scholarly journals HF radar observations of small-scale surface current variability in the Straits of Florida

2009 ◽  
Vol 114 (C8) ◽  
Author(s):  
A. B. Parks ◽  
L. K. Shay ◽  
W. E. Johns ◽  
J. Martinez-Pedraja ◽  
K.-W. Gurgel
Keyword(s):  
Surface Current ◽  
Hf Radar ◽  
Small Scale ◽  
Radar Observations ◽  
Straits Of Florida ◽  
Scale Surface

scholarly journals Blending Surface Currents from HF Radar Observations and Numerical Modeling: Tidal Hindcasts and Forecasts

2015 ◽  
Vol 32 (2) ◽  
pp. 256-281 ◽  
Author(s):  
E. V. Stanev ◽  
F. Ziemer ◽  
J. Schulz-Stellenfleth ◽  
J. Seemann ◽  
J. Staneva ◽  
...  
Keyword(s):  
Numerical Modeling ◽  
German Bight ◽  
Spatial Scales ◽  
Surface Current ◽  
Hf Radar ◽  
Optimal Interpolation ◽  
Kelvin Wave ◽  
Arctic Seas ◽  
Current Estimate ◽  
Radar Observations

AbstractAn observation network operating three Wellen Radars (WERAs) in the German Bight, which are part of the Coastal Observing System for Northern and Arctic Seas (COSYNA), is presented in detail. Major consideration is given to expanding the patchy observations over the entire German Bight on a 1-km grid and producing state estimates at intratidal scales, and 6- and 12-h forecasts. This was achieved with the help of the proposed spatiotemporal optimal interpolation (STOI) method, which efficiently uses observations and simulations from a free model run within an analysis window of one or two tidal cycles. In this way the method maximizes the use of available observations and can be considered as a step toward the “best surface current estimate.” The performance of the analysis was investigated based on the achieved reduction of the misfit between model and observations. The complex dynamics of the study domain was illustrated based on the spatial and temporal changes of tidal ellipses for the M2 and M4 constituents from HF radar observations. It was demonstrated that blending observations and numerical modeling facilitates physical interpretation of processes such as the nonlinear distortion of the Kelvin wave in the coastal zone and in particular in front of the Elbe and Weser estuaries. Comparisons with in situ data acquired outside the area covered by the HF radar demonstrated that the analysis method is able to propagate the HF radar information to larger spatial scales.

Ocean surface current prediction based on HF radar observations using trajectory-oriented association rule mining

2017 ◽  
Author(s):  
Kulsawasd Jitkajornwanich ◽  
Peerapon Vateekul ◽  
Upa Gupta ◽  
Teeranai Kormongkolkul ◽  
Arnon Jirakittayakorn ◽  
...  
Keyword(s):  
Association Rule ◽  
Association Rule Mining ◽  
Surface Current ◽  
Ocean Surface ◽  
Hf Radar ◽  
Rule Mining ◽  
Radar Observations ◽  
Ocean Surface Current

HF radar observations in the northern Adriatic: surface current field in front of the Venetian Lagoon

2004 ◽  
Vol 51 (1-4) ◽  
pp. 95-122 ◽  
Author(s):  
V. Kovačević ◽  
M. Gačić ◽  
I. Mancero Mosquera ◽  
A. Mazzoldi ◽  
S. Marinetti
Keyword(s):  
Surface Current ◽  
Hf Radar ◽  
Current Field ◽  
Northern Adriatic ◽  
Radar Observations ◽  
Venetian Lagoon

scholarly journals Radar observations of ionospheric irregularities at Syowa Station, Antarctica: a brief overview

1996 ◽  
Vol 14 (12) ◽  
pp. 1454-1461 ◽  
Author(s):  
T. Ogawa
Keyword(s):  
Antenna Arrays ◽  
Auroral Zone ◽  
Ionospheric Irregularities ◽  
Hf Radar ◽  
Small Scale ◽  
Syowa Station ◽  
Radar Observations ◽  
Ionospheric Physics ◽  
Phased Antenna Arrays ◽  
F Region

Abstract. We briefly overview the radar observations that have been made for 30 years at Syowa Station, Antarctica for studying small-scale electron-density irregularities in the southern high-latitude E- and F-region ionosphere. Some observational results (i.e., long-term variations of radio aurora, Doppler spectra with narrow spectral widths and low Doppler velocities, and simultaneous observations of radar and optical auroras) from VHF radars capable of detecting 1.3- to 3-m scale irregularities are presented. A new 50-MHz radar system equipped with phased-antenna arrays began operation in February 1995 to observe two-dimensional behaviours of E-region irregularities. An HF radar experiment also began in February 1995 to explore decameter-scale E- and F-region irregularities in the auroral zone and polar cap. These two radars will contribute to a better understanding of the ionospheric irregularities and ionospheric physics at southern high latitudes.

scholarly journals Gap Filling of the CALYPSO HF Radar Sea Surface Current Data through Past Measurements and Satellite Wind Observations

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Adam Gauci ◽  
Aldo Drago ◽  
John Abela
Keyword(s):  
Oil Spills ◽  
Surface Current ◽  
Radar Data ◽  
Current Data ◽  
Hf Radar ◽  
Sea Surface ◽  
Machine Learning Techniques ◽  
Learning Techniques ◽  
Spatial Coverage ◽  
Essential Components

High frequency (HF) radar installations are becoming essential components of operational real-time marine monitoring systems. The underlying technology is being further enhanced to fully exploit the potential of mapping sea surface currents and wave fields over wide areas with high spatial and temporal resolution, even in adverse meteo-marine conditions. Data applications are opening to many different sectors, reaching out beyond research and monitoring, targeting downstream services in support to key national and regional stakeholders. In the CALYPSO project, the HF radar system composed of CODAR SeaSonde stations installed in the Malta Channel is specifically serving to assist in the response against marine oil spills and to support search and rescue at sea. One key drawback concerns the sporadic inconsistency in the spatial coverage of radar data which is dictated by the sea state as well as by interference from unknown sources that may be competing with transmissions in the same frequency band. This work investigates the use of Machine Learning techniques to fill in missing data in a high resolution grid. Past radar data and wind vectors obtained from satellites are used to predict missing information and provide a more consistent dataset.

scholarly journals High resolution observations of spectral width features associatedwith ULF wave signatures in artificial HF radar backscatter

2004 ◽  
Vol 22 (1) ◽  
pp. 169-182 ◽  
Author(s):  
D. M. Wright ◽  
T. K. Yeoman ◽  
L. J. Baddeley ◽  
J. A. Davies ◽  
R. S. Dhillon ◽  
...  
Keyword(s):  
High Resolution ◽  
Plasma Source ◽  
Spectral Width ◽  
Hf Radar ◽  
Mhd Waves ◽  
Small Scale ◽  
Ulf Waves ◽  
Source Population ◽  
Radar Backscatter ◽  
Field Lines

Abstract. The EISCAT high power heating facility at Tromsø, northern Norway, has been utilised to generate artificial radar backscatter in the fields of view of the CUTLASS HF radars. It has been demonstrated that this technique offers a means of making very accurate and high resolution observations of naturally occurring ULF waves. During such experiments, the usually narrow radar spectral widths associated with artificial irregularities increase at times when small scale-sized (high m-number) ULF waves are observed. Possible mechanisms by which these particle-driven high-m waves may modify the observed spectral widths have been investigated. The results are found to be consistent with Pc1 (ion-cyclotron) wave activity, causing aliasing of the radar spectra, in agreement with previous modelling work. The observations also support recent suggestions that Pc1 waves may be modulated by the action of longer period ULF standing waves, which are simultaneously detected on the magnetospheric field lines. Drifting ring current protons with energies of ∼ 10keV are indicated as a common plasma source population for both wave types. Key words. Magnetospheric physics (MHD waves and instabilities) – Space plasma physics (wave-particle interactions) – Ionosphere (active experiments)

scholarly journals Investigating the turbulent dynamics of small-scale surface fires

2021 ◽  
Author(s):  
Ajinkya Desai ◽  
Scott Goodrick ◽  
Tirtha Banerjee
Keyword(s):  
Small Scale ◽  
Surface Fires ◽  
Scale Surface

scholarly journals Measurement-free implementations of small-scale surface codes for quantum-dot qubits

2018 ◽  
Vol 97 (1) ◽  
Author(s):  
H. Ekmel Ercan ◽  
Joydip Ghosh ◽  
Daniel Crow ◽  
Vickram N. Premakumar ◽  
Robert Joynt ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Small Scale ◽  
Scale Surface
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