Arctic haze has attracted considerable scientific interest for decades. However, limited studies have focused on the molecular composition of atmospheric particulate matter that contributes to Arctic haze. Our study collected atmospheric particles at Alert in the Canadian high Arctic from mid-February to early May 2000. Over 100 organic species were identified in the solvent-extractable fraction by gas chromatography–mass spectrometry, which were grouped by their functional groups. Plasticizer-derived phthalates were the most abundant, followed by polyacids, sugars, sugar alcohols, biogenic SOA tracers, and fossil fuel combustion tracers. During the dark winter, major contributors to Arctic aerosols include plastic emissions, biomass burning, secondary oxidation products, and fossil fuel combustion products. In the light spring, phthalates (58–76% of the identified organics) dominated, followed by microbial and marine sources and secondary oxidation products. By employing a tracer-based method, we discovered that naphthalene and sesquiterpene oxidation products were the major contributors to SOC, and these contributions were much higher in the winter than in the spring. However, monoterpene and isoprene oxidation products peaked in light spring. Our results confirm that organic aerosols in the Arctic atmosphere are dominated by anthropogenic sources, which consist of both long-range-transported particles and combustion-emitted organics, as well as aged anthropogenic secondary organic aerosols. Despite decreasing anthropogenic pollution being replaced by natural emissions, plastic-derived pollution, represented by phthalates, increased significantly in the high Arctic atmosphere after the polar sunrise.

中文翻译：

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Light Spring 中高北极气溶胶中塑料排放的优势


几十年来，北极的雾霾一直引起了科学界的极大兴趣。然而，有限的研究集中在导致北极雾霾的大气颗粒物的分子组成上。我们的研究从 2000 年 2 月中旬到 5 月初在加拿大高北极的 Alert 收集了大气颗粒。通过气相色谱-质谱法在溶剂可萃取馏分中鉴定出 100 多种有机物种，并按其官能团分组。增塑剂衍生的邻苯二甲酸酯含量最高，其次是多酸、糖、糖醇、生物 SOA 示踪剂和化石燃料燃烧示踪剂。在黑暗的冬天，北极气溶胶的主要贡献者包括塑料排放、生物质燃烧、二次氧化产物和化石燃料燃烧产物。在浅色泉水中，邻苯二甲酸盐（占已鉴定有机物的 58-76%）占主导地位，其次是微生物和海洋来源以及二次氧化产物。通过采用基于示踪剂的方法，我们发现萘和倍半萜氧化产物是 SOC 的主要贡献者，并且这些贡献在冬季远高于春季。然而，单萜和异戊二烯氧化产物在浅春季达到顶峰。我们的结果证实，北极大气中的有机气溶胶以人为来源为主，其中包括远程传输的颗粒和燃烧排放的有机物，以及老化的人为二次有机气溶胶。尽管自然排放物取代了减少的人为污染，但以邻苯二甲酸盐为代表的塑料衍生污染在极地日出后在北极高海拔大气中显着增加。