Anthropogenic emission is an important component of the present-day iron cycle yet its long-term impacts on climate are poorly understood. Iron mineralogy strongly affects its radiative and oceanic interactions and was unrepresented in previous studies. We perform simulations using a mineralogy-based inventory and an atmospheric transport model and estimate the 1850–2010 global mean direct radiative forcing (DRF) to be +0.02 to +0.10 W/m². We estimate that the CO₂ sequestration of 0.2–13 ppmv over the last 150 years due to enhanced phytoplankton productivity by anthropogenic iron deposition causes an avoided CO₂ forcing of −0.002 to −0.16 W/m². While globally small, these impacts can be higher in specific regions; the anthropogenic DRF is +0.5 W/m² over areas with more coal combustion and metal smelting, and anthropogenic soluble iron sustains >10% of marine net primary productivity in the high-latitude North Pacific Ocean, a region vulnerable to stratification due to climate change.

中文翻译：

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大气辐射和海洋生物生产力对 1850-2010 年期间人为燃烧铁排放增加的响应

人为排放是当今铁循环的重要组成部分，但人们对其对气候的长期影响却知之甚少。铁矿物学强烈影响其辐射和海洋相互作用，并且在以前的研究中没有得到体现。我们使用基于矿物学的清单和大气传输模型进行模拟，估计 1850-2010 年全球平均直接辐射强迫 (DRF) 为 +0.02 至 +0.10 W/m ²。我们估计，在过去 150 年中，由于人为铁沉积提高了浮游植物的生产力， CO ₂封存量为 0.2-13 ppmv，从而避免了 -0.002 至 -0.16 W/m ^{2的 CO} _2强迫. 虽然在全球范围内很小，但这些影响在特定地区可能更大；在煤炭燃烧和金属冶炼较多的地区，人为 DRF 为 +0.5 W/m ²，人为可溶性铁维持高纬度北太平洋海洋净初级生产力的 10% 以上，该地区易受气候分层影响改变。