Global ETD Search
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Showing 1 to 20 of 55 for “"Younger Dryas"”.
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HUMAN RESPONSES TO CLIMATE CHANGE DURING THE YOUNGER DRYAS IN NORTHWEST EUROPE
… cal BP in northwest Europe, with a focus on the Younger Dryas Stadial event, which occurred around 12,900 cal BP to 11,700 cal BP. A set of predicted archaeological indicators were formed from existing theoretical models, based largely on Binford’s logistical and residential mobility model, with …
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Identification of variability in sub-arctic sea ice conditions during the Younger Dryas and Holocene
… of sea ice conditions during the Younger Dryas and the Holocene. Some comparisons with other proxies (e.g. foraminifera, IRD) were also made. A study of a sediment core from Andfjorden (69.16˚N, 16.25˚E), northern Norway, provided unequivocal evidence for the occurrence of seasonal …
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Technology, Serial Specialists, and Younger Dryas Cold Adaptation in the Northern Great Basin of North America
… cold stress and environmental change during the Younger Dryas (12,900 – 11,700 calibrated years before present [cal BP]) through analyses of perishable and lithic technological organization, seasonality, and settlement strategies. Researchers have debated to the degree to which Younger Dryas cold …
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Geochemical evaluation of the Younger Dryas Boundary (YDB) impact hypothesis, El Carrizal Baja California Sur, Mexico
The Younger Dryas Boundary (YDB) extraterrestrial impact hypothesis is purported to have triggered the Younger Dryas stadial and coincides with the Pleistocene extinction and disappearance of the Clovis Paleo-Indian culture. Evidence supporting or refuting this hypothesis has great implications for …
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A central Texas drying event identified at the Younger Dryas-early Holocene transition using coupled speleothem 𝛿¹³C-¹⁴C analysis
The Younger Dryas (YD, 12,900-11,700 years BP) is characterized by a return to near-glacial conditions in the northern hemisphere during the last deglacial period. Texas moisture proxy records support a general regional warming/drying trend from the YD through the Holocene, however, the timing and …
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A Multidisciplinary Investigation of the Intermediate Depths of the Atlantic Ocean: AAIW delta^13C Variability During the Younger Dryas and Lithoherms in the Straits of Florida
… stable isotopic variability of AAIW during the Younger Dryas cooling event. The data reveal concurrent delta^13 C and delta^18 O excursions of 0.59 ppt and 0.37 ppt within the core of Antarctic Intermediate Water (AAIW) centered at 11,381 calendar years before present based on radiometric age …
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Abrupt climate change in the Atlantic Ocean during the last 20,000 years : insights from multi-element analysis of benthic and planktic foraminifera and a coupled OA-GCM
… of North Atlantic Intermediate Water during the Younger Dryas. Paired records. of benthic foraminiferal Mg/Ca and bIRO from two intermediate depth low latitude western Atlantic sites - one from the Florida Current (751 m) and one from the Little Bahama Bank (l,057 m) - provicie insights into the …
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Tropical climate variability from the last glacial maximum to the present
… that the diatom population was larger during the Younger Dryas cold event, indicating that upwelling was enhanced and the mean position of the ITCZ was farther south during the Younger Dryas than it is today. A climate simulation using an ocean-atmosphere general circulation model confirms these …
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The paleoceanography of the Bering Sea during the last glacial cycle
… Last Glacial Maximum, Bolling-Allerod, or the Younger Dryas cold phase. N. pachyderma (s.) δ18O in the Bering Slope core decreases rapidly (in less than 220 y) by 0.7-0.8% at the onset of the Bolling and the end of the Younger Dryas. These isotopic shifts are accompanied by transient decreases …
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Tidally Forced Marine Ice Stream Instabilities and Their Consequences
… I additionally find that the recovery from the Younger Dryas occurred through the same mechanism as Dansgaard-Oeschger oscillations, specifically a polynya opening in the Irminger Sea allowing for the exchange of heat between the ocean and atmosphere and the resumption of the Atlantic Meridional …
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The paleoceanography of the Bering Sea during the last glacial cycle
… the Last Glacial Maximum, Blling-Allerd, or the Younger Dryas cold phase. N. pachyderma (s.) 18O in the Bering Slope core decreases rapidly (in less than 220 y) by 0.7-0.8h at the onset of the Blling and the end of the Younger Dryas. These isotopic shifts are accompanied by transient decreases in …
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The centennial and millennial variability of the IndoPacific warm pool and the Indonesian Throughflow
… cold events (Heinrich Stadial 1 and the Younger Dryas). From these results we postulate that the mean position of the Intertropical Convergence Zone was approximately the same as modern at the last glacial maximum and was likely displaced to the south during the Younger Dryas and Heinrich …
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Tropical climate variability from the last glacial maximum to the present
… that the diatom population was larger during the Younger Dryas cold event, indicating that upwelling was enhanced and the mean position of the ITCZ was farther south during the Younger Dryas than it is today. A climate simulation using an ocean-atmosphere general circulation model confirms these …
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A Glacial Sedimentary System in Northwest Spitzbergen
… during the Holocene. There is no evidence of Younger Dryas glacier expansion preserved in the marine sediments, or in terrestrial moraines. Denudation rates calculated from lacustrine sediment accumulation infer the presence of smaller glaciers in Signedalen during the Younger Dryas than at …
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Rates of natural climate change : a study of speleothems
… palaeoclimate proxies appear to be linked. The Younger Dryas (YO) cold event is dated at between 12.5 and 11.4 Ka BP in both speleothem records. The dominant agent of palaeoclimatic variation during the YD is probably changes in North Atlantic ocean circulation. A Microsoft Excel spreadsheet is …
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The centennial and millennial variability of the IndoPacific Warm Pool and the Indonesian Throughflow
… and was displaced to the south during the Younger Dryas and Heinrich Stadial 1, suggesting the ITCZ responds to changes in the interhemispheric temperature gradient.
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Prehistoric Colonization of Southcentral Alaska: Human Adaptations in a Post Glacial World
… in southcentral Alaska. The sites range from the Younger Dryas to middle Holocene in age and provide valuable contextual information for the human process of colonizing a region that was heavily glaciated during the LGM. The deglaciation and human colonization of southcentral Alaska is one of the …
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Benthic environmental responses to climatic changes during the late Quaternary: a micropalaeontological and geochemical approach
… Heinrich event 1, the Bølling Allerød and the Younger Dryas (18-11.5 ka) and throughout the Holocene (11 ka – present). From the Benguela Upwelling System, six benthic foraminiferal assemblages were documented within the record: the first two during MIS4 and early MIS3 (70-59 and 59-40 ka), …
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Investigating Mexican paleoclimate with precisely dated speleothems
… Mexican response to the 8.2 ka event and the Younger Dryas. These chapters show that the San Luis Potosí region is vulnerable to droughts under multiple climate mean states, and is subject to drying as Atlantic Meridional Overturning Circulation weakens due to anthropogenic climate change. The …
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The impact of glaciation and climate change on biogeochemical cycling and landscape development
… 6.7% with a range of 3.9% to 8.5% during the Younger Dryas but recorded a lower average before and after at 4.9% and 4.6% respectively. Occluded phosphorus acted similarly with a higher average during the cooling event, 2626 µg/g, and lower averages before and after, 1404 µg/g and 1461 µg/g, …
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