VHF radar, radiosondes and numerical modelling
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منابع مشابه
Short vertical-wavelength inertia-gravity waves generated by a jet–front system at Arctic latitudes – VHF radar, radiosondes and numerical modelling
Inertia-gravity waves with very short vertical wavelength (λz≤ 1000 m) are a very common feature of the lowermost stratosphere as observed by the 52 MHz radar ESRAD (Esrange MST radar) in northern Scandinavia (67.88 N, 21.10 E). The waves are seen most clearly in radar-derived profiles of buoyancy frequency (N ). Here, we present a case study of typical waves from 21 February to 22 February 200...
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A Japanese-French field campaign devoted to study small-scale turbulence and instabilities in the lower atmosphere was conducted in September 2011 for three weeks at Shigaraki MU observatory (34.85N, 136.15E; Japan). The VHF MU radar was operated in range imaging mode (e.g. Luce et al., 2001) for turbulence observations at high temporal ( 24 s) and high range (typically 30 m) resolutions. In ad...
متن کاملA statistical study of underestimates of wind speeds by VHF radar
Comparisons are made between horizontal wind measurements carried out using a VHF-radar system at Aberystwyth (52.4°N, 4.1°W) and radiosondes launched from Aberporth, some 50 km to the southwest. The radar wind results are derived from Doppler wind measurements at zenith angles of 6° in two orthogonal planes and in the vertical direction. Measurements on a total of 398 days over a 2-year period...
متن کاملSimultaneous observations of tropospheric turbulence from radiosondes using Thorpe analysis and the VHF MU radar
This paper deals with the detection and quantification of refractivity turbulence in the troposphere from radiosonde and very high frequency (VHF) band radar data. Balloon data processing methods based on Thorpe sorting and recently developed by Wilson et al. (2010, 2011, and 2013) can be applied for a direct identification of turbulent layers from the in situ profiles. The VHF band mid and upp...
متن کاملCharacterization of VHF radar observations associated with equatorial Spread F by narrow-band optical measurements
The VHF radars have been extensively used to investigate the structures and dynamics of equatorial Spread F (ESF) irregularities. However, unambiguous identification of the nature of the structures in terms of plasma depletion or enhancement requires another technique, as the return echo measured by VHF radar is proportional to the square of the electron density fluctuations. In order to addres...
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تاریخ انتشار 2013