CO monitoring with IASI: global and local variability

International audienceCarbon monoxide (CO) is an important trace gas for understanding air quality and atmosphericcomposition. It is a good tracer of pollution plumes and atmospheric dynamics. Since the launch ofthe MetOp satellite, IASI CO concentrations are retrieved on a daily base and in near real time fromthe radiance data, using the Fast Operational/Optimal Retrievals on Layers for IASI (FORLI)algorithm. These products are now generated and operationally distributed by EUMETCAST underthe O3MSAF auspices.Global scale CO distributions will be shown, and the seasonal/annual variabilities over 8 years willbe analyzed. A special focus will be put on the record concentrations observed over the islands ofBorneo and Sumatra in the fall 2015, due to the worst forest fires in nearly two decades. Thispollution excess is associated with the predictable impacts of the strong El Niño currently underway.We will provide estimates of the carbon emissions using a data-assimilation system that derives COemissions from IASI data. Finally, we will show how this event is taken into account by theCopernicus Atmospheric Monitoring Service, and the usefulness of the IASI data in this context