Atmospheric supply of iron can modulate ocean biogeochemistry, due to its key role in global nitrogen and carbon cycles. Current estimates predict up to 20% of global ocean net primary productivity depends on an atmospheric iron source. Using a technology‐based methodology, we revise total and soluble anthropogenic iron emissions and resolve iron into its mineral components, which allows modeling mineral‐specific atmospheric reactions. We compare different methodologies for representing anthropogenic iron solubility: measured in mild and strong leaches and estimated using a mineralogy basis and identify the emissions that are most affected by such assumptions. The inclusion of metal smelting as an iron source increases iron emissions by up to 10 times higher in the fine aerosol fraction (smaller than 1 μm) than most previous inventories. Different solubility assumptions alter anthropogenic soluble iron emissions and deposition by a factor of 20 and 10, respectively. Using solubilities measured in mild leaches and calculated by mineralogy give 20–30 Gg/yr anthropogenic emissions and 40–50 Gg/yr deposition, while those measured in strong leaches give 80–440 Gg/yr emissions and 200–450 Gg/yr deposition. This range of anthropogenic soluble iron deposition leads to global soluble iron deposition of 1,900–2,300 Gg/yr when dust, wildfires, and atmospheric processing are included, indicating such assumptions can affect global soluble iron supply by about 30%. In regions where marine primary productivity is iron limited, anthropogenic combustion‐iron contributes up to half of the atmospheric soluble iron flux to the North Pacific Ocean but supplies less than 5% to the Southern Ocean.

中文翻译：

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基于矿物学的人为燃烧-铁排放清单

铁的大气供应可以调节海洋生物地球化学，这是由于铁在全球氮和碳循环中的关键作用。目前的估计预测，全球海洋净初级生产力的高达20％取决于大气中的铁源。我们采用基于技术的方法，修正了总的和可溶的人为铁排放量，并将铁分解为矿物成分，从而可以模拟特定矿物的大气反应。我们比较了代表人为铁溶解度的不同方法：在轻浸和强浸中进行测量，并使用矿物学基础进行估算，并确定受此类假设影响最大的排放物。包括金属冶炼作为铁源，使精细气溶胶分数（小于1μm）中的铁排放量比以前的大多数清单高出10倍。不同的溶解度假设分别将人为溶解性铁的释放量和沉积量改变了20倍和10倍。使用在轻度浸出中测得的溶解度并通过矿物学计算得出的人为排放量为20–30 Gg / yr，每年沉积40–50 Gg，而在强浸出物中测出的溶解度则为80–440 Gg / yr，每年沉积和200–450 Gg / yr 。当包括尘埃，野火和大气处理时，人为的可溶性铁沉积量范围导致全球可溶性铁沉积量为1,900–2,300 Gg / yr，这表明此类假设可影响全球可溶性铁量约30％。在海洋初级生产力受到铁限制的地区，人为燃烧铁占北太平洋的大气可溶性铁通量的一半，而向南大洋的供应少于5％。