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To study these topics, it is necessary to quantify fluxes across the ocean margin, fundamental for evaluating budgets of carbon, nutrients and trace elements between the continent, coastal zone and ocean.
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In the context of nutrient provision for primary production in the upper mixed layer, diffusion through the summer thermocline appears to be small unless internal waves strongly increase mixing.Ĭurrently, there is interest in enhanced productivity (possibly fuelled by oceanic nutrients) in coastal seas, transfer of dissolved and particulate matter from there to the ocean, shelf sea and coastal responses to changes in climate, sea level and human activities. Vertical mixing is intermittent, dominated by surface inputs (wind and waves) towards the southeast, internal waves of tidal origin are increasingly important for mixing across the thermocline • In 1995, one storm on 5–8 September roughly doubled the upper mixed-layer depth to >40 m and reinstated maximal primary production in the upper mixed layer • Stratification starts intermittently until early June, becomes shallower through June and deepens by September.
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Wind-, tide- and wave-forced currents are probably the most consistent agents of cross-slope exchange O(1 m 2 s −1 ), with topographic effects being important locally (canyons, spurs) • Other (wind- and eddy-forced) contributions to the currents are typically O(0.1 m s −1) or less, except on the shelf, and decrease with depth • Tidal currents are O(0.2 m s −1) on the adjacent shelf but O(0.1 m s −1) or less over most of Goban Spur they increase to the southeast • The along-slope flow, typically O(0.05 m s −1), is reduced or even reversed in spring, is generally weaker than at some other margin sectors owing to the non-meridional alignment and indentations in the Celtic Sea slope, and may sometimes overshoot rather than follow the depth contours around Goban Spur • Among these, there is evidence that • Causative physical processes are discussed: potentially northward flow along the continental slope, effects of Goban Spur topography, eddies, wind-driven transport, cascading, tides, fronts, internal tides, internal waves, surface waves. These data are combined in estimates of (seasonally dependent) mean flow, tidal currents, other current variability, exchange and mixing over the main cross-slope section studied in OMEX and in nearby and contrasted locations (aided by the use of earlier and adjacent measurements). They include currents measured on moorings, drogued-buoy tracks temperature and other data from CTD profiles, especially as indicators of vertical mixing evidence from models, particularly for turbulence causing vertical mixing. Observations adjacent to, prior to and during the Ocean Margin EXchange (OMEX) project of 1993–1996 are used.
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The physical context for ocean margin exchange at Goban Spur is described.