The impact of different external sources of iron on the global carbon cycle
The impact of different external sources of iron on the global carbon cycle
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DOI：
10.1002/2013gl059059
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发表时间：
2014-02
影响因子：
5.2
通讯作者：
A. Tagliabue;O. Aumont;L. Bopp
中科院分区：
文献类型：
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作者：
A. Tagliabue;O. Aumont;L. Bopp
海洋中铁的供应量变化经常被用来解释过去大气中二氧化碳（CO2atm）的变化。使用模型模拟，我们发现，CO2atm是敏感的顺序为15，2和1 ppm的沉积，灰尘，和热液铁输入。CO2atm对尘埃不敏感，因为它不是南大洋的主要铁输入。对Si（OH）4向低纬度地区的相对输出的修正与以前预测的相反。虽然热液作用是对约25%海洋中铁储量的主要控制，但它仍然局限于深海，对CO2atm的影响较小。然而，关于铁结合配体库的不确定性可能对CO2atm产生重大影响。作为GEOTRACES的一部分，正在进行的铁观测的扩展将对完善这些结果非常宝贵。
Variable supply of iron to the ocean is often invoked to explain part of past changes in atmospheric CO2 (CO2atm). Using model simulations, we find that CO2atm is sensitive on the order of 15, 2, and 1 ppm to sedimentary, dust, and hydrothermal iron input. CO2atm is insensitive to dust because it is not the major iron input to the Southern Ocean. Modifications to the relative export of Si(OH)4 to low latitudes are opposite to those predicted previously. Although hydrothermalism is the major control on the iron inventory in ~25% of the ocean, it remains restricted to the deep ocean, with minor effects on CO2atm. Nevertheless, uncertainties regarding the iron‐binding ligand pool can have significant impacts on CO2atm. Ongoing expansion of iron observations as part of GEOTRACES will be invaluable in refining these results.