Dicarboxylic acids in the Arctic aerosols and snowpacks collected during ALERT 2000
Dicarboxylic acids in the Arctic aerosols and snowpacks collected during ALERT 2000
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DOI：
10.1016/s1352-2310(02)00126-7
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发表时间：
2002-05
影响因子：
5
通讯作者：
M. Narukawa;K. Kawamura;Shao-Meng Li;J. Bottenheim
中科院分区：
文献类型：
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作者：
M. Narukawa;K. Kawamura;Shao-Meng Li;J. Bottenheim
饱和（C2-C11）和不饱和（C4-C5，C8）二羧酸测定北极气溶胶和表面积雪样品收集在黑暗的冬季（2月）和春季（4月至5月）使用气相色谱和气相色谱/质谱。其分子分布的特点是草酸（C2）的优势，除了少数春季积雪样品，表现出优势的琥珀酸（C4）。从冬季到春季，气溶胶样品中短链饱和二酸（C3-C5）和4-酮庚二酸的浓度增加了1.55倍。与此相反，饱和C6-C11二酸和不饱和（马来酸，甲基马来酸和邻苯二甲酸）酸从冬季到春季的气溶胶样品减少了0.04倍。积雪样本也显示出类似的趋势。这些气溶胶样本的结果表明，二酸主要是在春季通过碳氢化合物和其他前体的光化学氧化产生的，这些前体从中低纬度长距离输送到北极，但草酸的产生部分地被可能与溴化学有关的光致降解所抵消。
Saturated (C2–C11) and unsaturated (C4–C5, C8) dicarboxylic acids were measured in Arctic aerosol and surface snowpack samples collected during dark winter (February) and light spring (April–May) using a gas chromatography and gas chromatography/mass spectrometry. Their molecular distributions were characterized by a predominance of oxalic acid (C2), except for few spring snowpack samples that showed the predominance of succinic acid (C4). Concentrations of short-chain saturated diacids (C3–C5) and 4-ketopimelic acid in the aerosol samples increased by a factor of ∼5 from winter to spring. In contrast, those of saturated C6–C11diacids and unsaturated (maleic, methylmaleic and phthalic) acids decreased by a factor of ∼4 from winter to spring aerosol samples. Snowpack samples also showed a similar trend. These results of the aerosol samples suggested that, the diacids are largely produced in spring by photochemical oxidation of hydrocarbons and other precursors that are transported long distances from the mid- and low-latitudes to the Arctic, but the production of oxalic acid is in part counteracted by photo-induced degradation possibly associated with bromine chemistry.