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Absorption line spectroscopy offers one of the best opportunities toconstrain the properties of galactic outflows and the environment of thecircumgalactic medium. Extracting physical information from line profiles isdifficult, however, for the physics governing the underlying radiation transferis complicated and depends on many different parameters. Idealized analyticalmodels are necessary to constrain the large parameter spaces efficiently, butare typically plagued by model degeneracy and systematic errors. Comparisontests with idealized numerical radiation transfer codes offer an excellentopportunity to confront both of these issues. In this paper, we present adetailed comparison between SALT, an analytical radiation transfer model forpredicting UV spectra of galactic outflows, with the numerical radiationtransfer software, RASCAS. Our analysis has lead to upgrades to both modelsincluding an improved derivation of SALT and a customizable adaptive meshrefinement routine for RASCAS. We explore how well SALT, when paired with aMonte Carlo fitting procedure, can recover flow parameters from non-turbulentand turbulent flows. When the velocity and density gradients are excluded, wefind that flow parameters are well recovered from high resolution (20 $\rm{km}$$\rm{s}^{-1}$) data and moderately well from medium resolution (100 $\rm{km}$$\rm{s}^{-1}$) data without turbulence at a S/N = 10, while derived quantities(e.g., mass outflow rates, column density, etc.) are well recovered at allresolutions. In the turbulent case, biased errors emerge in the recovery ofindividual parameters, but derived quantities are still well recovered.

Testing SALT Approximations with Numerical Radiation Transfer Code Part 1: Validity and Applicability