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3D volcanic aerosol dispersal: a comparison between misr data and numerical simulations
Author(s)
Language
English
Obiettivo Specifico
3.6. Fisica del vulcanismo
Status
Published
JCR Journal
JCR Journal
Title of the book
Issue/vol(year)
/115 (2010)
Issued date
May 21, 2010
Abstract
The three dimensional reconstruction of volcanic plumes is a central goal to enhance our
understanding on dispersal processes. In this paper, we use data from the Multi-angle Imaging
SpectroRadiometer (MISR) on board NASA’s Terra spacecraft combined with a stereo matching
retrieval procedure. We show the potential of MISR in capturing important features of volcanic
plumes like column height, optical depth, type and shape of the finest particles of two highly
explosive eruptions occurring on Mt. Etna in 2001 and 2002. This work tests how tephra dispersal
models reconstruct the 3D shape of volcanic clouds. We compare MISR data with FALL3D, an
Eulerian model for the transport and deposition of volcanic ash and aerosols coupled with the
Weather Research and Forecasting (WRF) mesoscale meteorological model. Agreement between
simulations and MISR data is good regarding both events, although it could be improved by
increasing the accuracy of the meteorological data, a better constraint on volcanological input
parameters like the height of the eruptive column and improving our understanding of processes such
as aggregation phenomena and volcanic cloud microphysics.
understanding on dispersal processes. In this paper, we use data from the Multi-angle Imaging
SpectroRadiometer (MISR) on board NASA’s Terra spacecraft combined with a stereo matching
retrieval procedure. We show the potential of MISR in capturing important features of volcanic
plumes like column height, optical depth, type and shape of the finest particles of two highly
explosive eruptions occurring on Mt. Etna in 2001 and 2002. This work tests how tephra dispersal
models reconstruct the 3D shape of volcanic clouds. We compare MISR data with FALL3D, an
Eulerian model for the transport and deposition of volcanic ash and aerosols coupled with the
Weather Research and Forecasting (WRF) mesoscale meteorological model. Agreement between
simulations and MISR data is good regarding both events, although it could be improved by
increasing the accuracy of the meteorological data, a better constraint on volcanological input
parameters like the height of the eruptive column and improving our understanding of processes such
as aggregation phenomena and volcanic cloud microphysics.
Description
Accepted for publication in Journal of Geophysical Research. Copyright (2010) American Geophysical Union.
Type
article
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