Trace metal fractional solubility in size-segregated aerosols from the tropical eastern Atlantic Ocean
Trace metal fractional solubility in size-segregated aerosols from the tropical eastern Atlantic Ocean
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热带东大西洋按尺寸分离的气溶胶中痕量金属的溶解度分数
DOI：
10.1002/essoar.10501469.1
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Baker A
中科院分区：
文献类型：
--
作者：
Baker A
可溶性和总微量金属测量四个大小分级收集在热带东大西洋的气溶胶样品。在以撒哈拉尘埃为主的样本中，总铁、铝、钛、锰、钴和钍的粒度分布彼此非常相似，并且与可溶性锰、钴和钍的粒度分布非常相似。较细的颗粒（< ~3 μm）显示铁、铝和钛的可溶性浓度增加，这可能是大气传输过程中与酸性硫酸盐气溶胶相互作用的结果。这两组元素之间的细微颗粒溶解度的差异可能与铁和一些其他元素的溶解度分数的双曲线增加有关，在撒哈拉沙尘的大气传输过程中，锰及其相关元素没有观察到。与在大气迁移过程中溶解度不同的元素相比，钍部分溶解度的稳定性应减少将海水中该元素的溶解浓度用作尘埃沉积的替代指标时的不确定性，但这一专题需要进一步开展工作。
Soluble and total trace metals were measured in four size fractionated aerosol samples collected over the tropical eastern Atlantic Ocean. In samples that were dominated by Saharan dust, the size distributions of total iron, aluminum, titanium, manganese, cobalt, and thorium were very similar to one another and to the size distributions of soluble manganese, cobalt, and thorium. Finer particle sizes (< ~3 μm) showed enhanced soluble concentrations of iron, aluminum, and titanium, possibly as a result of interactions with acidic sulfate aerosol during atmospheric transport. The difference in fine particle solubility between these two groups of elements might be related to the hyperbolic increase in the fractional solubility of iron, and a number of other elements, during the atmospheric transport of Saharan dust, which is not observed for manganese and its associated elements. In comparison to elements whose solubility varies during atmospheric transport, the stability of thorium fractional solubility should reduce uncertainties in the use of dissolved concentrations of this element in seawater as a proxy for dust deposition, although this topic requires further work.