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Integrating cultural and biological perspectives on long-term human-walrus (Odobenus rosmarus rosmarus) interactions across the North Atlantic (2019)

Keighley, Xénia ; Tange Olsen, Morten ; Jordan, Peter

Cambridge University Press

In: Quaternary Research. 2019; 1-21. Published 2019 Mar 14. doi: 10.1017/qua.2018.150. [early online release]

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Publication Date: 2019-03-14

Print ISSN: 0033-5894

Electronic ISSN: 1096-0287

Topics: Geography , Geosciences

Published by Cambridge University Press

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A regional record of expanded Holocene wetlands and prehistoric human occupation from paleowetland deposits of the western Yarlung Tsangpo valley, southern Tibetan Plateau (2016)

Hudson, Adam M. ; Olsen, John W. ; Quade, Jay ; [et al.]

Cambridge University Press

In: Quaternary Research. 2016; 86(1): 13-33. Published 2016 Jul 01. doi: 10.1017/j.yqres.2016.04.001.

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Publication Date: 2016-07-01

Description: The Asian Monsoon, which brings ~80% of annual precipitation to much of the Tibetan Plateau, provides runoff to major rivers across the Asian continent. Paleoclimate records indicate summer insolation and North Atlantic paleotemperature changes forced variations in monsoon rainfall through the Holocene, resulting in hydrologic and ecologic changes in plateau watersheds. We present a record of Holocene hydrologic variability in the Yarlung Tsangpo (YT) valley of the southern Tibetan Plateau, based on sedimentology and 14C dating of organic-rich black mats’ in paleowetlands deposits, that shows changes in wetlands extent in response to changing monsoon intensity. Four sedimentary units indicate decreasing monsoon intensity since 10.4 ka BP. Wet conditions occurred at ~10.4 ka BP, ~9.6 ka BP and ~7.9–4.8 ka BP, with similar-to-modern conditions from ~4.6–2.0 ka BP, and drier-than-modern conditions from ~2.0 ka BP to present. Wetland changes correlate with monsoon intensity changes identified in nearby records, with weak monsoon intervals corresponding to desiccation and erosion of wetlands. Dating of in situ ceramic and microlithic artifacts within the wetlands indicates Epipaleolithic human occupation of the YT valley after 6.6 ka BP, supporting evidence for widespread colonization of the Tibetan Plateau in the early and mid-Holocene during warm, wet post-glacial conditions.

Print ISSN: 0033-5894

Electronic ISSN: 1096-0287

Topics: Geography , Geosciences

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Lake Level Reconstruction for 12.8–2.3 ka of the Ngangla Ring Tso Closed-Basin Lake System, Southwest Tibetan Plateau (2015)

Hudson, Adam M. ; Quade, Jay ; Huth, Tyler E. ; [et al.]

Cambridge University Press

In: Quaternary Research. 2015; 83(1): 66-79. Published 2015 Jan 01. doi: 10.1016/j.yqres.2014.07.012.

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Publication Date: 2015-01-01

Description: We present a shoreline-based, millennial-scale record of lake-level changes spanning 12.8–2.3 ka for a large closed-basin lake system on the southwestern Tibetan Plateau. Fifty-three radiocarbon and eight U–Th series ages of tufa and beach cement provide age control on paleoshorelines ringing the basin, supplemented by nineteen ages from shell and aquatic plant material from natural exposures generally recording lake regressions. Our results show that paleo-Ngangla Ring Tso exceeded modern lake level (4727 m asl) continuously between ~ 12.8 and 2.3 ka. The lake was at its highstand 135 m (4862 m asl) above the modern lake from 10.3 ka to 8.6 ka. This is similar to other closed-basin lakes in western Tibet, and coincides with peak Northern Hemisphere summer insolation and peak Indian Summer Monsoon intensity. The lake experienced a series of millennial-scale oscillations centered on 11.5, 10.8, 8.3, 5.9 and 3.6 ka, consistent with weak monsoon events in proxy records of the Indian Summer Monsoon. It is unclear whether these events were forced by North Atlantic or Indian Ocean conditions, but based on the abrupt lake-level regressions recorded for Ngangla Ring Tso, they resulted in significant periodic reductions in rainfall over the western Tibetan Plateau throughout the Holocene.

Print ISSN: 0033-5894

Electronic ISSN: 1096-0287

Topics: Geography , Geosciences

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A regional record of expanded Holocene wetlands and prehistoric human occupation from paleowetland deposits of the western Yarlung Tsangpo valley, southern Tibetan Plateau (2016)

Hudson, Adam M. ; Olsen, John W. ; Quade, Jay ; [et al.]

Cambridge University Press

In: Quaternary Research. 2016; 86(1): 13-33. Published 2016 Jul 01. doi: 10.1016/j.yqres.2016.04.001.

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Publication Date: 2016-07-01

Print ISSN: 0033-5894

Electronic ISSN: 1096-0287

Topics: Geography , Geosciences

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Evidence from the Dayao Paleolithic site, Inner Mongolia for human migration into arid northwest China during mid-Pleistocene interglacials (2021)

Ge, Junyi ; Wang, Yinghua ; Shan, Mingchao ; [et al.]

Cambridge University Press

In: Quaternary Research. 2021; 1-17. Published 2021 Mar 05. doi: 10.1017/qua.2020.115. [early online release]

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Publication Date: 2021-03-05

Description: The Dayao Paleolithic site, located in Inner Mongolia on the eastern margin of China's vast northwestern drylands, was a lithic quarry-workshop utilized by Pleistocene human migrants through the region. Determining the age of this activity has previously yielded controversial results. Our magnetostratigraphic and OSL dating results suggest the two artifact-bearing paleosols are correlated with MIS 5 and 7, respectively. Correlating paleoclimatic data with marine δ18O records leads us to conclude that two sandy gravel layers containing many artifacts in the lower part of the Dayao sequence were formed during MIS 9 and 11, if not earlier. Our results reveal that the earliest human occupation at the Dayao site occurred before ca. 400 ka during a relatively warm and moist interglacial period, similar to several subsequent occupations, documenting the earliest and northernmost archaeological assemblage yet reported in China's arid northwest. We conclude that the northward and southward displacements of the East Asian summer monsoon rain belt during past interglacial-glacial cycles were responsible for the discontinuous human occupation detected at the Dayao site. The penetration of this precipitation regime into dryland ecologies via the Huanghe (Yellow River) Valley effectively created a corridor for hominin migration into China's arid northwest.

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Multiproxy evidence for terrestrial and aquatic ecosystem responses during the 8.2 ka cold event as recorded at Højby Sø, Denmark (2010)

Hede, Mikkel Ulfeldt ; Rasmussen, Peter ; Noe-Nygaard, Nanna ; [et al.]

Cambridge University Press

In: Quaternary Research. 2010; 73(3): 485-496. Published 2010 May 01. doi: 10.1016/j.yqres.2009.12.002.

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Publication Date: 2010-05-01

Description: A sediment succession from Højby Sø, a lake in eastern Denmark, covering the time period 9400-7400 cal yr BP was studied using high-resolution geochemistry, magnetic susceptibility, pollen, macrofossil, diatom, and algal pigment analysis to investigate responses of the terrestrial and aquatic ecosystems to the 8.2 ka cold event. A reduced pollen production by thermophilous deciduous tree taxa in the period c. 8250–8000 cal yr BP reveal that the forest ecosystem was affected by low temperatures during the summer and winter/early-spring seasons. This finding is consistent with the timing of the 8.2 ka cold event as registered in the Greenland ice cores. At Højby Sø, the climate anomaly appears to have started 200–250 yr earlier than the 8.2 ka cold event as the lake proxy data provide strong evidence for a precipitation-induced distinct increase in catchment soil erosion beginning around 8500 cal yr BP. Alteration of the terrestrial environment then resulted in a major aquatic ecosystem change with nutrient enrichment of the lake and enhanced productivity, which lasted until c. 7900 cal yr BP.

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