Recent (1980 to 2015) Trends and Variability in Daily-to-Interannual Soluble Iron Deposition from Dust, Fire, and Anthropogenic Sources
Recent (1980 to 2015) Trends and Variability in Daily-to-Interannual Soluble Iron Deposition from Dust, Fire, and Anthropogenic Sources
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DOI：
10.1029/2020gl089688
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发表时间：
2020-09-16
影响因子：
5.2
通讯作者：
Mahowald, Natalie M.
中科院分区：
文献类型：
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作者：
Hamilton, Douglas S.;Scanza, Rachel A.;Mahowald, Natalie M.
铁循环是地球系统的关键组成部分。然而，大气中可溶（生物可及）铁进入海洋的通量有多大的变化，以及这种变化如何受到人类活动和气候变化的调节，目前尚不清楚。我们首次描述了卫星时代（1980年至2015年）每日至年际模拟的热源（火灾和人为燃烧）和粉尘源的可溶性铁排放和沉积变化。统计上存在显著的排放趋势：尘铁减少，火铁略有增加，人为铁增加。在大多数地区，尘铁在绝对沉积量中占主导地位，火铁在绝对沉积量中占重要地位，人为铁在绝对沉积量中有显著的增加趋势。量化来自所有主要铁源（不仅仅是灰尘）的可溶性铁的日至年际沉积变化，将推进海洋生物地球化学变化的量化，以应对人类对地球系统的持续扰动。
The iron cycle is a key component of the Earth system. Yet how variable the atmospheric flux of soluble (bioaccessible) iron into oceans is, and how this variability is modulated by human activity and a changing climate, is not well known. For the first time, we characterize Satellite Era (1980 to 2015) daily-to-interannual modeled soluble iron emission and deposition variability from both pyrogenic (fires and anthropogenic combustion) and dust sources. Statistically significant emission trends exist: dust iron decreases, fire iron slightly increases, and anthropogenic iron increases. A strong temporal variability in deposition to ocean basins is found, and, for most regions, dust iron dominates the absolute deposition magnitude, fire iron is an important contributor to temporal variability, and anthropogenic iron imposes a significant increasing trend. Quantifying soluble iron daily-to-interannual deposition variability from all major iron sources, not only dust, will advance quantification of changes in marine biogeochemistry in response to the continuing human perturbation to the Earth System.