Abstract: The surface speciation of Fe (2–10 nm) in dust samples was determined by X-ray photoelectron spectroscopy (XPS, Thermo Fisher Scientific K-Alpha+). Samples are from a BSNE dust collector installed in Tierra del Fuego (53.79ºS, 67.75ºW). The purpose of these measurements is to gauge bioavailability of Fe for ocean phytoplankton. Other Description: Cosentino, N. J., Ruiz-Etcheverry, L. A., Bia, G. L., Simonella, L. E., Coppo, R., Torre, G., et al. (2020). Does satellite chlorophyll-a respond to southernmost Patagonian dust? A multi-year, event-based approach. Journal of Geophysical Research: Biogeosciences, 125, e2020JG006073. https://doi.org/10.1029/2020JG006073