Q4. The next step is to measure multiple properties of individual particles

Q4. What would we like to know? What are the most promising techniques for doing so? What will we do with the data?

George says (http://wp.me/p7ffKH-B): Way back when, Vern Asper measured both particle size and settling velocity on the same particles. More recently, Andrew McD has been measuring particle concentrations and fluxes on two different sets of particles and using the results to infer velocity as a function of size. Is there a way to measure both properties on the same particles so that we could perform more sophisticated analyses?