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| Cheshire, Heather; Thurow, Juergen. |
| Guaymas Basin, Gulf of California, is a restricted basin located under the present-day wet/dry subtropical divide (similar to 27 degrees N) and is ideally circumstanced for detecting variations in the North Pacific Subtropical High (NPSH)/Trade Wind system. Controlled by climate cell boundary displacement, NPSH midwinter location was the primary influence on timing and intensity of upwelling seasons in Guaymas Basin. Analysis of high-resolution X-ray fluoresence data and sediment fabric log from 75% laminated Core MD02-2517/2515, western Guaymas Basin, reveals systematic changes in NPSH behavior over the last similar to 55 kyr BP. Southward displacement of the wet/dry subtropical divide controlled upwelling-related diatom productivity, while sea level and... |
| Tipo: Text |
Palavras-chave: Quaternary; Paleoceanography; X-ray fluorescence; Laminated sediment. |
| Ano: 2013 |
URL: https://archimer.ifremer.fr/doc/00264/37527/35762.pdf |
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| Fraser, Nicholas; Kuhnt, Wolfgang; Holbourn, Ann; Bolliet, Timothe; Andersen, Nils; Blanz, Thomas; Beaufort, Luc. |
| Proxy records of hydrologic variability in the West Pacific Warm Pool (WPWP) have revealed wide-scale changes in past convective activity in response to orbital and suborbital climate forcings. However, attributing proxy responses to regional changes in WPWP hydrology versus local variations in precipitation requires independent records linking the terrestrial and marine realms. We present high-resolution stable isotope, U-37(K) sea surface temperature, X-ray fluorescence (XRF) core scanning, and coccolithophore-derived paleoproductivity records covering the past 120ka from International Marine Global Change (IMAGES) Program Core MD06-3075 (6 degrees 29N, 125 degrees 50E, water depth 1878m), situated in the Davao Gulf on the southern side of Mindanao.... |
| Tipo: Text |
Palavras-chave: Intertropical Convergence Zone; West Pacific Warm Pool; Walker circulation; Seawater 18O; X-ray fluorescence. |
| Ano: 2014 |
URL: https://archimer.ifremer.fr/doc/00289/40057/39357.pdf |
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| Simabuco,S.M.; Nascimento Filho,V.F.. |
| The distribution of S, Cl, K and Ca along the profiles of two soils of different texture (Red Yellow Podzolic and Dark Red Latosol) treated with amounts of vinasse equivalent to 4000 m³/ha were studied using energy dispersive X-ray fluorescence, observing a significant increase in the contents of these elements. The same effect was observed for Cu, Zn, Rb and Sr contents in soils treated with vinasse as compared to the control. The concentrations of Al, Si, Ti, Mn, Fe and Zr could also be evaluated but no significant variation was observed due to the high soil initial concentrations of these elements as compared to the low concentrations in the vinasse. Annular radioactive sources of Fe-55 and Cd-109 were employed for the excitation of these elements in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: X-ray fluorescence; Energy dispersive; Radioisotopic excitation; Vinasse. |
| Ano: 1994 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000200002 |
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