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| Gingele, Fx; Schmieder, F; Von Dobeneck, T; Petschick, R; Ruhlemann, C. |
| Surface sediment samples and three gravity cores from the eastern terrace of the Vema Channel, the western flank of the Rio Grande Rise, and the Brazilian continental slope were investigated for physical properties, grain size, and clay mineral composition. Discharge of the Rio Doce is responsible for kaolinite enrichments on the slope south of 20 degrees and at intermediate depths of the Rio Grande Rise. The long-distance advection of kaolinite with North Atlantic Deep Water from lower latitudes is of minor importance as evidenced by low kaolinite/chlorite ratios on the Mid-Atlantic Ridge. Cyclic variations of kaolinite/chlorite ratios in all our cores, with maxima in interglacials, are attributed to low- and high-latitude forcing of paleoclimate on the... |
| Tipo: Text |
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| Ano: 1999 |
URL: https://archimer.ifremer.fr/doc/00240/35077/34547.pdf |
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| Conte, Mh; Sicre, Ma; Ruhlemann, C; Weber, Jc; Schulte, S; Schulz-bull, D; Blanz, T. |
| [1] In this paper, we compile the current surface seawater C(37) alkenone unsaturation (U(37)(K')) measurements ( n = 629, - 1 to 30 degrees C temperature range) to derive a global, field-based calibration of U(37)(K') with alkenone production temperature. A single nonlinear "global'' surface water calibration of U(37)(K') accurately predicts alkenone production temperatures over the diversity of modern-day oceanic environments and alkenone-synthesizing populations (T = - 0.957 + 54.293(U(37)(K')) - 52.894(U(37)(K'))(2) + 28.321(U(37)(K'))(3), r(2) = 0.97, n = 567). The mean standard error of estimation is 1.2 degrees C with insignificant bias in estimated production temperature among the different ocean regions sampled. An exception to these trends is... |
| Tipo: Text |
Palavras-chave: Alkenones; Paleoproxies; Sea surface temperature; UK ' 37. |
| Ano: 2006 |
URL: https://archimer.ifremer.fr/doc/00239/34978/33474.pdf |
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