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Can ocean iron fertilization mitigate ocean acidification? A letter

机译：海洋铁肥可以减轻海洋酸化吗？一封信

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摘要

Ocean iron fertilization has been proposed as a method to mitigate anthropogenic climate change, and there is continued commercial interest in using iron fertilization to generate carbon credits. It has been further speculated that ocean iron fertilization could help mitigate ocean acidification. Here, using a global ocean carbon cycle model, we performed idealized ocean iron fertilization simulations to place an upper bound on the effect of iron fertilization on atmospheric CO2 and ocean acidification. Under the IPCC A2 CO2 emission scenario, at year 2100 the model simulates an atmospheric CO2 concentration of 965 ppm with the mean surface ocean pH 0.44 units less than its pre-industrial value of 8.18. A globally sustained ocean iron fertilization could not diminish CO2 concentrations below 833 ppm or reduce the mean surface ocean pH change to less than 0.38 units. This maximum of 0.06 unit mitigation in surface pH change by the end of this century is achieved at the cost of storing more anthropogenic CO2 in the ocean interior, furthering acidifying the deep-ocean. If the amount of net carbon storage in the deep ocean by iron fertilization produces an equivalent amount of emission credits, ocean iron fertilization further acidifies the deep ocean without conferring any chemical benefit to the surface ocean.
机译：已经提出海洋铁肥作为减轻人为气候变化的一种方法，并且在使用铁肥产生碳信用额方面一直有商业利益。进一步推测，海洋铁肥可以帮助减轻海洋酸化。在这里，我们使用全球海洋碳循环模型进行了理想化的海洋铁肥模拟，以设定铁肥对大气CO 2 和海洋酸化的影响的上限。在IPCC A2 CO 2 排放情景下，到2100年，该模型模拟的大气CO 2 浓度为965 ppm，平均表面海洋pH值比其前期低0.44个单位。工业价值8.18。全球范围内持续的海洋铁肥不能降低CO 2 的浓度低于833 ppm，也不能将平均海洋表面pH值变化降低到小于0.38单位。到本世纪末，表面pH值变化最大可减少0.06个单位，这是以在海洋内部存储更多人为的CO 2 为代价的，从而进一步深化了深海。如果通过铁肥在深海中的净碳储量产生等量的排放信用，那么海洋铁肥会进一步酸化深海，而不会给表层海洋带来任何化学好处。

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