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Title:Lidar observations of polar mesospheric clouds at South Pole: Diurnal variations
Author(s):Chu, Xinzhao; Gardner, Chester S.; Papen, George
Subject(s):South Pole
Polar mesospheric clouds
Geographic Coverage:South Pole
Abstract:Polar mesospheric clouds (PMCs) were observed by a ground-based Fe Boltzmann temperature lidar for 65 h on 17-19 and 24-26 January 2000 above the geographic South Pole. The mean PMC backscatter ratio, volume backscatter coetficient, total backscatter coetficient, layer centroid altitude, and layer rms width are 53.5, 2.9x10 -9 m-Xsr -x, 4.3x10 -6 sr -x, 85.37 km, and 0.78 km, respectively. Strong semidiurnal and diurnal oscillations were observed in the PMC backscatter ratio, volume backscatter coetficient, total backscatter coetficient, and centroid altitude. The oscillations are all maximum around 0630 and 1900 UT. The variations appear to be linked to vertical advection of the PMC scattering layers by a persistent oscillation in the vertical wind velocity. Scattering is strongest when the PMCs are highest which suggests that the colder temperatures at higher altitudes near the mesopause facilitate the formation of larger PMC particles.
Issue Date:2001-05-15
Publisher:American Geophysical Union
Citation Info:X. Chu, C. S. Gardner, and G. C. Papen, “Lidar observations of polar mesospheric clouds at South Pole: Diurnal variations”, Geophys. Res. Lett, Vol. 28, No. 10, 1937-1940, 15 May 2001. DOI: 10.1029/2000GL012525
Genre:Article
Type:Text
Language:English
URI:http://hdl.handle.net/2142/73143
DOI:10.1029/2000GL012525
Rights Information:Copyright 2001 American Geophysical Union
Date Available in IDEALS:2015-01-30


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