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DOI10.5194/acp-19-11363-2019
Over a 10-year record of aerosol optical properties at SMEAR II
Luoma, Krista1; Virkkula, Aki1,2; Aalto, Pasi1; Petaja, Tuukka1; Kulmala, Markku1
2019-09-09
发表期刊ATMOSPHERIC CHEMISTRY AND PHYSICS
ISSN1680-7316
EISSN1680-7324
出版年2019
卷号19期号:17页码:11363-11382
文章类型Article
语种英语
国家Finland
英文摘要

Aerosol optical properties (AOPs) describe the ability of aerosols to scatter and absorb radiation at different wavelengths. Since aerosol particles interact with the sun's radiation, they impact the climate. Our study focuses on the long-term trends and seasonal variations of different AOPs measured at a rural boreal forest site in northern Europe. To explain the observed variations in the AOPs, we also analyzed changes in the aerosol size distribution. AOPs of particles smaller than 10 mu m (PM10) and 1 mu m (PM1) have been measured at SMEAR II, in southern Finland, since 2006 and 2010, respectively. For PM10 particles, the median values of the scattering and absorption coefficients, single-scattering albedo, and backscatter fraction at lambda = 550 nm were 9.8 Mm(-1), 1.3 Mm(-1), 0.88, and 0.14. The median values of scattering and absorption angstrom ngstrom exponents at the wavelength ranges 450-700 and 370-950 nm were 1.88 and 0.99, respectively. We found statistically significant trends for the PM10 scattering and absorption coefficients, single-scattering albedo, and backscatter fraction, and the slopes of these trends were -0.32 Mm(-1), -0.086 Mm(-1), 2.2 x 10(-3), and 1.3 x 10(-3) per year. The tendency for the extensive AOPs to decrease correlated well with the decrease in aerosol number and volume concentrations. The tendency for the backscattering fraction and single-scattering albedo to increase indicates that the aerosol size distribution consists of fewer larger particles and that aerosols absorb less light than at the beginning of the measurements. The trends of the single-scattering albedo and backscattering fraction influenced the aerosol radiative forcing efficiency, indicating that the aerosol particles are scattering the radiation more effectively back into space.


领域地球科学
收录类别SCI-E
WOS记录号WOS:000485666500001
WOS关键词LIGHT-ABSORPTION MEASUREMENTS ; RADIATIVE PROPERTIES ; BLACK CARBON ; SEASONAL CYCLE ; DECADAL TRENDS ; VARIABILITY ; AETHALOMETER ; CLIMATE ; ALBEDO ; PARTICLES
WOS类目Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS研究方向Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
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文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/186964
专题地球科学
作者单位1.Univ Helsinki, Inst Atmospher & Earth Syst Res, FIN-00014 Helsinki, Finland;
2.Finnish Meteorol Inst, Atmospher Composit Res, Helsinki 00560, Finland
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Luoma, Krista,Virkkula, Aki,Aalto, Pasi,et al. Over a 10-year record of aerosol optical properties at SMEAR II[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2019,19(17):11363-11382.
APA Luoma, Krista,Virkkula, Aki,Aalto, Pasi,Petaja, Tuukka,&Kulmala, Markku.(2019).Over a 10-year record of aerosol optical properties at SMEAR II.ATMOSPHERIC CHEMISTRY AND PHYSICS,19(17),11363-11382.
MLA Luoma, Krista,et al."Over a 10-year record of aerosol optical properties at SMEAR II".ATMOSPHERIC CHEMISTRY AND PHYSICS 19.17(2019):11363-11382.
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