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

Robinson, Alice M.; Wyatt, L.R.; Howarth, M.J.

doi:10.1080/1755876x.2011.11020121

Cited by 25 publications

(23 citation statements)

References 21 publications

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“…The disparity of uncertainty levels between the east and north component vectors comes for the geometry of the radar vector combination and the prevalent south-southwestward current flow. This presumably might lead to less (more) precise radial vectors provided by the ALFA (SALO) radar site since radial measurements have proven to be more accurate when the dominant current flow moves in the same direction (Robinson et al, 2011). Since the ALFA (SALO) site contributed mainly to the HF radar zonal (meridional) current assessment in the nearby B1 region, a strong relationship between radial and total vector uncertainties has been shown.…”

Section: Buoy-radar Comparison Resultsmentioning

confidence: 99%

Evaluating the surface circulation in the Ebro delta (northeastern Spain) with quality-controlled high-frequency radar measurements

Lorente¹,

Piedracoba²,

Soto‐Navarro³

et al. 2015

Ocean Sci.

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Abstract. The Ebro River delta is a relevant marine protected area in the western Mediterranean. In order to promote the conservation of its ecosystem and support operational decision making in this sensitive area, a three-site standard-range (13.5 MHz) CODAR SeaSonde high-frequency (HF) radar was deployed in December 2013. The main goal of this work is to explore basic features of the sea surface circulation in the Ebro deltaic region as derived from reliable HF radar surface current measurements. For this aim, a combined quality control methodology was applied: firstly, 1-year long (2014) real-time web monitoring of nonvelocity-based diagnostic parameters was conducted to infer both radar site status and HF radar system performance. The signal-to-noise ratio at the monopole exhibited a consistent monthly evolution, although some abrupt decreases (below 10 dB), occasionally detected in June for one of the radar sites, impacted negatively on the spatiotemporal coverage of total current vectors. It seemed to be sporadic episodes since radar site overall performance was found to be robust during 2014. Secondly, a validation of HF radar data with independent in situ observations from a moored current meter was attempted for May-October 2014. The accuracy assessment of radial and total vectors revealed a consistently high agreement. The directional accuracy of the HF radar was rated at better than 8 • . The correlation coefficient and root mean square error (RMSE) values emerged in the ranges [0.58-0.83] and [4.02-18.31] cm s −1 , respectively. The analysis of the monthly averaged current maps for 2014 showed that the HF radar properly represented basic oceanographic features previously reported, namely, the predominant southwestward flow, the coastal clockwise eddy confined south of the Ebro delta mouth, or the Ebro River impulsive-type freshwater discharge. The EOF analysis related the flow response to local wind forcing and confirmed that the surface current field evolved in space and time according to three significantly dominant modes of variability.

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Section: Buoy-radar Comparison Resultsmentioning

confidence: 99%

Evaluating the surface circulation in the Ebro delta (northeastern Spain) with quality-controlled high-frequency radar measurements

Lorente¹,

Piedracoba²,

Soto‐Navarro³

et al. 2015

Ocean Sci.

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“…This has been shown to be a reasonable bound for good data quality data (Shay et al [12]; Cook and Shay [27]; Robinson et al [10]) and is the value used in this paper. Annual averages of velocity magnitude show weak currents (< 0.1 m·s -1 ) and dominant onshore flow for the CBG region ( Fig.…”

Section: Assessment Of Hf Phased-array Radar Currentsmentioning

confidence: 99%

“…Like many other such studies, only short (1-3 month) data sets were available allowing ad-hoc methods to be used to de-spike and interpolate data for subsequent spectral analysis. Robinson et al [10] summarise a number of these validations as well as the results of their much longer (2 year) time series comparison. A simple automated de-spiking procedure was applied and least squares fitting used to obtain tidal coefficients thus avoiding the need to fill gaps.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Surface Currents Measured With High-Frequency Phased-Array Radars in Two Regions of Complex Circulation

Wyatt

Mantovanelli

Heron

et al. 2018

IEEE J. Oceanic Eng.

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“…These systems are now widely accepted by the oceanographic community as an efficient tool and are routinely used by many U.S. and European oceanographic research organizations (see for example the Southern California Coastal Ocean Observing System at www.sccoos.org). The performance of HF radars has been extensively tested by comparisons with moored ADCPs, ship mounted ADCPs, drifters and models (e.g., Carbajal and Pohlmann 2004;Chapman et al 1997;Kaplan et al 2005;Kohut and Glenn 2003;Kokkini et al 2014;Ohlmann et al 2007;Shay et al 2008;Parks et al 2009;Robinson and Wyatt 2011). For example, comparisons of ADCP and WERA (Wellen Radars) estimates of surface currents at the observation network in the German Bight showed that the standard deviation between the two estimates was less than 0.1 ms -1 and the bias was -0.004 ms -1 .…”

Section: Data Sets and Methodsmentioning

confidence: 99%

Surface currents in the Porsanger fjord in northern Norway

Stramska¹,

Jankowski²,

Cieszyńska³

2016

Polish Polar Research

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Abstract:We describe surface currents in the Porsanger fjord (Porsangerfjorden) located in the European Arctic in the vicinity of the Barents Sea. Our analysis is based on surface current data collected in the summer of 2014 using High Frequency (WERA, Helzel Messtechnik GmbH) radar system. One of our objectives was to separate out the tidal from the nontidal components of the currents and to determine the most important tidal constituents. Tides in the Porsanger fjord are substantial, with tidal range on the order of about 3 m. Tidal analysis attributes to tides about 99% of variance in sea level time series recorded in Honningsvaag. The most important tidal component in sea level data is the M2 component, with amplitude of ~90 cm. The S2 and N2 constituents (amplitude of ~20 cm) also play a significant role in the semidiurnal sea level oscillations. The most important diurnal component is K1 with amplitude of about 8 cm. The most important tidal component in analyzed surface currents records is the M2 component. The second most important component is the S2. Our results indicate that in contrast to sea level, only about 10-30% of variance in surface currents can be attributed to tidal currents. This means that about 70-90% of variance is due to wind-induced and geostrophic currents.

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

Cited by 25 publications

References 21 publications

Evaluating the surface circulation in the Ebro delta (northeastern Spain) with quality-controlled high-frequency radar measurements

Evaluating the surface circulation in the Ebro delta (northeastern Spain) with quality-controlled high-frequency radar measurements

Assessment of Surface Currents Measured With High-Frequency Phased-Array Radars in Two Regions of Complex Circulation

Surface currents in the Porsanger fjord in northern Norway

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