On the origin of the marine zinc–silicon correlation

作者: Gregory F. de Souza , Samar P. Khatiwala , Mathis P. Hain , Susan H. Little , Derek Vance

DOI: 10.1016/J.EPSL.2018.03.050

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摘要: Abstract The close linear correlation between the distributions of dissolved zinc (Zn) and silicon (Si) in seawater has puzzled chemical oceanographers since its discovery almost forty years ago, due to apparent lack a mechanism for coupling these two nutrient elements. Recent research shown that such can be produced an ocean model without any explicit Zn Si, via export Zn-rich biogenic particles Southern Ocean, consistent with observation elevated quotas Ocean diatoms. Here, we investigate physical biological mechanisms by which uptake control large-scale marine distribution, using suites sensitivity simulations general circulation (OGCM) box-model ensemble. These focus on distribution stoichiometry relative phosphate (PO4), drawing directly observations culture. Our analysis reveals OGCM variants produce well-defined step relatively constant, high Zn:PO4 ratios low at lower latitudes fare best reproducing Zn–Si both global regional scale, suggesting presence distinct Zn-biogeochemical regimes high- low-latitude oceans may relate differences physiology, ecology or (micro-)nutrient status. Furthermore, study systematics box exerts over modulation biogeochemical characteristics surface Ocean. Specifically, near-complete depletion Si-poor Subantarctic Zone, where upper-ocean water masses key roles oceanic are formed. By setting main preformed covariation trend within interior, subduction Zn- produces Si is barely altered their differential remineralisation during cycling. We speculate analogous processes high-latitude operate other trace metal micronutrients as well, splitting into fundamentally different biogeochemical, thus biogeographic, regimes.

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