The hyperspectral unmixing of nitrogen dioxide from the ESA-SCIAMACHY Nadir measurements

The Nadir reflectances, measured by the SCIAMACHY hyperspectral sensor, are used to retrieve vertical column concentrations of nitrogen dioxide (NO₂), resulting from anthropogenic pollution. The estimation process is realized via a blind source separation method: the unmixing of the NO₂ spectral waveform from the overall atmospheric absorption contribution within the logarithmic reflectance spectra is realized.