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• W2044426006 startingPage "16875" @default.
• W2044426006 abstract "Lidar measurements of mesospheric Fe were conducted for 325 h during 75 nights at Urbana, Ill. (40°N, 88°W), in fall 1989 and from spring 1991 through summer 1992. The Fe layer abundance and root‐mean‐square (RMS) width have strong annual variations, with minima in summer. The abundance varied from 3.5 × 10 9 to 25 × 10 9 cm −2 with a mean of 10.6 × 10 9 cm −2 , and the RMS width varied from 2.3 to 5.3 km with a mean of 3.4 km. The centroid height of the Fe layer has a strong semiannual variation, with minima at the solstices. The centroid varies from 86.0 to 90.3 km and has a mean of 88.1 km. Sporadic Fe (Fe s ) layers were present about 27% of the total observation time. The Fe measurements are compared with the extensive Na layer observations obtained during the past decade at Urbana and with common volume observations made simultaneously on 24 nights with a Na temperature lidar. The mean Fe column abundance is approximately twice the mean Na column abundance. The Fe layer centroid height is also on average nearly 4 km lower and the RMS width is approximately 24% narrower than the corresponding Na layer parameters. A chemical model of the mesospheric Fe layer is described and compared to various experimental results. The reaction of Fe with O 3 to form FeO on the bottom side of the layer and the subsequent reaction of FeO with CO 2 to form FeCO 3 appear to be the dominant chemical sinks for Fe. The temperature dependency of the latter reaction may explain the annual variation in the column abundance. The lidar observations and the chemical model calculations suggest that the expected cooling of the mesopause region by approximately 10 K due to the doubling of CO 2 and other greenhouse gases during the next century may reduce the mean Fe abundance by as much as 45% and the mean Na abundance by 55%." @default.
• W2044426006 created "2016-06-24" @default.
• W2044426006 creator A5004669093 @default.
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• W2044426006 date "1993-09-20" @default.
• W2044426006 modified "2023-10-14" @default.
• W2044426006 title "Structure and seasonal variability of the nighttime mesospheric Fe layer at midlatitudes" @default.
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• W2044426006 doi "https://doi.org/10.1029/93jd01225" @default.
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