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- W8723326 abstract "Abstract Since 900,000 years the 100- and 41-kyr cycles of the ice volume dominate most of the climatic parameters. Exception occurs in the tropics, where some records exhibit stronger precession cycles. Primary productivity is one of these parameters. Late pleistocene quantitative changes in nannoplankton communities preserved in eight deep-sea cores are used to monitor primary productivity along the equator in the Indian and Pacific oceans. The precession-controlled changes, significantly present in these cores, are discussed here in detail. Primary production (PP) is highest during high precession times in most of the records, and during low precession time in the western Pacific warm pool (WPWP). The opposite response of the WPWP corresponds to the rocking of the east–west thermocline slope of the Indo-Pacific that strongly affects PP. These balance movements of the thermocline slope are linked to processes similar to the southern oscillation phenomenon but on a longer time scale and are labelled ENSO-like. The precession-induced ENSO-like variability precedes changes in the oxygen isotopic ratio, which indicates that it is not the result of ice sheet fluctuations. On the reverse, because deglaciations occur during the transition caused by the onset of El Nino-like phases that produce great transport of heat to the high latitudes, ENSO-like variability could be at the origin of late pleistocene deglaciations. The stack of all these PP records shows that the glacial PP was 50% (3.5 Giga ton of carbon) higher than the interglacials in the equatorial Indo-Pacific ocean." @default.
- W8723326 created "2016-06-24" @default.
- W8723326 creator A5080523296 @default.
- W8723326 date "2007-01-01" @default.
- W8723326 modified "2023-09-25" @default.
- W8723326 title "Chapter 12 Precession and ENSO-Like Variability in the Equatorial Indo-Pacific Ocean" @default.
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- W8723326 doi "https://doi.org/10.1016/s0422-9894(06)73012-4" @default.
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