%0 Journal Article
%T Comparisons between high-resolution profiles of squared refractive index gradient <i>M</i><sup>2</sup> measured by the Middle and Upper Atmosphere Radar and unmanned aerial vehicles (UAVs) during the Shigaraki UAV-Radar Experiment 2015 campaign
%+ Laboratoire de sondages électromagnétiques de l'environnement terrestre (LSEET)
%+ Institut méditerranéen d'océanologie (MIO)
%+ Department of Aerospace Engineering Sciences
%+ Research Institute for Sustainable Humanosphere (RISH)
%A Luce, Hubert
%A Kantha, Lakshmi
%A Hashiguchi, Hiroyuki
%A Lawrence, Dale
%A Yabuki, Masanori
%A Tsuda, Toshitaka
%A Mixa, Tyler
%< avec comité de lecture
%@ 0992-7689
%J Annales Geophysicae
%I European Geosciences Union
%V 35
%N 3
%P 423 - 441
%8 2017
%D 2017
%R 10.5194/angeo-35-423-2017
%Z Life Sciences [q-bio]/Ecology, environmentJournal articles
%X New comparisons between the square of the generalized potential refractive index gradient M 2 , estimated from the very high-frequency (VHF) Middle and Upper Atmosphere (MU) Radar, located at Shigaraki, Japan, and un-manned aerial vehicle (UAV) measurements are presented. These comparisons were performed at unprecedented temporal and range resolutions (1–4 min and ∼ 20 m, respectively) in the altitude range ∼ 1.27–4.5 km from simultaneous and nearly collocated measurements made during the ShUREX (Shigaraki UAV-Radar Experiment) 2015 campaign. Seven consecutive UAV flights made during daytime on 7 June 2015 were used for this purpose. The MU Radar was operated in range imaging mode for improving the range resolution at vertical incidence (typically a few tens of meters). The proportionality of the radar echo power to M 2 is reported for the first time at such high time and range resolutions for stratified conditions for which Fresnel scatter or a reflection mechanism is expected. In more complex features obtained for a range of turbulent layers generated by shear instabilities or associated with convective cloud cells, M 2 estimated from UAV data does not reproduce observed radar echo power profiles. Proposed interpretations of this discrepancy are presented.
%G English
%2 https://amu.hal.science/hal-01621967/document
%2 https://amu.hal.science/hal-01621967/file/angeo-35-423-2017.pdf
%L hal-01621967
%U https://amu.hal.science/hal-01621967
%~ IRD
%~ INSU
%~ UNIV-TLN
%~ CNRS
%~ UNIV-AMU
%~ MIO
%~ OSU-INSTITUT-PYTHEAS
%~ GIP-BE
%~ LSEET
%~ MIO-OPLC