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DOI	10.5194/acp-19-14849-2019
	On the seasonal variation in observed size distributions in northern Europe and their changes with decreasing anthropogenic emissions in Europe: Climatology and trend analysis based on 17 years of data from Aspvreten; Sweden
	Tunved P.; Ström J.
发表日期	2019
ISSN	16807316
起始页码	14849
结束页码	14873
卷号	19 期号:23
英文摘要	Size-resolved aerosol trends were investigated based on a 17-year data set (2000-2017) from the rural background site Aspvreten located in southern Sweden (58.8° N, 17.4° E). Cluster analysis of the size distributions was performed to aid in the interpretation of the data. The results confirm previous findings of decreasing aerosol mass and number during the last decades as a result of reduced anthropogenic emissions in Europe. We show that both particle modal number concentration and size have substantially been reduced during the last 17 years. Negative trends in particle number concentration of about 10 cm-3 yr-1 are present for nuclei, Aitken, and accumulation modes. In total, integral particle number concentration has decreased by 30 %, from 1860 to ca. 1300 cm-3. The reduction in modal number concentration is accompanied by a decrease in modal size, and this decrease is largest for the accumulation mode (2 nm yr-1 or about 17% for the whole period). These reductions have resulted in a decrease in submicron particle mass (< 390 nm) by more than 50% over the period 2000-2017. These decreases are similar to observations found at other stations in northern Europe. Although all size classes show a downward trend as annual averages, we also show that observed trends are not evenly distributed over the year and that a rather complex picture emerges where both sign and magnitude of trends vary with season and size. The strongest negative trends are present during spring (accumulation mode) and autumn (Aitken mode). The strongest positive trends are present during summer months (Aitken mode). The combined trajectory and data analyses do not present evidence for an increase in new particle formation formed locally, although some evidence of increased new particle formation some distance away from the receptor is present. Observed aerosol size distribution data, together with an adiabatic cloud parcel model, were further used to estimate the change in cloud droplet concentration for various assumptions of updraught velocities and aerosol chemical composition. The results indicate a substantial increase in the atmospheric brightening effect due to a reduction in cloud reflectivity corresponding to 10 %-12% reduction in cloud albedo over the period 2000-2017. © 2019 BMJ Publishing Group. All rights reserved.
语种	英语
scopus关键词	aerosol; anthropogenic source; climatology; emission inventory; formation mechanism; particle size; seasonal variation; size distribution; trend analysis; Aspvreten; Northern Europe; Sodermanland; Sweden
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/143989
作者单位	Department of Environmental Science and Analytical Chemistry, Stockholm University, Stockholm, 10691, Sweden
推荐引用方式 GB/T 7714	Tunved P.,Ström J.. On the seasonal variation in observed size distributions in northern Europe and their changes with decreasing anthropogenic emissions in Europe: Climatology and trend analysis based on 17 years of data from Aspvreten; Sweden[J],2019,19(23).
APA	Tunved P.,&Ström J..(2019).On the seasonal variation in observed size distributions in northern Europe and their changes with decreasing anthropogenic emissions in Europe: Climatology and trend analysis based on 17 years of data from Aspvreten; Sweden.Atmospheric Chemistry and Physics,19(23).
MLA	Tunved P.,et al."On the seasonal variation in observed size distributions in northern Europe and their changes with decreasing anthropogenic emissions in Europe: Climatology and trend analysis based on 17 years of data from Aspvreten; Sweden".Atmospheric Chemistry and Physics 19.23(2019).