Variations in Western Pacific Warm Pool surface and thermocline conditions over the past 110,000 years: Forcing mechanisms and implications for the glacial Walker circulation
International audience Surface and thermocline conditions of the Western Pacific Warm Pool (WPWP) reflect changes in regional and basin scale ocean and atmosphere circulations and in turn may affect climate globally. Previous studies suggest that a range of factors influences the WPWP on different t...
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ftinsu:oai:HAL:hal-02091063v1 2023-12-17T10:48:59+01:00 Variations in Western Pacific Warm Pool surface and thermocline conditions over the past 110,000 years: Forcing mechanisms and implications for the glacial Walker circulation Hollstein, Martina Mohtadi, Mahyar Rosenthal, Yair Prange, Matthias Oppo, Delia, W Martínez Méndez, Gema Kazuyo, Tachikawa Moffa Sanchez, Paola Steinke, Stephan Hebbeln, Dierk Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE) Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) 2018-12 https://hal.science/hal-02091063 https://doi.org/10.1016/j.quascirev.2018.10.030 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.quascirev.2018.10.030 hal-02091063 https://hal.science/hal-02091063 doi:10.1016/j.quascirev.2018.10.030 PRODINRA: 468107 WOS: 000452934700026 ISSN: 0277-3791 Quaternary Science Reviews https://hal.science/hal-02091063 Quaternary Science Reviews, 2018, 201, pp.429-445. ⟨10.1016/j.quascirev.2018.10.030⟩ intertropical convergence zone planktonic-foraminifera el-nino climate variability cleaning procedures sea temperature tropical pacific isotopic composition la-nina [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2018 ftinsu https://doi.org/10.1016/j.quascirev.2018.10.030 2023-11-22T17:45:40Z International audience Surface and thermocline conditions of the Western Pacific Warm Pool (WPWP) reflect changes in regional and basin scale ocean and atmosphere circulations and in turn may affect climate globally. Previous studies suggest that a range of factors influences the WPWP on different timescales, however the precise forcings and mechanisms are unclear. Combining surface and thermocline records from sediment cores offshore Papua New Guinea we explore the influence of local and remote processes on the WPWP in response to astronomical forcing and changing glacial-interglacial boundary conditions over the past 110 kyr. We find that thermocline temperatures change with variations in Earth's obliquity with higher temperatures coinciding with high obliquity, which is attributed to variations in subduction and advection of the South Pacific Tropical Water. In contrast, rainfall variations associated with meridional migrations of the Intertropical Convergence Zone are primarily driven by changes in insolation due to precession. Records of bulk sedimentary Ti/Ca and foraminiferal Nd/Ca indicate an additional influence of obliquity, which, however, cannot unambiguously be related to changes in precipitation. Finally, our results suggest a thermocline deepening during the Last Glacial Maximum (LGM). A compilation of available proxy records illustrates a dipole-like pattern of LGM thermocline depth anomalies with a shoaling (deepening) in the northern (southern) WPWP. A comparison of the proxy compilation with an ensemble of Paleoclimate Model Intercomparison Project (PMIP) climate model simulations reveals that the spatial pattern of LGM thermocline depth anomalies is mainly attributable to a contraction of the Pacific Walker circulation on its western side. Article in Journal/Newspaper Planktonic foraminifera Institut national des sciences de l'Univers: HAL-INSU Pacific Quaternary Science Reviews 201 429 445 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
intertropical convergence zone planktonic-foraminifera el-nino climate variability cleaning procedures sea temperature tropical pacific isotopic composition la-nina [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
intertropical convergence zone planktonic-foraminifera el-nino climate variability cleaning procedures sea temperature tropical pacific isotopic composition la-nina [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Hollstein, Martina Mohtadi, Mahyar Rosenthal, Yair Prange, Matthias Oppo, Delia, W Martínez Méndez, Gema Kazuyo, Tachikawa Moffa Sanchez, Paola Steinke, Stephan Hebbeln, Dierk Variations in Western Pacific Warm Pool surface and thermocline conditions over the past 110,000 years: Forcing mechanisms and implications for the glacial Walker circulation |
topic_facet |
intertropical convergence zone planktonic-foraminifera el-nino climate variability cleaning procedures sea temperature tropical pacific isotopic composition la-nina [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience Surface and thermocline conditions of the Western Pacific Warm Pool (WPWP) reflect changes in regional and basin scale ocean and atmosphere circulations and in turn may affect climate globally. Previous studies suggest that a range of factors influences the WPWP on different timescales, however the precise forcings and mechanisms are unclear. Combining surface and thermocline records from sediment cores offshore Papua New Guinea we explore the influence of local and remote processes on the WPWP in response to astronomical forcing and changing glacial-interglacial boundary conditions over the past 110 kyr. We find that thermocline temperatures change with variations in Earth's obliquity with higher temperatures coinciding with high obliquity, which is attributed to variations in subduction and advection of the South Pacific Tropical Water. In contrast, rainfall variations associated with meridional migrations of the Intertropical Convergence Zone are primarily driven by changes in insolation due to precession. Records of bulk sedimentary Ti/Ca and foraminiferal Nd/Ca indicate an additional influence of obliquity, which, however, cannot unambiguously be related to changes in precipitation. Finally, our results suggest a thermocline deepening during the Last Glacial Maximum (LGM). A compilation of available proxy records illustrates a dipole-like pattern of LGM thermocline depth anomalies with a shoaling (deepening) in the northern (southern) WPWP. A comparison of the proxy compilation with an ensemble of Paleoclimate Model Intercomparison Project (PMIP) climate model simulations reveals that the spatial pattern of LGM thermocline depth anomalies is mainly attributable to a contraction of the Pacific Walker circulation on its western side. |
author2 |
Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE) Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Hollstein, Martina Mohtadi, Mahyar Rosenthal, Yair Prange, Matthias Oppo, Delia, W Martínez Méndez, Gema Kazuyo, Tachikawa Moffa Sanchez, Paola Steinke, Stephan Hebbeln, Dierk |
author_facet |
Hollstein, Martina Mohtadi, Mahyar Rosenthal, Yair Prange, Matthias Oppo, Delia, W Martínez Méndez, Gema Kazuyo, Tachikawa Moffa Sanchez, Paola Steinke, Stephan Hebbeln, Dierk |
author_sort |
Hollstein, Martina |
title |
Variations in Western Pacific Warm Pool surface and thermocline conditions over the past 110,000 years: Forcing mechanisms and implications for the glacial Walker circulation |
title_short |
Variations in Western Pacific Warm Pool surface and thermocline conditions over the past 110,000 years: Forcing mechanisms and implications for the glacial Walker circulation |
title_full |
Variations in Western Pacific Warm Pool surface and thermocline conditions over the past 110,000 years: Forcing mechanisms and implications for the glacial Walker circulation |
title_fullStr |
Variations in Western Pacific Warm Pool surface and thermocline conditions over the past 110,000 years: Forcing mechanisms and implications for the glacial Walker circulation |
title_full_unstemmed |
Variations in Western Pacific Warm Pool surface and thermocline conditions over the past 110,000 years: Forcing mechanisms and implications for the glacial Walker circulation |
title_sort |
variations in western pacific warm pool surface and thermocline conditions over the past 110,000 years: forcing mechanisms and implications for the glacial walker circulation |
publisher |
HAL CCSD |
publishDate |
2018 |
url |
https://hal.science/hal-02091063 https://doi.org/10.1016/j.quascirev.2018.10.030 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_source |
ISSN: 0277-3791 Quaternary Science Reviews https://hal.science/hal-02091063 Quaternary Science Reviews, 2018, 201, pp.429-445. ⟨10.1016/j.quascirev.2018.10.030⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.quascirev.2018.10.030 hal-02091063 https://hal.science/hal-02091063 doi:10.1016/j.quascirev.2018.10.030 PRODINRA: 468107 WOS: 000452934700026 |
op_doi |
https://doi.org/10.1016/j.quascirev.2018.10.030 |
container_title |
Quaternary Science Reviews |
container_volume |
201 |
container_start_page |
429 |
op_container_end_page |
445 |
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1785573320626798592 |