Extended Data Fig. 1: Continuum optical depth versus latitude and solar longitude.
From: Martian dust storm impact on atmospheric H2O and D/H observed by ExoMars Trace Gas Orbiter
The colour denotes the lowest altitude at which the optical depth is less than 1.0, that is, the lowest altitude where sunlight can still penetrate the atmosphere easily. There is a strong latitudinal dependence, with northern and southern high latitudes being relatively clear until the line of sight drops below 10–15 km (blue and dark blue)—except during the Ls = 200°–240° period, where the GDS appears to have raised this altitude to 20–25 km (light blue and cyan).
