Toward High‐Resolution Global Atmospheric Inverse Modeling Using Graphics Accelerators

The ability of global transport models to go up in resolution becomes discriminating for greenhouse gas atmospheric inversions. This paper describes the porting on Graphics Processing Units model currently used European operational Copernicus Atmosphere Monitoring Service (CAMS) CO2 and N2O It represents an important milestone achieve sub-degree resolution. code includes not only direct but also its tangent-linear adjoint versions which are needed variational Tests were carried out at a 2.50° longitude, 1.27° latitude 79 layers vertical, corresponding 1,626,768 3D cells, 4.5 times more than current standard CAMS reanalyzes. A month's worth computation now takes 2.5 min, including 50 s reading meteorological data.