Ship-borne Aerosol Optical Depth (AOD) measurements obtained by a sunphotometer have been used to retrieve the Ångström wavelength exponent (α). These measurements were obtained in the Arabian Sea (AS), where the surrounded arid-region influence is expected, during the pre-monsoon season. Spectral variation of α is typically considered in this study. It is found that the polynomial fit becomes more accurate in the wavelength band 340–1020 nm rather than the 340–870 nm. The coarse-mode (positive curvature in the ln τ<sub>α</sub> vs ln λ) aerosols are mainly depicted in the Northern part of the AS closely associated with the nearby arid areas and fine-mode aerosols are mainly observed over the far and coastal AS regions. In the study period the mean AOD at 500 nm is 0.246±0.114 and the α<sub>340−1020</sub> is 0.904±0.186. The α<sub>340−870</sub> exhibits similar values (0.924±0.179), while significant differences revealed for the constant terms of the polynomial fit (<i>a</i><sub>1</sub> and (<i>a</i><sub>2</sub>) proportionally to the wavelength band used for their determination. Observed day-to-day variability in the aerosol load and optical properties are direct consequence of the local winds and air-mass trajectories along with the position of the ship.