Toward an Observation of Volcanic ASH: Which Kind of Observation can be Made by Different Instruments

In the first part, this presentation describes how an intercomparison was conducted between several lidars and ceilometers, the processing algorithms used, the difficulties encountered and the method used to design an optimum volcanic ash detection network.In the second part, we describe the work progress of a feasibility study concerning a WMO intercomparison for volcanic ash detection that is beginning with experts and colleagues from many others countries.