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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Constraints on the globalmarine iron cycle from a simple inverse model
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Constraints on the globalmarine iron cycle from a simple inverse model

机译：简单逆模型对全球海洋铁循环的约束

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摘要

A simple model of the global marine iron cycle is used to constrain the sources, sinks, and biological cycling of iron. The iron model is embedded in a data-assimilated steady state circulation, with biological cycling driven by a prescribed, data-constrained phosphate cycle. Biogeochemical parameters are determined by minimizing a suitably weighted quadratic mismatch with available dissolved iron (dFe) observations, including GEOTRACES transects. Because the effective iron sources and sinks overlap, current dFe observations cannot constrain sources and sinks independently. We therefore determine a family of optimal solutions for a range of the aeolian source strength σ_A from 0.3 to 6.1 Gmol/yr. We find that the dFe observations constrain the maximum Fe:P uptake ratio R~0 to be proportional to σ_A, with a range that spans most available measurements. Thus, with either R~0 or σ_A specified, a unique solution is determined. Global inventories of total and free iron are well constrained at (7.4 ± 0.2) × 1011 and (1.39 ± 0.05) × 1010 mol Fe, respectively. The dFe distributions are very similar across the family of solutions, with iron limitation in the known high-nutrient low-chlorophyll regions. Hydrothermal source strength ranges from 0.57 to 0.73 Gmol/yr and does not vary systematically with σ_A suggesting that the hydrothermal and aeolian parts of the iron cycle are largely decoupled. The hydrothermal dFe anomaly in the euphotic zone is ～10% and concentrated in subpolar regions of iron limitation. Enhanced ligand concentrations in old waters and in hydrothermal plumes are necessary to capture key features of the dFe observations.
机译：使用全球海洋铁循环的简单模型来约束铁的来源，汇和生物循环。铁模型嵌入在数据辅助的稳态循环中，其中生物循环由规定的，数据受限的磷酸盐循环驱动。生物地球化学参数是通过使用合适的溶解铁（dFe）观测值（包括GEOTRACES样条）最小化适当加权的二次失配来确定的。由于有效的铁源和汇重叠，因此当前的dFe观测值无法独立约束源和汇。因此，我们确定了一系列针对0.3-6.1 Gmol / yr的风源强度σ_A的最佳解决方案。我们发现，dFe观测值将最大的Fe：P吸收比R〜0限制为与σ_A成正比，其范围跨越了大多数可用测量。因此，通过指定R〜0或σ_A，可以确定唯一解。总铁和游离铁的总库存分别限制在（7.4±0.2）×1011和（1.39±0.05）×1010 mol Fe。 dFe的分布在整个溶液系列中非常相似，在已知的高营养低叶绿素区域中铁含量受到限制。水热源的强度范围为0.57至0.73 Gmol / yr，并且没有随σ_A的变化而系统地变化，这表明铁循环的水热和风沙部分很大程度上分离了。富营养区的热液dFe异常约为〜10％，集中在铁限制的亚极区域。为了捕获dFe观测的关键特征，必须在老水和热液羽流中增加配体浓度。

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