Water-soluble organic nitrogen in Amazon Basin aerosols during the dry (biomass burning) and wet seasons
Water-soluble organic nitrogen in Amazon Basin aerosols during the dry (biomass burning) and wet seasons
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DOI：
10.1029/2003jd003557
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发表时间：
2003-08-27
影响因子：
4.4
通讯作者：
Duce, RA
中科院分区：
文献类型：
--
作者：
Mace, KA;Artaxo, P;Duce, RA
作为亚马逊大尺度生物圈-大气试验（LBA）的一部分，在1999年湿季和干季（生物质燃烧）收集了PM10气溶胶，分析了总水溶性有机氮（WSON）、尿素和17种氨基酸。除总WSON外，还分析了硝态氮（NO3-）、亚硝酸盐（NO2-）和铵态氮（NH4+）。发现WSON分别代表湿季和干季气溶胶样品中总氮的45%（平均浓度接近3.5 nmol N/m(3)）和43%（平均浓度接近61 nmol N/m(3)）。旱季气溶胶中尿素和氨基氮约占总有机氮的19%，雨季气溶胶中尿素和氨基氮约占总有机氮的2.5%；大部分WSON（旱季约为80%，雨季约为97%）仍然没有特征。研究结果表明，生物质燃烧是WSON的一个来源，但人们对其知之甚少（因为该数据集代表了在生物质燃烧背景下对WSON的首次研究）。未来的研究需要确定全球生物质燃烧释放的WSON的大小，其物种组成及其生物地球化学意义。
[1] As part of the Large-Scale Biosphere-Atmosphere Experiment in Amazonia (LBA), PM10 aerosol was collected during both the wet and dry (biomass burning) seasons of 1999 and analyzed for total water-soluble organic nitrogen (WSON), urea, and 17 amino acids. In addition to total WSON the inorganic N species nitrate (NO3-), nitrite (NO2-), and ammonium (NH4+) were also analyzed. WSON was found to represent similar to45% (mean concentration similar to3.5 nmol N/m(3)) and similar to43% (mean concentration similar to61 nmol N/m(3)) of the total N in wet and dry season aerosol samples, respectively. Urea and amino N made up similar to19% of the total organic N in dry season aerosols and similar to2.5% of the total organic N in wet season aerosols; the majority of WSON, similar to80% in the dry season and similar to97% in the wet season, remained uncharacterized. The results suggest that biomass burning is a source of WSON, yet poorly understood ( since this data set represents the first study of WSON in the context of biomass burning). Future studies aimed at determining the magnitude of WSON released from biomass burning globally, its species composition, and its biogeochemical significance are needed.