Pluvial periods in Southern Arabia over the last 1.1 million-years

Nicholson, Samuel L.; Pike, Alistair W.G.; Hosfield, Rob; Roberts, Nick; Sahy, Diana; Woodhead, Jon; Cheng, Hai; Edwards, R. Lawrence; Affolter, Stéphane; Leuenberger, Markus; Burns, Stephen J.; Matter, Albert; Fleitmann, Dominik (2020). Pluvial periods in Southern Arabia over the last 1.1 million-years. Quaternary science reviews, 229, p. 106112. Elsevier 10.1016/j.quascirev.2019.106112

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Past climates and environments experienced by the Saharo-Arabian desert belt are of prime importance for palaeoclimatic and palaeoanthropological research. On orbital timescales transformations of the desert into a grassland landscape in response to higher precipitation provided “windows of opportunity” for hominin dispersal from Africa into Eurasia. On long timescales, palaeoenvironmental reconstructions for the region are predominantly derived from marine sediments and available terrestrial records from the Arabian Peninsula are limited to 450 ka before present (BP). Here, we present a new stalagmite-based palaeoclimate record from Mukalla Cave in Yemen which extends back to ∼1.1 million years BP or Marine Isotope Stage (MIS) 31, as determined by Uranium-lead dating. Stalagmite Y99 grew only during peak interglacial periods and warm substages back to ∼1.1 Ma. Stalagmite calcite oxygen isotope (δ18O) values show that every past interglacial humid period was wetter than the Holocene, a period in which large lakes formed in the now arid areas of southern Arabia. Carbon isotope (δ13C) values indicate habitable grassland environments developed during these pluvial periods. A total of 21 pluvial periods with precipitation of more than 300 mm yr−1 occurred since ∼1.1 Ma and thus numerous opportunities for hominin dispersals occurred throughout the Pleistocene. New determinations of hydrogen (δDFI) and oxygen (δ18OFI) isotopes in stalagmite fluid inclusion water demonstrates that enhanced precipitation in Southern Arabia was brought by the African and Indian Summer Monsoons. When combined with sub-annual calcite analysis of δ18O and δ13C, these data reveal a distinct wet (summer) and dry (winter) seasonality.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geological Sciences
08 Faculty of Science > Physics Institute > Climate and Environmental Physics

UniBE Contributor:

Affolter, Stéphane; Leuenberger, Markus and Matter, Albert

Subjects:

500 Science > 550 Earth sciences & geology
500 Science > 530 Physics

ISSN:

0277-3791

Publisher:

Elsevier

Language:

English

Submitter:

BORIS Import 2

Date Deposited:

20 Sep 2021 09:24

Last Modified:

26 Sep 2021 03:07

Publisher DOI:

10.1016/j.quascirev.2019.106112

BORIS DOI:

10.48350/158632

URI:

https://boris.unibe.ch/id/eprint/158632

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