Data analysis and acquisition using spectrometer EM27/SUN to validate satellite missions for greenhouse gas monitoring.

The accurate monitoring of greenhouse gas (GHG) emissions, particularly carbon dioxide (CO2), is essential in the global effort to address climate change. My internship focused on the development of tools and methodologies to enhance ground-based observations, particularly using the EM27/SUN Fourier Transform Spectrometer, within the framework of CNES’s satellite validation missions. The primary objective was the creation of the "PROFFAST dashboard", a tool designed for real-time data treatment and visualization during GHG measurement campaigns. This dashboard enables immediate analysis and dynamic adjustment of field operations, improving data collection efficiency. Additionally, the thesis involved participating in a summer observation campaign, which aimed to validate the performance of multiple EM27/SUN spectrometers and to check the validity of models of CO2 distribution. The results demonstrated consistency with expected CO2 trends and provided insights into the vertical distribution of CO2, influenced by factors such as vegetation. Furthermore, models of vertical distribution of CO2 have been proved to be less accurate in the lower layer of the atmosphere and in mountainous areas. These contributions are crucial for advancing the precision of GHG monitoring and for supporting the validation of satellite-based observation systems, ultimately aiding in the global effort to mitigate climate change.