Estimation of Turbulence Parameters in the Lower Troposphere from ShUREX (2016–2017) UAV Data
Université de Toulon, Aix-Marseille University, CNRS IRD, MIO, UM110, 83041 Toulon, France
Department of Aerospace Engineering Sciences, University of Colorado, Boulder, CO 80309, USA
Research Institute for Sustainable Humanosphere, Kyoto University, Kyoto 611-0011, Japan
Author to whom correspondence should be addressed.
Received: 21 May 2019 / Revised: 24 June 2019 / Accepted: 3 July 2019 / Published: 11 July 2019
PDF [7675 KB, uploaded 11 July 2019]
Turbulence parameters in the lower troposphere (up to ~4.5 km) are estimated from measurements of high-resolution and fast-response cold-wire temperature and Pitot tube velocity from sensors onboard DataHawk Unmanned Aerial Vehicles (UAVs) operated at the Shigaraki Middle and Upper atmosphere (MU) Observatory during two ShUREX (Shigaraki UAV Radar Experiment) campaigns in 2016 and 2017. The practical processing methods used for estimating turbulence kinetic energy dissipation rate
and temperature structure function parameter
from one-dimensional wind and temperature frequency spectra are first described in detail. Both are based on the identification of inertial (−5/3) subranges in respective spectra. Using a formulation relating
valid for Kolmogorov turbulence in steady state, the flux Richardson number
and the mixing efficiency
are then estimated. The statistical analysis confirms the variability of
, respectively, values close to the canonical values found from some earlier experimental and theoretical studies of both the atmosphere and the oceans. The relevance of the interpretation of the inertial subranges in terms of Kolmogorov turbulence is confirmed by assessing the consistency of additional parameters, the Ozmidov length scale
, the buoyancy Reynolds number
, and the gradient Richardson number Ri
. Finally, a case study is presented showing altitude differences between the peaks of
, suggesting turbulent stirring at the margin of a stable temperature gradient sheet. The possible contribution of this sheet and layer structure on clear air radar backscattering mechanisms is examined.
This is an open access article distributed under the Creative Commons Attribution License
which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
Share & Cite This Article
MDPI and ACS Style
Luce, H.; Kantha, L.; Hashiguchi, H.; Lawrence, D. Estimation of Turbulence Parameters in the Lower Troposphere from ShUREX (2016–2017) UAV Data. Atmosphere 2019, 10, 384.
Luce H, Kantha L, Hashiguchi H, Lawrence D. Estimation of Turbulence Parameters in the Lower Troposphere from ShUREX (2016–2017) UAV Data. Atmosphere. 2019; 10(7):384.
Luce, Hubert; Kantha, Lakshmi; Hashiguchi, Hiroyuki; Lawrence, Dale. 2019. "Estimation of Turbulence Parameters in the Lower Troposphere from ShUREX (2016–2017) UAV Data." Atmosphere 10, no. 7: 384.
Show more citation formats
Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.
[Return to top]
For more information on the journal statistics, click here
Multiple requests from the same IP address are counted as one view.