par Volon, Carole 
;Lavreau, Johannes ;Bernard, Alain
Référence Proceedings of SPIE - The International Society for Optical Engineering, 2309, page (318-326)
Publication Publié, 1994-12
;Lavreau, Johannes ;Bernard, Alain Référence Proceedings of SPIE - The International Society for Optical Engineering, 2309, page (318-326)
Publication Publié, 1994-12
Article révisé par les pairs
| Résumé : | The Mount Pinatubo eruption (15 °07'N, 120 °20'E) in the Philippines of June 1991 was among the largest volcanic eruptions of this century in term of effects on stratospheric aerosols. The activity culminated in a paroxysmal eruption on June 15th and developed a giant umbrella cloud which introduced a large amount of ashes and gases into the stratosphere. The high frequency of coverage of the NOAA (USA) and GMS (Japan) weather satellite enables a global monitoring of the rise and spreading dynamics of the Pinatubo volcanic cloud into the atmosphere. By integrating the maximum eruption height and the spreading rate over time, the total volume of pyroclastic material has been estimated to range between 3 and 4Km3. Image processing techniques such as difference T4-T5 and Principal Component Analysis have been applied the discrimination between volcanic cloud, ice cloud (cirrus) and clouds containing water vapor and water droplets. These detection techniques provide an operational tool for tracking the horizontal dispersion. The results can be used in the fields of monitoring long distance transport of the volcanic cloud over land and sea, aircraft safety and global atmospherical impact. |
