scholarly journals Mass estimations of ejecta from Strombolian explosions by inversion of Doppler radar measurements

2008 ◽  
Vol 113 (B10) ◽  
Author(s):  
Mathieu Gouhier ◽  
Franck Donnadieu
Keyword(s):  
Doppler Radar ◽  
Radar Measurements ◽  
Strombolian Explosions

scholarly journals The Coplane Analysis Technique for Three-Dimensional Wind Retrieval Using the HIWRAP Airborne Doppler Radar

2015 ◽  
Vol 54 (3) ◽  
pp. 605-623 ◽  
Author(s):  
Anthony C. Didlake ◽  
Gerald M. Heymsfield ◽  
Lin Tian ◽  
Stephen R. Guimond
Keyword(s):  
Global Optimization ◽  
Doppler Radar ◽  
Three Dimensional ◽  
Optimization Method ◽  
Vertical Wind ◽  
Wind Component ◽  
Global Optimization Method ◽  
Analysis Technique ◽  
Radar Measurements ◽  
Cross Track

AbstractThe coplane analysis technique for mapping the three-dimensional wind field of precipitating systems is applied to the NASA High-Altitude Wind and Rain Airborne Profiler (HIWRAP). HIWRAP is a dual-frequency Doppler radar system with two downward-pointing and conically scanning beams. The coplane technique interpolates radar measurements onto a natural coordinate frame, directly solves for two wind components, and integrates the mass continuity equation to retrieve the unobserved third wind component. This technique is tested using a model simulation of a hurricane and compared with a global optimization retrieval. The coplane method produced lower errors for the cross-track and vertical wind components, while the global optimization method produced lower errors for the along-track wind component. Cross-track and vertical wind errors were dependent upon the accuracy of the estimated boundary condition winds near the surface and at nadir, which were derived by making certain assumptions about the vertical velocity field. The coplane technique was then applied successfully to HIWRAP observations of Hurricane Ingrid (2013). Unlike the global optimization method, the coplane analysis allows for a transparent connection between the radar observations and specific analysis results. With this ability, small-scale features can be analyzed more adequately and erroneous radar measurements can be identified more easily.

NSSL Dual-Doppler Radar Measurements in Tornadic Storms: a Preview

1975 ◽  
Vol 56 (5) ◽  
pp. 524-526 ◽  
Author(s):  
Rodger A. Brown ◽  
Donald W. Burgess ◽  
John K. Carter ◽  
Leslie R. Lemon ◽  
Dale Sirmans
Keyword(s):  
Doppler Radar ◽  
Radar Measurements ◽  
Tornadic Storms ◽  
Dual Doppler Radar

Side-looking ADCP and Doppler radar measurements across a coastal front

2000 ◽  
Vol 25 (4) ◽  
pp. 423-429 ◽  
Author(s):  
C.L. Trump ◽  
N. Allan ◽  
G.O. Marmorino
Keyword(s):  
Doppler Radar ◽  
Radar Measurements ◽  
Coastal Front

scholarly journals Velocity-Based EDR Retrieval Techniques Applied to Doppler Radar Measurements from Rain: Two Case Studies

2019 ◽  
Vol 36 (9) ◽  
pp. 1693-1711 ◽  
Author(s):  
A. C. P. Oude Nijhuis ◽  
C. M. H. Unal ◽  
O. A. Krasnov ◽  
H. W. J. Russchenberg ◽  
A. G. Yarovoy
Keyword(s):  
Case Studies ◽  
Doppler Radar ◽  
Energy Dissipation Rate ◽  
Accurate Estimation ◽  
Retrieval Technique ◽  
Sonic Anemometers ◽  
Radar Measurements ◽  
Rain Events ◽  
Kolmogorov Constant

In this article, five velocity-based energy dissipation rate (EDR) retrieval techniques are assessed. The EDR retrieval techniques are applied to Doppler measurements from Transportable Atmospheric Radar (TARA)—a precipitation profiling radar—operating in the vertically fixed-pointing mode. A generalized formula for the Kolmogorov constant is derived, which gives potential for the application of the EDR retrieval techniques to any radar line of sight (LOS). Two case studies are discussed that contain rain events of about 2 and 18 h, respectively. The EDR values retrieved from the radar are compared to in situ EDR values from collocated sonic anemometers. For the two case studies, a correlation coefficient of 0.79 was found for the wind speed variance (WSV) EDR retrieval technique, which uses 3D wind vectors as input and has a total sampling time of 10 min. From this comparison it is concluded that the radar is able to measure EDR with a reasonable accuracy. Almost no correlation was found for the vertical wind velocity variance (VWVV) EDR retrieval technique, as it was not possible to sufficiently separate the turbulence dynamics contribution to the radar Doppler mean velocities from the velocity contribution of falling raindrops. An important cause of the discrepancies between radar and in situ EDR values is thus due to insufficient accurate estimation of vertical air velocities.

Investigations of a Winter Mountain Storm in Utah. Part III: Single-Doppler Radar Measurements of Turbulence

1991 ◽  
Vol 48 (10) ◽  
pp. 1306-1318 ◽  
Author(s):  
Bernard Campistron ◽  
Arlen W. Huggins ◽  
Alexis B. Long
Keyword(s):  
Doppler Radar ◽  
Radar Measurements

Preliminary results of 3D hurricane boundary layer wind estimation with multilook Doppler radar measurements of the precipitation

2005 ◽  
Author(s):  
Yinghai Ke ◽  
Xuehu Zhang ◽  
Xiuwan Chen ◽  
Jilong Yang ◽  
Daniel Esteban ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Doppler Radar ◽  
Wind Estimation ◽  
Preliminary Results ◽  
Radar Measurements ◽  
Hurricane Boundary Layer

scholarly journals Sband Doppler radar measurements of bathymetry, wave energy fluxes, and dissipation across an offshore bar

1998 ◽  
Vol 103 (C9) ◽  
pp. 18779-18789 ◽  
Author(s):  
John A. McGregor ◽  
E. Murray Poulter ◽  
Murray J. Smith
Keyword(s):  
Wave Energy ◽  
Doppler Radar ◽  
Energy Fluxes ◽  
Radar Measurements
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