Semi-diurnal tidal currents at ‘site D’

Magaard, Lorenz; McKee, W. D.

doi:10.1016/0011-7471(73)90071-5

Cited by 19 publications

(21 citation statements)

References 6 publications

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“…Tidal observations at only two depths prevent modal decomposition of vertical tidal structure [cf. Magaard and McKee, 1973;Feng et al, 1998] so that estimation of the relative contribution of various vertical modes is not possible. Following Hendry [1977], Dushaw et al [1995], and Dushaw and Worcester [1998] we expect that only the first baroclinic mode retains coherence with barotropic tides for long periods and plays a major role in the formation of baroclinic tides in the region under study.…”

Section: C05020mentioning

confidence: 99%

“…Until the end of the 1970s the accepted view was that baroclinic tides were incoherent with the associated barotropic tides, and thus would have random phase and small vertical and horizontal correlations [cf. Radok et al, 1967;Magaard and McKee, 1973;Regal and Wunsch, 1973;Wunsch, 1975]. Then Schott [1977] and Hendry [1977] detected energetic coherent (phase locked relative to the barotropic tide) baroclinic tidal waves in the North Atlantic.…”

Section: Introductionmentioning

confidence: 99%

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Barotropic and baroclinic tidal currents on the Mackenzie shelf break in the southeastern Beaufort Sea

2004

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[1] Tidal currents near the outer shelf break of the Mackenzie Shelf in the southern Beaufort Sea were examined using year-long (1987)(1988) current measurements from the upper ($35 m) and lower ($150 m) layers at four sites along the southeast (SS1), northeast (SS2), north central (SS3), and northwest (SS4) perimeter of the shelf. At all stations, semidiurnal currents were dominant, and upper layer currents were approximately double those observed in the lower layer. Maximum M 2 currents were observed above the sharp northeastern corner of the Mackenzie Shelf (6.0-7.5 cmÁs À1 ), while in the Mackenzie Canyon they were negligible. Diurnal currents were weaker and depth uniform; maximum K 1 currents (1.5-3.0 cmÁs À1 ) were found in the eastern part of the shelf. Diurnal and lower layer semidiurnal currents were in good agreement with those computed numerically by Kowalik and Proshutinsky [1994], indicating that these currents are essentially barotropic. In contrast, upper layer semidiurnal currents were mainly baroclinic. About 74% of the total energy of semidiurnal currents was associated with baroclinic coherent (phase-locked) tidal currents, while barotropic (12%), baroclinic incoherent (7%), and inertial (7%) components are the remaining semidiurnal currents in this area. High baroclinic generation coefficients (the ratio of locally generated baroclinic waves to barotropic waves) for stations SS2 and SS3 (about 7.0-8.0 in comparison with 0.3 for SS1 and SS4) located near the northeastern Mackenzie Shelf identify this region as a probable generation source of intensive internal tidal waves, which become then locally resonantly trapped between the shelf and the critical latitudes.

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Section: C05020mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Barotropic and baroclinic tidal currents on the Mackenzie shelf break in the southeastern Beaufort Sea

2004

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“…It is well-known that velocities due to internal tides are a major source of confusion in efforts to interpret deep-ocean tidal currents (Regal andWunsch, 1973 andMagaard andMcKee, 1973). Besides the addition of energy to barotropic tidal current estimates, the intermittent nature of internal tides results in large uncertainties of both amplitudes and phases in these estimates.…”

Section: Trapped Internalmentioning

confidence: 99%

Analysis and interpretation of tidal currents in the coastal boundary layer

May¹

1979

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“…Magaard and McKee (1973) analyzed current meter records obtained from a site in the western North Atlantic, termed 'site-D', and found that intermittent semi-diurnal internal tides occurred which were predominant near the sea surface. Regal and Wunsch (1973) also studied semi-diurnal internal tides at site-D, and found that the baroclinic tidal energy was concentrated near the surface.…”

Section: Introductionmentioning

confidence: 99%

Propagation of semi-diurnal internal tides observed off fukushima, along the east coast of Japan

Matsuno

1991

Journal of the Oceanographical Society of Japan

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A b s t r a c t : Analysis of current velocity and temperature records obtained from moored buoy systems deployed off the east coast of Japan reveals the intermittent occurrence of semi-diurnal internal tides and their manner of propagation. The internal tidal waves clearly propagate toward the shore, which is confirmed by cross-correlation of the onshore current velocity and temperature between neighboring stations. The propagation speed of the internal tide increases with water depth except in the area furthest offshore. In this area, motions near the second mode seem to occur occasionally, while in the nearshore area the motions for the most part consist of the first mode.Through harmonic analysis, it is shown that the M2 internal motions were not vertically homogeneous. That is, the internal motions are greater at the lower level in the nearshore area while they are greater at the upper level in the offshore area. Pathways along which the energy of the internal tide should propagate are estimated in such a way that the characteristic curves pass through the area over which relatively large onshore/offshore M2 velocity is distributed. The movement of the characteristic ray of a certain phase explains the observed phase velocity estimated from the cross-correlation diagrams. Internal motions around the characteristic ray were pronounced in a rather wide area. Thus, it is suggested that the generation region of the internal tide in the present study area might be relatively wide.

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Semi-diurnal tidal currents at ‘site D’

Cited by 19 publications

References 6 publications

Barotropic and baroclinic tidal currents on the Mackenzie shelf break in the southeastern Beaufort Sea

Barotropic and baroclinic tidal currents on the Mackenzie shelf break in the southeastern Beaufort Sea

Analysis and interpretation of tidal currents in the coastal boundary layer

Propagation of semi-diurnal internal tides observed off fukushima, along the east coast of Japan

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