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Proceedings Paper

Climatology of the middle-atmosphere temperature from long-term lidar measurements at mid and low latitudes
Author(s): I. Stuart McDermid; Thierry Leblanc; Philippe Keckhut; Alain Hauchecorne; Chiao Yao She; David A. Krueger
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Paper Abstract

Long term measurements from several lidar instruments, located at 44.0 degrees N, 40.6 degrees N, 34.4 degrees N, and 19.5 degrees N, were used to develop a new climatology of the middle atmosphere temperature. For each instrument, the measurements on every day of the year over the entire record were averaged to build a composite year of temperature profiles. The lidar climatologies were compared to the CIRA-86 model which appears to be systematically too cold between 90 and 95 km, by greater than or equal to 20 K, and possibly 6 - 8 K too warm around 80 km, making its use as a reference questionable at these altitudes. The annual and semi-annual components of the seasonal variability and the 2- to 33-day period variability were also investigated. An annual cycle with 6 - 7 K amplitude in the upper stratosphere, increasing to 15 - 20 K at 80 km, is observed at mid-latitudes. At lower latitudes, a semiannual oscillation (SAO) propagates downward from 85 to 30 km and is characterized by a stronger first cycle than the second (4 K and 2 K amplitude). The 2- to 33- day variability at mid-latitudes shows a maximum during winter around 40 km and in the mesosphere. Finally, sudden seasonal transitions, highly consistent between all instruments, have been observed, in particular in the early winter mid-latitudes with a two-step warming of the mesosphere between 65 and 85 km.

Paper Details

Date Published: 19 August 1998
PDF: 12 pages
Proc. SPIE 3504, Optical Remote Sensing for Industry and Environmental Monitoring, (19 August 1998); doi: 10.1117/12.319557
Show Author Affiliations
I. Stuart McDermid, Jet Propulsion Lab. (United States)
Thierry Leblanc, Jet Propulsion Lab. (United States)
Philippe Keckhut, CNRS Service d'Aeronomie (France)
Alain Hauchecorne, CNRS Service d'Aeronomie (France)
Chiao Yao She, Colorado State Univ. (United States)
David A. Krueger, Colorado State Univ. (United States)

Published in SPIE Proceedings Vol. 3504:
Optical Remote Sensing for Industry and Environmental Monitoring
Upendra N. Singh; Huanling Hu; Gengchen Wang, Editor(s)

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