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NMVOC emissions over China estimated from HCHO and CHOCHO GOME-2 data

Jean-Francois Muller(1), Jenny Stavrakou(1), Isabelle De Smedt(1), Christophe Lerot(1) and Michel Van Roozendael(1)

(1) Belgian Institute for Space Aeronomy, Avenue Circulaire 3, 1180, Belgium


Glyoxal (CHOCHO) and formaldehyde (HCHO) are short-lived intermediate products formed in the oxidation of non-methane volatile organic compounds (NMVOCs) emitted by vegetation, fires and anthropogenic activities. They are also directly emitted during fossil fuel and biofuel combustion and biomass burning events. State-of-knowledge estimations, although still quite uncertain, agree that oxidation of isoprene constitutes a major contribution to the globally calculated budget for both compounds, whereas primary and secondary production from anthropogenic NMVOCs is also significant, contributing up to 27%, and to 7% to the global glyoxal and formaldehyde budget, respectively, but is estimated to be much more important in the highly industrialized areas of the Northern Hemisphere. In a recent study, we have explored the capability of the combined use of glyoxal and formaldehyde satellite columns retrieved from the SCIAMACHY/ENVISAT instrument and the IMAGESv2 global chemistry-transport model, in order to improve the biogenic and pyrogenic NMVOC current emission estimates (Stavrakou et al., ACPD, submitted). Motivated by the rapid Chinese growth, we focus this study on anthropogenic NMVOC emissions and investigate the potential to provide constraints for these emissions by making use of a new dataset of glyoxal and formaldehyde columns retrieved by the GOME-2/Metop satellite instrument for 2007-2008, and the IMAGESv2 global CTM. The model chemical degradation scheme includes 20 glyoxal and formaldehyde NMVOC precursors. We test different inventories for anthropogenic NMVOC emissions.


Workshop presentation