The validation of a new TOMS ozone retrieval algorithm using ground -based measurement during DARGON campaing

A new version 9 TOMS algorithm has been proposed to provide more information about error bars and degree of freedom (DFS) of the retrieval, and simplify the retrieval process that results in clarifying the retrieval for user. The V9 algorithm has three retrieval processes. Residuals are calculated with a simple aerosol correction in Step-1. The Step-2 applies an optimal estimation method to get ozone profiles with conventional three TOMS wavelengths where sufficient ozone information is obtained. The outcome of this step will give information about error bars and DFS of retrieved ozone which allow users to accurately compare the ozone with other measurements. In Step-3, it makes corrections for clouds, which it actually doesn't consider in Step-1 and 2. The algorithm will do this process in a way that mathematically appropriate and so it can properly update the error and mathematical operators provided by Step-2. In this work, we want to show the validation study of the V9 TOMS total ozone by comparing with ground-based measurements from PANDORA, ozonesounding, and Brewer during the massive 2012 Dragon Campaign.