Atmospheric trace metal concentrations, solubility and deposition fluxes in remote marine air over the south-east Atlantic
Atmospheric trace metal concentrations, solubility and deposition fluxes in remote marine air over the south-east Atlantic
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DOI：
10.1016/j.marchem.2015.06.028
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发表时间：
2015-12-20
期刊：
影响因子：
3
通讯作者：
Baker, Alex R.
中科院分区：
文献类型：
--
作者：
Chance, Rosie;Jickells, Timothy D.;Baker, Alex R.
在东南大西洋的七次航行中收集的大气气溶胶和雨水样本中测定了总的和可溶的痕量金属浓度。回溯轨迹表明，这些样本都代表了遥远的海洋气团，与气候学的预期一致。气溶胶微量金属负载类似于以前的测量在清洁，海洋空气质量。Fe、Al、Mn、V、Co和Zn的总浓度中位数分别为206、346、5、3、0.7和11 pmol m（-3）。溶解度在操作上定义为使用pH 4.7醋酸铵浸出可提取的部分。可溶性Fe、Al、Mn、V、Co、Zn、Cu、Ni、Cd和Pb的中位浓度分别为6、55、1、0.7、0.06、24、2、1、0.05和0.3 pmol m（-3）。大范围内的分数溶解度观察到的所有元素，除钴，中位溶解度值为铁，铝和锰低于20%，而锌的中位数为74%。Fe、Al、Mn、V、Co、Zn、Cu、Ni、Cd和Pb的体积加权平均浓度分别为704、792、32、10、3、686、25、0.02、03和10 nmol L-1（n = 6）。从这些值计算的湿沉降通量表明，雨作出了显着的贡献，在研究区域的所有元素，也许除了镍的总沉积。(C)2015作者由爱思唯尔公司出版
Total and soluble trace metal concentrations were determined in atmospheric aerosol and rainwater samples collected during seven cruises in the south-east Atlantic. Back trajectories indicated that the samples all represented remote marine air masses, consistent with climatological expectations. Aerosol trace metal loadings were similar to previous measurements in clean, marine air masses. Median total Fe, Al, Mn, V, Co and Zn concentrations were 206, 346, 5, 3, 0.7 and 11 pmol m(-3) respectively. Solubility was operationally defined as the fraction extractable using a pH 4.7 ammonium acetate leach. Median soluble Fe, Al, Mn, V, Co, Zn, Cu, Ni, Cd and Pb concentrations were 6, 55, 1, 0.7, 0.06, 24, 2, 1, 0.05 and 0.3 pmol m(-3) respectively. Large ranges in fractional solubility were observed for all elements except Co; median solubility values for Fe, Al and Mn were below 20% while the median for Zn was 74%. Volume weighted mean rainwater concentrations were 704, 792, 32, 10, 3, 686, 25, 0.02, 03 and 10 nmol L-1 for Fe, Al, Mn, V, Co, Zn, Cu, Ni, Cd and Pb respectively (n = 6). Wet deposition fluxes calculated from these values suggest that rain makes a significant contribution to total deposition in the study area for all elements except perhaps Ni. (C) 2015 The Authors. Published by Elsevier B.V.