Size-segregated water-soluble N-bearing species in the land-sea boundary zone of East China
Size-segregated water-soluble N-bearing species in the land-sea boundary zone of East China
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中国东部海陆交界带水溶性含氮物种的尺寸分离
DOI：
10.1016/j.atmosenv.2019.116990
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发表时间：
2019-12
影响因子：
5
通讯作者：
Chen Jianmin
中科院分区：
文献类型：
--
作者：
Li Rui;Cui Lulu;Zhao Yilong;Fu Hongbo;Li Qing;Zhang Liwu;Chen Jianmin
在中国东部海陆交界区（东海近海）采集了不同粒径的气溶胶样品，测定了水溶性无机氮（WSIN）、水溶性有机氮（WSON）、尿素和游离氨基酸（FAA）的浓度，定量分析了它们的来源，并估算了它们的干沉降通量。结果表明，总悬浮颗粒物（TSP）中水溶性氮、水溶性氮、尿素和游离氨基酸的平均浓度分别为547.14 nmol/m3、258.64 nmol/m3、12.69 nmol/m3和2589.03 pmol/m3。TSP中的WSIN、WSON和尿素浓度在SL 1和SL 4航线表现出明显的空间变异性，而在SL 3和SL 5航线表现出较低的浓度。大陆的生物质燃烧和化肥施用为近海地区的WSIN、WSON和尿素提供了重要的前体。此外，O3相关的光化学过程也促进了这些物种的次生形成。与此相反，这些人为源在相对偏远的海洋区域（SL 5）发挥的作用较小。值得注意的是，SL 5期间的总FAAs并未显示出最低浓度，这可能是由于海面上的气泡破裂和细菌释放所致。正矩阵因子分析（PMF）表明，施肥和次生物质是土壤水分净含量（35.54%和27.53%）和土壤水分净含量（43.07%和40.46%）的重要来源。而施肥和燃烧源对尿素（65.93%和19.13%）和游离氨基酸（51.35%和16.35%）的影响最大。ECS近海海域的WSIN、WSON、尿素和FAA的平均干沉降通量分别为206763.57 nmol m−2d−1、103763.07 nmol m−2d−1、4746.20 nmol m−2d−1和1047.08 nmol m−2d−1。研究结果表明，海陆边界带的大气含氮颗粒物受到陆地输送和海洋生物释放的共同影响。
Size-segregated aerosol samples were collected in the land-sea boundary zone of East China, the offshore area of East China Sea (ECS), to determine the concentrations of water-soluble inorganic nitrogen (WSIN), water-soluble organic nitrogen (WSON), urea, and free amino acids (FAAs), to quantify their sources, and to estimate their dry deposition fluxes. The results indicated that the mean concentrations of WSIN, WSON, urea, and FAAs in total suspended particle (TSP) were 547.14 nmol/m3, 258.64 nmol/m3, 12.69 nmol/m3, and 2589.03 pmol/m3, respectively. The WSIN, WSON, and urea concentrations in TSP showed remarkably spatial variation with the higher one during the shipping line (SL) 1 and SL4, while they exhibited the lower ones during SL3 and SL5. The biomass burning and fertilizer application in the continent provided important precursors for WSIN, WSON, and urea in the offshore areas. Besides, O3-related photochemical process also promoted the secondary formation of these species. In contrast, these anthropogenic sources played the minor roles on the relatively remote marine region (SL5). It was interesting to note that the total FAAs during SL5 did not show the lowest concentration, which might be contributed by the bubble bursting on the sea surface and the release of bacteria. The Positive Matrix Factorization (PMF) method identified fertilizer application and secondary formation were important sources for WSIN (35.54% and 27.53%) and WSON (43.07% and 40.46%), respectively. However, fertilizer application and combustion sources played the crucial important roles on urea (65.93% and 19.13%) and FAAs (51.35% and 16.35%). The mean dry deposition fluxes of WSIN, WSON, urea, and FAAs in the ECS offshore area were 206763.57 nmol m−2d−1, 103763.07 nmol m−2d−1, 4746.20 nmol m−2d−1, and 1047.08 nmol m−2d−1, respectively. The present study revealed that the ambient N-bearing particles in the land-sea boundary zone suffered from the combined effects of continental transport and the release of marine organisms.
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DOI：
10.1111/j.1600-0889.2007.00315.x
发表时间：
2008-01
期刊：
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影响因子：
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