Physics
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19..405k&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 19, Feb. 21, 1992, p. 405-408.
Physics
6
Abundance, Annual Variations, Atmospheric Chemistry, Mesosphere, Temperate Regions, Atmospheric Composition, Iron, Optical Radar, Sodium
Scientific paper
Lidar measurements of mesospheric Fe were conducted at Urbana, IL (40 deg N, 88 deg W) during the fall of 1989 and the spring through fall of 1991. The Fe layer abundance, centroid height and rms width varied substantially during the observation period with minimum values for all three parameters in summer. The abundance varied from 3.3 x 10 exp 9-25 x 10 exp 9/sq cm, the centroid height from 86.7-90.4 km and the rms width from 2.1-3.9 km. Sporadic Fe (FeS) layers were also frequently observed. The Fe measurements are compared with the extensive Na layer observations obtained during the past decade at Urbana. The mean Fe column abundance is more than twice the average Na column abundance. The Fe layer is also on average approximately 3.6 km lower and 32 percent narrower than the Na layer. The seasonal behavior of the Fe layer is discussed in light of preliminary temperature measurements of the mesopause region as well as a simple chemical model.
Gardner Chester S.
Kane Timothy J.
Mui Peter H.
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