Validating HF Radar Current Accuracy via Lagrangian Measurements and Radar-to-Radar Comparisons in Highly Variable Surface Currents

Remote Sensing, Journal Year: 2025, Volume and Issue: 17(7), P. 1243 - 1243

Published: March 31, 2025

The validation of HF radar systems remains an area with significant scope for advancement, particularly in terms linking data quality system operational parameters, fully utilizing the potential redundant (e.g., overlapping radial measurements), and accurately capturing spatiotemporal variability observed by independent devices, such as drifters. In this study, we conducted a large-scale Lagrangian measurement campaign Tuscan Archipelago, aimed at validating surface current from network. This network, recent addition to area, monitors oceanographic region critical Mediterranean dynamics. was executed using different approaches: Eulerian method, comparing velocities measured drifter-derived along directions; contrasting drifter trajectories synthetic virtual generated radar-based flow fields; radar-to-radar comparisons concurrent utilization two radars same point. Through fine-tuning control parameters analysis impact thresholds assessed radar’s ability capture dynamic processes, identifying both strengths limitations. Our results not only confirm utility coastal monitoring but also provide basis improving calibration strategies, ultimately supporting more accurate, high-resolution observations complex marine environments.

Language: Английский

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AI-driven 6-hour ahead nowcasting of sea-surface currents using HF Radar

Applied Ocean Research, Journal Year: 2025, Volume and Issue: 158, P. 104542 - 104542

Published: April 8, 2025

Language: Английский

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High frequency radar observing system simulation experiment in the Western Mediterranean Sea. A Lagrangian assessment approach

Ocean Modelling, Journal Year: 2025, Volume and Issue: unknown, P. 102553 - 102553

Published: April 1, 2025

Language: Английский

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High-Frequency Radar observation of strong and sheared currents: the Alderney race paradigm

Ocean Dynamics, Journal Year: 2025, Volume and Issue: 75(6)

Published: May 13, 2025

Abstract The Alderney Race has been identified as a future site for the development of tidal energy, due to its bidirectional strong current reaching 5 m/s during spring tides. High-frequency coastal radars can provide synoptic and near-real-time view such complex circulation, but classical processing algorithms are not adapted extreme situation strongly sheared currents. We propose an improved high-resolution direction-finding technique azimuthal radar data. It uses phased-array systems combines advantages usual beam-forming eliminate many problems related distortion Doppler spectra by method is evaluated with unique data set measurements at two frequencies (13 24.5 MHz) three spatial resolutions (200, 750, 1500 m). radar-based surface currents analyzed in light numerical model also compared situ measurements. While high resolution be achieved this way, it shown that typical range 750 m insufficient account variations some specific times locations.

Language: Английский

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Observations in the Spanish Mediterranean Waters: A Review and Update of Results of 30-Year Monitoring

Journal of Marine Science and Engineering, Journal Year: 2023, Volume and Issue: 11(7), P. 1284 - 1284

Published: June 24, 2023

The Instituto Español de Oceanografía (IEO, Spanish Institute of Oceanography) has maintained different monitoring programs in the Mediterranean waters (Western Mediterranean) since 1992. All these were unified 2007 under current program RADMED (series temporales datos oceanográficos en el Mediterráneo), which is devoted to situ multidisciplinary sampling water column coastal and open-sea by means periodic oceanographic campaigns. These campaigns, together with a network tide-gauges, are part IEO Observing system (IEOOS). In some cases, temperature salinity time series collected frame now more than 30 years long, whereas sea level date beginning 1940s. This information been complemented international databases analyzed numerous works Grupo mediterráneo Cambio Climático (GCC; Climate Change Group) for 20 years. have detection quantification changes that climate change producing on physical, chemical, biological properties waters. this work, we review results obtained GCC 2005 relation physical sea: temperature, salinity, density, heat content, mixed layer depth, level. Time updated from last works, reliability existing climatologies long-term trends analyzed. Furthermore, sources uncertainty estimation linear considered present work. Besides update data IEOOS, conduct capabilities other institutions dealing such institutions. particular, include SOCIB (Servicio Observación y Predicción Costero las Islas Baleares; Balearic Islands costal observing forecasting system) study marine waves warming surface, corresponding intense Catalan continental shelf at L’Estartit station. evidence surface up rate higher affecting global ocean (>2 °C/100 years). increase also observed along whole column. Marine increasing their intensity, frequency, duration 1982, 2.5 mm/yr. seems compensated warming, least intermediate where no significant detected density. could be reason lack evolution depth. highlight importance necessity maintaining programs, essential occurring throughout

Language: Английский

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An ocean practices maturity model: from good to best practices

Frontiers in Marine Science, Journal Year: 2024, Volume and Issue: 11

Published: Aug. 20, 2024

Ocean practices, intended as a wide spectrum of methodologies supporting ocean-related research, operations, and applications, are constantly developed improved to enable informed decision-making. Practices start from the idea an individual or group often evolve towards what can be called good best practices. This bottom-up approach may in principle result different paths for evolution each practice, ultimately generate situations where it is not clear new user how compare two practices aiming at same objective, determine which one best. Also, although practice supposed multi-institutional collaborative effort based on principles evidence, repeatability comparability, set requirements yet defined literature considered good, better, practice. paper proposes method addressing those questions presents maturity model ocean built upon existing models systems software, adopted last decades. The provides attributes assessing both description its implementation. It also framework analyzing gaps suggesting actions evolution. has been tested against series widely results reported discussed. work facilitates common developing greater interoperability trust achieved.

Language: Английский

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4D-Var data assimilation and observation impact on surface transport of HF-Radar derived surface currents in the North-Western Mediterranean Sea

Ocean Modelling, Journal Year: 2023, Volume and Issue: 184, P. 102236 - 102236

Published: June 28, 2023

Language: Английский

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Gulf of Naples Advanced Model (GNAM): A Multiannual Comparison with Coastal HF Radar Data and Hydrological Measurements in a Coastal Tyrrhenian Basin

Journal of Marine Science and Engineering, Journal Year: 2022, Volume and Issue: 10(8), P. 1044 - 1044

Published: July 29, 2022

High-resolution modelling systems have increasingly become an essential requirement to investigate ocean dynamics over a wide range of spatial and temporal scales, integrate the punctual observations. When applied in coastal areas, they also potential provide detailed representation transport exchange processes at sub-basin scale. This paper presents validation exercise between surface fields generated by regional modeling system (ROMS), developed for Tyrrhenian Sea downscaled Gulf Naples (GNAM advanced model), 4 year-long (2009–2012) record high-frequency radar (HFR) data. The comparison hourly seasonal model results HFR is focused on (GoN), where observational network three sites has been operational since 2004, specific subdomain characterized presence Sarno river, long-term ecological research station (LTER-MC) one important canyon area. An evaluation transect delimiting inshore–offshore zones GoN presented. GNAM was compared with situ hydrological parameters temperatures salinities retrieved LTER-MC fixed monitoring station. According skill metrics, basic circulation features are accurately reproduced model, despite some drawbacks terms increment energy content current field occurring during events. allow us identify errors suggest useful improvements, outcome confirms unique capability HF fine-scale measurements numerical models counterbalance lack high-resolution areas.

Language: Английский

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Using a Combination of High-Frequency Coastal Radar Dataset and Satellite Imagery to Study the Patterns Involved in the Coastal Countercurrent Events in the Gulf of Cadiz

Remote Sensing, Journal Year: 2024, Volume and Issue: 16(4), P. 687 - 687

Published: Feb. 15, 2024

This study exploits the combination of High-Frequency Coastal Radar (HFR) information with satellite-derived observations to characterize patterns involved in coastal countercurrents (CCCs) events Gulf Cadiz (GoC), which is situated SW Iberian Peninsula. The westward alongshore currents are observed throughout year, but main drivers necessary develop this flow and its extension both parts basin not fully clear. In order identify physical processes (both local remote) that induce development these evaluate connection circulation between eastern western part GoC, we make use several data sources available for region. First all, a land-based system HFR antennas located at four different sites GoC provides velocity field surface basin. To achieve significant characterization CCCs Gulf, dataset analyzed processed by means series operations, including Empirical Orthogonal Functions (EOFs) analysis used spatial temporal variability flow, low-pass filter isolate sub-inertial signal current interpolation fill missing values. Secondly, given known importance zonal component winds combined variations mean pressure sea level over Western Mediterranean during events, time meteorological correlated via statistical analysis. Finally, temperature fields chlorophyll-a distribution as tracers obtain on where cases studied year 2017. conducted revealed consistent occurrence driven most intense wind atmospheric fluctuations Sea. During those reached Portuguese side facilitated advection biological material warmer waters.

Language: Английский

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Assessment of OMA Gap-Filling Performances for Multiple and Single Coastal HF Radar Systems: Validation with Drifter Data in the Ligurian Sea

Remote Sensing, Journal Year: 2024, Volume and Issue: 16(13), P. 2458 - 2458

Published: July 4, 2024

High-frequency radars (HFRs) provide remote information on ocean surface velocity in extended coastal areas at high resolutions space (O(km)) and time (O(h)). They directly produce radial velocities (in the radar antenna’s direction) combined to total vector covered by least two radars. HFRs are a key element observing systems, with several important environmental applications. Here, we an assessment of HFR-TirLig network NW Mediterranean Sea, including results from gap-filling open-boundary modal analysis (OMA) using situ data drifters. While consists three radars, only were active during experiment, so test also includes area where one system available. The results, metrics, both Eulerian Lagrangian, configurations, show that performance is very satisfactory compares well previous literature terms coverage adequate, i.e., sampled Regarding OMA not do they perform equally but only. Even though obviously deteriorated respect case adequate coverage, can still regarding structure speed as virtual trajectories, which be some use practical A general discussion implications for potential sensing estimation HFR configurations complementing provided.

Language: Английский

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