The Contribution of Black Carbon and Non-BC Absorbers to the Aerosol Absorption Coefficient in Nanjing, China
An aethalometer was employed in a 1-year campaign (November 2014-November 2015) in Nanjing, China, that aimed to estimate the contributions of black carbon (BC; annual average ± std = 4.0 ± 3.3 μg m^(-3)) and non-BC absorbers, such as brown carbon, to the aerosol absorption coefficient. We applied t...
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| creator | Leskinen, Ari Ruuskanen, Antti Kolmonen, Pekka Zhao, Yu Fang, Die Wang, Qingeng Gu, Cheng Jokiniemi, Jorma Hirvonen, Maija-Riitta Lehtinen, Kari E.J. Romakkaniemi, Sami Komppula, Mika |
| description | An aethalometer was employed in a 1-year campaign (November 2014-November 2015) in Nanjing, China, that aimed to estimate the contributions of black carbon (BC; annual average ± std = 4.0 ± 3.3 μg m^(-3)) and non-BC absorbers, such as brown carbon, to the aerosol absorption coefficient. We applied two methods: 1) the traditional calculation from the aethalometer data, assuming an absorption Ångström exponent (AAE) of unity for BC (＂AE method＂), which provided an overall average of 27.2% for the non-BC contribution, and 2) a recently developed method based on the wavelength dependence of AAE (the ＂WDA method＂), which indicated the existence of non-BC absorbers in 25.3% of the samples on average. We utilized trajectory and source area analyses and, in agreement with the results from other studies in this region, verified biomass burning emission sources, mainly to the northwest of the measurement site. |
| doi_str_mv | 10.4209/aaqr.2019.06.0326 |
| format | Article |
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We applied two methods: 1) the traditional calculation from the aethalometer data, assuming an absorption Ångström exponent (AAE) of unity for BC (＂AE method＂), which provided an overall average of 27.2% for the non-BC contribution, and 2) a recently developed method based on the wavelength dependence of AAE (the ＂WDA method＂), which indicated the existence of non-BC absorbers in 25.3% of the samples on average. We utilized trajectory and source area analyses and, in agreement with the results from other studies in this region, verified biomass burning emission sources, mainly to the northwest of the measurement site.</description><identifier>ISSN: 1680-8584</identifier><identifier>EISSN: 2071-1409</identifier><identifier>DOI: 10.4209/aaqr.2019.06.0326</identifier><language>eng</language><publisher>Cham: 社團法人台灣氣膠研究學會</publisher><subject>Absorbers ; Absorption ; Absorptivity ; Aerosols ; Air flow ; Algorithms ; Biomass ; Biomass burning ; Black carbon ; Burning ; Carbon ; Efficiency ; Emission analysis ; Humidity ; Light ; Methods ; Radiation ; Trajectory analysis</subject><ispartof>Aerosol and Air Quality Research, 2020-03, Vol.20 (3), p.590-605+ap1-17</ispartof><rights>Taiwan Association for Aerosol Research 2020</rights><rights>2020. This work is published under https://creativecommons.org/licenses/by-sa/4.0/ (the “License”). 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| subjects | Absorbers Absorption Absorptivity Aerosols Air flow Algorithms Biomass Biomass burning Black carbon Burning Carbon Efficiency Emission analysis Humidity Light Methods Radiation Trajectory analysis |
| title | The Contribution of Black Carbon and Non-BC Absorbers to the Aerosol Absorption Coefficient in Nanjing, China |
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