[hal-00735679] CO Seasonal Variability and Trend Over Paris Megacity Using Ground-Based QualAir FTS and Satellite IASI-MetOp Measurements

In a growing world with more than 7 billion inhabitants and big emerging countries such as China, Brazil and India, emissions of anthropogenic pollutants are increasing continuously. Monitoring and control of atmospheric pollutants in megacities have become a major challenge for scientists and public health authorities in environmental research area. The QualAir platform at University Pierre et Marie Curie (UPMC), is an innovating experimental research platform dedicated to survey urban atmospheric pollution and air quality. As one of the major instruments of the QualAir platform, the ground-based Fourier transform spectrometer (QualAir FTS, IFS 125HR model) analyses the composition of the urban atmosphere of Paris, which is the third European megacity. The continuous monitoring of atmospheric pollutants is essential to improve the understanding of urban air pollution processes. Associated with a sun-tracker, the QualAir remote sensing FTS operates in solar infrared absorption and enables to monitor many trace gases, and to follow up their variability in the Ile-de-France region. A description of the QualAir FTS will be given. Concentrations of atmospheric pollutants are retrieved by the radiative transfer model PROFFIT. Located in the centre of Paris, the QualAir FTS can provide new and complementary urban measurements as compared to unpolluted ground-based stations of existing networks (NDACC and TCCON). Ground-based remote sensing measurements from QualAir FTS will be compared to ground in-situ and satellite data like IASI-MetOp (Infrared Atmospheric Sounding Interferometer, a high resolution, nadir viewing Fourier Transform Spectrometer working in the thermal infrared range extending from 645 to 2760 cm-1 (with no gaps) and flying on a polar orbit on the METOP-A platform since 5 years). Seasonal variability and trend of carbon monoxide over Paris will be presented.



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