Institute of Marine Sciences, 1156 High Street, University of California-Santa Cruz, Santa Cruz, California 95064, United States.
Environ Sci Technol. 2011 Dec 1;45(23):9874-82. doi: 10.1021/es2020428. Epub 2011 Nov 8.
Recent trends of atmospheric lead deposition to the North Pacific were investigated with analyses of lead in aerosols and surface waters collected on the fourth Intergovernmental Oceanographic Commission Contaminant Baseline Survey from May to June, 2002. Lead concentrations of the aerosols varied by 2 orders of magnitude (0.1-26.4 pmol/m(3)) due in part to variations in dust deposition during the cruise. The ranges in lead aerosol enrichment factors relative to iron (1-119) and aluminum (3-168) were similar, evidencing the transport of Asian industrial lead aerosols across the North Pacific. The oceanic deposition of some of those aerosols was substantiated by the gradient of lead concentrations of North Pacific waters, which varied 3-fold (32.7-103.5 pmol/kg), were highest along with the Asian margin of the basin, and decreased eastward. The hypothesized predominance of Asian industrial lead inputs to the North Pacific was further corroborated by the lead isotopic composition of ocean surface waters ((206)Pb/(207)Pb = 1.157-1.169; (208)Pb/(206)Pb = 2.093-2.118), which fell within the range of isotopic ratios reported in Asian aerosols that are primarily attributed to Chinese industrial lead emissions.
利用 2002 年 5 月至 6 月期间在第四次政府间海洋学委员会污染物基线调查中收集的气溶胶和地表水样本中的铅进行分析，研究了大气铅向北太平洋的沉积的近期趋势。由于在航行过程中灰尘沉积的变化，气溶胶中的铅浓度变化了两个数量级（0.1-26.4 pmol/m3）。相对于铁（1-119）和铝（3-168）的铅气溶胶富集因子的范围相似，这表明亚洲工业铅气溶胶跨越北太平洋的传输。北太平洋水域铅浓度的梯度证实了其中一些气溶胶的海洋沉积，这些浓度变化了三倍（32.7-103.5 pmol/kg），在与亚洲边缘的盆地中最高，并向东减少。海洋表层水的铅同位素组成（(206)Pb/(207)Pb = 1.157-1.169；(208)Pb/(206)Pb = 2.093-2.118）进一步证实了亚洲工业铅输入北太平洋的假设占主导地位，这些比值落在亚洲气溶胶中报告的同位素比值范围内，主要归因于中国工业铅排放。
