The version 5 aerosol algorithm requires an assumed particles size distribution which introduces errors into the retrieved extinction. Version 6 couples the retrieval of extinction and a particle size parameter for more accurate retrievals. The main differences between versions 5 and 6 include:
- Incorporation of the 1.53 µm infrared imager channel for a second measurement vector.
- A lognormal size distribution with a mode width is still assumed, however both mode radius and number density are retrieved.
- Parameter space is searched using the Levenberg-Marquardt algorithm.