Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 9 23 2009 10.5194/acp-9-9315-2009 http://www.atmos-chem-phys.net/9/9315/2009/ http://www.atmos-chem-phys.net/9/9315/2009/acp-9-9315-2009.html http://www.atmos-chem-phys.net/9/9315/2009/acp-9-9315-2009.pdf 9315 9327 2009-12-11 Wildfire smoke in the Siberian Arctic in summer: source characterization and plume evolution from airborne measurements J.-D. Paris jean-daniel.paris@lsce.ipsl.fr A. Stohl P. Nédélec M. Yu. Arshinov M. V. Panchenko V. P. Shmargunov K. S. Law B. D. Belan P. Ciais Laboratoire des Sciences du Climat et de l'Environnement/IPSL, CNRS-CEA-UVSQ, Orme des Merisiers, CEA Saclay, Gif sur Yvette, France Norwegian Institute for Air Research, Kjeller, Norway Laboratoire d'Aérologie, CNRS-UPS, Toulouse, France Institute of Atmospheric Optics, SB-RAS, Tomsk, Russia UPMC Univ. Paris 06, Univ. Versailles St-Quentin, CNRS/INSU, LATMOS-IPSL, Paris, France We present airborne measurements of carbon dioxide (CO2), carbon monoxide (CO), ozone (O3), equivalent black carbon (EBC) and ultra fine particles over North-Eastern Siberia in July 2008 performed during the YAK-AEROSIB/POLARCAT experiment. During a "golden day" (11 July 2008) a number of biomass burning plumes were encountered with CO mixing ratio enhancements of up to 500 ppb relative to a background of 90 ppb. Number concentrations of aerosols in the size range 3.5–200 nm peaked at 4000 cm−3 and the EBC content reached 1.4 μg m−3. These high concentrations were caused by forest fires in the vicinity of the landing airport in Yakutsk where measurements in fresh smoke could be made during the descent. We estimate a combustion efficiency of 90 ± 3% based on CO and CO2 measurements and a CO emission factor of 65.5 ± 10.8 g CO per kilogram of dry matter burned. 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