Assessment of overlap function retrievals using ALHAMBRA dual multispectral Raman lidar

The determination of overlap functions in lidar systems is essential for accurate aerosol profiling, particularly in the near-field range overlap between the telescope field of view and laser beam arise. Despite the various methods proposed, obtaining accurate results remains a challenge, especially under heterogeneous aerosol conditions. This study evaluates different experimental approaches, including Klett-Fernand and Raman inversion methodologies, along with a direct methodology that benefits from having near- and far-range telescope signals from the same lidar system. By analyzing data from the ALHAMBRA dual multiwavelength Raman lidar system, the effectiveness and limitations of these approaches are assessed. The results underscore the importance of accurately retrieving overlap functions for atmospheric vertical profiling and highlight the potential of new possible approaches to decrease uncertainties associated with lidar inversion algorithms and lidar ratio assumptions.