies excess iron to the water column. However, primary production promoted by aerosol nitrogen can be sufficient to consume all of the soluble aerosol iron input in some situations. Aerosol N:P is universally very high, so that aerosol is always deficient in P relative to phytoplankton requirements. Nitrogen fixation stimulated by any excess atmospheric iron supply and phytoplankton utilisation of atmospheric nutrient inputs will therefore tend to drive the ecosystem towards P limitation. This emphasises the need to study the biogeochemical impact of atmospheric nutrient deposition in an integrated manner.