Abstract
Temperature and ozone profiles were observed with the NIES ozone lidar system during the DYANA campaign from January 15th to March 15th at Tsukuba (36°E, 140°N). Temperature profiles from 30km to 90km and ozone profiles from 20km to 45km were obtained. The mesospheric temperature profiles were highly variable and deviations from the NASA88 model atmosphere were large in January and February, but the deviations were small in March 1990. Especially, conspicuous variations of the mesospheric temperature profiles, rapid increase around 55km and rapid decrease around 75km, were observed during the period from January 24th to 26th. We also observed layers with large vertical temperature gradients close to the adiabatic lapse rate above clear inversion layers in the middle mesosphere on January 17th and February 17th. The observed ozone number densities were>10% lower than the ozone sonde data averaged over 22 years at 25km and 30km on January 17th, 25th, 26th. The deviations from the averaged ozone sonde data were small on February 5th, March 8th, 10th and 13th.
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