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DOI	10.5194/acp-22-8439-2022
	Absorption enhancement of black carbon particles in a Mediterranean city and countryside: effect of particulate matter chemistry, ageing and trend analysis
	Yus-Diez, Jesus; Via, Marta; Alastuey, Andres; Karanasiou, Angeliki; Cruz Minguillon, Maria; Perez, Noemi; Querol, Xavier; Reche, Cristina; Ivancic, Matic; Rigler, Martin; Pandolfi, Marco
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	8439
结束页码	8456
卷号	22 期号:13 页码:18
英文摘要	Black carbon (BC) is recognized as the most important warming agent among atmospheric aerosol particles. The absorption efficiency of pure BC is rather well-known, nevertheless the mixing of BC with other aerosol particles can enhance the BC light absorption efficiency, thus directly affecting Earth's radiative balance. The effects on climate of the BC absorption enhancement due to the mixing with these aerosols are not yet well constrained because these effects depend on the availability of material for mixing with BC, thus creating regional variations. Here we present the mass absorption cross-section (MAC) and absorption enhancement of BC particles (E-abs), at different wavelengths (from 370 to 880 nm for online measurements and at 637 nm for offline measurements) measured at two sites in the western Mediterranean, namely Barcelona (BCN; urban background) and Montseny (MSY; regional background). The E-abs values ranged between 1.24 and 1.51 at the urban station, depending on the season and wavelength used as well as on the pure BC MAC used as a reference. The largest contribution to E-abs was due to the internal mixing of BC particles with other aerosol compounds, on average between a 91 % and a 100 % at 370 and 880 nm, respectively. Additionally, 14.5 % and 4.6 % of the total enhancement at the short ultraviolet (UV) wavelength (370 nm) was due to externally mixed brown carbon (BrC) particles during the cold and the warm period, respectively. On average, at the MSY station, a higher E-abs value was observed (1.83 at 637 nm) compared to BCN (1.37 at 637 nm), which was associated with the higher fraction of organic aerosols (OA) available for BC coating at the regional station, as denoted by the higher organic carbon to elemental carbon (OC : EC) ratio observed at MSY compared to BCN. At both BCN and MSY, E-abs showed an exponential increase with the amount of non-refractory (NR) material available for coating (R-NR(-PM)). The E-abs at 637 nm at the MSY regional station reached values up to 3 during episodes with high RNR-PM, whereas in BCN, E-abs kept values lower than 2 due to the lower relative amount of coating materials measured at BCN compared to MSY. The main sources of OA influencing E-abs throughout the year were hydrocarbon OA (HOA) and cooking-related OA (COA), i.e. primary OA (POA) from traffic and cooking emissions, respectively, at both 370 and 880 nm. At the short UV wavelength (370 nm), a strong contribution to E-abs from biomass burning OA (BBOA) and less oxidized oxygenated OA (LO-OOA) sources was observed in the colder period. Moreover, we found an increase of E-abs with the ageing state of the particles, especially during the colder period. This increase of E-abs with particle ageing was associated with a larger relative amount of secondary OA (SOA) compared to POA. The availability of a long dataset at both stations from offline measurements enabled a decade-long trend analysis of E-abs at 637 nm, that showed statistically significant (s.s.) positive trends of E-abs during the warmer months at the MSY station. This s.s. positive trend in MSY mirrored the observed increase of the OC : EC ratio over time. Moreover, in BCN during the COVID-19 lockdown period in spring 2020 we observed a sharp increase of E-abs due to the observed sharp increase of the OC : EC ratio. Our results show similar values of E-abs to those found in the literature for similar background stations.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000820199700001
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/273556
作者单位	Consejo Superior de Investigaciones Cientificas (CSIC); CSIC - Centro de Investigacion y Desarrollo Pascual Vila (CID-CSIC); CSIC - Instituto de Diagnostico Ambiental y Estudios del Agua (IDAEA); University of Barcelona
推荐引用方式 GB/T 7714	Yus-Diez, Jesus,Via, Marta,Alastuey, Andres,et al. Absorption enhancement of black carbon particles in a Mediterranean city and countryside: effect of particulate matter chemistry, ageing and trend analysis[J],2022,22(13):18.
APA	Yus-Diez, Jesus.,Via, Marta.,Alastuey, Andres.,Karanasiou, Angeliki.,Cruz Minguillon, Maria.,...&Pandolfi, Marco.(2022).Absorption enhancement of black carbon particles in a Mediterranean city and countryside: effect of particulate matter chemistry, ageing and trend analysis.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(13),18.
MLA	Yus-Diez, Jesus,et al."Absorption enhancement of black carbon particles in a Mediterranean city and countryside: effect of particulate matter chemistry, ageing and trend analysis".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.13(2022):18.