CarbonCGI road map to observe faint GHG source’s emissions with high resolution observing system

Abstract

The paper presents the results of the 2021 CarbonCGI project, specified by ESA Future Earth Observation department, dedicated to high-resolution observations of GHG (Greenhouse Gas) with CGI (Compact Gas Imager). CarbonCGI aims at detecting and characterizing faint anthropogenic emissions of Carbon dioxide and Methane gas, from low orbit satellite to complement and extend CO2M mission [1] . CGI are developed in an integrated team of scientists and engineers involved in the framework of CarbonCGI project, the IRT (Research and Technological Institute) NS3 (New Space Small Sensor) project and the scientific activities of the industrial chair TRACE [2] . Compact Gas Imagers developments cover the atmospheric transport inverse modelling (level 4), the radiative transfer modelling (level 2), the simulation of acquisition chain, data correction, registration and calibration, as well as detailed design of sensor and critical components (level 0-1).

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“…The Compact Gas Imager (CGI) is an optical instrument dedicated to the detection, quantification, and identification of gas sources in the atmosphere 1 . Combining the advantages of an imager and a sounder, CGI delivers a high spatial resolution image of gases with high precision and accuracy measurements of gas concentration.…”

“…The Normalized Modulation Amplitude (NMA) of PSI (i.e. modulation amplitude divided by baseline) obtained for each pixel provides a good approximation (NMA hypothesis), for stray light analysis, of the gas concentration information 1 .…”