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We characterize the influence that inclination has on the shape andnormalization in average dust attenuation curves derived from a sample of~10,000 local star-forming galaxies. To do this we utilize aperture-matchedmulti-wavelength data from the Galaxy Evolution Explorer, the Sloan Digital SkySurvey, the United Kingdom Infrared Telescope, and the Two Micron All-SkySurvey. We separate our sample into groups according to axial ratio (b/a) andobtain an estimate of their average total-to-selective attenuation$k(\lambda)$. The attenuation curves are found to be shallower at UVwavelengths with increasing inclination, whereas the shape at longerwavelengths remains unchanged. The highest inclination subpopulation (b/a<0.42)exhibits a NUV excess in its average selective attenuation, which, ifinterpreted as a 2175\AA\ feature, is best fit with a bump strength of 17-26%of the MW value. No excess is apparent in the average attenuation curve oflower inclination galaxies. The differential reddening between the stellarcontinuum and ionized gas is found to decrease with increasing inclination. Wefind that higher inclination galaxies have slightly higher values of $R_V$,although this is poorly constrained given the uncertainties. We outlinepossible explanations for these trends within a two component dust model (densecloud+diffuse dust) and find that they can be naturally explained if carriersof the 2175\AA\ feature are preferentially destroyed in star-forming regions(UV-bright regions).

Characterizing Dust Attenuation in Local Star Forming Galaxies: Inclination Effects and the 2175\AA\ Feature