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After the volcanic eruptions of Mt. El Chichon in Mexico, increase of stratospheric aerosols has been measured by a UV lidar at a wavelength of 340.5nm at Fukuoka (33.65*N, 130.35*E) since October 1982. The altitude of the maximum backscattering ratio (Rmax* 3.5) was 24km in October 1982, and it decreased to 20km in January 1983. The value of Rmax-1 decreased by a factor of 2.4, but large changes of aerosol backscattering coefficient integrated over an altitude range of 15-30km were not recognized during this period. A brief consideration is given on this lowering of the aerosol layer.

UV Lidar Measurement of Stratospheric Aerosol Layer Observational Results at Fukuoka (33.6&deg;N) during October 1982 through May 1983

UV Lidar Measurement of Stratospheric Aerosol Layer Observational Results at Fukuoka (33.6°N) during October 1982 through May 1983