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Communication Dans Un Congrès Année : 2010

Ten years of CO emissions as seen from MOPITT

Résumé

Satellites data can be combined in sophisticated inversion systems that take the impact of the chemistry of the lower atmosphere into account. In order to improve our knowledge of the emissions of greenhouse gases and of their precursors at the global scale, we have developed a multi-species inversion system of the emission fluxes and 3D-production of the gases involved in the oxidation chain of methane (CH4 ), in particular carbon monoxide (CO) and formaldehyde (HCHO), reacting with hydroxyl radicals (OH). The inverse modelling approach offers an attractive solution to the problem of estimating the gaseous emissions, that allows to correct the prior inventories. For the first time, this study aims at estimating the CO emissions for the past ten years (from March 2000 to December 2009), using our multi-species inversion system and the MOPITT Version 4 retrievals. Our validation strategy consists in comparing our posterior-modelled concentrations with several sets of independent measurements: surface measurements, aircraft and satellite. The posterior emissions, with a global 10-year average of 1368 TgCO/yr, are 37% higher than the prior ones, built from the EDGAR 3.2 and the GFEDv2 inventories (1005 TgCO/yr on average). In addition, they present some significant and challenging seasonal variations in the northern hemisphere that are not present in our prior nor in others major inventories (IPCC AR5, RETRO, EPA, EMEP). Our results exhibit some large interannual variability due to biomass burning emissions, climate, and socioeconomic factors. Indeed, the highest annual budget of the last decade is seen for year 2007 with 1457 TgCO/yr, because of fires over South East Asia and South American Temperate. Then, the CO emissions show a dramatic decrease (1277 TgCO/yr in 2009), that could be connected to the economic recession.
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Dates et versions

hal-04115200 , version 1 (02-06-2023)

Identifiants

Citer

C. Audrey, F. Chevallier, I. Pison, Philippe Bousquet, S. Szopa, et al.. Ten years of CO emissions as seen from MOPITT. American Geophysical Union 2010, Dec 2010, San Francisco California, United States. pp.abstract id. A51H-01. ⟨hal-04115200⟩
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