Fig. 2: Global LT in the SOLR for a set of selected channels and in atmospheric temperature at different altitudes.

a–f Left panels: layer effect on the IASI channel radiance for a tropical (red) and a subarctic (blue) standard atmosphere. The dashed lines show the altitude of the tropopause. Right panels: SOLR linear trends distributions on a 2° × 2° grid from 10 years (2008–2017) of IASI-derived clear-sky SOLR (percentage per year) for a the integrated [795–970 cm⁻¹; 1070–1230 cm⁻¹] window region, b a CO₂ window channel, c a CO₂ tropospheric channel, d a H₂O mid-tropospheric sensitive channel, e a H₂O upper-tropospheric sensitive channel, and f an O₃ stratospheric sensitive channel. Stippling indicates trends non-statistically significantly different from zero at the 95% confidence level. The colored areas indicate the identified climate phenomena. The colorscale range from −0.5 to 0.5, except for the two H₂O and the CO₂ window channel distributions where it ranges from −1 to 1. g–l Linear trends distributions of the surface and atmospheric temperatures at different levels of pressure based on 10 years (2008–2017) of ERA5 reanalysis dataset on a 1° × 1° grid³¹. Corresponding altitudes are indicated as well.