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Verfasst von:Taylor, Audrey K. [VerfasserIn]   i
 Berke, Melissa A. [VerfasserIn]   i
 Castañeda, Isla S. [VerfasserIn]   i
 Koutsodendris, Andreas [VerfasserIn]   i
 Campos, Hernan [VerfasserIn]   i
 Hall, Ian R. [VerfasserIn]   i
 Hemming, Sidney R. [VerfasserIn]   i
 LeVay, Leah J. [VerfasserIn]   i
 Sierra, Alejandra Cartagena [VerfasserIn]   i
 O'Connor, Keith [VerfasserIn]   i
Titel:Plio-pleistocene continental hydroclimate and indian ocean sea surface temperatures at the southeast african margin
Verf.angabe:Audrey K. Taylor, Melissa A. Berke, Isla S. Castañeda, Andreas Koutsodendris, Hernan Campos, Ian R. Hall, Sidney R. Hemming, Leah J. LeVay, Alejandra Cartagena Sierra, Keith O'Connor, and Expedition 361 Scientists
E-Jahr:2021
Jahr:08 February 2021
Umfang:18 S.
Teil:volume:36
 year:2021
 number:3
 month:03
 elocationid:e2020PA004186
 pages:1-18
 extent:18
Fussnoten:Gesehen am 18.05.2021
Titel Quelle:Enthalten in: Paleoceanography and paleoclimatology
Ort Quelle:Hoboken, NJ : Wiley, 2018
Jahr Quelle:2021
Band/Heft Quelle:36(2021), 3 vom: März, Artikel-ID e2020PA004186, Seite 1-18
ISSN Quelle:2572-4525
Abstract:Efforts to understand long-term Indian Ocean dynamics and land-sea linkages in southeast Africa during periods of significant global and regional climate change have been inhibited by a lack of high-resolution climate records, particularly during the Plio-Pleistocene. Here we present new biomarker and pollen records from International Ocean Discovery Program (IODP) Site U1478, located at the Upper Agulhas Confluence near the Limpopo River mouth, to establish environmental conditions at the southeast African margin between 4 and 1.8 Ma and address this spatiotemporal gap. Compound-specific hydrogen isotopes of terrestrial leaf waxes (δDwax) and TEX86, using marine archaeal lipids, document hydroclimate variability and sea surface temperature (SST), respectively, permitting an onshore-offshore climate comparison. The U1478 records establish the Limpopo catchment response to the switch in Indonesian Throughflow source waters, the mid-Pliocene Warm Period, and intensification of Northern Hemisphere glaciations at ∼2.7 Ma. Broad coherence between the δDwax and SST records supports a linkage between Indian Ocean temperatures and southeast African hydroclimate. We hypothesize that additional mechanisms including Indian Ocean cross-basin SST gradients (ΔSST) and high latitude glaciation acted as hydroclimate controls during the Plio-Pleistocene. We use ΔSST to evaluate ocean-atmosphere patterns similar to the Indian Ocean Dipole (IOD) and establish generally wetter conditions in the region associated with positive IOD-like phases. Additionally, an obliquity signal evident in the δDwax record indicates that glacial-interglacial variability likely influenced the tropical rain belt position and also controlled rainfall. Hydroclimate and environmental conditions across the Plio-Pleistocene in southeast Africa may have important implications for regional hominin evolution.
DOI:doi:10.1029/2020PA004186
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

Volltext ; Verlag: https://doi.org/https://doi.org/10.1029/2020PA004186
 Volltext: https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2020PA004186
 DOI: https://doi.org/10.1029/2020PA004186
Datenträger:Online-Ressource
Sprache:eng
Sach-SW:East Africa
 hydroclimate
 Indian Ocean
 organic geochemistry
 Plio-Pleistocene
 sea surface temperature
K10plus-PPN:1758042915
Verknüpfungen:→ Zeitschrift

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