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Hüebscher, C.; Figueiredo, Alberto G.; Kruse, Lothar; Spieß, V.

doi:10.1023/a:1023603221876

Cited by 20 publications

(4 citation statements)

References 21 publications

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“…A narrower mid-shelf region then follows, with depths up to 60 m, which in turn descends toward the open ocean to an outer shelf of nearly uniform width (defined here in the same fashion as in Johns et al, 1998). The shelf exhibits rough seafloor topography, especially around the 80 m isobath between 47°W and 51°W and 1°N and 4°N (see left panels A-D in Figure 1 and Hübscher et al, 2002), along with complex hydrodynamics resulting from the Amazon River plume, strong trade winds, semidiurnal tides, and NBC variability-all of which are closely related to ISW dynamics.…”

Section: Study Regionmentioning

confidence: 96%

“…Diverse and dynamic features that occur on the continental shelf off the mouth of the Amazon River in the southwest tropical Atlantic Ocean (Figure 1a) include the western boundary North Brazilian Current (NBC), strong tidal constituents, and more than 1,000 km of complex bottom bathymetry (Johns et al, 1998;Hübscher et al, 2002). Here, the Amazon River, which supplies approximately one-fifth of the total freshwater discharge into the world ocean, strongly modulates the surrounding stratification (e.g., Muller-Karger et al, 1988).…”

Section: Introductionmentioning

confidence: 99%

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Transcritical Flow and Generation of Internal Solitary Waves off the Amazon River: Synthetic Aperture Radar Observations and Interpretation

Lentini¹,

Magalhaes²,

Silva³

et al. 2016

Oceanog.

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Section: Study Regionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Transcritical Flow and Generation of Internal Solitary Waves off the Amazon River: Synthetic Aperture Radar Observations and Interpretation

Lentini¹,

Magalhaes²,

Silva³

et al. 2016

Oceanog.

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“…The delta formed at a time of high present-day sea level above relict sands that date from the low stand associated with the Last Glacial Maxima (LGM). However, the presence of submarine terraces suggests that the delta continues to be influenced by sea level, particularly during changes in its rate as occurred, for example, during the Younger Dryas [Hubscher et al, 2002].…”

Section: Geological and Geophysical Settingmentioning

confidence: 99%

Seismic structure, gravity anomalies, and flexure of the Amazon continental margin, NE Brazil

et al. 2009

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[1] Seismic and gravity data have been used to determine the structure of the sediments, crust, and upper mantle that underlie the Amazon continental margin, offshore NE Brazil. Seismic reflection profile data reveal a major unconformity at $7 s two-way travel time (TWTT) which we interpret as marking the onset of the transcontinental Amazon River and the formation of the Amazon deep-sea fan system in the late Miocene. Seismic refraction data show mean sediment velocities that decrease by >1.5 km s À1 in a seaward direction. We attribute this decrease to facies changes associated with sediment progradation and the development of topset, foreset, and bottomset beds. Seismic refraction data show that the sediments are underlain by oceanic crust that has a similar velocity structure compared to elsewhere in the Atlantic Ocean but is unusually thin ($4.2 km). We attribute the thin crust to either slow seafloor spreading or a limited magma supply during the initial rifting of South America and Africa in the Early Cretaceous. The seismic data have been used to construct a new sediment thickness grid that together with gravity anomaly data, suggests the Amazon fan loaded lithosphere with an unusually high flexural strength. While a high-strength lithosphere explains the overall depth of the seismic Moho, there are discrepancies (of up to 2 km) beneath the upper fan, where the modeled flexed Moho is shallower than the seismic Moho, and beneath the middle fan, where it is deeper. Gravity and seismic modeling suggest these discrepancies are caused by lateral changes in subcrustal density such that the mantle underlying the upper fan is denser than it is beneath the middle fan. We attribute these lateral density differences to proximity to the Ceara Rise, which is believed to have formed during the Late Cretaceous in a mid-ocean ridge setting. Fan loading of a relatively strong, dense, and, hence, cold lithosphere predicts stress orientations that are consistent with borehole breakout data and the location and height of the Gurupé Arch onshore. Despite its proximity to ''leaky'' transform faults, the margin that underlies the Amazon fan appears to be of nonvolcanic origin. The main differences with other nonvolcanic margins, such as West Iberia and Newfoundland, are a greater sediment accumulation, a narrower zone of transitional crust, and a lack of any evidence for extreme extension and mantle serpentinization.

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“…Depositional studies are generally focused on understanding sedimentary mass transport (Gruetzner et al, 2012;Lorenzoni et al, 2012) through submarine canyons between continental shelves and abyssal plains, and understanding the characteristics of the sandy turbidites deposited on an active margin, which reveals their characteristics and patterns of Quaternary sandy deposits distributed across the entire Venezuelan margin (Faugères et al, 1993; Figure 5C). These studies describe the sedimentary processes that occur near canyons as features formation (Bruhn and Walker, 1995), the sand bodies geometry (Bruhn and Walker, 1997;Hübscher et al, 2002), grain-size distribution (Heberer et al, 2010), submarine canyon as a conductor of sediments and nutrients (Bernhardt et al, 2015(Bernhardt et al, , 2016, and the characteristics of organic matter present in bulk surface sediments (Escobar et al, 2019; Figure 5Q).…”

Section: Depositional Systemsmentioning

confidence: 99%

The South American Advances in Submarine Canyons Studies and Their Link to the Ocean Decade

Silva¹,

Araújo²

2021

Front. Mar. Sci.

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Submarine canyons have a relevant role in marine ecosystems. They are responsible for oceanographic conditions such as variability of temperature and salinity, sediment transport, nutrients, and even pollutants amongst marine areas. Submarine canyon studies have been growing and reaching prominence due to their importance in the Blue Economy. Initiatives to promote sustainable development for the ocean have been discussed in the Ocean Decade. Although canyons studies are increasing, how can we integrate these with the Ocean Decade outcomes? Thus, we aim to demonstrate an overview of the advances of submarine canyons studies and their link to the Ocean Decade for South America. We analyzed 160 studies divided into spatiotemporal analysis and study approaches according to the Ocean Decade outcomes. We discuss these articles, building a timeline and argumentative topics considering the advances, and discuss gaps to predict the future of submarine canyons studies in the Ocean Decade and Blue Economy context.

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Cited by 20 publications

References 21 publications

Transcritical Flow and Generation of Internal Solitary Waves off the Amazon River: Synthetic Aperture Radar Observations and Interpretation

Transcritical Flow and Generation of Internal Solitary Waves off the Amazon River: Synthetic Aperture Radar Observations and Interpretation

Seismic structure, gravity anomalies, and flexure of the Amazon continental margin, NE Brazil

The South American Advances in Submarine Canyons Studies and Their Link to the Ocean Decade

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