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Title: Skill Assessment of HF Radar-Derived Products for Lagrangian Simulations in the Bay of Biscay
Authors: Solabarrieta, Lohitzune; Frolov, Sergey; Cook, Mike; Paduan, Jeff; Rubio, Anna; Gonzalez, Manuel; Mader, Julien; Charria, Guillaume
Citation: JOURNAL OF ATMOSPHERIC AND OCEANIC TECHNOLOGY, 2016, 33, 2585-2597
Abstract: Since January 2009, two long-range high-frequency (HF) radar systems have been collecting hourly high-spatial-resolution surface current data in the southeastern corner of the Bay of Biscay. The temporal resolution of the HF radar surface currents permits simulating drifter trajectories with the same time step as that of real drifters deployed in the region in 2009. The main goal of this work is to compare real drifter trajectories with trajectories computed from HF radar currents obtained using different methods, including forecast currents. Open-boundary modal analysis (OMA) is applied to the radar radial velocities and then a linear autoregressive model on the empirical orthogonal function (EOF) decomposition of an historical data series is used to forecast OMA currents. Additionally, the accuracy of the forecast method in terms of the spatial and temporal distribution of the Lagrangian distances between observations and forecasts is investigated for a 4-yr period (2009-12). The skills of the different HF radar products are evaluated within a 48-h window. The mean distances between real trajectories and their radar-derived counterparts range from 4 to 5 km for real-time and forecast currents after 12 hours of simulations. The forecast model improves persistence (i.e., the simulations obtained by using the last available OMA fields as a constant variable) after 6 hours of simulation and improves the estimation of trajectories up to 28\% after 48 hours. The performance of the forecast is observed to be variable in space and time, related to the different ocean processes governing the local ocean circulation.
Keywords: HIGH-FREQUENCY RADAR; WATER CIRCULATION PATTERNS; SURFACE CURRENTS; SOUTHEASTERN BAY; SOUTHERN BAY; SEA; SLOPE; VARIABILITY; EXTRACTION; DYNAMICS
Issue Date: 2016
Publisher: AMER METEOROLOGICAL SOC
Type: Article
Language: English
DOI: 10.1175/JTECH-D-16-0045.1
URI: http://dspace.azti.es/handle/24689/109
ISSN: 0739-0572
E-ISSN: 1520-0426
Funder: Fundacion Centros Tecnologicos Inaki Goenaga
JERICO\_NEXT project
European Commission's Horizon Programme \[65 4410]
Appears in Publication types:Artículos científicos



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