Seasonal Circulation on the Western and Central Scotian Shelf*

Hannah, Charles G.; Shore, Jennifer; Loder, John W.; Naimie, Christopher E.

doi:10.1175/1520-0485(2001)031<0591:scotwa>2.0.co;2

Cited by 138 publications

(147 citation statements)

References 47 publications

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“…1. The hydrographic setting on the Scotian Shelf (see, for example, Loder et al, 1997;Hannah et al, 2001). The position of the CARIOCA buoy (red star) and the Sable Island Meteorological Station are indicated.…”

Section: Newfoundlandmentioning

confidence: 99%

“…1). The Scotian Shelf is uniquely located at the junction of the North Atlantic sub-polar and sub-tropical gyres, downstream of the St. Lawrence River system (Loder et al, 1997;Hannah et al, 2001). The seasonal shelf-scale circulation is dominated by the Nova Scotia Current flowing to the southwest roughly parallel to the coast, and an extension of the Labrador Current, flowing in the same direction, along the shelf edge (Loder et al, 1997).…”

Section: Oceanographic Settingmentioning

confidence: 99%

See 1 more Smart Citation

Air-Sea CO<sub>2</sub> fluxes on the Scotian Shelf: seasonal to multi-annual variability

et al. 2010

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Abstract.We develop an algorithm to compute pCO 2 in the Scotian Shelf region (NW Atlantic) from satellite-based estimates of chlorophyll-a concentration, sea-surface temperature, and observed wind speed. This algorithm is based on a high-resolution time-series of pCO 2 observations from an autonomous mooring. There is a gradient in the air-sea CO 2 flux between the northeastern Cabot Strait region which acts as a net sink of CO 2 with an annual uptake of 0.50 to 1.00 mol C m −2 yr −1 , and the southwestern Gulf of Maine region which acts as a source ranging from −0.80 to −2.50 mol C m −2 yr −1 . There is a decline, or a negative trend, in the air-sea pCO 2 gradient of 23 µatm over the decade, which can be explained by a cooling of 1.3 • C over the same period. Regional conditions govern spatial, seasonal, and interannual variability on the Scotian Shelf, while multi-annual trends appear to be influenced by larger scale processes.

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Section: Newfoundlandmentioning

confidence: 99%

Section: Oceanographic Settingmentioning

confidence: 99%

Air-Sea CO<sub>2</sub> fluxes on the Scotian Shelf: seasonal to multi-annual variability

et al. 2010

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“…The former is a mixture of coastal water and Gulf Stream water that flows primarily eastward, while the latter is a mixture of Labrador Current and North Atlantic Central waters that flows mostly southwestward (McLellan, 1957;Gatien, 1976). The offshore branch of the Labrador Current reduces its transport while flowing along the Nova Scotia shelf break and entering the Gulf of Maine through the Northeast Channel (Hannah et al, 2001;Han, 2007).…”

Section: Review Of Circulation and Hydrographic Features On The Eastementioning

confidence: 99%

Interannual Variability of the Circulation over the Eastern Canadian Shelf

Urrego-Blanco

Jiang

2012

Atmosphere-Ocean

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This study examines the main physical processes affecting the interannual variability of circulation over the eastern Canadian continental shelf (ECS) based on numerical circulation results for the period [1988][1989][1990][1991][1992][1993][1994][1995][1996][1997][1998][1999][2000][2001][2002][2003][2004] produced by a regional ocean-ice model. The regional circulation model is applied to the northwest Atlantic and uses a horizontal curvilinear grid with a horizontal resolution of approximately 1/4°. The model is forced by atmospheric reanalysis fields produced by Large and Yeager (2004) and boundary forcing based on the ocean reanalysis data produced by Smith et al. (2010). In comparison with previous observational and numerical results in the literature, the regional circulation model has reasonable skill in simulating the large-scale circulation and associated seasonal and interannual variability over the ECS. Complex Empirical Orthogonal Function (CEOF) analysis is used to examine the interannual variability in the monthly mean temperature and salinity anomalies in the model. The CEOF analysis of model results demonstrates that the interannual variability over the Labrador and northern Newfoundland shelves is significantly affected by the variability at high latitudes which propagates onto these shelves through the northern open boundary. Over the eastern Newfoundland Shelf, the interannual variability is significantly affected by the non-linear interaction of the Labrador Current with the North Atlantic Current and by the variability propagating from the southern Labrador Shelf. The interannual variability of circulation and hydrography over the Slope Water region off the Scotian Shelf is significantly affected by anomalies advected by the Gulf Stream and by the non-linear dynamics taking place in the deep waters to the south of the Tail of the Grand Banks. (2010). Comparativement aux résultats observationnels et numériques précédents que l'on trouve dans la littérature, le modèle de circulation régional possède une habileté raisonnable pour la simulation de la circulation à grande échelle et de la variabilité saisonnière et interannuelle associée sur l'ECS. Nous utilisons l'analyse par fonctions orthogonales empiriques complexes (CEOF) pour examiner la variabilité interannuelle des anomalies mensuelles moyennes de température et de salinité dans le modèle. L'analyse par CEOF des résultats du modèle montre que la variabilité interannuelle sur les plateaux du Labrador et du nord de Terre-Neuve est significativement influencée par la variabilité aux hautes latitudes qui se propage sur ces plateaux à travers la limite nord ouverte. Sur le plateau de l'est de Terre-Neuve, la variabilité interannuelle est significativement influencée par l'interaction non linéaire du courant du Labrador avec le courant de l'Atlantique Nord et par la variabilité se propageant depuis le plateau du sud du Labrador. La variabilité interannuelle de la circulation et de l'hydrographie dans la région du talus continental au ...

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“…2-4), suggesting that the higher concentrations of these metals might be linked to increases in annual discharge rates and/or the cumulative discharge of the produced water with time. Evidently, the highest concentrations of trace metals associated with raw produced water were found in the sediments mainly to the east of the platform which is in the mean current drift direction (Hannah et al, 2001). Yeats et al (in press) argued that the higher concentrations of barium could be the result of sedimentary Ba that originated from drilling muds, however, they also pointed out that drilling mud would not necessarily explain the above background observations of Fe and Mn concentrations that were found in the sediments closest to the production platform.…”

Section: Bottom Sediment Trace Metal Monitoringmentioning

confidence: 98%

Analysis of bacterial diversity and metals in produced water, seawater and sediments from an offshore oil and gas production platform

Yeung

Law

Milligan

et al. 2011

Marine Pollution Bulletin

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Produced water is one of the largest waste products routinely discharged into the ocean from offshore oil and gas platforms. This study analyzed bacterial communities and metals in the produced water, surrounding seawater, and sediment around the Thebaud platform. The bacterial community within the produced water was different from the seawater (SAB = 13.3), but the discharge had no detectable effect on the bacterial communities in the seawater (SAB > 97). In contrast, genomic analysis of sediments revealed that the bacterial community from 250 m was different (SAB = 70) from other locations further from the discharge, suggesting that the produced water had a detectable effect on the bacterial community in the sediment closest to the discharge. These near-field sediments contained elevated concentrations of manganese and iron that are associated with the produced water effluent. The results suggested that the discharge of produced water has influenced the bacterial community structure of sediments adjacent to the platform.Crown

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Seasonal Circulation on the Western and Central Scotian Shelf*

Cited by 138 publications

References 47 publications

Air-Sea CO<sub>2</sub> fluxes on the Scotian Shelf: seasonal to multi-annual variability

Air-Sea CO<sub>2</sub> fluxes on the Scotian Shelf: seasonal to multi-annual variability

Interannual Variability of the Circulation over the Eastern Canadian Shelf

Analysis of bacterial diversity and metals in produced water, seawater and sediments from an offshore oil and gas production platform

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Seasonal Circulation on the Western and Central Scotian Shelf*

Cited by 138 publications

References 47 publications

Air-Sea CO&lt;sub&gt;2&lt;/sub&gt; fluxes on the Scotian Shelf: seasonal to multi-annual variability

Air-Sea CO&lt;sub&gt;2&lt;/sub&gt; fluxes on the Scotian Shelf: seasonal to multi-annual variability

Interannual Variability of the Circulation over the Eastern Canadian Shelf

Analysis of bacterial diversity and metals in produced water, seawater and sediments from an offshore oil and gas production platform

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Product

Resources

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Air-Sea CO<sub>2</sub> fluxes on the Scotian Shelf: seasonal to multi-annual variability

Air-Sea CO<sub>2</sub> fluxes on the Scotian Shelf: seasonal to multi-annual variability