We investigated the climatological‐scale, monthly binned, seasonal variation of AERONET/Dubovik retrievals across six stations in the North American and European Arctic (multiyear sampling periods ranging from 8 to 17 years). A robust, spring‐to‐summer (StoS) increase in the radius of the peak of the fine mode (FM) component of the particle size distribution (PSD) was observed for five of the six stations. The FM aerosol optical depth (AOD) and the FM effective radius at the individual stations showed, respectively, a negligible to moderate StoS decrease and a significant increase. This was interpreted as a trade‐off between the waning influence of smaller FM Arctic haze aerosols and the increasing influence of large FM smoke particles. A springtime, pan‐Arctic PSD peak in the 1.3 μm coarse mode (CM) bin was attributed to Asian dust. It was suggested that the increase in amplitude of a second (4–7 μm) CM peak from July to August at the low‐elevation coastal sites was influenced by wind‐induced sea salt. The CM AOD went through a StoS decrease attributed to the decreasing amplitude of the 1.3 μm peak. A significant StoS CM effective radius increase was ascribed to the decreasing influence of the 1.3 μm peak. StoS FM fraction increases were largely due to the decrease of the CM AOD (decreasing influence of springtime Asian dust). This extensive and intensive climatology of remotely sensed, bimodal properties will, we believe, provide an important reference for future measurements and modeling of Arctic aerosols.

中文翻译：

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从北极的AERONET检索得出的密集和半密集气溶胶参数的气候尺度分析

我们调查了北美和欧洲北极地区六个站点（多年采样期从8到17年不等）的AERONET / Dubovik气藏的气候尺度，月分时段，季节性变化。在六个站点中的五个站点中，观察到了粒径分布（PSD）的精细模式（FM）分量的峰半径的强劲的春季至夏季（StoS）增加。各个站点的FM气溶胶光学深度（AOD）和FM有效半径分别显示出可忽略不计的StoS减少和显着增加。这被解释为在较小的FM北极雾霾气雾的减弱影响与较大的FM烟尘颗粒的增加影响之间的权衡。在1.3μm粗模式（CM）箱中出现了春季的全北极PSD峰，其原因是亚洲尘埃。有人提出，低海拔沿海地区从7月到8月，第二个CM峰（4-7μm）的振幅增加受到风致海盐的影响。CM AOD经历了StoS下降，这归因于1.3μm峰幅度的减小。StoS CM有效半径的显着增加归因于1.3μm峰的减小影响。StoS FM分数的增加主要是由于CM AOD的减少（春季亚洲尘埃影响的减小）。我们认为，这种广泛而密集的遥感双峰性质气候将为今后的北极气溶胶测量和建模提供重要参考。CM AOD经历了StoS下降，这归因于1.3μm峰幅度的减小。StoS CM有效半径的显着增加归因于1.3μm峰的减小影响。StoS FM分数的增加主要是由于CM AOD的减少（春季亚洲尘埃影响的减小）。我们相信，这种广泛而密集的遥感双峰特性气候将为将来的北极气溶胶测量和建模提供重要参考。CM AOD经历了StoS下降，这归因于1.3μm峰幅度的减小。StoS CM有效半径的显着增加归因于1.3μm峰的减小影响。StoS FM分数的增加主要是由于CM AOD的减少（春季亚洲尘埃影响的减小）。我们认为，这种广泛而密集的遥感双峰性质气候将为今后的北极气溶胶测量和建模提供重要参考。