Changes in Air Quality in Different World Regions for the Past Decades: analyses using chemistry-climate simulations and observations from satellite and monitoring stations

Abstract : Surface emissions of atmospheric compounds have changed dramatically in many world regions during the past decades. In this study, we investigate the spatial variability of long-term changes of atmospheric compounds such as carbon monoxide (CO) and nitrogen dioxide (NO2) over the 1980-2010 period, as simulated by the Community Atmospheric Model (CAM4-Chem). Simulated trends are compared with temporal changes derived from different satellite and ground-based observations, with a focus on Europe, North America and Eastern China regions. Results of simulations using the Hadley Centre Coupled Model-United Kingdom Chemistry and Aerosols model (HadGEM3-UKCA) are included in the analyses. Similar negative trends in the CO and NO2 tropospheric columns are generally observed in both CAM4-Chem and HadGEM3-UKCA simulations and measurements, especially in Europe and the USA. Significant model-observation differences in CO and NO2 trends are shown in other regions. During the 2000-2010 period, CAM4-Chem simulated an increase in CO column trends while MOPITT reported a decrease in Eastern China, in contrast with the significant increase in anthropogenic CO emissions during this period. Such differences could be linked to several factors such as uncertainties in the chemical dynamical schemes included in the model, as well as inaccuracies in the satellite retrievals, or in the surface emissions, which mainly drive the CO trends. Temporal changes in tropospheric NO2 columns from model simulations were consistent with satellite observations as well as surface measurements from the US-EPA and EMEP networks in Europe and the USA. However, the magnitudes of modeled trends were generally lower than those from satellite and surface observations.
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https://hal-insu.archives-ouvertes.fr/insu-01380702
Contributor : Catherine Cardon <>
Submitted on : Thursday, October 13, 2016 - 1:30:20 PM
Last modification on : Friday, July 26, 2019 - 1:44:05 PM

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  • HAL Id : insu-01380702, version 1

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El Hadji Thierno Doumbia, Claire Granier, Katerina Sindelarova, Simone Tilmes, Idir Bouarar, et al.. Changes in Air Quality in Different World Regions for the Past Decades: analyses using chemistry-climate simulations and observations from satellite and monitoring stations. IGAC 2016 Science Conference (International Global Atmospheric Chemistry), Sep 2016, Breckenridge, United States. ⟨insu-01380702⟩

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