Probabilistic relationships between wind and surface water circulation patterns in the SE Bay of Biscay

Solabarrieta, Lohitzune; Rubio, Anna; Cárdenas, Mar; Castanedo, Sonia; Esnaola, Ganix; Méndez, Fernando J.; Medina, Raúl; Ferrer, Luis Gabriel

doi:10.1007/s10236-015-0871-5

Cited by 32 publications

(62 citation statements)

References 37 publications

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“…) than those observed in winter (Solabarrieta et al 2014). Because of the stronger stratification of the water column, the vertical gradients of the horizontal currents in summer show a higher vertical shear than in winter (Rubio et al 2013a).…”

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confidence: 83%

“…In winter, the IPC flows eastward along the Spanish coast and northward along the French coast, affecting the upper water column from the surface to 300-m depth (Le Cann and Serpette 2009) and is associated with warm surface waters along the northern Spanish slope (Pingree and Le Cann 1990). From the joint analysis of ADCP, HF radar, and North Atlantic Oscillation (NAO) index databases, eastward (northward) surface currents of 70 cm s 21 were observed along the Spanish (French) slope, related to the winter IPC (Solabarrieta et al 2014). In summer, the circulation over the slope is reversed; that is, it presents a westward (southward) flow over the Spanish (French) slope, with intensities 3 times weaker (;10-20 cm s…”

Section: Introductionmentioning

confidence: 99%

“…The analysis of low-pass-filtered currents shows that a key component of this variability is associated with the surface signature of the slope current [Iberian Poleward Current (IPC)], which is more intense over the upper part of the slope (Solabarrieta et al 2014). In winter, the IPC flows eastward along the Spanish coast and northward along the French coast, affecting the upper water column from the surface to 300-m depth (Le Cann and Serpette 2009) and is associated with warm surface waters along the northern Spanish slope (Pingree and Le Cann 1990).…”

Section: Introductionmentioning

confidence: 99%

“…Overlaid to the density-driven slope circulation, windinduced currents are the main drivers of the surface ocean circulation in the HF radar footprint area and are observed in a wide range of time scales, from seasonal to high frequency Fontán and Cornuelle 2015;Solabarrieta et al 2015;Kersalé et al 2016). During autumn and winter, southwestern winds dominate and generate northward and eastward drift over the shelf.…”

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confidence: 99%

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Skill Assessment of HF Radar–Derived Products for Lagrangian Simulations in the Bay of Biscay

Solabarrieta

Фролов

Cook

et al. 2016

Journal of Atmospheric and Oceanic Technology

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Since January 2009, two long-range high-frequency (HF) radar systems have been collecting hourly highspatial-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 . 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.

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confidence: 83%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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confidence: 99%

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Skill Assessment of HF Radar–Derived Products for Lagrangian Simulations in the Bay of Biscay

Solabarrieta

Фролов

Cook

et al. 2016

Journal of Atmospheric and Oceanic Technology

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“…Figure 7 provides an example for such succession of PC values in the context of storm floods. In relating winds and surface circulation patterns, Solabarrieta et al (2015) replaced PCA by more advanced neural network methods and clustering algorithms. If, however, the objective is to provide generic time series that can easily be used within the context of any further analysis, then the simple and transparent interpretation of PCs and corresponding EOFs is an advantage that should not be discarded.…”

Section: Discussionmentioning

confidence: 99%

German Bight residual current variability on a daily basis: principal components of multi-decadal barotropic simulations

et al. 2016

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Poleward along-shore current pulses on the inner shelf of the Bay of Biscay

Kersalé

Marié

Cann

et al. 2016

Estuarine, Coastal and Shelf Science

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We analyzed strong events of coastal poleward along-shore currents above 10 cm s−1 and up to more than 50 cm s−1 on the inner shelf (50-80 m depth) of the Bay of Biscay (BoB) from the Spanish coast to the Brittany coast. We used data from four acoustic Doppler current profilers (ADCPs) deployed from July 2009 to August 2011. The goal of this study was to analyze current variability at meso-and subinertial scales and their generation mechanisms. These currents occurred all year long and were classified into three types. Events occurring principally in the southern part of the BoB were classified as southern events. Bay-scale events were defined when strong poleward currents were detected over all the shelf, typically stronger on the Spanish and the southern Brittany shelves. Strong events were characterized by depth averaged current velocities over 40 cm s−1 in the southern part of the BoB. At short time lags, the along-shore currents were clearly related to along-shore wind stress at upstream locations. An explanation is provided for longer time lags in terms of coastal trapped wave (CTW) dynamics. The first CTW mode phase speeds were in agreement with the propagation speeds of the fastest events (> 5 m s−1), while inner shelf modes could explain the slowest events (∼ 1-3 m s−1). The cross-shelf density gradient and the extension of the IPC were also associated with strong coastal poleward along-shore currents. The duration of the events, the vertical structure of the currents and the associated coastal trapped waves were studied in relation with the stratification.

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Probabilistic relationships between wind and surface water circulation patterns in the SE Bay of Biscay

Cited by 32 publications

References 37 publications

Skill Assessment of HF Radar–Derived Products for Lagrangian Simulations in the Bay of Biscay

Skill Assessment of HF Radar–Derived Products for Lagrangian Simulations in the Bay of Biscay

German Bight residual current variability on a daily basis: principal components of multi-decadal barotropic simulations

Poleward along-shore current pulses on the inner shelf of the Bay of Biscay

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