Sources, solubility, and dry deposition of aerosol trace elements over the East China Sea
Sources, solubility, and dry deposition of aerosol trace elements over the East China Sea
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DOI：
10.1016/j.marchem.2008.10.003
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发表时间：
2010-06-20
期刊：
影响因子：
3
通讯作者：
Tseng, Chun-Mao
中科院分区：
文献类型：
--
作者：
Hsu, Shih-Chieh;Wong, George T. F.;Tseng, Chun-Mao
对2005年春季至2007年春季在东海海域采集的47个气溶胶样品进行了水溶性和总浓度的分析，分析了25种微量元素和磷以及水溶性主要离子、有机碳和硅的含量。在采样期间，有8个样本受到亚洲沙尘事件的显着影响。在亚洲沙尘期间，沙尘来源和人为来源的化学物质的总浓度较高，这表明亚洲的空气污染物外流往往伴随着亚洲沙尘平流。总的来说，Tl、Sr、As、Zn、Cd和Se的平均溶解度= 60%。沙尘暴期间许多元素的溶解度比东北季风污染期间和背景夏季低。讨论了影响元素溶解度的各种因素。其相对重要性大小依次为酸处理>接近气溶胶源的化学形态>粉尘负荷。最后，我们估计干沉积通量的可溶性元素，假设一定的干沉积速率为每个元素。可溶性铁的通量为39 +/- 50 μ g/m（2）/d，某些生物可利用元素的组合的通量为41 +/- 74 μ g/m（2）/d（例如，Zn、Cu、Mn、Ba、Co、V、Ni和Cd）。大气沉积是营养元素的另一个来源，不仅在沿海/边缘海可能很重要，而且在遥远的公海也特别重要，因为气溶胶微量元素大多与可以远离源区的细模式粒子有关。(C)2008 Elsevier B. V.保留所有权利。
A total of 47 marine aerosols collected from the East China Sea between the spring of 2005 and the spring of 2007 were analyzed for both the water-soluble and the total concentrations of 25 trace elements and phosphorus and the water-soluble major ions, organic carbon, as well as silicon. During the sampling periods, eight samples were significantly influenced by Asian dust events. The total concentrations of both the chemical species of dust origin and of anthropogenic origin were higher during the Asian dust period, suggesting that the Asian outflow of air pollutants often accompanies the Asian dust advection. Overall, the average solubilities were = 60% for Tl, Sr, As, Zn, Cd, and Se. The solubilities for many elements are lower in the high dust period than during the polluted northeasterly monsoon and the background summer period. A variety of controlling factors of the solubilities of the elements were discussed in this study. The relative importance could be concluded as follows: acid processing>chemical speciation approximate to aerosol source>dust loading. Finally, we estimated the dry depositional fluxes of soluble elements by assuming certain dry deposition velocities for each element. The fluxes were 39 +/- 50 mu g/m(2)/d for soluble Fe and 41 +/- 74 mu g/m(2)/d for the combination of some bioavailable elements (e.g., Zn, Cu, Mn, Ba, Co, V. Ni, and Cd) during the northeasterly monsoon. Atmospheric deposition is an additional source of nutrient elements that may be important not only in the coastal/marginal sea, but also particularly in the remote open ocean because aerosol trace elements are associated mostly with fine mode particles that can be brought farther from the source regions. (C) 2008 Elsevier B.V. All rights reserved.