Ligand Binding Strength Explains the Distribution of Iron in the North Atlantic Ocean
Ligand Binding Strength Explains the Distribution of Iron in the North Atlantic Ocean
复制标题
配体结合强度解释了北大西洋中铁的分布
DOI:
10.1029/2019gl083319
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发表时间:
2019
影响因子:
5.2
通讯作者:
Ito, Takamitsu
中科院分区:
文献类型:
--
作者:
Pham, Anh L. D.;Ito, Takamitsu
Observations of dissolved iron (dFe) in the subtropical North Atlantic revealed remarkable features: While the near‐surface dFe concentration is low despite receiving high dust deposition, the subsurface dFe concentration is high. We test several hypotheses that might explain this feature in an ocean biogeochemistry model with a refined Fe cycling scheme. These hypotheses invoke a stronger lithogenic scavenging rate, rapid biological uptake, and a weaker binding between Fe and a ubiquitous, refractory ligand. While the standard model overestimates the surface dFe concentration, a 10‐time stronger biological uptake run causes a slight reduction in the model surface dFe. A tenfold decrease in the binding strength of the refractory ligand, suggested by recent observations, starts reproducing the observed dFe pattern, with a potential impact for the global nutrient distribution. An extreme value for the lithogenic scavenging rate can also match the model dFe with observations, but this process is still poorly constrained.
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