Simpson has more than 40 papers in peer-reviewed journals.
* Simpson, W. R., L. Alvarez-Aviles, T. A. Douglas, M. Sturm, and F. Domine (2005), Halogens in the coastal snow pack near Barrow, Alaska: Evidence for active bromine air-snow chemistry during springtime, Geophys. Res. Lett., 32, L04811.
* Ayers, J. D., and W. R. Simpson (2006), Measurements of NO near Fairbanks, Alaska, J. Geophys. Res., 111, D14309.
* Ayers, J. D., R. L. Apodaca, W. R. Simpson, and D. S. Baer (2005), Off-axis cavity ringdown spectroscopy: application to atmospheric nitrate radical detection, Appl. Optics., 44, 7239-7242.