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VARIATIONS TEMPORELLES DES CHANGEMENTS HYDROLOGIQUES DANS LA ZONE DU PACIFIQUE EST. APPROCHES GEOCHIMIQUES, ISOTOPIQUES ET MICROPALEONTOLOGIQUES.

Abstract : The objective of this thesis is to examine the modes of climatic connections between the low and high latitudes associated with rapid climatic variability of the last glacial period. This study is based on geochemical analysis of two marine sediment cores retrieved in the Eastern tropical Pacific. Eastern Equatorial Pacific sea surface salinities are estimated by combining δ18O measurements performed on planktonic foraminifera and paleothermometers. The regional salinity variations respond to latitudinal migrations of atmospheric convection zones, allowing to track atmospheric moisture transport from the Atlantic to the Pacific. Stable isotopes measured on benthic foraminifera coupled to organic geochemistry measurements permit to interpret these records in terms of intermediate water oceanic circulation, and to deduce modes of oceanic ventilation within the Pacific.
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https://tel.archives-ouvertes.fr/tel-00216197
Contributor : Guillaume Leduc <>
Submitted on : Thursday, January 24, 2008 - 5:34:18 PM
Last modification on : Tuesday, February 2, 2021 - 3:10:04 PM
Long-term archiving on: : Friday, November 25, 2016 - 8:37:00 PM

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  • HAL Id : tel-00216197, version 1

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Guillaume Leduc. VARIATIONS TEMPORELLES DES CHANGEMENTS HYDROLOGIQUES DANS LA ZONE DU PACIFIQUE EST. APPROCHES GEOCHIMIQUES, ISOTOPIQUES ET MICROPALEONTOLOGIQUES.. Géochimie. Université de droit, d'économie et des sciences - Aix-Marseille III, 2007. Français. ⟨tel-00216197⟩

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