Internal tides resulting from the passage of surface tides through an eddy field

Krauß, W.

doi:10.1029/1999jc900067

Cited by 7 publications

(3 citation statements)

References 14 publications

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“…However, so far no observations have shown that eddies in the ocean can be the direct source for generation of internal waves, although recent observational studies show that the local internal wave field can be enhanced by draining energy from eddies (Cl ement et al, 2016). Previously, it was also shown that interaction of surface barotropic tides with the baroclinic eddy field could produce internal tides (Krauss, 1999).…”

Section: Introductionmentioning

confidence: 99%

Observations of internal waves generated by an anticyclonic eddy: a case study in the ice edge region of the Greenland Sea

Johannessen¹,

Sandven

Chunchuzov³

et al. 2019

Tellus A: Dynamic Meteorology and Oceanography

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Internal waves in the ocean play an important role in turbulence generation due to wave-breaking processes and mixing of the ocean. Airborne radar images of internal waves and ocean eddies north of Svalbard suggested that ocean eddies could generate internal waves. Here, we test this hypothesis using data from a dedicated internal wave experiment in the Greenland Sea. Internal waves with dominant frequencies of 1-3 cycles per hour and amplitudes up to 15 m were observed using three thermistor chains suspended from a drifting array conveniently placed on the ice in a triangle with sides of several km. Analysis shows that internal waves propagated westwards with a speed of about 0.2 m/s and wavelength of 0.4-1.0 km, away from an anticyclonic ocean eddy located just east of the array. This was consistent with the remote-sensing observations of internal waves whose surface signature was imaged by an airborne radar in the western part of this eddy, and with theories that eddies and vortexes can directly generate internal waves. This case study supports our hypothesis that ocean eddies can be the direct sources of internal waves reported here for the first time and not only enhancing the local internal wave field by draining energy from the eddies, as studied previously. The present challenge is to explore the role of eddies as a new source in generating internal waves in the global ocean.

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Section: Introductionmentioning

confidence: 99%

Observations of internal waves generated by an anticyclonic eddy: a case study in the ice edge region of the Greenland Sea

Johannessen¹,

Sandven

Chunchuzov³

et al. 2019

Tellus A: Dynamic Meteorology and Oceanography

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“…Ring events have been known to generate internal tides due to stratification, resulting from the presence of low-salinity water (Krauss 1999), and internal tides and tidal bores generally occur more frequently during quarter moons (Pineda 1995). However, during the first 7 mo of this study period, brachyuran post-larvae (megalopae) exhibited semi-lunar settlement pulses regardless of the presence of NBC rings (Reyns & Sponaugle 1999).…”

Section: Discussionmentioning

confidence: 65%

Lunar cyclic population replenishment of a coral reef fish: shifting patterns following oceanic events

Sponaugle¹,

Pinkard²

2004

Mar. Ecol. Prog. Ser.

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We examined the relationship between the pelagic environment and the lunar timing of reproduction and recruitment of a coral reef fish by comparing patterns exhibited by fish under normal oceanographic conditions with patterns exhibited by fish that experienced significantly different pelagic conditions (i.e. encounter with meso-scale, low-salinity North Brazil Current [NBC] rings passing by the island of Barbados). We used a 20 mo time series of bluehead wrasse Thalassoma bifasciatum recruitment, and compared larval growth and the timing of settlement and (successful) spawning recorded in the otoliths of individual recruits that encountered an NBC ring (RING fish) with those that did not (NO RING fish). Spawning occurred during all times of the lunar cycle, but during NO RING conditions, only those larvae spawned during the first-quarter moon were retained nearshore. Successful NO RING recruits were spawned during the first-quarter moon, grew rapidly as larvae, and settled during the third-quarter moon and neap tides. In contrast, during RING events, larvae spawned during all lunar phases were retained nearshore. Successful RING recruits were spawned over the entire lunar cycle, grew more slowly as larvae, and settled during both quarter moons. Fish settling during the first-quarter moon were of higher condition than third-quarter-moon settlers, which is consistent with the concept of higher predation losses and selective mortality of settlers during less-than-optimum periods. Synchronized settlement patterns can be decoupled from spawning patterns by pelagic processes and flexible larval growth schedules. Variable pelagic conditions may contribute to the maintenance of daily reproduction and flexible growth histories in marine species.

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“…Regarding how ME affects the generation of IT, studies have shown that the interaction between BT and baroclinic eddy field can generate internal waves (Krauss, 1999), which are most efficiently generated when their horizontal scales are comparable (Lelong and Kunze, 2013). ME mostly modulates the propagation of IT in terms of refraction and scattering.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of interaction between anticyclonic eddy and semidiurnal internal tide in the northeastern South China Sea

Fan,

Sun,

Yang

et al. 2023

Preprint

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Abstract. We investigate interaction between an anticyclonic eddy (AE) and semidiurnal internal tide (SIT) on the continental slope of the northeastern South China Sea (SCS), using a high spatiotemporal resolution numerical model. Two key findings are as follows. First, the AE promotes energy conversion from low-mode to higher-mode SIT; additionally, production terms indicate that the energy is also transferred from the SIT field to the eddy field at an average rate of -3.0 mW m-2. Second, the AE can modify the spatial distribution of tidal-induced dissipation by both refracting and reflecting low-mode SIT. The phase and group velocities of the SIT are significantly influenced by the eddy field, resulting in a shift of the internal tidal rays to the north or south. These findings deepen our understanding of complex interactions between AE and SIT and of their impacts on energy conversion, wave propagation, and coastal processes.

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Internal tides resulting from the passage of surface tides through an eddy field

Cited by 7 publications

References 14 publications

Observations of internal waves generated by an anticyclonic eddy: a case study in the ice edge region of the Greenland Sea

Observations of internal waves generated by an anticyclonic eddy: a case study in the ice edge region of the Greenland Sea

Lunar cyclic population replenishment of a coral reef fish: shifting patterns following oceanic events

Numerical investigation of interaction between anticyclonic eddy and semidiurnal internal tide in the northeastern South China Sea

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