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HYDROGRAPH SEPARATION OF THE AMAZON RIVER USING 18O AS AN ISOTOPIC TRACER Scientia Agricola
MORTATTI,J.; MORAES,J.M.; RODRIGUES, JR,J.C.; VICTORIA,R.L.; MARTINELLI,L.A..
The 18O content of rain and river waters was used as an isotopic tracer in order to carry out the hydrograph separation of the Amazon river, during the 1973-1974 hydrological years, and to estimate the contributions of the surface runoff (event water) and baseflow (pre-event water) components to the total river flow. The average surface runoff and baseflow contributions were 30.3 and 69.7% respectively. At peak discharge, the mean contribution of the baseflow was about 57%. The results of the isotopic separation model were compared with the filter-separation autoregressive method, showing similar behavior and magnitude.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Isotopic tracers; Hydrograph separation; Amazon river.
Ano: 1997 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000200009
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Stable isotopes (C-13/C-12 and N-15/N-14) in settling organic matter of the northwestern Mediterranean Sea: biogeochemical implications ArchiMer
Kerherve, P; Minagawa, M; Heussner, S; Monaco, A.
Within the framework of the High Frequency Flux (HFF) experiment (MATER programme), time-series sediment traps have been deployed for two months on the continental slope off Marseilles to measure downward particle fluxes at a high frequency sampling rate (two and six days). Combined isotopic analyses of carbon and nitrogen have been performed on selected samples. Both isotopic tracers have been used for the first time on organic material of the Mediterranean Sea (Gulf of Lions) to determine the main biological sources and to address the biogeochemical processes that affected this material. Settling particles were characterised by very low values of delta N-15 (near 0 parts per thousand) and delta C-13 (near -24.5 parts per thousand) that indicate the...
Tipo: Text Palavras-chave: Isotopes stables; Traceurs isotopiques; Particules en sédimentation; Fixation d’azote; Golfe du Lion; Stable isotopes; Isotopic tracers; Settling particles; Nitrogen fixation; Gulf of Lions.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/00289/40019/38609.pdf
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