Journal ArticleDOI
Deepwater source variations during the last climatic cycle and their impact on the global deepwater circulation
J.-C. Duplessy,N.J. Shackleton,Richard G. Fairbanks,Laurent Labeyrie,Delia W Oppo,Nejib Kallel +5 more
TLDR
In this paper, a detailed reconstruction of the geographic distribution of ∂13C in benthic foraminifera in the Atlantic Ocean during the last glacial maximum was presented.Abstract:
The degree of similarity of the ∂13C records of the planktonic foraminiferal species N. pachyderma and of the benthic foraminiferal genus Cibicides in the high-latitude basins of the world ocean is used as an indicator of the presence of deepwater sources during the last climatic cycle. Whereas continuous formation of deep water is recognized in the southern ocean, the Norwegian Sea stopped acting as a sink for surface water during isotope stage 4 and the remainder of the last glaciation. However, deep water formed in the north Atlantic south of the Norwegian Sea during the last climatic cycle as early as isotope substage 5d, and this area was also the only active northern source during stages 4–2. A detailed reconstruction of the geographic distribution of ∂13C in benthic foraminifera in the Atlantic Ocean during the last glacial maximum shows that the most important deepwater mass originated from the southern ocean, whereas the Glacial North Atlantic Deep Water cannot be traced south of 40°N. At shallower depth an oxygenated 13C rich Intermediate Water mass extended from 45°N to 15°S. In the Pacific Ocean a ventilation higher than the modern one was also found in open ocean in the depth range 700–2600 m and is best explained by stronger formation of Intermediate Water in high northern latitudes.read more
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Posted ContentDOI
Modelling ocean circulation, climate and oxygen isotopes in the ocean over the last 120 000 years
Robert Marsh,M. P. L. M. Smith,Eelco J. Rohling,Daniel J. Lunt,Timothy M. Lenton,Mark S. Williamson,Mark S. Williamson,Andrew Yool +7 more
TL;DR: In this article, a new Earth System Model of Intermediate Complexity (GENIE-1) is used to simulate the most recent glacial-interglacial cycle by prescribing orbital forcing, atmospheric CO2 concentration, and the time evolution of ice sheet extent and orography.
Journal ArticleDOI
Last glacial and meltwater interbasin water exchanges and sedimentation in the World Ocean
Dan Seidov,Bernd J. Haupt +1 more
TL;DR: In this paper, a combination of an ocean global circulation model and a sediment transport model is used to model changes of sediment deposition rates, linked to the changes of the global deep-ocean thermohaline circulation.
Journal ArticleDOI
Stable isotopic records of the glacial deep-water properties in the South China Sea
TL;DR: Based on the oxygen and carbon stable isotopic records of benthic foraminifera in nine deep-sea cores of the South China Sea (SCS), the bathymetric profiles of δ18O and δ13C since the last glacial maximum (LGM) are preliminarily established as discussed by the authors.
Journal ArticleDOI
Changements abrupts dans un monde glaciaire
TL;DR: Labeyrie et al. as mentioned in this paper proposed that the caracteristiques differentes des signaux of type Groenland and Antarctique result in the distribution respective des continents and des oceans dans les deux hemispheres and des retroactions sur la dynamique atmospherique and la circulation thermohaline.
Journal ArticleDOI
Glacial-to-deglacial changes in North Atlantic meltwater advection and deep-water formation – Centennial-to-millennial-scale 14C records from the Azores plateau
Sven Balmer,Michael Sarnthein +1 more
TL;DR: This paper employed the 14C plateau-tuning technique to a centennial-scale planktic 14C record of core MD08-3180 retrieved S.W. of the Azores Islands at ∼3060m water depth to establish both a new standard of absolute age control and a record of past 14C reservoir ages of ocean surface waters.
References
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Journal ArticleDOI
Smoothing and Differentiation of Data by Simplified Least Squares Procedures.
Journal ArticleDOI
The distribution of 13C of ΣCO2 in the world oceans
TL;DR: In this article, the results from 2252 samples from 107 hydrographic stations are presented as north-south vertical (depth) sections with δ13C contoured at intervals of 0.5−0.0075·AOU.
Journal ArticleDOI
North Atlantic thermohaline circulation during the past 20,000 years linked to high-latitude surface temperature
Edward A. Boyle,Lloyd D Keigwin +1 more
TL;DR: In this paper, the authors show that during a surface cooling event 10,000 to 12,000 years ago, higher Cd/Ca and lower 13C/12C ratios are observed in benthic foraminifera shells from rapidly accumulating western North Atlantic sediments.
Journal ArticleDOI
Comparison of Atlantic and Pacific paleochemical records for the last 215,000 years : changes in deep ocean circulation and chemical inventories
Edward A. Boyle,Lloyd D Keigwin +1 more
TL;DR: In this article, detailed Cd/Ca and δ 13 C data have been obtained for benthic foraminifera from western North Atlantic and Equatorial Pacific sediment cores, which indicate that bottom waters overlying the Atlantic site have been nutrient depleted relative to those at the Pacific site over the last 215,000 years.
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North Atlantic thermohaline circulation during the past 20,000 years linked to high-latitude surface temperature
Edward A. Boyle,Lloyd D Keigwin +1 more