The atmospheric concentration of persistent organic pollutants (and of polycyclic aromatic hydrocarbons, PAHs, in particular) is closely related to climate change and climatic fluctuations, which are likely to influence contaminant’s transport pathways and transfer processes. Predicting how climate variability alters PAHs concentrations in the atmosphere still poses an exceptional challenge. In this sense, the main objective of this contribution is to assess the relationship between the North Atlantic Oscillation (NAO) index and the mean concentration of benzo[a]pyrene (BaP, the most studied PAH congener) in a domain covering Europe, with an emphasis on the effect of regional-scale processes. A numerical simulation for a present climate period of 30 years was performed using a regional chemistry transport model with a 25 km spatial resolution (horizontal), higher than those commonly applied. The results show an important seasonal behaviour, with a remarkable spatial pattern of difference between the north and the south of the domain. In winter, higher BaP ground levels are found during the NAO+ phase for the Mediterranean basin, while the spatial pattern of this feature (higher BaP levels during NAO+ phases) moves northwards in summer. These results show deviations up to and sometimes over 100% in the BaP mean concentrations, but statistically significant signals (p<0.1) of lower changes (20–40% variations in the signal) are found for the north of the domain in winter and for the south in summer.

持久性有机污染物（尤其是多环芳烃，尤其是多环芳烃）的大气浓度与气候变化和气候波动密切相关，这很可能会影响污染物的运输途径和转移过程。预测气候变化如何改变大气中多环芳烃的浓度仍然是一个特殊的挑战。从这个意义上讲，这一贡献的主要目的是评估北大西洋涛动指数（NAO）与欧洲范围内苯并[a] py的平均浓度（BaP，研究最多的PAH同类物）之间的关系，强调区域规模过程的影响。使用30 km空间分辨率（水平）的区域化学迁移模型，对当前30年的气候周期进行了数值模拟，该模型比常用的模型高。结果表明，该区域具有重要的季节性行为，该区域的北部和南部之间存在明显的空间差异。在冬季，地中海盆地在NAO +阶段发现了较高的BaP地面水平，而夏季该特征的空间格局（NAO +阶段则是较高的BaP水平）向北移动。这些结果表明，BaP平均浓度的偏差有时高达100％，但在冬季和冬季，该域的北部发现较低变化（信号变化20-40％）的统计学显着信号（p <0.1）。夏季的南方。高于通常应用的那些。结果表明，该区域具有重要的季节性行为，该区域的北部和南部之间存在明显的空间差异。在冬季，地中海盆地在NAO +阶段发现了较高的BaP地面水平，而夏季该特征的空间格局（NAO +阶段则是较高的BaP水平）向北移动。这些结果表明，BaP平均浓度的偏差有时高达100％，但在冬季和冬季，该域的北部发现较低变化（信号变化20-40％）的统计学显着信号（p <0.1）。夏季的南方。高于通常应用的那些。结果表明，该区域具有重要的季节性行为，该区域的北部和南部之间存在明显的空间差异。在冬季，地中海盆地在NAO +阶段发现了较高的BaP地面水平，而夏季该特征的空间格局（NAO +阶段则是较高的BaP水平）向北移动。这些结果表明，BaP平均浓度的偏差有时高达100％，但在冬季和冬季，该域的北部发现较低变化（信号变化20-40％）的统计学显着信号（p <0.1）。夏季的南方。地中海盆地在NAO +阶段发现了较高的BaP地面水平，而该特征的空间模式（NAO +阶段则是较高的BaP水平）在夏季向北移动。这些结果表明，BaP平均浓度的偏差有时高达100％，但在冬季和冬季，该域的北部发现较低变化（信号变化20-40％）的统计学显着信号（p <0.1）。夏季的南方。地中海盆地在NAO +阶段发现了较高的BaP地面水平，而该特征的空间模式（NAO +阶段则是较高的BaP水平）在夏季向北移动。这些结果表明，BaP平均浓度的偏差有时高达100％，但在冬季和冬季，该域的北部发现较低变化（信号变化20-40％）的统计学显着信号（p <0.1）。夏季的南方。