Global Ozone Monitoring Experiment-2 (GOME-2) Level 1B Data

The algorithm uses a pair of wavelengths 331nm and 318nm (340nm and 331nm for high solar zenith angle) to derive total ozone and surface reflectivity. It first calculates N-value at the pair of wavelengths using input radiance/irradiance from GOME-2 level 1b data.

With its geo-reference information, such as latitude, longitude, solar zenith angle, etc., the measured N-value is compared with pre-calculated N-value to derive the step-one total ozone and reflectivity. The pre-calculated N-value is generated by using a forward radiative transfer model. In order to obtain step-two ozone, the profiles of ozone and temperature climatologies are then applied at all levels to account for seasonal and latitudinal variations in profile shape.