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Changes in Deep Water Oxygenation of the South China Sea Since the Last Glacial Period 5
Li, Gang; Rashid, Harunur; Zhong, Lifeng; Xu, Xing; Yan, Wen; Chen, Zhong.
The Pacific meridional overturning circulation is thought to have a significant influence on global climate. However, the extent to which intermediate and deep circulations have changed in the Pacific Ocean since the Last Glacial Maximum (LGM) is not well known. At present, the South China Sea Deep Water (SCSDW) is fed by the upper Pacific Deep Water. Here we present new benthic foraminiferal C-13 and redox-sensitive elemental data from a sediment core retrieved from the southern deep SCS to reconstruct the oxygenation history of the SCSDW since the LGM. Oxygenation records from the deep SCS and intermediate and deep waters in the Pacific Ocean demonstrate that the SCSDW deeper than 1,600m has been sourced by the Pacific Deep Water since the LGM. Our data...
Tipo: Text Palavras-chave: Redox-sensitive element; Oxygenation; Pacific Deep Water; South China Sea Deep Water; North Pacific Intermediate Water; Last glacial period.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00497/60817/64615.pdf
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Contribution of seasonal sub-Antarctic surface water variability to millennial-scale changes in atmospheric CO2 over the last deglaciation and Marine Isotope Stage 3 5
Gottschalk, Julia; Skinner, Luke C.; Waelbroeck, Claire.
The Southern Ocean is thought to have played a key role in past atmospheric carbon dioxide (CO2,(atm)) changes. Three main factors are understood to control the Southern Ocean's influence on CO2,(atm), via their impact on surface ocean pCO(2) and therefore regional ocean-atmosphere CO2 fluxes: 1) the efficiency of air-sea gas exchange, which may be attenuated by seasonal- or annual sea-ice coverage or the development of a shallow pycnocline; 2) the supply of CO2-rich water masses from the subsurface and the deep ocean, which is associated with turbulent mixing and surface buoyancy- and/or wind forcing; and 3) biological carbon fixation, which depends on nutrient availability and is therefore influenced by dust deposition and/or upwelling. In order to...
Tipo: Text Palavras-chave: South Atlantic; Planktonic foraminifera; Stable oxygen and carbon isotopes; Atmospheric CO2; Last glacial period.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00297/40868/39920.pdf
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Terrestrial plant microfossils in palaeoenvironmental studies, pollen, microcharcoal and phytolith. Towards a comprehensive understanding of vegetation, fire and climate changes over the past one million years 5
Daniau, Anne-laure; Desprat, Stéphanie; Aleman, Julie C.; Bremond, Laurent; Davis, Basil; Fletcher, William; Marlon, Jennifer R.; Marquer, Laurent; Montade, Vincent; Morales-molino, César; Naughton, Filipa; Rius, Damien; Urrego, Dunia H..
The Earth has experienced large changes in global and regional climates over the past one million years. Understanding processes and feedbacks that control those past environmental changes is of great interest for better understanding the nature, direction and magnitude of current climate change, its effect on life, and on the physical, biological and chemical processes and ecosystem services important for human well-being. Microfossils from terrestrial plants – pollen, microcharcoal and phytoliths – preserved in terrestrial and marine sedimentary archives are particularly useful tools to document changes in vegetation, fire and land climate. They are well-preserved in a variety of depositional environments and provide quantitative reconstructions of past...
Tipo: Text Palavras-chave: Pollen; Microcharcoal; Phytolith; Terrestrial and marine sedimentary archives; Vegetation; Fire; Middle Pleistocene; Last glacial period; Holocene.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00485/59705/83610.pdf
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