Iron from a submarine source impacts the productive layer of the Western Tropical South Pacific (WTSP).

Iron from a submarine source impacts the productive layer of the Western Tropical South Pacific (WTSP).
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DOI:
10.1038/s41598-018-27407-z
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发表时间:
2018-06-13
期刊:
影响因子:
4.6
通讯作者:
Moutin T
Moutin T
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Guieu C;Bonnet S;Petrenko A;Menkes C;Chavagnac V;Desboeufs K;Maes C;Moutin T

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在西热带南太平洋,在火山岛附近发现了与固定n2生物的出现有关的高叶绿素浓度斑块。这些生物的生存依赖于高生物可利用铁的供应,其来源和通量尚不清楚。在这里,我们测量了高溶解铁(DFe)浓度(高达66 nM),在约20°S纬度上沿纬向延伸超过10°经度(174 E - 175 W)。DFe大气通量位于遥远海洋报告值的低端,无法解释汤加附近水柱中测量到的高DFe浓度。我们认为,高DFe浓度可能是由海底来源维持的,也以淡水输入为特征,并通过Argo浮子原位测量和地图集数据记录为盐度异常。观测到的负盐度异常由一般海洋环流模式的模拟再现。到达光层的海底铁源可能影响整个地区的固氮作用。
In the Western Tropical South Pacific, patches of high chlorophyll concentrations linked to the occurrence of N2-fixing organisms are found in the vicinity of volcanic islands. The survival of these organisms relies on a high bioavailable iron supply whose origin and fluxes remain unknown. Here, we measured high dissolved iron (DFe) concentrations (up to 66 nM) in the euphotic layer, extending zonally over 10 degrees longitude (174 E−175 W) at ∼20°S latitude. DFe atmospheric fluxes were at the lower end of reported values of the remote ocean and could not explain the high DFe concentrations measured in the water column in the vicinity of Tonga. We argue that the high DFe concentrations may be sustained by a submarine source, also characterized by freshwater input and recorded as salinity anomalies by Argo float in situ measurements and atlas data. The observed negative salinity anomalies are reproduced by simulations from a general ocean circulation model. Submarine iron sources reaching the euphotic layer may impact nitrogen fixation across the whole region.
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