ST radar evaluation of the standard deviation of the air vertical velocity perturbed by the local orography

Physics

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Scientific paper

During several campaigns in France, the same clear-air Doppler VHF ST radar `Provence' has been configured to explore lee wave effects on the air vertical velocity. Very different conditions of lee wave occurrence are related to the change of orographic conditions between the different stations and around a specific station. For each case, the standard deviation of the time fluctuations of the air vertical velocity in the troposphere above the radar has been evaluated and related to the height-range of the upstream orography. This evaluation was also made using results already published and obtained elsewhere by the same kind of radars. Using 15 available cases, the standard deviation of the vertical velocity is found to be related mainly to the upstream orography height-range. This result makes possible the evaluation of the vertical velocity fluctuation range by the simple knowledge of the upstream orography in the case of lee wave occurrence.

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