This article is so close to what I am asking about, but in the end it's once again about an unexpected increase in warming. Yet you can see that the information probably exists somewhere....

> ...analysed[sic] data on ship emissions as a model system for quantifying the climatic effect of human aerosol emissions in general.

This analysis could produce a whole set of factors and a relatively up-to-date numerical characterization of their impact. Some will be higher, but some may be lower (which also matters for planning!). Instead we get a report on a single factor that's most alarming.