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| Ollitrault, Michel; Gabillet, Céline; De Verdiere, Alain Colin. |
| As two fluid particles separate in time, the entire spectrum of eddy motions is being sampled from the smallest to the largest scales. In large-scale geophysical systems for which the Earth rotation is important, it has been conjectured that the relative diffusivity should vary respectively as D-2 and D-4/3 for distances respectively smaller and larger than a well-defined forcing scale of the order of the internal Rossby radius (with D the r.m.s. separation distance). Particle paths data from a mid-latitude float experiment in the central part of the North Atlantic appear to support these statements partly: two particles initially separated by a few km within two distinct clusters west and east of the mid-Atlantic ridge, statistically dispersed following a... |
| Tipo: Text |
Palavras-chave: Taylor dispersion; Dispersion; Atlantic circulation; Particule pairs. |
| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/2005/publication-456.pdf |
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| Roth, S; Reijmer, Jjg. |
| A marine sediment core from the leeward margin of Great Bahama Bank (GBB) was subjected to a multiproxy study. The aragonite dominated core MD992201 comprises the past 7230 years in a decadal time resolution and shows sedimentation rates of up to 13.8 m/kyr. Aragonite mass accumulation rates, age differences between planktonic foraminifera and aragonite sediments, and temperature distribution are used to deduce changes in aragonite production rates and paleocurrent strengths. Aragonite precipitation rates on GBB are controlled by exchange of carbonate ions and CO2 loss due to temperature-salinity conditions and biological activity, and these are dependent on the current strength. Paleocurrent strengths on GBB show high current velocities during the periods... |
| Tipo: Text |
Palavras-chave: Holocene climate; Great Bahama Bank; Atlantic circulation. |
| Ano: 2004 |
URL: https://archimer.ifremer.fr/doc/00229/33981/32331.pdf |
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