HAL will be down for maintenance from Friday, June 10 at 4pm through Monday, June 13 at 9am. More information
Skip to Main content Skip to Navigation
Journal articles

Evolution of the zonal gradients across the equatorial Pacific during the Miocene–Pleistocene

Abstract : Combining Uk'37 -and TEX86-derived temperatures and oxygen isotopic values of mixed-layer and thermocline species from the IODP site U1338 (East Equatorial Pacific) and ODP Site 806 (West Equatorial Pacific) we assess the evolution of the zonal sea-surface temperature gradients and thermocline depth across the equatorial Pacific from the late Miocene through the Pleistocene. Data suggest a long-term shoaling of the thermocline along the equator throughout the Miocene-Pliocene that accelerated around 5.3 Ma. We identify a critical transition at about 3.8 Ma from a El-Niño-like-dominated mean state during the late Miocene and early Pliocene to a La-Niña-like-dominated state during the late Pliocene-Pleistocene. This transition coincides with the restriction of the Indonesian seaway and the onset of ice growth in the northern hemisphere and in Antarctica that led to the long-term strengthening of the Walker circulation and affected low-latitude zonal gradient.
Complete list of metadata

Contributor : Marie-Alexandrine Sicre Connect in order to contact the contributor
Submitted on : Saturday, November 13, 2021 - 3:49:06 PM
Last modification on : Monday, May 16, 2022 - 8:20:26 AM
Long-term archiving on: : Monday, February 14, 2022 - 6:40:54 PM



Catherine Beltran, Gabrielle Rousselle, Marc de Rafélis, Marie-Alexandrine Sicre, Nathalie Labourdette, et al.. Evolution of the zonal gradients across the equatorial Pacific during the Miocene–Pleistocene. Journal of Sedimentary Research, Society for Sedimentary Geology, 2019, 89 (3), pp.242-252. ⟨10.2110/jsr.2019.15⟩. ⟨insu-02104911⟩



Record views


Files downloads