On the accuracy of HF radar surface current measurements: Intercomparisons with ship‐based sensors

Chapman, R.D.; Shay, Lynn K.; Graber, Hans C.; Edson, James B.; Karachintsev, Andrey V.; Trump, C. L.; Ross, Duncan B.

doi:10.1029/97jc00049

Cited by 193 publications

(118 citation statements)

References 22 publications

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“…Only the radial component maps were taken into consideration, and not the current vectors that can be deduced by the geometric combination of the two sets of radar measurements. The first reason for this choice is to prevent the introduction of the geometric dilution of precision, which is inherent in the vector mapping process (Chapman et al, 1997). The second reason is to dispose of the most extended observation area and to avoid wasting valid observations.…”

Section: Observationsmentioning

confidence: 99%

Assimilation of HF radar surface currents to optimize forcing in the northwestern Mediterranean Sea

Marmain

Molcard

Forget

et al. 2014

Nonlin. Processes Geophys.

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Abstract. HF radar measurements are used to optimize surface wind forcing and baroclinic open boundary condition forcing in order to constrain model coastal surface currents. This method is applied to a northwestern Mediterranean (NWM) regional primitive equation model configuration. A new radar data set, provided by two radars deployed in the Toulon area (France), is used. To our knowledge, this is the first time that radar measurements of the NWM Sea are assimilated into a circulation model. Special attention has been paid to the improvement of the model coastal current in terms of speed and position. The data assimilation method uses an ensemble Kalman smoother to optimize forcing in order to improve the model trajectory. Twin experiments are initially performed to evaluate the method skills. Real measurements are then fed into the circulation model and significant improvements to the modeled surface currents, when compared to observations, are obtained.

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Section: Observationsmentioning

confidence: 99%

Assimilation of HF radar surface currents to optimize forcing in the northwestern Mediterranean Sea

Marmain

Molcard

Forget

et al. 2014

Nonlin. Processes Geophys.

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“…The normal component is poorly constrained near the baseline between two sites and the azimuthal component is poorly constrained far from the sites, yielding a Geometric Dilution Of Precision (GDOP [Chapman et al, 1997]). It can be estimated as follows [Gurgel, 1994;D.…”

Section: Appendix A: Vector Currents Estimationmentioning

confidence: 99%

Tidal currents in the northwestern Adriatic: High‐frequency radio observations and numerical model predictions

et al. 2007

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[1] A 2-year deployment of high-frequency radio current meters along the Italian coast of the northwestern Adriatic is used to characterize the surface tidal currents. In the middle of the basin, the M 2 and K 1 currents oscillate along the basin axis, but become more circular toward the Italian coast. Comparisons with a 3-D finite-element nonlinear numerical model of the tides show a good agreement for phases in the middle of the basin, although modeled currents amplitudes are overestimated. However, modeled phases lag observed phases by up to 50°(1.7 hours) for M 2 and 100°(6.7 hours) for K 1 , and modeled amplitudes are underestimated, in a 10-20 km wide strip along the Italian coast. This shallow (< 30 m deep) region is stratified by low-salinity surface water from the Po, and laterally sheared by the Western Adriatic Current, both absent from the model but possibly affecting tidal propagation. The model may also incompletely parameterize the combined effects of bottom friction and vertical mixing of momentum.

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“…Dilution Of Precision (GDOP, Chapman et al, 1997) is at the origin of systematic low reliability of velocity vectors at the edge of the observed domain, as well as along the baseline connecting receiving antennas. The accuracy of the total vector maps also depends on the number of radial velocities from each radar site involved in the combination process, known as Geometrical Dilution Of Statistical Accuracy (GDOSA, Barrick, 2002).…”

Section: Basic Principles Of Hfr Operation and Data Specificationsmentioning

confidence: 99%

HF Radar Activity in European Coastal Seas: Next Steps toward a Pan-European HF Radar Network

et al. 2017

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High Frequency Radar (HFR) is a land-based remote sensing instrument offering a unique insight to coastal ocean variability, by providing synoptic, high frequency and high resolution data at the ocean atmosphere interface. HFRs have become invaluable tools in the field of operational oceanography for measuring surface currents, waves and winds, with direct applications in different sectors and an unprecedented potential for the integrated management of the coastal zone. In Europe, the number of HFR networks has been showing a significant growth over the past 10 years, with over 50 HFRs currently deployed and a number in the planning stage. There is also a growing literature concerning the use of this technology in research and operational oceanography. A big effort is made in Europe toward a coordinated development of coastal HFR technology and its products within the framework of different European and international initiatives. One recent initiative has been to make an up-to-date inventory of the existing HFR operational systems in Europe, describing the characteristics of the systems, their operational products and applications. This paper offers a comprehensive review on the present status of European HFR network, and discusses the next steps toward the integration of HFR platforms as operational components of the European Ocean Observing System, designed to align and integrate Europe's ocean observing capacity for a truly integrated end-to-end observing system for the European coasts.

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On the accuracy of HF radar surface current measurements: Intercomparisons with ship‐based sensors

Cited by 193 publications

References 22 publications

Assimilation of HF radar surface currents to optimize forcing in the northwestern Mediterranean Sea

Assimilation of HF radar surface currents to optimize forcing in the northwestern Mediterranean Sea

Tidal currents in the northwestern Adriatic: High‐frequency radio observations and numerical model predictions

HF Radar Activity in European Coastal Seas: Next Steps toward a Pan-European HF Radar Network

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