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Phasing of millennial-scale climate variability in the Pacific and Atlantic Oceans 期刊论文
Science, 2020
作者:  Maureen H. Walczak;  Alan C. Mix;  Ellen A. Cowan;  Stewart Fallon;  L. Keith Fifield;  Jay R. Alder;  Jianghui Du;  Brian Haley;  Tim Hobern;  June Padman;  Summer K. Praetorius;  Andreas Schmittner;  Joseph S. Stoner;  Sarah D. Zellers
收藏  |  浏览/下载:11/0  |  提交时间:2020/11/09
Steering iceberg armadas 期刊论文
Science, 2020
作者:  John M. Jaeger;  Amelia E. Shevenell
收藏  |  浏览/下载:7/0  |  提交时间:2020/11/09
Ice discharge in the North Pacific set off series of climate events during last ice age 新闻
来源平台:EurekAlert. 发布日期:2020
作者:  admin
收藏  |  浏览/下载:0/0  |  提交时间:2020/10/12
Ice Discharge in the North Pacific Set Off Series of Climate Events During Last Ice Age 新闻
来源平台:Science Daily. 发布日期:2020
作者:  admin
收藏  |  浏览/下载:4/0  |  提交时间:2020/10/12
The timing and effect of the earliest human arrivals in North America 期刊论文
NATURE, 2020
作者:  Lorena Becerra-Valdivia;  Thomas Higham
收藏  |  浏览/下载:27/0  |  提交时间:2020/08/09

The peopling of the Americas marks a major expansion of humans across the planet. However, questions regarding the timing and mechanisms of this dispersal remain, and the previously accepted model (termed '  Clovis-first'  )-suggesting that the first inhabitants of the Americas were linked with the Clovis tradition, a complex marked by distinctive fluted lithic points(1)-has been effectively refuted. Here we analyse chronometric data from 42 North American and Beringian archaeological sites using a Bayesian age modelling approach, and use the resulting chronological framework to elucidate spatiotemporal patterns of human dispersal. We then integrate these patterns with the available genetic and climatic evidence. The data obtained show that humans were probably present before, during and immediately after the Last Glacial Maximum (about 26.5-19 thousand years ago)(2,3)but that more widespread occupation began during a period of abrupt warming, Greenland Interstadial 1 (about 14.7-12.9 thousand years beforead 2000)(4). We also identify the near-synchronous commencement of Beringian, Clovis and Western Stemmed cultural traditions, and an overlap of each with the last dates for the appearance of 18 now-extinct faunal genera. Our analysis suggests that the widespread expansion of humans through North America was a key factor in the extinction of large terrestrial mammals.


A Bayesian age model suggests that human dispersal to the Americas probably began before the Last Glacial Maximum, overlapping with the last dates of appearance for several faunal genera.


  
Sediment controls dynamic behavior of a Cordilleran Ice Stream at the Last Glacial Maximum 期刊论文
NATURE COMMUNICATIONS, 2020, 11 (1)
作者:  Cowan, Ellen A.;  Zellers, Sarah D.;  Mueller, Juliane;  Walczak, Maureen H.;  Worthington, Lindsay L.;  Caissie, Beth E.;  Clary, Wesley A.;  Jaeger, John M.;  Gulick, Sean P. S.;  Pratt, Jacob W.;  Mix, Alan C.;  Fallon, Stewart J.
收藏  |  浏览/下载:10/0  |  提交时间:2020/05/13
Sequence stratigraphy and depositional history of the Baranof Fan: Insights for Cordilleran Ice Sheet outflow to the Gulf of Alaska 期刊论文
GEOLOGICAL SOCIETY OF AMERICA BULLETIN, 2020, 132 (1-2) : 353-372
作者:  Zhang, Jiajia;  Gulick, Sean P. S.
收藏  |  浏览/下载:6/0  |  提交时间:2020/07/02
Leveraging the Rapid Retreat of the Amundsen Gulf Ice Stream 13,000 Years Ago to Reveal Insight Into North American Deglaciation 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2019, 46 (21) : 12101-12107
作者:  Pico, T.;  Robel, A.;  Powell, E.;  Mix, A. C.;  Mitrovica, J. X.
收藏  |  浏览/下载:5/0  |  提交时间:2020/02/17
Glacial isostatic adjustment  Marine ice sheet instability  Deglaciation  Ice stream  Laurentide Ice Sheet  
Applying the Community Ice Sheet Model to evaluate PMIP3 LGM climatologies over the North American ice sheets 期刊论文
CLIMATE DYNAMICS, 2019, 53: 2807-2824
作者:  Alder, Jay R.;  Hostetler, Steven W.
收藏  |  浏览/下载:8/0  |  提交时间:2019/11/27
PMIP3  LGM  Model evaluation  CISM2  Ice sheet modeling  
Testing the Refugia Hypothesis in Southeast Alaska Using Paleogenetics and Glacial Chronology 项目
项目编号:1854550; 经费:542156(USD); 起止日期:2019 / dc_date_end
项目负责人:  Charlotte Lindqvist (Principal Investigator)
收藏  |  浏览/下载:7/0  |  提交时间:2019/11/27