A 3‐D data‐assimilative tidal model of the northwest Atlantic

Paturi, Shastri; Young, Brad de; Yi, Yuchan; Shum, C. K.

doi:10.3137/oc303.2010

Cited by 14 publications

(9 citation statements)

References 22 publications

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“…A southeastward flow dominates the centre of the bay with a maximum of approximately 6 cm s −1 over the outer shelf banks. The general surface current features in the present model are consistent with previous model results (Han, 2000;Han et al, 2010). The relative absolute error of the modelled M 2 current is 41% and 33% for eastward and northward components, respectively.…”

Section: Modelling Temperature Currents and Stratification In Placensupporting

confidence: 80%

“…The M 2 tide propagates from the Avalon Channel westward through the model domain and northward toward the head of the bay, with a maximum amplitude of 70 cm. The S 2 and N 2 constituents (not shown) have similar spatial patterns but with amplitudes four to five times smaller, which is consistent with other studies of the semi-diurnal tidal constituents along the inner Newfoundland Shelf (Han, 2000;Han et al, 2010). The K 1 diurnal constituent is much smaller than the M 2 tide.…”

Section: Model Validation a Comparison Of Observed And Calculated Tidsupporting

confidence: 78%

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Modelling Temperature, Currents and Stratification in Placentia Bay

deYoung

2012

Atmosphere-Ocean

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Placentia Bay is an important spawning and nursery ground for Atlantic Cod (Gadus morhua) and a vital shipping corridor for Newfoundland industry, but our ability to forecast the bay circulation is limited. In this study, a three-dimensional (3-D) circulation model based on a finite-volume coastal ocean model (FVCOM) was developed in 1999 to simulate temperature, currents and stratification. The model is forced at the lateral open boundaries with five leading tidal constituents and non-tidal sea surface elevation and at the surface with wind and heat flux. The open boundary temperature, salinity and non-tidal sea levels are derived from a larger-scale shelf model. Simulated tides agree well with tide-gauge data, with a root sum square (RSS) error of 4.6 cm for the elevations of the five tidal constituents and a relative root mean square (RMS) error of 37% for M 2 tidal currents. The modelled temperature has RMS errors of 1°-2°C. The non-tidal currents show reasonable agreement with moored measurements. The model realistically simulates many features of the bay that may affect early life stages of fish, including the evolution of stratification from spring to fall, the cyclonic circulation in the outer bay and late-spring upwelling on the western side of the outer bay.RÉSUMÉ [Traduit par la rédaction] La baie Placentia est une frayère et une aire de croissance importantes pour la morue (Gadus morhua) ainsi qu'une voie de circulation vitale pour l'industrie à Terre-Neuve, mais notre capacité à prévoir la circulation dans la baie est limitée. Dans notre étude, nous avons élaboré un modèle de circulation en trois dimensions en nous fondant sur un modèle d'océanologie côtière à volumes finis (FVCOM) afin de simuler la température, les courants et la stratification en 1999. Le modèle est forcé aux limites ouvertes latérales avec cinq grandes composantes de la marée et l'élévation de la surface libre de la mer non soumise aux marées et à la surface avec le vent et le flux thermique. La température aux limites ouvertes, la salinité et les niveaux de la mer non soumis aux marées ont été établis à partir d'un modèle du plateau continental à grande échelle. Les simulations de marée concordent bien avec les données recueillies à l'aide de marégraphes, avec une erreur quadratique moyenne (RSS) de 4,6 cm pour les élévations des cinq composantes de la marée et une erreur quadratique moyenne relative (RMS) de 37% pour les courants de marée M 2 . La température obtenue à l'aide du modèle présente des erreurs RMS de 1°à 2°C. Les courants sans marée concordent raisonnablement bien avec les mesures obtenues au moyen d'instruments amarrés. Le modèle simule de façon réaliste beaucoup de caractéristiques de la baie qui se répercutent sans doute sur les premiers stades de la vie du poisson, notamment l'évolution de la stratification du printemps à l'automne, la circulation cyclonique dans l'avant-baie et la remontée d'eau froide à la fin du printemps sur la rive ouest de l'avant-baie.

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Section: Modelling Temperature Currents and Stratification In Placensupporting

confidence: 80%

Section: Model Validation a Comparison Of Observed And Calculated Tidsupporting

confidence: 78%

Modelling Temperature, Currents and Stratification in Placentia Bay

deYoung

2012

Atmosphere-Ocean

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“…Over the Grand Banks, the speed is about 20 cm s It is worth noting that tidal current is not included in the model simulation. According to model studies (Petrie, 1987;Han, 2000;Han et al, 2010), the magnitude of the tidal current is about 8 cm s −1 in the interior of the Grand Banks and 20 cm s −1 near the southeastern shelf edge of the Newfoundland shelf and St. Pierre Bank. Such magnitudes have a small impact on the distribution of extreme current speeds in the surface layer, which has a maximum magnitude of over 140 cm s −1 .…”

Section: Extreme Current Speedsmentioning

confidence: 99%

Modelling Extreme Storm-Induced Currents over the Grand Banks

Tang

Prescott³

2011

Atmosphere-Ocean

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Extreme storm-induced currents over the Grand Banks are investigated using a three-dimensional (3-D) ocean circulation model forced by 22 storms selected from the past 50 years with return intervals ranging from 1 to 34 years. Wind data for the storms are historical atmospheric data. The modelled currents are compared with current meter measurements made during a storm in March 1983. The results indicate good agreement between the model and measurements. In the surface layer of the Grand Banks, the model extreme current speeds are approximately 80 cm s −1 over a large portion of the Grand Banks, and some areas have extreme current speeds higher than 120 cm s −1 . The highest extreme current speeds occur at St. Pierre Bank, where the speed reaches 140 cm s −1 . In the bottom layer, the region with high extreme current speeds is mainly in the periphery of the Grand Banks, with magnitudes over 40 cm s −1 . The results also show that the response of the water to storm forcing in the Grand Banks area varies from place to place because the mechanisms of current generation are different at different locations. . Dans la couche de fond, la région de grandes vitesses de courants extrêmes se situe principalement à la périphérie des Grands Bancs, avec des valeurs d'environ 40 cm s −1 . Les résultats montrent aussi que la réponse de l'eau au forçage par les tempêtes dans la région des Grands Bancs varie d'un endroit à l'autre parce que les mécanismes de production de courant sont différents pour des endroits différents.

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“…This also highlights the inability of the current ocean tide models to accurately predict ocean tides over shallow water regions where complicated local hydrodynamic effects dominate. Nonetheless, the competitive accuracy of the newly developed pure empirical altimetry tide model (OSU06) along the coasts suggests that regional hydrodynamic tide models that assimilate altimetric tides may significantly improve ocean tides over these shallow regions, as already demonstrated in the Northwest Atlantic region [Han et al, 2010]. Table 3b.…”

Section: Discussionmentioning

confidence: 90%

“…Examples include, but are not limited to, operational ocean [Han et al, 2010] and climate forecast [Escudier & Fellous, 2009], co-tidal chart generation for mariners [Fang et al, 2004], study of regional tidal dynamics and dissipation [Han, 2000;Zu et al, 2008], and regional dynamics of the solid Earth through GPS and gravimeter data in which ocean loading tide derived from the major tidal constituents are a substantial correction component [Inazu et al, 2009;Yuan et al, 2009]. Most of the abovementioned applications rely heavily on the global ocean tide model as initial boundary conditions for regional studies.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Ocean Tide Models Used for Jason-2 Altimetry Corrections

et al. 2010

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It has been over a decade since the last comprehensive accuracy assessment of global ocean tide models. Here, we conduct an evaluation of the barotropic ocean tide corrections, which were computed using FES2004 and GOT00.2, and other models, on the Jason-2 altimetry Geophysical Data Record (GDR), with a focus on selected coastal regions with energetic ocean dynamics. We compared 9 historical and contemporary ocean tide models with pelagic tidal constants, and with multiple satellite altimetry mission (T/P, ERS-1/-2, Envisat, GFO, Jason-1/-2) sea level anomalies using variance reduction studies. All accuracy assessment methods show consistent results. We conclude that all the contemporary ocean tide models evaluated have similar performance in the selected coastal regions. However, their accuracies are region-dependent and overall are significantly worse than those in the This is the Pre-Published Version.Page 2 of 33 deep-ocean, which are at the 2-3 cm RMS (root-mean-square) level. The Gulf of Mexico and Northwest Atlantic regions present the least reduction of altimetry sea surface height variability after ocean tides are removed, primarily because of large oceanic variability associated with loop currents in the Gulf of Mexico and the Gulf Stream in the Northwest Atlantic.

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A 3‐D data‐assimilative tidal model of the northwest Atlantic

Abstract: A three-dimensional (3-D) barotropic tidal model for the northwest Atlantic is developed for eight leading semi-diurnal (M 2 , S 2 , N 2, K 2 ) and diurnal (K 1 , O 1 , P 1 , Q 1 ) tidal constituents based on the Princeton Ocean Model (POM).

Cited by 14 publications

References 22 publications

Modelling Temperature, Currents and Stratification in Placentia Bay

Modelling Temperature, Currents and Stratification in Placentia Bay

Modelling Extreme Storm-Induced Currents over the Grand Banks

Evaluation of Ocean Tide Models Used for Jason-2 Altimetry Corrections

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