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.
https://hal-insu.archives-ouvertes.fr/insu-02104911
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
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