Axis 4: Project POLSAT (Satellites and Pollution)

The activity around the observation of the composition of the Earth's atmosphere by satellite based instruments has been strongly developed in our laboratory during recent years. Activities in this field intend to identify and optimize information that can be extracted from these observations in order to better understand the processes governing the atmospheric composition. Approaches developed here range from the interpretation of observations with model simulations to the development of methods allowing to combine model and observation to improve the simulated concentration fields and the representation of some processes in the models.

One of the strengths of this axis is the synergy of ground-level ozone observations from the IASI instrument and the CHIMERE model via data assimilation in order to improve mapping and prediction of the quality of air in Europe. The developed methods will also serve as bases to conduct experiments of systems of simulated observations (OSSEs) intended to define and quantify the contribution of future satellite instruments. Work aiming at understanding the controlling factors of the upper tropospheric distribution of organic oxygenated compounds are also conducted using the observations of the Canadian ACE-FTS instrument.

These activities are persued in the frame of the PolSat trans-thematic action that aims to develop synergies within two themes in the laboratory, Spectroscopy and Pollution.

Heat wave in Central Europe in 2007:
Detection of a pollution event from IASI observations (right) and comparison with the CHIMERE (left) air quality model.