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Article Dans Une Revue Journal of Aerosol Science Année : 2009

Ambient measurements of light-absorption by agricultural waste burning organic aerosols

S. C. Alfaro
  • Fonction : Auteur
J. Sciare
  • Fonction : Auteur
H. Cachier
  • Fonction : Auteur
M. M. Abdelwahab
  • Fonction : Auteur

Résumé

Absorption properties (absorption Angstrom exponent and mass absorption efficiency) of agricultural waste burning organic aerosols (AWB-OA) and their impact on total absorption were investigated in Cairo (Egypt) during the post-harvest rice straw burning autumn season. At 370 nm, AWB-OA were found to account for more than 25% of total absorption on average for the period of study (and for similar to 50% during intense biomass burning events), pointing out the major role potentially played by such particles on light absorption at short wavelengths. The absorption exponent obtained for AWB-OA (similar to 3.5) is consistent with values previously reported for biomass burning brown carbon. In addition, AWB-OA were found to exhibit high mass absorption efficiencies at the near ultraviolet/mid-visible regions (e.g. 3.2 +/- 1.6 m(2) g(-1) at 370 nm and 0.8 +/- 0.4 m(2) g(-1) at 520 nm). Such findings clearly illustrate the need to take light absorption by organic aerosols into account for a better estimate of the radiative impact of biomass burning aerosols. (C) 2009 Elsevier Ltd. All rights reserved.

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hal-00431146 , version 1 (10-11-2009)

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O. Favez, S. C. Alfaro, J. Sciare, H. Cachier, M. M. Abdelwahab. Ambient measurements of light-absorption by agricultural waste burning organic aerosols. Journal of Aerosol Science, 2009, 40 (7), pp.613-620. ⟨10.1016/j.jaerosci.2009.04.002⟩. ⟨hal-00431146⟩
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