Influence of the North Atlantic oscillation on the atmospheric levels of benzo[a]pyrene over Europe

被引:7
|
作者
Jimenez-Guerrero, Pedro [1 ,2 ]
Ratola, Nuno [3 ]
机构
[1] Univ Murcia, Phys Earth, Dept Phys, Reg Campus Int Excellence CEIR, Campus Mare Nostrum, Murcia 30100, Spain
[2] Biomed Res Inst Murcia IMIB Arrixaca, Murcia 30120, Spain
[3] Univ Porto, Fac Engn, LEPABE Lab Proc Engn Environm Biotechnol & Energy, Rua Dr Roberto Frias, P-4200465 Porto, Portugal
关键词
North Atlantic oscillation; Benzo[a]pyrene; Chemistry; climate modelling; Chemical transport; POLYCYCLIC AROMATIC-HYDROCARBONS; LONG-RANGE TRANSPORT; PAH CONCENTRATIONS; CLIMATE FLUCTUATIONS; POPULATION EXPOSURE; DECADAL TRENDS; DRY DEPOSITION; AMBIENT AIR; POLLUTION; IMPACTS;
D O I
10.1007/s00382-021-05766-0
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
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.
引用
收藏
页码:1173 / 1186
页数:14
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