Title: Remote sensing of atmosphere-ocean systems in the UV part of the spectrum by the 2022 NASA/PACE mission: distinguishing brown carbon aerosols from dissolved organic matter in the ocean Presenter: Jacek Chowdhary Abstract: The NASA Plankton, Aerosol, Cloud Ecosystems (PACE) mission, scheduled for launch in 2022, will carry various instruments, including one polarimeter, that will make hyperspectral measurements in the UV. One of the purposes of the UV measurements will be to identify and constrain absorption by aerosols. Another purpose will be to retrieve absorption properties of colored dissolved organic matter (CDOM) in the ocean. However one particular aerosol species, i.e. brown carbon (BrC), has exhibits absorption properties that are identical to those of CDOM. Hence one of the outstanding questions for the PACE mission is whether perturbations in BrC and CDOM can be distinguished. In this talk, we will review the absorption properties of both these constituents, and discuss simulations for PACE-like observations off the coast of West Africa. We will use ModelE computations to obtain realistic composition and amount of aerosols, and SeaWiFS satellite retrievals to obtain realistic ocean color properties, for these PACE-like observations. We will then explore the impact of BrC and CDOM on PACE-like observations of total and polarized radiance in the UV.