Global fire emission estimates for 2009-2010 derived from GOME-2 formaldehyde columns

Abstract : To derive updated global biomass burning emission estimates for non-methane volatile organic compounds (NMVOCs), formaldehyde columns retrieved from the Global Ozone Monitoring Experiment-2 (GOME-2) instrument (launched on MetOp-A in 2006) are used as top-down constraints in an inverse modeling scheme. Compared to GOME-1 the use of GOME-2 formaldehyde columns are found to be less sensitive to the South Atlantic Anomaly, offering new perspectives for the study of NMVOC emissions in the Amazon. Furthermore, the better Earth sampling of GOME-2 allows for a significant reduction of the noise on the monthly columns leading to a better identification of the emission sources. Furthermore, two corrections lead to a significant reduction of the scatter in the formaldehyde slant columns: a new retrieval scheme including a two-step fitting procedure that strongly reduces the interferences between formaldehyde and bromine oxide spectral structures, and a modified DOAS approach adopted to better handle the strong ozone absorption effects, improving the fit at large solar zenith angles. The new version of the Global Fire Emissions Database version 3 (GFEDv3) is used as bottom-up inventory in IMAGESv2 global chemistry-transport model for biomass burning. The principal updates of the GFEDv3 inventory with respect to the older GFEDv2 inventory are the use of improved satellite input data, the explicit inclusion of deforestation and forest degradation fires in the model, the partitioning of fire emissions into different source categories, and an uncertainty analysis. The agreement between formaldehyde columns calculated by the IMAGESv2 model and the formaldehyde columns from GOME-2 is optimized using the adjoint modelling technique. This technique allows for the optimization of the emission strengths at the model resolution and provides a differentiation among the emission sources. Updated biomass burning emissions estimates are obtained monthly for 2009 and 2010 at the model resolution (2 x 2.5°). They will be evaluated through comparison with the Fire INventory from NCAR 55 (FINN) for the target years. Further, CO columns retrieved from the Infrared Atmospheric Sounding Interferometer (IASI) abroad on MetOp-A will be compared with CO simulated columns over the fire affected regions using the a priori and the optimized biomass burning emission inventory.
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Submitted on : Monday, September 17, 2012 - 2:22:11 PM
Last modification on : Sunday, July 21, 2019 - 6:40:50 AM

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  • HAL Id : hal-00732943, version 1

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M. Bauwens, T. Stavrakou, J.-F. Müller, I. de Smedt, M. van Roozendael, et al.. Global fire emission estimates for 2009-2010 derived from GOME-2 formaldehyde columns. ESA Conference on Advances in Atmospheric Science and Applications (ATMOS 2012), Jun 2012, Bruges, Belgium. ⟨hal-00732943⟩

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