Meddy, spiral arms, and mixing mechanisms viewed by seismic imaging in the Tagus Abyssal Plain (SW Iberia)

Song, Haibin; Pinheiro, Luís Menezes; Ruddick, Barry; Teixeira, Francisco Curado

doi:10.1357/002224011799849309

Cited by 29 publications

(39 citation statements)

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“…Overall, this surface eddy is an onion-like structure with alternative reflective and blanking zones. Previous studies by Song et al [2011] and Menesguen et al [2012] have reported similar features of the subsurface Meddies. They suggested that the winding spiral arms might be responsible for those features.…”

Section: Seismic Transectssupporting

confidence: 64%

“…Previous studies by Song et al . [] and Menesguen et al . [] have reported similar features of the subsurface Meddies.…”

Section: Results and Interpretationsmentioning

confidence: 99%

“…Instead, there are distinct patches of reflections winding around the NE eddy flank. We interpret that these observations show a typical spiral arm structure similar to the previous observations [ Menesguen et al ., ; Song et al ., ]. The in situ observation of water properties also points to the spiral arm structure as described below.…”

Section: Results and Interpretationsmentioning

confidence: 99%

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Seismic observations from a Yakutat eddy in the northern Gulf of Alaska

2014

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Recent works show that the seismic oceanography technique allows us to relate water column seismic reflections to oceanic finescale structures. In this study, finescale structures of a surface anticyclonic eddy have been unveiled by reprocessing two seismic transects acquired in the northern Gulf of Alaska using an 8 km hydrophone streamer and 6600 cu in linear airgun array in September 2008. The eddy was a typical bowl-like structure with around 55 km width and 700 m depth. It has two fringes around the eddy base and a spiral arm at the NE edge. The in situ sea surface temperature and salinity data from a shipboard thermosalinograph help to confirm our interpretations of a spiral arm shed from the warm eddy and the entrained cold water from elsewhere. Nearby the eddy and offshore the shelf-break, there is a strong frontal feature, probably the Alaska Current. The eddy likely formed offshore Yakutat shelf and transported along the offshore shelf-break by tracking the sea level anomalies. Its equivalent diameter of 65 km was measured using the along-track altimeter and the seismic constraints. It was comparable with results from the representative conventional algorithms of eddy detection. Geostrophic velocities of the eddy were estimated from the dipping seismic reflections under the assumptions of approximate isopycnals and geostrophic balance. Measured water properties including sea surface temperature, salinity, and chlorophyll revealed that eddy translation transports coastal water to the pelagic regions. Structures synthesized from CTD profiles that sampled an earlier eddy suggest that thin striae around the base might be a common feature in Gulf of Alaska eddies.

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Section: Seismic Transectssupporting

confidence: 64%

“…Previous studies by Song et al . [] and Menesguen et al . [] have reported similar features of the subsurface Meddies.…”

Section: Results and Interpretationsmentioning

confidence: 99%

Section: Results and Interpretationsmentioning

confidence: 99%

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Seismic observations from a Yakutat eddy in the northern Gulf of Alaska

2014

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“…This would make the Gulf of Cadiz a ''cauldron,'' somehow alike to the ''Cape Cauldron'' [Boebel et al, 2003]. These strong nonlinear interactions may also trigger spiral arms recently observed around meddies [Song et al, 2011;M enesguen et al, 2012].…”

Section: Conclusion and Discussionmentioning

confidence: 93%

Evidence of Mediterranean Water dipole collision in the Gulf of Cadiz

et al. 2014

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“…A chaotic zone along the north periphery of the lens, which is less well developed than Meddies, is suggestive of a mixing zone (Song et al, 2011). The reflection of the dome-shaped upper edge is extremely strong and continuous.…”

Section: Discussionmentioning

confidence: 93%

Image of a subsurface current core in the southern South China Sea

Tang

Wang

et al. 2013

Ocean Sci.

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Abstract. A legacy seismic transect acquired on 30 and 31May 2009 in the southern South China Sea (SCS) was reprocessed to reveal the thermohaline structure of the water column. In the study region, a mesoscale subsurface lens with extraordinary features was detected at 113.5 • E, 11.5 • N. It is centred at 450 m depth, occupies both the subsurface and intermediate water from 250 to 600 m, and has an intersection diameter of around 60 km. The simulated results from Hybrid Coordinate Ocean Model reveal an eddy-induced subsurface current running southwestward along the deep basin edge and suggest that the imaged lens is a snapshot of the subsurface current core rather than a subsurface eddy.

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Meddy, spiral arms, and mixing mechanisms viewed by seismic imaging in the Tagus Abyssal Plain (SW Iberia)

Cited by 29 publications

References 0 publications

Seismic observations from a Yakutat eddy in the northern Gulf of Alaska

Seismic observations from a Yakutat eddy in the northern Gulf of Alaska

Evidence of Mediterranean Water dipole collision in the Gulf of Cadiz

Image of a subsurface current core in the southern South China Sea

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