The El Chichon volcanic cloud in the stratosphere - Lidar observation at Fukuoka and numerical simulation

Details The El Chichon volcanic cloud in the stratosphere - Lidar observation at Fukuoka and numerical simulation The El Chichon volcanic cloud in the stratosphere - Lidar observation at Fukuoka and numerical simulation

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jatp...46.1121s&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 46, Dec. 1984, p. 1121-1146.

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Clouds, Ejecta, Optical Radar, Radar Measurement, Stratosphere, Volcanoes, Atmospheric Chemistry, Atmospheric Stratification, Backscattering, Laser Applications, Mexico, Vertical Distribution

Scientific paper

The El Chichon April 1982 eruption's stratospheric cloud was routinely observed by a Nd:YAG lidar system. These observations, together with numerical calculations, indicate that the stratospheric vertical eddy diffusion coefficient in the summer easterly region is of the order of 100 sq cm/sec or less. It is also predicted on these bases that the stratospheric materials of tropospheric origin should be found in smaller concentrations in the summer easterly wind region. It is suggested that the observed reincrease of the integrated backscattering coefficient in September-December 1982 was not caused only by the delayed oxidation of injected SO2, but also by seasonal variation of the meridional advective and diffusive transport from lower to higher latitudes. Nucleation within the cloud renders the simulated results more plausible, in view of observed results.

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