Simultaneous Observations of Thin Humidity Gradients in the Lower Troposphere with a Raman Lidar and the Very High-Frequency Middle- and Upper-Atmosphere Radar

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  • H. Luce
    Laboratoire de Sondages Electromagnétiques de l’Environnement Terrestre, CNRS, Université du Sud Toulon-Var, La Garde, France
  • T. Takai
    Denso Corporation, Kariya, Aichi, Japan
  • T. Nakamura
    Space and Upper Atmospheric Science Group, National Institute of Polar Research, Tokyo, Japan
  • M. Yamamoto
    Research Institute for Sustainable Humanosphere, Kyoto University, Uji, Japan
  • S. Fukao
    Department of Space Communication Engineering, Fukui University of Technology, Fukui, Japan

書誌事項

公開日
2010-05-01
DOI
  • 10.1175/2010jtecha1372.1
公開者
American Meteorological Society

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説明

<jats:title>Abstract</jats:title> <jats:p>Humidity is, among other things, a key parameter in the evolution of atmospheric dynamics and in the formation of clouds and precipitation through latent heat release. The continuous observation of its vertical distribution is thus important in meteorology. In the absence of convection, humidity in the lower troposphere is distributed into nearly horizontally stratified layers. The thin humidity gradients at the edges of these layers are known to be the main cause of very high-frequency (VHF) stratosphere–troposphere (ST) radar backscatter in the lower troposphere. This property has been experimentally demonstrated many times in the literature from comparisons between balloon measurements and low-resolution radar observations. In the present work, original results of comparisons between Raman lidar measurements of water vapor and middle- and upper-atmosphere (MU) radar measurements of echo power using a range-imaging technique are shown at high spatial and temporal resolutions (∼50 m, ∼20 s). Other tremendous advantages of such comparisons are the simultaneity, time continuity, and colocalization of the lidar and radar measurements. The results show that the radar can be used for continuously monitoring the thin positive and negative gradients of humidity when operated in range-imaging mode. With additional information from balloon measurements, it would be possible to retrieve humidity profiles in the lower troposphere at an unprecedented vertical and time resolution.</jats:p>

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