Propagation of internal tides from the upper slopes of the Bay of Biscay

Pingree, R. D.; Mardell, G. T.; New, Adrian L.

doi:10.1038/321154a0

Cited by 156 publications

(97 citation statements)

References 17 publications

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“…Moreover, in the Celtic Sea, coccolithophore blooms (Emiliania huxleyi) may also occur during summer (Fernandez et al, 1993). Finally, Pingree et al (1986) demonstrate a chlorophyll increase over the shelf break of the northern French shelf, due to internal and tidal waves; these rather exceptional and short bloom events occur during neap tides in spring.…”

Section: Study Area Materials and Methodsmentioning

confidence: 99%

“…The first one, in late winter or early spring, is associated with a shallowing of the mixed layer and with a strengthening of the rather shallow thermocline. Moreover, internal waves associated with strong spring neap tides cause nutrient injection into the photic zone and subsequent phytoplankton blooms at the shelf break in the northern part of the basin (Pingree et al, 1986). The second main bloom event, less marked than the first one, is commonly recorded in autumn, when the summer thermocline starts to be eroded by a deepening of mixing.…”

Section: Introductionmentioning

confidence: 99%

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Live benthic foraminiferal faunas from the Bay of Biscay: faunal density, composition, and microhabitats

Fontanier

Jorissen

Licari

et al. 2002

Deep Sea Research Part I: Oceanographic Research Papers

461

280

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In the meso-oligotrophic Bay of Biscay, a diminishing downward organic matter flux with depth is accompanied by an important decrease of the live foraminiferal density. Although bottom water oxygenation is not directly influenced by organic matter input, the oxygenation of interstitial waters and the primary redox fronts do change in response to variations of the organic matter flux. The occurrence of deep and intermediate infaunal taxa can be linked to fundamental redox fronts and putative associated bacterial consortia. Our data are in agreement with the TROXmodel, which explains the benthic foraminiferal microhabitat as a function of organic flux and benthic ecosystem oxygenation. Both the depth of the principle redox fronts and the microhabitat of deep infaunal species show important increases with depth. At the deepest oligotrophic stations, deep infaunal faunas become relatively poor. Therefore, the exported flux of organic matter appears to be the main parameter controlling the composition and the vertical distribution of benthic foraminiferal faunas below the sediment-water interface. The oxygenation of pore waters plays only a minor role. A species-level adaptation of the TROX-model is presented for the Bay of Biscay. r

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Section: Study Area Materials and Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Live benthic foraminiferal faunas from the Bay of Biscay: faunal density, composition, and microhabitats

Fontanier

Jorissen

Licari

et al. 2002

Deep Sea Research Part I: Oceanographic Research Papers

461

280

View full text Add to dashboard Cite

show abstract

“…The Bay of Biscay is one of the areas with the strongest internal tides in the world (e.g. Jézéquel et al, 2002 andPingree et al, 1986) therefore it can be suggested that the influence of internal tides may be significant in the Explorer and Dangeard canyons although longterm current meter observations would need to be acquired to confirm this.…”

Section: Canyon Evolutionmentioning

confidence: 99%

The Dangeard and Explorer canyons, South Western Approaches UK: Geology, sedimentology and newly discovered cold-water coral mini-mounds

Stewart

Davies

Guinan

et al. 2014

Deep Sea Research Part II: Topical Studies in Oceanography

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The Celtic Margin is a complex area in terms of sedimentary dynamics and evolution, with a number of submarine canyons dissecting the continental slope and outer continental shelf. The complex terrain and diverse range of sea-bed sediments play a part in submarine canyons being described as areas of high habitat heterogeneity. This study has concentrated on the heads of two canyons: Dangeard (also known as Dangaard) and Explorer (first named here) located in UK territorial waters, in water depths between 138 and 1165 m. Multibeam echosounder, 2D reflection seismic and photographic ground-truthing data have been combined to map the sea-bed geomorphology, sedimentary features and canyon megafauna of these canyons. In addition, two previously unknown provinces of cold-water coral (CWC) mini-mounds were discovered on the interfluves of the Dangeard and Explorer canyons.The study area comprises a dendritic network of gullies feeding into the canyon thalwegs. Amphitheatre rims, where slope angles are commonly in excess of 20°, occur along the margins and heads of both canyons and are interpreted as drainage basins indicative of retrogressive mass-wasting in a shelfward direction.The CWC mini-mounds occur in water depths between 250 m and 410 m, with more than 400 mounds identified. They are up to 3 m in height and 50-150 m in diameter with no sub-surface expression, suggesting these mounds are, in geological terms, relatively young and possibly Holocene in age. Biological analyses revealed that the mounds form a habitat for ophiuroids and Munida associated with Lophelia pertusa coral rubble, suggesting these mini-mounds are not present-day living features.

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“…Insight has largely been gained by examining idealized 1D topographies (Khatiwala 2003;Llewellyn Smith & Young 2003;St Laurent et al 2003;Petrelis, Llewellyn Smith & Young 2006), or from observations (e.g. Pingree, Mardell & New 1986;Pingree & New 1989;Althaus, Kunze & Sanford 2003;Rudnick et al 2003;Nash et al 2006; Lee et al 2006). Generation by general 2D topography has required numerical simulation (Holloway & Merrifield 1999;Merrifield & Holloway 2002;Simmons et al 2004).…”

mentioning

confidence: 99%

Can barotropic tide–eddy interactions excite internal waves?

Lelong

Kunze

2013

J. Fluid Mech.

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The interaction of barotropic tidal currents and baroclinic geostrophic eddies is considered theoretically and numerically to determine whether energy can be transferred to an internal wave field by this process. The eddy field evolves independently of the tide, suggesting that it acts catalytically in facilitating energy transfer from the barotropic tide to the internal wave field, without exchanging energy with the other flow components. The interaction is identically zero and no waves are generated when the barotropic tidal current is horizontally uniform. Optimal internal wave generation occurs when the scales of tide and eddy fields satisfy resonant conditions. The most efficient generation is found if the tidal current horizontal scale is comparable to that of the eddies, with a weak maximum when the scales differ by a factor of two. Thus, this process is not an effective mechanism for internal wave excitation in the deep ocean, where tidal current scales are much larger than those of eddies, but it may provide an additional source of internal waves in coastal areas where horizontal modulation of the tide by topography can be significant.

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Propagation of internal tides from the upper slopes of the Bay of Biscay

Cited by 156 publications

References 17 publications

Live benthic foraminiferal faunas from the Bay of Biscay: faunal density, composition, and microhabitats

Live benthic foraminiferal faunas from the Bay of Biscay: faunal density, composition, and microhabitats

The Dangeard and Explorer canyons, South Western Approaches UK: Geology, sedimentology and newly discovered cold-water coral mini-mounds

Can barotropic tide–eddy interactions excite internal waves?

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