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	Provedor de dados ArchiMer (3) Autor Kawahata, H (3) Chang, Yp (1) Chen, Mt (1) Ishizuka, T (1) Murayama, M (1) Ohta, H (1) Wei, Ky (1) Wu, Sm (1) Yamamuro, M (1) Mais... Palavra-chave BIOGENIC SEDIMENTS (1) Calcium carbonate (1) Carbon cycle (1) Climate change (1) Cycle du carbone (1) DCAA (1) DFAA (1) East Asian monsoon (1) Flux de particules (1) IMAGES (1) INTERSTITIAL WATER (1) ODP (1) Okinawa Trough (1) Pacifique occidental (1) Paleoceanography (1) Seasonality (1) Sinking particle fluxes (1) THAA (1) Total organic carbon (1) Variation saisonnière (1) Mais... Tipo do documento Text (3) Ano 2005 (1) 1998 (1) 1993 (1) País France (3) Idioma Inglês (3)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 3 Primeira ... 1 ... Última Foraminiferal oxygen isotope stratigraphy and high-resolution organic carbon, carbonate records from the Okinawa Trough - (IMAGES MD012404 and ODP site 1202) ArchiMer Chang, Yp; Wu, Sm; Wei, Ky; Murayama, M; Kawahata, H; Chen, Mt. Biogenic carbonate and organic carbon content of two deep sea cores (MD012404 and ODP site 1202) are measured to reconstruct surface ocean productivity variations in areas of the Okinawa Trough in the Western Pacific where the modern climate is highly sensitive to the East Asian monsoon and precipitation/river runoff. Based on foraminiferal isotope stratigraphy and AMS C-14 dating, the age models of the cores indicate that core MD012404 shows relatively low sedimentation rates with 50 cm ky(-1) on average, and that the sedimentation rates in core ODP 1202 are extremely high with an average of 500 cm ky(-1). Total organic carbon (TOC) and carbonate contents in core ODP 1202 are 0.56% and 6.80% on average, respectively, and are 0.62% and 15.86%,... Tipo: Text Palavras-chave: IMAGES; ODP; Total organic carbon; Calcium carbonate; Okinawa Trough; Paleoceanography; Climate change; East Asian monsoon. Ano: 2005 URL: https://archimer.ifremer.fr/doc/00229/34064/32627.pdf Seasonal and vertical variations of sinking particle fluxes in the West Caroline Basin ArchiMer Kawahata, H; Yamamuro, M; Ohta, H. A sediment trap experiment was carried out in the West Caroline Basin, located in the equatorial western Pacific between influences of the Asian monsoon and the open ocean. Annual mass flux at the shallow trap at Site 1 was 57.10 g m(-2)yr(-1). Generally, the higher flux of organic matter was associated with higher activities of biogenic opal-producing and carbonate-producing plankton communities. In addition, as the organic matter content increases, the organic carbon/carbonate carbon ratio shows a tendency to increase. Carbonate-producing plankton was predominant during periods 1 and 3 (May to July and November to the beginning of December), which could be due to limited silica supply to the euphotic zone. On the other hand, surface sea water was more... Tipo: Text Palavras-chave: Variation saisonnière; Variation verticale; Flux de particules; Pacifique occidental; Cycle du carbone; Seasonality; Vertical variations; Sinking particle fluxes; Western Pacific; Carbon cycle. Ano: 1998 URL: http://archimer.ifremer.fr/doc/00325/43655/43219.pdf Amino-acids in the sediments and interstitial waters from odp hole-677b and hole-678b in the panama basin ArchiMer Kawahata, H; Ishizuka, T. Biogenic siliceous and calcareous sediments were drilled at sites 677 and 678 on the flank of Costa Rica Rift in the Panama basin. We analysed DCAA (dissolved combined amino acids) and DFAA (dissolved free amino acids) in the interstitial waters as well as THAA (total hydrolyzable amino acids) in the sediments in order to evaluate the relationship between THAA, DCAA and DFAA. Comparison of the THAA in the sediments and in marine settling particulate matter (Ittekkot et al., 1984 b) showed that the concentration of non-protein amino acids (e. g., beta-alanine, gamma-aminobutyric acid, and ornithine) was much higher in the sediments and that the neutral amino acid fraction was depleted in the sediments. These results, together with the organic carbon... Tipo: Text Palavras-chave: BIOGENIC SEDIMENTS; INTERSTITIAL WATER; THAA; DCAA; DFAA. Ano: 1993 URL: http://archimer.ifremer.fr/doc/00099/21062/18688.pdf Registros recuperados: 3 Primeira ... 1 ... Última

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