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19 August 1998 Climatology of the middle-atmosphere temperature from long-term lidar measurements at mid and low latitudes
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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.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
I. Stuart McDermid, Thierry Leblanc, Philippe Keckhut, Alain Hauchecorne, Chiao Yao She, and David A. Krueger "Climatology of the middle-atmosphere temperature from long-term lidar measurements at mid and low latitudes", Proc. SPIE 3504, Optical Remote Sensing for Industry and Environmental Monitoring, (19 August 1998);

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