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	Provedor de dados ArchiMer (4) Autor Arellano-torres, Elsa (1) Colin, Christophe (1) Ganeshram, Raja S. (1) Ikehara, Ken (1) Kennett, James P. (1) Liu, Zhifei (1) Ohkushi, Ken'Ichi (1) Pichevin, Laetitia E. (1) Salas-de-leon, David Alberto (1) Shackleton, Nicholas J. (1) Shibahara, Akihiko (1) Vautravers, Maryline J. (1) Wu, Qiong (1) Xie, Xin (1) Zhao, Yulong (1) Mais... Palavra-chave Last glacial (4) Benthic foraminifera (1) Biological production (1) Deglacial (1) Eastern tropical North Pacific (1) Grain-size analyses (1) Holocene (1) Millennial scale (1) Oyashio (1) Paleoceanography (1) Penultimate glacial (1) Planktonic foraminifera (1) SST (1) Southern South China Sea (1) Time series analyses (1) Turbidite (1) XRF Core Scanner (1) Mais... Tipo do documento Text (4) Ano 2015 (1) 2011 (1) 2007 (1) 2006 (1) País France (4) Idioma Inglês (4)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 4 Primeira ... 1 ... Última Persistent millennial scale climate variability in the Eastern Tropical North Pacific over the last two glacial cycles ArchiMer Arellano-torres, Elsa; Ganeshram, Raja S.; Pichevin, Laetitia E.; Salas-de-leon, David Alberto. High-resolution sediment records from the eastern tropical North Pacific (ETNP) spanning the last ~240 ka B.P. were studied to document the nature of millennial-scale climatic events in the tropical Pacific and to investigate teleconnection mechanisms. We present organic carbon (%OC) and diffuse spectral reflectivity records as indicative of upwelling and productivity changes off NW Mexico over the middle to late Pleistocene. The new productivity records document the persistence of abrupt millennial-scale changes over the last two glacial cycles. Detailed spectral and wavelet time series analyses show the predominance of longer climatic cycles (2–6 ka) during the last and the penultimate glacial periods. The persistence of millennial variability during the... Tipo: Text Palavras-chave: Millennial scale; Last glacial; Penultimate glacial; Time series analyses; Eastern tropical North Pacific. Ano: 2015 URL: https://archimer.ifremer.fr/doc/00270/38153/36272.pdf Turbidite deposition in the southern South China Sea during the last glacial: Evidence from grain-size and major elements records ArchiMer Zhao, Yulong; Liu, Zhifei; Colin, Christophe; Xie, Xin; Wu, Qiong. High-resolution grain size and major element geochemical measurements were performed on the marine sediments of Core MD05-2895 to help understand the formation of turbidite sequences. Grain-size results show that these turbidite sediments contain more coarse sediment grains than normal marls. The coarse sediment grains are mostly derived from relict sediments on the Sunda Shelf. Relict sediments are composed mainly of quartz, feldspar, tephra and a few titaniferous or ferruginous heavy minerals. Corresponding to the concentration of these minerals, increases in Si/Al, K/Al, Ti/Al and Fe/Al ratios are observed in the turbidite layers. As all the observed turbidite sequences were deposited during the last glacial, the occurrence of these turbidity events is... Tipo: Text Palavras-chave: Southern South China Sea; Last glacial; Turbidite; Grain-size analyses; XRF Core Scanner. Ano: 2011 URL: https://archimer.ifremer.fr/doc/00213/32464/30929.pdf Late Quaternary changes in intermediate water oxygenation and oxygen minimum zone, northern Japan: A benthic foraminiferal perspective ArchiMer Shibahara, Akihiko; Ohkushi, Ken'Ichi; Kennett, James P.; Ikehara, Ken. A strong oxygen minimum zone (OMZ) currently exists at upper intermediate water depths on the northern Japanese margin, NW Pacific. The OMZ results largely from a combination of high surface water productivity and poor ventilation of upper intermediate waters. We investigated late Quaternary history ( last 34 kyr) of ocean floor oxygenation and the OMZ using quantitative changes in benthic foraminiferal assemblages in three sediment cores taken from the continental slope off Shimokita Peninsula and Tokachi, northern Japan, at water depths between 975 and 1363 m. These cores are well located within the present-day OMZ, a region of high surface water productivity, and in close proximity to the source region of North Pacific Intermediate Water. Late... Tipo: Text Palavras-chave: Benthic foraminifera; Paleoceanography; Oyashio; Biological production; Last glacial; Deglacial; Holocene. Ano: 2007 URL: https://archimer.ifremer.fr/doc/00236/34733/33182.pdf Centennial-scale surface hydrology off Portugal during marine isotope stage 3: Insights from planktonic foraminiferal fauna variability ArchiMer Vautravers, Maryline J.; Shackleton, Nicholas J.. The marine isotopic stage 3 (MIS3) at Ocean Drilling Program (ODP) Site 1060 (Gulf Stream) shows both sharp onset and end of interstadials, the existence of very short lived warm events during stadials, and points to differences in detail between the sea surface temperature (SST) record from the western North Atlantic and the atmospheric temperature record inferred from delta O-18 in Greenland ice. Investigating MIS3 and obtaining comparable data from other locations appears crucial. The eastern Atlantic provides well-documented records of climate changes. We have selected a core from off Portugal and use it to examine Dansgaard/Oeschger events (D/O) at centennial-scale resolution (139 years on average between two data points). We have obtained a faunal... Tipo: Text Palavras-chave: SST; Planktonic foraminifera; Last glacial. Ano: 2006 URL: https://archimer.ifremer.fr/doc/00234/34548/33352.pdf Registros recuperados: 4 Primeira ... 1 ... Última

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