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首页> 外文期刊>Geophysical Research Letters >Does a theoretical estimation of the dust size distribution at emission suggest more bioavailable iron deposition?
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Does a theoretical estimation of the dust size distribution at emission suggest more bioavailable iron deposition?

机译：从理论上估算排放时的粉尘尺寸分布是否表明更多的生物利用铁沉积？

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Global models have been used to deduce atmospheric iron supply to the ocean, but the uncertainty remains large. We used a global chemical transport model to investigate the effect of the estimated size distribution of dust on the bioavailable iron deposition. Simulations are performed with six different size distributions for dust aerosols at emission using similar aerosol optical depths (AODs) to constrain the total emission flux of dust. The global dust emission rate using a recent theoretical estimate for the dust size distribution at emission (2116 Tg yr ~(-1)) is about two times larger than the average of estimates using the other four empirical size distributions (1089 469 Tg yr ~(-1)). In contrast to the large differences in total emissions, the emission of fine dust (diameter < 2.5 m) is relatively robust (176 34 Tg yr ~(-1)), due to the strong constraint of AOD on fine dust emission. Our model results indicate that soluble iron (SFe) deposition is relatively invariant to the dust size distribution at emission in regions where most soluble iron is provided by acid mobilization of fine dust. In contrast, the use of the theoretical size distribution suggests a larger deposition of SFe (by a factor of 1.2 to 5) in regions where the concentration of acidic gases is insufficient to promote iron dissolution in dust particles, such as the South Atlantic. These results could have important implications for the projection of marine ecosystem feedbacks to climate change and highlight the necessity to improve the dust size distribution.
机译：全球模型已经被用来推断大气中向海洋的铁供应，但是不确定性仍然很大。我们使用了一种全球化学迁移模型来研究估计的尘埃大小分布对生物利用铁沉积的影响。使用相似的气溶胶光学深度（AOD）对排放时的粉尘气溶胶进行了六种不同尺寸分布的模拟，以约束粉尘的总排放通量。使用最新理论估算的排放时尘埃尺寸分布（2116 Tg yr〜（-1）），全球尘埃排放率大约是使用其他四个经验尺寸分布（1089 469 Tg yr〜）的平均值的两倍。 （-1））。与总排放量的巨大差异相反，由于AOD对微尘排放的强烈限制，微尘（直径<2.5 m）的排放相对稳定（176 34 Tg yr〜（-1））。我们的模型结果表明，在大多数可溶性铁是由细粉尘的酸动作用提供的区域，可溶性铁（SFe）的沉积相对于排放处的粉尘尺寸分布相对不变。相反，理论尺寸分布的使用表明，在酸性气体浓度不足以促进铁在尘粒中溶解的区域（例如南大西洋），SFe的沉积量较大（约为1.2至5）。这些结果可能对预测海洋生态系统对气候变化的反馈具有重要意义，并强调改善粉尘粒径分布的必要性。

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