Retrieving Aerosol Parameters from Advanced Visible and Near Infrared Radiometer (AVNIR) multispectral images of Mount Etnau27s aerosol plume.

摘要

[ABSTRACT] Two multispectral images acquired on 28 March 1997 and 23 May 1997 by the Advanced Earth Observation Satellite (ADEOS) sensor AVNIR will be analysed in each of the four multispectral channels to retrieve aerosol optical thicknesses. The 28 March image provides the opportunity to retrieve optical parameters above snow, unvegetated basaltic lava flows and East Sicilian coastal waters. The heterogeneity of the plume can be clearly seen and could provide an insight into short term changes in rates of emission by Etnau27s active craters and near-source topographic effects. The 23 May image provides a useful comparison by showing two distinct plumes; a relatively homogeneous plume from the southern complex of the Bocca Nuova, Voragine and Southeast craters and a distinctive u27beadedu27 plume from the Northeast crater. Analysis of the separate plumes will allow remotely sensed data to help categorise the differing eruptive activity of the two sites. Proximal and distal sections through the plume may also provide insight into temporal evolution of the aerosol phase.