How well can we measure the vertical profile of tropospheric aerosol extinction?

Schmid, B., Ferrare, R., Flynn, C. J., Elleman, R., Covert, D. S., Strawa, A. W., Welton, E., Turner, D., Jonsson, H. H., Redemann, J., Eilers, J., Ricci, K., Hallar, A. G., Clayton, M., Michalsky, I., Smirnov, A., Holben, B., Barnard, J. (2006). How well can we measure the vertical profile of tropospheric aerosol extinction?, J Geophys Res, doi: 2005.JD005837