Optical properties of elemental carbon and water-soluble organic carbon in Beijing, China
作者： Y Cheng , K-B He , M Zheng , F-K Duan , Y-L Ma
DOI: 10.5194/ACPD-11-6221-2011
关键词: Absorption (electromagnetic radiation) 、 Wavelength 、 Environmental chemistry 、 Total organic carbon 、 Beijing 、 Chemistry 、 Carbon 、 Elemental carbon 、 Spectral line 、 Aerosol
摘要: Abstract. The mass absorption cross-section (MAC) of elemental carbon (EC) in Beijing was quantified using a thermal-optical analyzer and the influences mixing state sources carbonaceous aerosol were investigated. MAC measured at 632 nm 29.0 32.0 m2 g−1 during winter summer respectively. correlated well with organic (OC) to EC ratio (R2 = 0.91) which includes important information about extent secondary (SOA) production, indicating enhancement by coating SOA. extrapolated value 10.5 when OC is zero, 5.6 after correction factor (1.87) caused artifacts associated "filter-based" methods. also increased sulphate 0.84) concentration below 10 μg m−3, whereas only weekly related above enhanced sulphate. Based on converting approach that accounts for discrepancy measurements methods both light concentration, previously published values converted "equivalent MAC", estimated if same measurement as used this study. MAC" found be much lower regions heavily impacted biomass burning (e.g., India), probably due influence brown carbon. Optical properties water-soluble (WSOC) presented. Light WSOC exhibited strong wavelength (λ) dependence such varied approximately λ−7, characteristic spectra. efficiency (σabs) (measured 365 nm) 1.83 0.70 seasonal pattern σabs attributed difference precursors SOA, because has been demonstrated strongly linked Moreover, higher than results from southeastern United States obtained method study, perhaps burning.
atmos-chem-phys-discuss.net
harvard.edu参考文章(73)
A Gelencser, A Hoffer, G Kiss, E Tombacz, R Kurdi, L Bencze, In-situ formation of light-absorbing organic matter in cloud water Journal of Atmospheric Chemistry. ,vol. 45, pp. 25- 33 ,(2003) , 10.1023/A:1024060428172
R. W. Bergstrom, T. P. Ackerman, L. W. Richards, The Optical Properties of Particulate Elemental Carbon Springer, Boston, MA. pp. 43- 51 ,(1982) , 10.1007/978-1-4684-4154-3_3
Mark Z. Jacobson, Strong radiative heating due to the mixing state of black carbon in atmospheric aerosols Nature. ,vol. 409, pp. 695- 697 ,(2001) , 10.1038/35055518
Fengkui Duan, Xiande Liu, Tong Yu, Hélène Cachier, Identification and estimate of biomass burning contribution to the urban aerosol organic carbon concentrations in Beijing Atmospheric Environment. ,vol. 38, pp. 1275- 1282 ,(2004) , 10.1016/J.ATMOSENV.2003.11.037
D. T. L. Alexander, P. A. Crozier, J. R. Anderson, Brown carbon spheres in East Asian outflow and their optical properties Science. ,vol. 321, pp. 833- 836 ,(2008) , 10.1126/SCIENCE.1155296
Meinrat O Andreae, Paul J Crutzen, None, Atmospheric aerosols: Biogeochemical sources and role in atmospheric chemistry Science. ,vol. 276, pp. 1052- 1058 ,(1997) , 10.1126/SCIENCE.276.5315.1052
Patricia Krecl, Johan Ström, Christer Johansson, Carbon content of atmospheric aerosols in a residential area during the wood combustion season in Sweden Atmospheric Environment. ,vol. 41, pp. 6974- 6985 ,(2007) , 10.1016/J.ATMOSENV.2007.06.025
A Knox, GJ Evans, JR Brook, X Yao, C-H Jeong, KJ Godri, K Sabaliauskas, JG Slowik, None, Mass Absorption Cross-Section of Ambient Black Carbon Aerosol in Relation to Chemical Age Aerosol Science and Technology. ,vol. 43, pp. 522- 532 ,(2009) , 10.1080/02786820902777207
Tami C. Bond, Spectral dependence of visible light absorption by carbonaceous particles emitted from coal combustion Geophysical Research Letters. ,vol. 28, pp. 4075- 4078 ,(2001) , 10.1029/2001GL013652
C. Liousse, H. Cachier, S.G. Jennings, Optical and thermal measurements of black carbon aerosol content in different environments: Variation of the specific attenuation cross-section, sigma (σ) Atmospheric Environment. Part A. General Topics. ,vol. 27, pp. 1203- 1211 ,(1993) , 10.1016/0960-1686(93)90246-U