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2. Morphology and dynamics of the Pinatubo aerosol layer in the northern hemisphere as detected from a ship-borne lidar

Abstract : Scattering ratios of the Pinatubo aerosol layer obtained by the ship-borne lidar of the Roscomhydromet of Russia on-board PROFESSOR ZUBOV are presented. During a campaign primarily in the low-latitude (8°N-43°N) Atlantic Ocean, 48 days of data were obtained within the 73 day period spanning 11-July and 21-September of 1991 [Avdyushin et al., 1992]. These data show the aerosol cloud to be primarily in the 16-27 km altitude region, with a high degree of variability in the vertical structure and in the longitudinal structure, and to a lesser degree, in the latitudinal structure. Scattering ratios of up to 50 were recorded in the multi-layered structure which was often observed. These are the first lidar observations showing a high degree of zonal variability of the vertical structure of the aerosol layer. We show the latitudinal range of the Pinatubo aerosol cloud in the northern hemisphere over a 2 month period and estimate the latitudinal dispersion rate for the months of the measurements to be approximately 5° latitude per month. A clear periodic variability was observed in the altitude structure during the entire data-set primarily within 8°N-22°N latitude and within the altitude region of the layer, from which a mean zonal wind profile was produced by a spectral analysis of the aerosol profiles.
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Bruno Nardi, Marie-Lise Chanin, Alain Hauchecorne, S. I. Avdyushin, G. F. Tulinov, et al.. 2. Morphology and dynamics of the Pinatubo aerosol layer in the northern hemisphere as detected from a ship-borne lidar. Geophysical Research Letters, American Geophysical Union, 1993, 20 (18), pp.1967-1970. ⟨10.1029/93GL00486⟩. ⟨insu-03132029⟩

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