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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Volume 6, issue 3
Atmos. Meas. Tech., 6, 697–702, 2013
https://doi.org/10.5194/amt-6-697-2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.
Atmos. Meas. Tech., 6, 697–702, 2013
https://doi.org/10.5194/amt-6-697-2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 14 Mar 2013

Research article | 14 Mar 2013

On the effect of moisture on the detection of tropospheric turbulence from in situ measurements

R. Wilson1, H. Luce2, H. Hashiguchi3, M. Shiotani3, and F. Dalaudier1 R. Wilson et al.
  • 1UPMC Univ Paris 06, LATMOS-IPSL, UMR8190, CNRS/INSU, 75005, Paris, France
  • 2Univ. du Sud Toulon-Var, 83957, La Garde Cedex, France
  • 3Research Institute for Sustainable Humanosphere, Kyoto University, Uji, Japan

Abstract. The present paper addresses the detection of turbulence based on the Thorpe (1977) method applied to an atmosphere where saturation of water vapor occurs. The detection method proposed by Thorpe relies on the sorting in ascending order of a measured profile of a variable conserved through adiabatic processes, (e.g. potential temperature). For saturated air, the reordering should be applied to a moist-conservative potential temperature, θm, which is analogous to potential temperature for a dry (subsaturated) atmosphere. Here, θm is estimated from the Brunt–Väisälä frequency derived by Lalas and Einaudi (1974) in a saturated atmosphere. The application to balloon data shows that the effective turbulent fraction of the troposphere can dramatically increase when saturation is taken into account. Preliminary results of comparisons with data simultaneously collected from the VHF Middle and Upper atmosphere radar (MUR, Japan) seem to give credence to the proposed approach.

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