Deep sea corals off Brazil verify a poorly ventilated Southern Pacific Ocean during H2, H1 and the Younger Dryas

Mangini, Augusto; Godoy, José Marcus; Godoy, Maria Luiza D.P.; Kowsmann, Renato Oscar; Santos, Guaciara M.; Ruckelshausen, Mario; Schroeder-Ritzrau, Andrea; Wacker, Lukas

doi:10.1016/j.epsl.2010.02.041

Cited by 68 publications

(57 citation statements)

References 45 publications

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“…There may be a low Δ 14 C signal of this two-pulse release that spread as far as the North Pacific (39) and north Indian (40) oceans via AAIW. Although recent Δ 14 C evidence from the intermediatedepth Brazil margin supports this scenario (17), data from the Chilean and New Zealand margins do not (41,42). Evidence for a water mass with very low Δ 14 C values in the deepest parts of the ocean is contradictory (43,44), however, indicating that our understanding of the relationship between deep-ocean circulation, its interaction with the atmosphere, and carbon fluxes is incomplete.…”

Section: Resultsmentioning

confidence: 73%

“…Neodymium isotope data (ϵ Nd ) indicate that there may also have been an incursion of a Southern Ocean water mass similar to that of present-day AAIW (13), or alternatively that southern-sourced deep waters already filling the deep North Atlantic basin (14) shoaled to intermediate depth. Additional evidence for increased northward extent of AAIW at these times comes from elevated radiocarbon reservoir ages in North Atlantic planktonic foraminifera (15) and low, Southern Oceanlike Δ 14 C at mid-depth in the North Atlantic (16) and on the Brazil margin (17).…”

Section: Resultsmentioning

confidence: 99%

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Global climate evolution during the last deglaciation

Clark

Shakun

Baker

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

477

306

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Deciphering the evolution of global climate from the end of the Last Glacial Maximum approximately 19 ka to the early Holocene 11 ka presents an outstanding opportunity for understanding the transient response of Earth's climate system to external and internal forcings. During this interval of global warming, the decay of ice sheets caused global mean sea level to rise by approximately 80 m; terrestrial and marine ecosystems experienced large disturbances and range shifts; perturbations to the carbon cycle resulted in a net release of the greenhouse gases CO 2 and CH 4 to the atmosphere; and changes in atmosphere and ocean circulation affected the global distribution and fluxes of water and heat. Here we summarize a major effort by the paleoclimate research community to characterize these changes through the development of welldated, high-resolution records of the deep and intermediate ocean as well as surface climate. Our synthesis indicates that the superposition of two modes explains much of the variability in regional and global climate during the last deglaciation, with a strong association between the first mode and variations in greenhouse gases, and between the second mode and variations in the Atlantic meridional overturning circulation.

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Section: Resultsmentioning

confidence: 73%

Section: Resultsmentioning

confidence: 99%

Global climate evolution during the last deglaciation

Clark

Shakun

Baker

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

477

306

View full text Add to dashboard Cite

show abstract

“…The Chilean site 22 may be too close to the region of active AAIW formation to have been influenced by AAIW that acquired older carbon during its journey around Antarctica. Recent evidence of radiocarbon-depleted AAIW reported from the tropical South Atlantic off Brazil during the HS1 and YD intervals 24 and from the deep Southern Ocean 25 during the last glacial period is consistent with acquisition of old abyssal carbon east of Drake Passage.…”

Section: Aaiw With a Relatively Decreased Component Of Aaiw During Thementioning

confidence: 92%

Southern Ocean source of 14C-depleted carbon in the North Pacific Ocean during the last deglaciation

et al. 2010

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“…North of the Straits of Florida the Florida Current forms 90 % of the Gulf Stream, passing north along the margins of South Carolina and Georgia, from where also large CWC provinces have been reported (Ross, 2007;Ross and Quattrini, 2007;Messing et al, 2008). South of the Campeche CWC province, Lophelia is known from off Brazil, Venezuela and Colombia and was recently mapped off Roatan, Honduras (Reyes et al, 2005;Lutz and Ginsburg, 2007;Arantes et al, 2009;Mangini et al, 2010;Etnoyer et al, 2011), thus following the path of the northward-flowing AAIW that bypasses the Campeche Bank (Merino, 1997). Such an oceanic intermediate water gateway (sensu Henry, 2011) may exert strong control on coral larval dispersal routes as has been documented for Desmophyllum dianthus populations in the South Pacific (Miller et al, 2011).…”

Section: Hebbeln Et Al: Environmental Forcing Of the Campeche Colmentioning

confidence: 99%

Environmental forcing of the Campeche cold-water coral province, southern Gulf of Mexico

et al. 2014

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Abstract.With an extension of > 40 km 2 the recently discovered Campeche cold-water coral province located at the northeastern rim of the Campeche Bank in the southern Gulf of Mexico belongs to the largest coherent cold-water coral areas discovered so far. The Campeche province consists of numerous 20-40 m-high elongated coral mounds that are developed in intermediate water depths of 500 to 600 m. The mounds are colonized by a vivid cold-water coral ecosystem that covers the upper flanks and summits. The rich coral community is dominated by the framework-building Scleractinia Enallopsammia profunda and Lophelia pertusa, while the associated benthic megafauna shows a rather scarce occurrence. The recent environmental setting is characterized by a high surface water production caused by a local upwelling center and a dynamic bottom-water regime comprising vigorous bottom currents, obvious temporal variability, and strong density contrasts, which all together provide optimal conditions for the growth of cold-water corals. This setting -potentially supported by the diel vertical migration of zooplankton in the Campeche area -controls the delivering of food particles to the corals. The Campeche cold-water coral province is, thus, an excellent example highlighting the importance of the oceanographic setting in securing the food supply for the development of large and vivid cold-water coral ecosystems.

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Deep sea corals off Brazil verify a poorly ventilated Southern Pacific Ocean during H2, H1 and the Younger Dryas

Cited by 68 publications

References 45 publications

Global climate evolution during the last deglaciation

Global climate evolution during the last deglaciation

Southern Ocean source of 14C-depleted carbon in the North Pacific Ocean during the last deglaciation

Environmental forcing of the Campeche cold-water coral province, southern Gulf of Mexico

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