scholarly journals Improvement in Wind Vector from UHF Wind Profiler Radarthrough Removing Ground Echo

2016 ◽  
Vol 25 (2) ◽  
pp. 267-280
Author(s):  
Kwang-Ho Kim ◽  
◽  
Park-Sa Kim ◽  
Min-Seong Kim ◽  
Dong-Hwan Kang ◽  
...  
Keyword(s):  
Wind Profiler ◽  
Wind Vector ◽  
Uhf Wind Profiler

Rain rate estimation by simplified method using UHF wind profiler measurement at KMITL

2000 ◽  
Author(s):  
Chaiwat Somboonlarp ◽  
Nipha Leelaruji ◽  
Narong Hemmakorn ◽  
Apinan Manyanon ◽  
Yuichi Ohno
Keyword(s):  
Rain Rate ◽  
Wind Profiler ◽  
Rate Estimation ◽  
Simplified Method ◽  
Uhf Wind Profiler

Turbulent Dissipation Rate In The Boundary Layer Via UHF Wind Profiler Doppler Spectral Width Measurements

2002 ◽  
Vol 103 (3) ◽  
pp. 361-389 ◽  
Author(s):  
Sandra Jacoby-Koaly ◽  
B. Campistron ◽  
S. Bernard ◽  
B. Bénech ◽  
F. Ardhuin-Girard ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Dissipation Rate ◽  
Spectral Width ◽  
Wind Profiler ◽  
Turbulent Dissipation ◽  
Turbulent Dissipation Rate ◽  
Width Measurements ◽  
Uhf Wind Profiler

scholarly journals Wind Structure in a Supercell Thunderstorm as Measured by a UHF Wind Profiler

2001 ◽  
Vol 129 (8) ◽  
pp. 1968-1986 ◽  
Author(s):  
Gregor S. Lehmiller ◽  
Howard B. Bluestein ◽  
Paul J. Neiman ◽  
F. Martin Ralph ◽  
Wayne F. Feltz
Keyword(s):  
Wind Profiler ◽  
Wind Structure ◽  
Supercell Thunderstorm ◽  
Uhf Wind Profiler

Diurnal and seasonal variability of TKE dissipation rate in the ABL over a tropical station using UHF wind profiler

2007 ◽  
Vol 69 (4-5) ◽  
pp. 419-430 ◽  
Author(s):  
Madhu Chandra Reddy Kalapureddy ◽  
K. Kishore Kumar ◽  
V. Sivakumar ◽  
A.K. Ghosh ◽  
A.R. Jain ◽  
...  
Keyword(s):  
Seasonal Variability ◽  
Dissipation Rate ◽  
Wind Profiler ◽  
Tke Dissipation Rate ◽  
Uhf Wind Profiler ◽  
Tropical Station

scholarly journals Preliminary observation of temperature profiles by radio acoustic sounding system (RASS) with a 1280 MHz lower atmospheric wind profiler at Gadanki, India

2012 ◽  
Vol 5 (3) ◽  
pp. 4447-4472 ◽  
Author(s):  
T. V. Chandrasekhar Sarma ◽  
P. Srinivasulu ◽  
T. Tsuda
Keyword(s):  
Boundary Layer ◽  
Planetary Boundary Layer ◽  
Atmospheric Temperature ◽  
Precipitation Event ◽  
Wind Profiler ◽  
Acoustic Sounding ◽  
Pulse Transmission ◽  
Mst Radar ◽  
Uhf Wind Profiler ◽  
Virtual Temperature

Abstract. A UHF wind profiler operating at 1280 MHz has been developed at NARL for atmospheric studies in the planetary boundary layer. In order to explore application of radio acoustic sounding system (RASS) technique to this profiler, a suitable acoustic attachment was designed and preliminary experiments were conducted on 27–30 August 2010. Height profiles of virtual temperature, Tv, in the planetary boundary layer were derived with 1 μs and 0.25 μs pulse transmission, corresponding to a height resolution of 150 m and about 40 m, respectively. Diurnal variation of Tv is clearly recognized, and perturbations of Tv are also seen in association with a precipitation event. Simultaneous profiles obtained from the MST Radar-RASS and an onsite 50 m tower demonstrate the capability to continuously profile the atmospheric temperature from near the ground to upper tropospheric altitudes.

A Combined Wind Profiler and Polarimetric Weather Radar Method for the Investigation of Precipitation and Vertical Velocities

2009 ◽  
Vol 26 (9) ◽  
pp. 1940-1955 ◽  
Author(s):  
Michihiro S. Teshiba ◽  
Phillip B. Chilson ◽  
Alexander V. Ryzhkov ◽  
Terry J. Schuur ◽  
Robert D. Palmer
Keyword(s):  
Weather Radar ◽  
Terminal Velocity ◽  
Doppler Velocity ◽  
Drop Diameter ◽  
Wind Profiler ◽  
Rain Drop ◽  
Air Motion ◽  
Polarimetric Weather Radar ◽  
Uhf Wind Profiler ◽  
Differential Reflectivity

Abstract A method is presented by which combined S-band polarimetric weather radar and UHF wind profiler observations of precipitation can be used to extract the properties of liquid phase hydrometeors and the vertical velocity of the air through which they are falling. Doppler spectra, which contain the air motion and/or fall speed of hydrometeors, are estimated using the vertically pointing wind profiler. Complementary to these observations, spectra of rain drop size distribution (DSD) are simulated by several parameters as related to the DSD, which are estimated through the two polarimetric parameters of radar reflectivity (ZH) and differential reflectivity (ZDR) from the scanning weather radar. These DSDs are then mapped into equivalent Doppler spectra (fall speeds) using an assumed relationship between the equivolume drop diameter and the drop’s terminal velocity. The method is applied to a set of observations collected on 11 March 2007 in central Oklahoma. In areas of stratiform precipitation, where the vertical wind motion is expected to be small, it was found that the fall speeds obtained from the spectra of the rain DSD agree well with those of the Doppler velocity estimated with the profiler. For those cases when the shapes of the Doppler spectra are found to be similar in shape but shifted in velocity, the velocity offset is attributed to vertical air motion. In convective rainfall, the Doppler spectra of the rain DSD and the Doppler velocity can exhibit significant differences owing to vertical air motions together with atmospheric turbulence. Overall, it was found that the height dependencies of Doppler spectra measured by the profiler combined with vertical profiles of Z, ZDR, and the cross correlation (ρHV) as well as the estimated spectra of raindrop physical terminal fall speeds from the polarimetric radar provide unique insight into the microphysics of precipitation. Vertical air motions (updrafts/downdrafts) can be estimated using such combined measurements.

scholarly journals Quality Evaluation of Wind Vectors from UHF Wind Profiler using Radiosonde Measurements

2015 ◽  
Vol 24 (1) ◽  
pp. 133-150 ◽  
Author(s):  
Kwang-Ho Kim ◽  
Min-Seong Kim ◽  
Seong-Woon Seo ◽  
Park-Sa Kim ◽  
Dong-Hwan Kang ◽  
...  
Keyword(s):  
Quality Evaluation ◽  
Wind Profiler ◽  
Uhf Wind Profiler

scholarly journals A one year comparison of 482 MHz radar wind profiler, RS92-SGP Radiosonde and 1.5 μm Doppler Lidar wind measurements

2014 ◽  
Vol 7 (11) ◽  
pp. 11439-11479 ◽  
Author(s):  
E. Päschke ◽  
R. Leinweber ◽  
V. Lehmann
Keyword(s):  
Signal To Noise Ratio ◽  
Elevation Angle ◽  
Wind Profiler ◽  
Wind Vector ◽  
Doppler Lidar ◽  
Operational Testing ◽  
Average Wind ◽  
Wind Measurements ◽  
One Year ◽  
Scan Pattern

Abstract. We present the results of a one-year quasi-operational testing of the 1.5 μm StreamLine Doppler lidar developed by Halo Photonics from 2 October 2012 to 2 October 2013. The system was configured to continuously perform a velocity-azimuth display (VAD) scan pattern using 24 azimuthal directions with a constant beam elevation angle of 75°. Radial wind estimates were selected using a rather conservative signal-to-noise ratio (SNR) based threshold of −18.2 dB (0.015). A 30 min average wind vector was calculated based on the assumption of a horizontally homogeneous wind field through a singular-value decomposed Moore–Penrose pseudoinverse of the overdetermined linear system. A strategy for a quality control of the retrieved wind vector components is outlined which is used to ensure consistency between the retrieved winds and the assumptions inherent to the employed wind vector retrieval. Finally, the lidar measurements are compared with operational data from a collocated 482 MHz radar wind profiler running in a four-beam Doppler beam swinging (DBS) mode and winds from operational radiosonde measurements. The intercomparisons show that the Doppler lidar is a reliable system for operational wind measurements in the atmospheric boundary layer (ABL).

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