Fig 3.4.2.3.2.3.1: Slant column measurements of NO₂ from nadir mode measurements during an orbit passing over Europe and limb mode measurements made during the same orbit.

Image: AT2-ELS

The limb mode measurements initially produce a profile of stratospheric NO₂. This profile is converted to a stratospheric Vertical Column Density, VCD_strat, by integrating the profile from the tropopause up to the top of the atmosphere. This stratospheric Vertical Column Density is then converted to a stratospheric Slant Column Density, SCD_strat.

Fig 3.4.2.3.2.3.2: Schematic of the SCD_total measurements for both orbits.

Image: AT2-ELS