Tracking greenhouse gases: the HALO-CoMet missions 

The harmful greenhouse gases carbon dioxide (CO₂) and methane (CH₄) enter the atmosphere from both natural and man-made sources. The goal of the CoMet 2.0 Arctic mission with the HALO research aircraft in the summer of 2022 was to find out how much greenhouse gases the various sources actually emit. For this purpose, we equipped HALO with a system for the highly accurate and continuous in-situ measurement of carbon dioxide and methane. Our direct measurements of greenhouse gases in the atmosphere promise more accurate in-situ data than previous models.