Lidar observations of atmospheric aerosols following the 1980 eruption of Mt. St. Helens. I

Details Lidar observations of atmospheric aerosols following the 1980 eruption of Mt. St. Helens. I Lidar observations of atmospheric aerosols following the 1980 eruption of Mt. St. Helens. I

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jatp...46.1147h&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 46, Dec. 1984, p. 1147-1157.

Physics

Aerosols, Atmospheric Composition, Optical Radar, Radar Measurement, Volcanoes, Japan, Stratosphere, Time Response, Two Dimensional Models, Washington, Yag Lasers

Scientific paper

A significant increase and subsequent variations of stratospheric aerosols caused by the eruption of Mt. St. Helens on May 18, 1980 have been observed using YAG lidar at a wavelength of 1.06 microns for a period of one year at Fukuoka, Japan. The time variation of aerosols is compared with numerical results of two-dimensional model calculations, which show longer decay times, especially for column concentrations of aerosols. In the upper layer, transported by the easterly wind during summer, the effective vertical diffusion is quite small and this is explained, at least partly, by the influence of vertical shear of the easterly wind, which balances vertical eddy diffusion. Finally, it is suggested that the settling of giant particles might increase the precipitation near the Baiu front over Japan for July and August.

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