Improving the seasonal cycle and interannual variations of biomass burning aerosol sources S. Generoso1, F.-M. Bréon1, Y. Balkanski1, O. Boucher2, and M. Schulz1 1Laboratoire des Sciences du Climat et de l’Environnement, CEA/CNRS, Gif-sur-Yvette, France 2Laboratoire d’Optique Atmosphérique, CNRS / Université des Sciences et Technologies de Lille, Villeneuve d’Ascq, France
Abstract. This paper suggests a method for improving current inventories of aerosol emissions from
biomass burning. The method is based on the hypothesis that, although the total estimates
within large regions are correct, the exact spatial and temporal description can be
improved. It makes use of open fire detection from the ATSR instrument that is available since 1996.
The emissions inventories are re-distributed in space and time according to the occurrence of open fires. Although the method is based on the night-time
hot-spot product of the ATSR, other satellite biomass burning proxies (AVHRR,
TRMM, GLOBSCAR and GBA2000) show similar distributions.
The impact of the method on the emission inventories is assessed using an aerosol transport
model, the results of which are compared to sunphotometer and satellite data.
The seasonal cycle of aerosol load in the atmosphere is significantly improved in several
regions, in particular South America and Australia. Besides, the use of ATSR fire detection
may be used to account for interannual events, as is demonstrated on the large Indonesian
fires of 1997, a consequence of the 1997-1998 El Niño. Despite these improvements, there
are still some large discrepancies between the simulated and observed aerosol optical thicknesses resulting from biomass burning emissions.
Citation: Generoso, S., Bréon, F.-M., Balkanski, Y., Boucher, O., and Schulz, M.: Improving the seasonal cycle and interannual variations of biomass burning aerosol sources, Atmos. Chem. Phys., 3, 1211-1222, doi:10.5194/acp-3-1211-2003, 2003.