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Eyjafjallaj??kull volcano plume particle-type characterization from space-based multi-angle imaging

by R. A. Kahn, J. Limbacher
Atmospheric Chemistry and Physics ()
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The Multi-angle Imaging {SpectroRadiometer} ({MISR)} Research Aerosol algorithm makes it possible to study individual aerosol plumes in considerable detail. From the {MISR} data for two optically thick, near-source plumes of the spring 2010 Eyjafjallajokull volcano eruption, we map aerosol optical depth ({AOD)} gradients and changing aerosol particle types with this algorithm; several days downwind, we identify the occurrence of volcanic ash particles and retrieve {AOD}, demonstrating the extent and the limits of ash detection and mapping capability with the multi-angle, multi-spectral imaging data. Retrieved volcanic plume {AOD} and particle microphysical properties are distinct from background values near-source, as well as for over-water cases several days downwind. The results also provide some indication that as they evolve, plume particles brighten, and average particle size decreases. Such detailed mapping offers context for suborbital plume observations having much more limited sampling. The {MISR} Standard aerosol product identified similar trends in plume properties as the Research algorithm, though with much smaller differences compared to background, and it does not resolve plume structure. Better optical analogs of non-spherical volcanic ash, and coincident suborbital data to validate the satellite retrieval results, are the factors most important for further advancing the remote sensing of volcanic ash plumes from space.

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