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From hydrographic measurements, Petrie et al. There are also many other factors that could affect the performance of the coupled ocean‐ice model, such as (a) the use of a relatively simple sea ice thickness distribution formulation with two categories (open water and thick ice) in the model, (b) accuracy of atmospheric forcing, ocean surface conditions including the net heat and freshwater fluxes, and (c) representations of feedbacks between the atmosphere and the ocean‐ice system. In February and March, sea ice appears over the eastern Scotian Shelf and the Laurentian Channel outside the GSL in Exp‐Control. Desert __, code for Gulf War's military campaign. On the Southeast. This paper examines the subtidal circulation and associated variability in the Gulf of St. Lawrence, the Scotian Shelf, and the Gulf of Maine (GSL-SS-GOM) in 1988–2004 based on results produced by a nested-grid shelf circulation model. Romaine Formation. Model errors in fall are slightly negative (μ = −0.65°C), indicating that model estimates of SSTs, on average, are slightly warmer than the remote sensing data (Figure 7d). In January, thin ice with relatively low concentrations appears over the central GSL. So huge is the gulf that half of Canada’s … The PDF of the errors in the seasonal cycle of the reanalyzed wind speeds ( Formation and distribution of sea ice in the Gulf of St. Lawrence: A process-oriented study using a coupled ocean-ice model Jorge Urrego-Blanco 1and Jinyu Sheng 1Department of Oceanography, Dalhousie University, Halifax, Nova Scotia, Canada Abstract A coupled ocean-ice model for the eastern Canadian shelf is used to examine main physical In March, sea ice is advected from the interior of the GSL toward Cabot Strait, increasing the ice concentrations in the region. The low‐frequency variations in the reanalysis of air temperature at Charlottetown are generally within ±0.5°C of the counterparts of observations, except for relatively large errors of ∼1.5°C in 1999 (Figure 3d). February is the month with the largest sea ice coverage in this area. The annual cycle is obtained by first applying a 120 point (or 30 day) running average to the time series to remove frequencies higher than 30 days and then averaging the band‐passed time series over 17 years. The seasonal cycle of the reanalyzed air temperatures, however, lags behind the observed seasonal cycle by about 2 weeks. Basque whalers from Saint-Jean-de-Luz sailed into the Gulf of Saint Lawrence in 1583 and began whaling at Tadoussac. The model has a fine-resolution child model (∼ (1/12)°) embedded inside a coarse-resolution parent model (∼ (1/4)°) of the northwest Atlantic. The Gulf is also home to endangered whale species such as the North Atlantic right whale and the blue whale, whose numbers have rapidly decreased due to collisions with ships. In February, sea ice is present over most of the GSL, with observed concentrations near 100% over the western Gulf and between 40 and 80% over the eastern Gulf. The formation ranges between 110 to 120 feet in thickness and covers about 12,800 square miles of southeastern Minnesota. A coupled ocean-ice model for the eastern Canadian shelf is used to examine main physical processes affecting sea ice conditions in the Gulf of St. Lawrence (GSL) and adjacent waters. Both the PM and CM are coupled using a two‐way nesting technique in which the PM provides lateral open boundary conditions to the CM, and the CM results are used to adjust the PM fields over the region where the CM and PM overlap. The vertical subgrid‐scale vertical mixing is based on a parameterization using the turbulent closure scheme of Gaspar et al. Oceanogr., 50(5): 1654–1666. The coupled model is forced by atmospheric reanalysis fields produced by Large and Yeager (2004). Geophysics, Geomagnetism The smallest reanalysis errors in wind speeds occur at low frequencies ( Smyth ; engraved by P. Canot. Probability density functions of model errors in simulating sea surface temperatures in the Gulf of St. Lawrence in (a) winter, (b) spring, (c) summer, and (d) fall in the 17 year period 1988–2004. and you may need to create a new Wiley Online Library account. A line running from Cape Bauld (North point of Kirpon Island, 51°40′N 55°25′W / 51.667°N 55.417°W / 51.667; -55.417) to the East extreme of Belle Isle and on to the Northeast Ledge (52°02′N 55°15′W / 52.033°N 55.250°W / 52.033; -55.250). The colors in the .eps-file are ready for print (CMYK). This margin hosts numerous, prolific petroleum reservoirs and … As a result, a third of Basque whale oil could not be sold. From top to bottom, figures show (a) the original time series, (b) the seasonal cycle, (c) the high‐frequency, and (d) the low‐frequency component. In February and March, the simulated ice‐covered areas produced by the model in Exp‐Control are smaller than the counterparts in Exp‐NoDYN, particularly along Québec's northeastern shore and over coastal waters between the Gaspé Peninsula and Northumberland Strait. [1999] using a relaxation time scale of 2 months. Cartier also called the St. Lawrence River the “ rivière du Canada,” a name used until the early 1600s. As a result, the winter circulation is significantly weaker than otherwise would be in absence of the ice cap at the sea surface. Percé Rock was an important landmark for early European colonists and is a fitting goal for an exploration of Gaspé. Smyth ; engraved by P. Canot. Sea ice is also exported from the GSL through western Cabot Strait. Based on the field observations made in the Arctic, Hutchings and Rigor [2012] found that sea ice melting and minimum summer ice extent in the Beaufort Sea are preconditioned by sea ice dynamics. The Gulf of St. Lawrence is subjected to substantial environmental pressures linked to climate change, ocean acidification and toxic waste dumping. It should be noted that the lack of tidal currents and relatively course horizontal model resolution could be two of main reasons for the model deficiency of underestimating the effect of ice deformation over the Estuary. At Cabot Strait, sea ice concentrations are relatively lower than those inside the GSL. The Gulf of St. Lawrence (GSL) is a semienclosed sea located in the eastern Canadian shelf, which is the habitat of ecologically and economically important marine species [Dufour and Ouellet, 2007]. and Chemical Oceanography, Physical It should be noted that the total sea ice area produced by the coupled ocean‐ice model is lower than the total observed area by ∼20%. Time series of domain‐integrated ice area over the Gulf of St. Lawrence and adjacent waters produced in Exp‐UNSTAB (thick line) and Exp‐STAB (thin line) in the 4 year period 1988–1991. Figure 16b shows time series of sea ice volume over a grid cell to the southeast of Anticosti Island (location A in Figure 1) between 1988 and 1991. We want to thank Keith Thompson, Greg Smith, and other anonymous reviewer for their constructive and helpful comments. Cruising Canada's Gulf of St. Lawrence. A coupled ocean-ice model for the eastern Canadian shelf is used to examine main physical processes affecting sea ice conditions in the Gulf of St. Lawrence (GSL) and adjacent waters. A coupled ocean‐ice model for the eastern Canadian shelf is used to examine main physical processes affecting sea ice conditions in the Gulf of St. Lawrence (GSL) and adjacent waters. (right) Differences between the monthly mean sea ice thickness in Exp‐Control and Exp‐NoDYN. At the Strait of Belle Isle, the annual mean westward transport in the model is ∼0.18 Sv, with maximum and minimum monthly mean transports of ∼0.39 Sv in January and ∼0.03 Sv in July, respectively. Thus, some small‐scale features such as coastal upwelling are better represented by the model than the satellite remote sensing data set. ) is applied directly at the ocean surface regardless of presence of sea ice at each model grid cell. The PDFs of reanalysis errors discussed above indicate that the atmospheric reanalysis fields are acceptable to be used in forcing the ocean‐ice model. A line from Cape Canso (45°20′N 61°0′W / 45.333°N 61.000°W / 45.333; -61.000) to Red Point (45°35′N 60°45′W / 45.583°N 60.750°W / 45.583; -60.750) in Cape Breton Island, through this Island to Cape Breton [45°57′N 59°47′W / 45.950°N 59.783°W / 45.950; -59.783] and on to Pointe Blanche (46°45′N 56°11′W / 46.750°N 56.183°W / 46.750; -56.183) in the Island of St. Pierre, and thence to the Southwest point of Morgan Island (46°51′N 55°49′W / 46.850°N 55.817°W / 46.850; -55.817). __ and Lacey, New York women police detectives. The sea ice has significant seasonal variability in the GSL. 2009/014. Old Harry is a large (43,000-acre), undrilled structure with four-way closure located in approximately 470 m of water in the Gulf of St. Lawrence, straddling the … In Exp‐Control, the ocean surface experiences the wind stress from the atmosphere ( In comparison with results in Exp‐Control, the ice production in Exp‐NoDYN is not as high over the shallow and coastal waters within the GSL. Hery. The GSL is affected by large riverine input, oceanic and atmospheric forcing, and sea ice. Latest. Use the link below to share a full-text version of this article with your friends and colleagues. The PDF of the errors in the high‐frequency component of the reanalyzed air temperatures ( As a result, the amount of sea ice produced by the coupled ocean‐ice model represents the lower limit of the actual amount over the areas where high stresses on the sea ice induced by strong tidal currents [Smith et al., 2006b] are neglected in this study. in the Gulf of St. Lawrence in eastern Canada allowed us to report, for the first time since its extinction, the occurrence of N. seminae in Canadian continental waters (Starr et al., 2002; Therriault et al., 2002). Monthly mean (left) observed and (middle) simulated sea ice concentrations in winter months calculated from observational estimates (Canadian Ice Service) and model results during the 17 year period 1988–2004. Analysis of model results indicates that local production of sea ice is important in shallower areas over the northern and western GSL. IHO Special Publication, 23. International Hydrographic Organization (IHO): Monaco. One of major limitations in this study is the lack of a multicategory ice thickness formulation in the sea ice component, since sea ice of different thicknesses has different thermal properties and thick ice grows and melts more slowly than thin ice. Red (blue) contours indicate the observed concentrations are higher (lower) than the concentrations produced by the model. Using dinoflagellates to reconstruct sea surface salinity at the mouth of the Gulf of St. Lawrence, de Vernal et al. Ssts are higher ( lower ) than the observations at this station ice thickens and covers most of the day... I ) calculated based on NEMO and uses OPA9 as the ice at! ( convergent ) sea ice in the Bonaventure Island, near Perce at... 1988–1991 ) model results in the ocean circulation component and LIM2 as the seasons. 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