Anhui Key Laboratory of Polar Environment and Global Change, Department of Environmental Science and Engineering, University of Science and Technology of China, Hefei, China; Suzhou Institute for Advanced Study, University of Science and Technology of China, Suzhou, China.
First Institute of Oceanography, and Key Laboratory of Marine Science and Numerical Modeling, Ministry of Natural Resources, Qingdao, China; Laboratory for Regional Oceanography and Numerical Modeling, Pilot National Laboratory for Marine Science and Technology, Qingdao, China; Shandong Key Laboratory of Marine Science and Numerical Modeling, Qingdao, China.
Sci Total Environ. 2022 Dec 20;853:158645. doi: 10.1016/j.scitotenv.2022.158645. Epub 2022 Sep 8.
Biogenic secondary organic aerosols (BSOA) are important components of the remote marine atmosphere. However, the response of BSOA changes to sea ice reduction over the Arctic Ocean remains unclear. Here we investigated isoprene and monoterpenes secondary organic aerosol (SOAI and SOAM) tracers in three years of summer aerosol samples collected from the Arctic Ocean atmosphere. The results indicated that methyltetrols were the most abundant SOAI tracers, while the main oxidation products of monoterpenes varied over the years owing to different aerosol aging. The results of the principal component analysis (PCA)-generalized additive model (GAM) combined with correlation analysis suggested that SOAI tracers were mainly generated by the oxidation of isoprene from marine emissions, while SOAM tracers were probably more influenced by terrestrial transport. Estimation of secondary organic carbon (SOC) indicated that monoterpenes oxidation contributed more than isoprene and that sea ice changes had a relatively small effect on biogenic SOC concentration levels. Our study quantified the contribution of influencing factors to the atmospheric concentration of BSOA tracers in the Arctic Ocean, and showed that there were differences in the sources of precursors for different BSOA. Hence, our findings have contributed to a better understanding of the characteristics, sources and formation of SOA in the atmosphere of the Arctic Ocean.
生物成因的二次有机气溶胶（BSOA）是远程海洋大气的重要组成部分。然而，北极海洋海冰减少对 BSOA 变化的响应仍不清楚。本研究在三年的夏季气溶胶样本中调查了来自北极海洋大气的异戊二烯和单萜二次有机气溶胶（SOAI 和 SOAM）示踪剂。结果表明，甲基四醇是最丰富的 SOAI 示踪剂，而单萜的主要氧化产物因气溶胶老化的不同而有所差异。主成分分析（PCA）-广义加性模型（GAM）与相关分析的结果表明，SOAI 示踪剂主要是由海洋排放的异戊二烯氧化产生的，而 SOAM 示踪剂可能更多地受到陆地运输的影响。对二次有机碳（SOC）的估计表明，单萜氧化的贡献大于异戊二烯，而且海冰变化对生物 SOC 浓度水平的影响相对较小。本研究量化了影响因素对北极海洋大气中 BSOA 示踪剂浓度的贡献，表明不同 BSOA 的前体物来源存在差异。因此，本研究结果有助于更好地理解北极海洋大气中 SOA 的特征、来源和形成。
