A demonstration of adjoint methods for multi-dimensional remote sensing of the atmosphere and surface

摘要

Highlights?We demonstrate adjoint methods for atmospheric remote sensing in a two-dimensional setting.?Searchlight functions are used to handle the singularity of measurement response functions.?Adjoint methods require two radiative transfer calculations to evaluate the measurement misfit function and its derivatives with respect to all unknown parameters.?Synthetic retrieval studies show the scalability of adjoint methods to problems with thousands of measurements and unknown parameters.?Adjoint methods and the searchlight function technique are generalizable to 3D remote sensing.AbstractIn previous work, we derived the adjoint method as a computationally efficient path to three-dimensional (3D) retrievals of clouds and aerosols. In this paper we wi