Is the Ash Cloud radar reflective? And if so, at what radar frequencies? (cm, mm, etc)
At concentrations already known to affect jet turbine blades, radar detection is probably not feasible. The primary way that volcanic ash clouds are detected involves multiband infrared sensors. One example is discussed
here.
P.S. Anyone know what the Carbon Footprint of the Volcano is? How will Iceland offset its emissions?
Using a conventional definition of "carbon footprint" (
such as this one), the volcano's is nil, because its emissions are not the result of human activity. Furthermore, as long as significant ash releases continue to occur, the climatic impact of this erruption is self-offsetting because atmospheric ash has a stronger cooling effect than CO2 has a warming effect.