Algorithms to retrieve particle optical properties using the space lidar ATLID onboard EarthCARE

We have developed algorithms to produce JAXA ATLID level 2 products using data measured by the lidar ATLID and imager MSI onboard the EarthCARE satellite. The algorithms estimate particle optical properties such as extinction, backscatter, and depolarization ratio as well as layer identifier, particle type identifier, and planetary boundary layer height. Furthermore, the algorithm estimates extinction coefficient of four aerosol components, dust, sea-salt, carbonaceous, and water-soluble particles using ATLID data; the other algorithm uses both ATLID and MSI data to estimate the extinction coefficient of the four aerosol components and column-mean mode-radii of fine-mode and coarse-mode aerosols. Prior to the ATLID algorithm development, we have developed a similar aerosol component retrieval algorithm using CALIOP and MODIS data; this technique was introduced into the ATLID algorithm. These algorithms were applied to the CALIOP long-term data, and the estimates have been used for evaluating aerosol radiation effects and data assimilation.