Hydroclimate change in subtropical South Africa during the mid-Piacenzian Warm Period
International audience The mid-Piacenzian Warm Period (mPWP, 3.264–3.025 Ma) of the Pliocene epoch has been proposed as an analog for future climate scenarios. Disagreement between the paleoenvironmental reconstruction and model simulations of the climate in subtropical regions for this period sugge...
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ftinsu:oai:HAL:hal-02989245v1 2023-06-18T03:37:09+02:00 Hydroclimate change in subtropical South Africa during the mid-Piacenzian Warm Period Zhao, Xueqin Koutsodendris, Andreas Caley, Thibaut Dupont, Lydie Environnements et Paléoenvironnements OCéaniques (EPOC) Observatoire aquitain des sciences de l'univers (OASU) Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École Pratique des Hautes Études (EPHE) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) 2020 https://hal.science/hal-02989245 https://hal.science/hal-02989245/document https://hal.science/hal-02989245/file/Manuscript%20Zhao%20et%20al.-2020.pdf https://doi.org/10.1016/j.quascirev.2020.106643 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.quascirev.2020.106643 hal-02989245 https://hal.science/hal-02989245 https://hal.science/hal-02989245/document https://hal.science/hal-02989245/file/Manuscript%20Zhao%20et%20al.-2020.pdf doi:10.1016/j.quascirev.2020.106643 info:eu-repo/semantics/OpenAccess ISSN: 0277-3791 Quaternary Science Reviews https://hal.science/hal-02989245 Quaternary Science Reviews, 2020, 249, pp.106643. ⟨10.1016/j.quascirev.2020.106643⟩ Vegetation hydroclimate mid-Piacenzian Warm Period IODP Site U1479 South Africa [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology info:eu-repo/semantics/article Journal articles 2020 ftinsu https://doi.org/10.1016/j.quascirev.2020.106643 2023-06-05T22:29:46Z International audience The mid-Piacenzian Warm Period (mPWP, 3.264–3.025 Ma) of the Pliocene epoch has been proposed as an analog for future climate scenarios. Disagreement between the paleoenvironmental reconstruction and model simulations of the climate in subtropical regions for this period suggests that more investigation of the subtropical climate variability of the mPWP is needed. This study presents pollen, microcharcoal and benthic foraminifera oxygen isotope records generated from marine sediment cores of International Ocean Discovery Program (IODP) Exp. 361 Site U1479 from the Cape Basin offshore of South Africa for the period between 3.337 and 2.875 Ma. With an average sample resolution of 3 ka, this record represents the highest-resolution record of mPWP vegetation change from the region. Our results indicate that the vegetation during the mPWP was dominated by fynbos (species-rich heathy vegetation in the Cape Floristic Region) with variable proportions of Ericaceae. Moreover, the development of the Afrotemperate forest (tall, multilayered indigenous forests in South Africa) reflects shifts in the amounts of precipitation between winter and summer in the year-round rainfall zone. The vegetation variation is probably influenced by the latitudinal insolation gradient in response to precession forcing. Several glacials depicted by the benthic foraminifera oxygen isotope record were characterized by lower percentage values of Restionaceae, higher percentage values of ericoid fynbos and Afrotemperate forest. These events correspond well with cooler SE Atlantic sea surface temperatures driven by interactions of both atmospheric and oceanographic processes. The cooler sea surface temperatures attributed to Antarctic ice sheet expansion, reduced Agulhas leakage (heat and salt transfer from the Indian Ocean to the Atlantic Ocean) and/or intensified southern Benguela upwelling, resulted in less precipitation in the winter rainfall zone of South Africa. Article in Journal/Newspaper Antarc* Antarctic Ice Sheet Institut national des sciences de l'Univers: HAL-INSU Antarctic Indian Quaternary Science Reviews 249 106643 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
Vegetation hydroclimate mid-Piacenzian Warm Period IODP Site U1479 South Africa [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
spellingShingle |
Vegetation hydroclimate mid-Piacenzian Warm Period IODP Site U1479 South Africa [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology Zhao, Xueqin Koutsodendris, Andreas Caley, Thibaut Dupont, Lydie Hydroclimate change in subtropical South Africa during the mid-Piacenzian Warm Period |
topic_facet |
Vegetation hydroclimate mid-Piacenzian Warm Period IODP Site U1479 South Africa [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
description |
International audience The mid-Piacenzian Warm Period (mPWP, 3.264–3.025 Ma) of the Pliocene epoch has been proposed as an analog for future climate scenarios. Disagreement between the paleoenvironmental reconstruction and model simulations of the climate in subtropical regions for this period suggests that more investigation of the subtropical climate variability of the mPWP is needed. This study presents pollen, microcharcoal and benthic foraminifera oxygen isotope records generated from marine sediment cores of International Ocean Discovery Program (IODP) Exp. 361 Site U1479 from the Cape Basin offshore of South Africa for the period between 3.337 and 2.875 Ma. With an average sample resolution of 3 ka, this record represents the highest-resolution record of mPWP vegetation change from the region. Our results indicate that the vegetation during the mPWP was dominated by fynbos (species-rich heathy vegetation in the Cape Floristic Region) with variable proportions of Ericaceae. Moreover, the development of the Afrotemperate forest (tall, multilayered indigenous forests in South Africa) reflects shifts in the amounts of precipitation between winter and summer in the year-round rainfall zone. The vegetation variation is probably influenced by the latitudinal insolation gradient in response to precession forcing. Several glacials depicted by the benthic foraminifera oxygen isotope record were characterized by lower percentage values of Restionaceae, higher percentage values of ericoid fynbos and Afrotemperate forest. These events correspond well with cooler SE Atlantic sea surface temperatures driven by interactions of both atmospheric and oceanographic processes. The cooler sea surface temperatures attributed to Antarctic ice sheet expansion, reduced Agulhas leakage (heat and salt transfer from the Indian Ocean to the Atlantic Ocean) and/or intensified southern Benguela upwelling, resulted in less precipitation in the winter rainfall zone of South Africa. |
author2 |
Environnements et Paléoenvironnements OCéaniques (EPOC) Observatoire aquitain des sciences de l'univers (OASU) Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École Pratique des Hautes Études (EPHE) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Zhao, Xueqin Koutsodendris, Andreas Caley, Thibaut Dupont, Lydie |
author_facet |
Zhao, Xueqin Koutsodendris, Andreas Caley, Thibaut Dupont, Lydie |
author_sort |
Zhao, Xueqin |
title |
Hydroclimate change in subtropical South Africa during the mid-Piacenzian Warm Period |
title_short |
Hydroclimate change in subtropical South Africa during the mid-Piacenzian Warm Period |
title_full |
Hydroclimate change in subtropical South Africa during the mid-Piacenzian Warm Period |
title_fullStr |
Hydroclimate change in subtropical South Africa during the mid-Piacenzian Warm Period |
title_full_unstemmed |
Hydroclimate change in subtropical South Africa during the mid-Piacenzian Warm Period |
title_sort |
hydroclimate change in subtropical south africa during the mid-piacenzian warm period |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://hal.science/hal-02989245 https://hal.science/hal-02989245/document https://hal.science/hal-02989245/file/Manuscript%20Zhao%20et%20al.-2020.pdf https://doi.org/10.1016/j.quascirev.2020.106643 |
geographic |
Antarctic Indian |
geographic_facet |
Antarctic Indian |
genre |
Antarc* Antarctic Ice Sheet |
genre_facet |
Antarc* Antarctic Ice Sheet |
op_source |
ISSN: 0277-3791 Quaternary Science Reviews https://hal.science/hal-02989245 Quaternary Science Reviews, 2020, 249, pp.106643. ⟨10.1016/j.quascirev.2020.106643⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.quascirev.2020.106643 hal-02989245 https://hal.science/hal-02989245 https://hal.science/hal-02989245/document https://hal.science/hal-02989245/file/Manuscript%20Zhao%20et%20al.-2020.pdf doi:10.1016/j.quascirev.2020.106643 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1016/j.quascirev.2020.106643 |
container_title |
Quaternary Science Reviews |
container_volume |
249 |
container_start_page |
106643 |
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1769010056548843520 |