|
Atmos. Chem. Phys. Discuss., 10, 7347-7382, 2010
www.atmos-chem-phys-discuss.net/10/7347/2010/ doi:10.5194/acpd-10-7347-2010 © Author(s) 2010. This work is distributed under the Creative Commons Attribution 3.0 License. |
Western african aerosols modelling with updated biomass burning emission inventories in the frame of the AMMA-IDAF program
1Laboratoire d'Aérologie, Université de Toulouse, CNRS, UMR 5560, 14 avenue Edouard Belin, 31400 Toulouse, France
2Joint Research Centre (JRC) of the European Commission Institute for Environment and Sustainability (IES), Global Environment Monitoring Unit (GEM), TP 440, Via Fermi, 2749, 21027 Ispra (VA), Italy
3Faculté des Sciences et Techniques, Université d'Abomey-Calavi, BP 07-0094, Cotonou, Benin, France
4Université de Cocody Abidjan, UFR SSMT 22 bp 582 Abidjan 22, Ivory Coast, France
5Faculté des Sciences - Département de Physique, B.P. 10662 Niamey, Niger
6UPMC Univ. Paris 6, CNRS-INSU, LATMOS-IPSL, 75005 Paris, France
7NOAA Earth System Research Laboratory, 80305-3337 Boulder, USA
8Cooperative Institute for Research in Environmental Sciences, University of Colorado, 80309-0216 Boulder, USA
9LGIT, Maison des Géosciences, 38400 Saint Martin d'Heres, France
10KNMI (Royal Netherlands Meteorological Institute), Chemistry and Climate Division, P.O. Box 201, 3730 AE De Bilt, The Netherlands
Abstract. African biomass burning emission inventories for gases and particles (AMMABB) have been constructed at a resolution of 1 km by 1 km with daily coverage for the 2000–2007 period. They have been evaluated using the ORISAM-TM4 global chemistry transport model, which includes a detailed aerosol module. This paper discussed comparisons between modelled results and new AMMA measurements for surface BC and OC concentrations and scattering coefficients, aerosol optical depths and single scattering albedo from sunphotometer and satellite data. Major aerosol seasonal and interannual evolution over the period 2004–2007 observed at Djougou (Benin) and Banizoumbou (Niger) AMMA/IDAF sites are well reproduced by our global model, showing the importance of using accurate biomass burning emissions. It is the first time to our knowledge that a global model treating core/shell mixing for optical calculations reproduces aerosol optical depths (AOD) values of the same order as satellite and AERONET data. Comparison of simulated and measured concentrations for different class sizes simulated by the model give information on possible refinements of the emissions, according to the particulate size fraction, which have an impact on aerosol optical properties.
Citation: Liousse, C., Guillaume, B., Grégoire, J. M., Mallet, M., Galy, C., Pont, V., Akpo, A., Bedou, M., Castéra, P., Dungall, L., Gardrat, E., Granier, C., Konaré, A., Malavelle, F., Mariscal, A., Mieville, A., Rosset, R., Serça, D., Solmon, F., Tummon, F., Assamoi, E., Yoboué, V., and Van Velthoven, P.: Western african aerosols modelling with updated biomass burning emission inventories in the frame of the AMMA-IDAF program, Atmos. Chem. Phys. Discuss., 10, 7347-7382, doi:10.5194/acpd-10-7347-2010, 2010.