Evaluating Radial Current Measurements from CODAR High-Frequency Radars with Moored Current Meters*

Emery, Brian; Washburn, Libe; Harlan, Jack

doi:10.1175/1520-0426(2004)021<1259:ercmfc>2.0.co;2

Cited by 146 publications

(119 citation statements)

References 36 publications

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“…Mean current speeds in cm/s, where the absolute value of the current velocity is averaged, is also listed A, 0.87 ± 0.004, and ADCP B, 0.82 ± 0.005, at the 99% confidence limit are lower than for Formby but the results still exceed those found in previous investigations (see Table 1). Previous HF radar and ADCP correlations, including Fernandez and Paduan, 12 using a 25MHz OSCR radar, and those of Emery 16 and Paduan, 28 both of whom used a 13MHz CODAR radar, had correlations ranging between 0.5 and 0.72. Previous studies have, however, used ADCP data from 9m and 20m below the ocean surface which is below the measurement averaging depth of the HF radars.…”

Section: Radial Resultsmentioning

confidence: 97%

“…27 In Liverpool Bay this is 7.6°. Emery 16 calculated the bearing accuracy of the CODAR radar to be in the region of 4-10°and any angular agreement between the radar and ADCP of this order is acceptable. At 13MHz the current is depth averaged to approximately 1m, 17 temporally averaged over 8 min, 52 sec every 20 min and recorded on a 4km rectangular grid up to a 75km range.…”

Section: Hf Radarmentioning

confidence: 99%

“…16 Radial-ADCP current comparisons are highly dependent on the physical situation of the radar and current orientation in relation to the radar measurement. Paduan 28 found increased correlations when a high percentage of current was in the direction of the radar radial measurement, as was the case for the Santa Cruz (SC) and Point Pinos (PP), compared to when it was not, as was the case for Moss Landing (ML) (see Table 1).…”

Section: Hf Radar/adcp Comparisonsmentioning

confidence: 99%

“…11 There have been several studies on the current measurement agreement between HF radars and ADCPs as well as other fixed moorings such as current meters and buoys. 2,12,13,14,15,16 These have provided better understanding of the physical processes involved, allowed ongoing performance assessment and motivated improvements in measurement capabilities. They involve the comparison of radar surface current measurements with near surface current (exact depth depending on the particular instruments and deployment) obtained from the in-situ measurement device.…”

Section: Introductionmentioning

confidence: 99%

“…These studies share similar characteristics with Liverpool Bay and/or the HF WERA radar utilised by NOC, as well as comparing a mixture of current radials, dual east (u) and west (v) current components, and dual current vectors. Types of radar and fixed mooring vary and include the Ocean Surface Current Radar (OSCR), 12,13 the Coastal Ocean Dynamics Applications Radars (CODAR), 12,15,16 and the WEllan RAdar (WERA radar). 2 In spite of all these studies there remains some scepticism about the accuracy of HF radar current measurements and it is hoped this two-year comparison will provide further solid evidence to confirm the place of HF radar as an operational current measurement technology.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

A two year comparison between HF radar and ADCP current measurements in Liverpool Bay

Robinson

Wyatt

Howarth

2011

Journal of Operational Oceanography

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Section: Radial Resultsmentioning

confidence: 97%

Section: Hf Radarmentioning

confidence: 99%

Section: Hf Radar/adcp Comparisonsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A two year comparison between HF radar and ADCP current measurements in Liverpool Bay

Robinson

Wyatt

Howarth

2011

Journal of Operational Oceanography

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Surface circulation in the Gulf of Trieste (northern Adriatic Sea) from radar, model, and ADCP comparisons

Cosoli

Ličer

Vodopivec

et al. 2013

J. Geophys. Res. Oceans

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[1] High resolution high frequency (HF) radar observations of surface currents in the Gulf of Trieste (GoT) are presented and compared to moored subsurface current measurements and to high-resolution simulations from the Northern Adriatic Princeton Ocean Model (NAPOM) oceanographic model. Dominant circulation modes of the GoT were resolved and numerical model capabilities in reconstructing them were assessed. The time frame covers March 2011 through October 2012. NAPOM reconstructs the dominant surface circulation features observed by the radar, such as the general basin-wide cyclonic circulation scheme and the coastal jet outflowing the GoT, but is in general less energetic than radar currents. Comparisons between radar, ADCP, and model currents suggest that the model underestimates originate within the low-frequency, diurnal, semidiurnal, and inertial bands, and that both radar and model currents do not reproduce the diurnal tidal ellipse structure observed by the moored current meter. However, radar-model results for the semidiurnal tides are spatially consistent. Using empirical orthogonal function (EOF) decomposition, the coherent spatial scales and corresponding temporal scales were extracted. Findings suggest that HF radar current observations complement model simulations in regions of enhanced topographic variability where variance of model currents at the surface is distorted by the effects of the sigma layer grid. On the contrary, model results complement radar observations in areas with poor radar coverage, and furthermore provide spatial and temporal continuity of ocean state forecasts.

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Surface circulation at the Strait of Gibraltar: A combined HF radar and high resolution model study

Soto‐Navarro¹,

Lorente²,

Fanjul³

et al. 2016

JGR Oceans

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Observations from a high frequency radar system and outputs from a high resolution operational ocean model working at the Strait of Gibraltar have been analyzed and compared during the period February 2013 to September 2014 in order to evaluate their capability to resolve the surface circulation of the region. The description of the mean circulation patterns has been statistically assessed, showing good agreement, particularly in the central region of the strait corresponding with the Atlantic Jet (AJ) stream, although some short scale features are not reproduced by the model. In the frequency domain very high concordance is observed. Tidal maps of diurnal and semidiurnal constituents are in good agreement with previous observations. The analysis of the model and radar response to the wind forcing reveals that the low resolution of the model wind‐forcing field and its deeper superficial level smoothes the wind effect on the simulated currents. The first three EOF modes account for the 86% of model and radar variances. The coincidence between the observed and simulated patterns is very significant for the first two modes, which account for the mean velocity field and the latitudinal shifting of the AJ consequence of the flow‐topography interaction. The third mode captures the wind‐induced circulation, and greater discrepancies are found in this case. Results underline the complementary character of both systems: radar observations improve the model description, resolving short scale processes, while the model completes the radar information when the time or spatial coverage is poorer.

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Evaluating Radial Current Measurements from CODAR High-Frequency Radars with Moored Current Meters*

Cited by 146 publications

References 36 publications

A two year comparison between HF radar and ADCP current measurements in Liverpool Bay

A two year comparison between HF radar and ADCP current measurements in Liverpool Bay

Surface circulation in the Gulf of Trieste (northern Adriatic Sea) from radar, model, and ADCP comparisons

Surface circulation at the Strait of Gibraltar: A combined HF radar and high resolution model study

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