Seasonal dynamics of airborne biomolecules influence the size distribution of Arctic aerosols

IF 14 1区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Environmental Science and Ecotechnology Pub Date : 2024-07-18 DOI:10.1016/j.ese.2024.100458
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Abstract

Organic matter is crucial in aerosol–climate interactions, yet the physicochemical properties and origins of organic aerosols remain poorly understood. Here we show the seasonal characteristics of submicron organic aerosols in Arctic Svalbard during spring and summer, emphasizing their connection to transport patterns and particle size distribution. Microbial-derived organic matter (MOM) and terrestrial-derived organic matter (TOM) accounted for over 90% of the total organic mass in Arctic aerosols during these seasons, comprising carbohydrate/protein-like and lignin/tannin-like compounds, respectively. In spring, aerosols showed high TOM and low MOM intensities due to biomass-burning influx in the central Arctic. In contrast, summer exhibited elevated MOM intensity, attributed to the shift in predominant atmospheric transport from the central Arctic to the biologically active Greenland Sea. MOM and TOM were associated with Aitken mode particles (<100 nm diameter) and accumulation mode particles (>100 nm diameter), respectively. This association is linked to the molecular size of biomolecules, impacting the number concentrations of corresponding aerosol classes. These findings highlight the importance of considering seasonal atmospheric transport patterns and organic source-dependent particle size distributions in assessing aerosol properties in the changing Arctic.

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空气中生物大分子的季节性动态影响北极气溶胶的大小分布
有机物在气溶胶与气候的相互作用中至关重要,但人们对有机气溶胶的物理化学特性和来源仍然知之甚少。在这里,我们展示了北极斯瓦尔巴群岛春夏季亚微米有机气溶胶的季节性特征,强调了它们与传输模式和粒径分布的联系。在这些季节中,微生物衍生有机物(MOM)和陆地衍生有机物(TOM)占北极气溶胶中有机物总量的 90% 以上,分别由碳水化合物/蛋白质类化合物和木质素/单宁类化合物组成。春季,由于北极中部生物质燃烧的涌入,气溶胶显示出较高的 TOM 强度和较低的 MOM 强度。相比之下,夏季的 MOM 强度较高,这是因为主要的大气传输从北极中部转移到了生物活跃的格陵兰海。MOM 和 TOM 分别与艾特肯模式颗粒(直径 100 nm)和累积模式颗粒(直径 100 nm)有关。这种关联与生物分子的分子大小有关,会影响相应气溶胶类别的数量浓度。这些发现突出表明,在评估不断变化的北极地区的气溶胶特性时,考虑季节性大气传输模式和取决于有机源的颗粒大小分布非常重要。
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来源期刊
CiteScore
20.40
自引率
6.30%
发文量
11
审稿时长
18 days
期刊介绍: Environmental Science & Ecotechnology (ESE) is an international, open-access journal publishing original research in environmental science, engineering, ecotechnology, and related fields. Authors publishing in ESE can immediately, permanently, and freely share their work. They have license options and retain copyright. Published by Elsevier, ESE is co-organized by the Chinese Society for Environmental Sciences, Harbin Institute of Technology, and the Chinese Research Academy of Environmental Sciences, under the supervision of the China Association for Science and Technology.
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