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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.


  
Linking Marine Biological Activity to Aerosol Chemical Composition and Cloud-Relevant Properties Over the North Atlantic Ocean 期刊论文
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2020, 125 (13)
作者:  Mansour, Karam;  39;Dowd, Colin
收藏  |  浏览/下载:12/0  |  提交时间:2020/08/18
aerosol-cloud interactions  CCN  INP  marine aerosol  ocean-atmosphere interactions  oceanic biological activity  
Extreme climate after massive eruption of Alaska's Okmok volcano in 43 BCE and effects on the late Roman Republic and Ptolemaic Kingdom 期刊论文
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2020, 117 (27) : 15443-15449
作者:  McConnell, Joseph R.;  Sigl, Michael;  Plunkett, Gill;  Burke, Andrea;  Kim, Woon Mi;  Raible, Christoph C.;  Wilson, Andrew, I;  Manning, Joseph G.;  Ludlow, Francis;  Chellman, Nathan J.;  Innes, Helen M.;  Yang, Zhen;  Larsen, Jessica F.;  Schaefer, Janet R.;  Kipfstuhl, Sepp;  Mojtabavi, Seyedhamidreza;  Wilhelms, Frank;  Opel, Thomas;  Meyer, Hanno;  Steffensen, Jorgen Peder
收藏  |  浏览/下载:17/0  |  提交时间:2020/06/29
ice core  volcano  Okmok  Rome  climate forcing  
The potential impacts of a sulfur- and halogen-rich supereruption such as Los Chocoyos on the atmosphere and climate 期刊论文
ATMOSPHERIC CHEMISTRY AND PHYSICS, 2020, 20 (11) : 6521-6539
作者:  Brenna, Hans;  Kutterolf, Steffen;  Mills, Michael J.;  Krueger, Kirstin
收藏  |  浏览/下载:15/0  |  提交时间:2020/06/09
The Spatiotemporal Variability of Cloud Radiative Effects on the Greenland Ice Sheet Surface Mass Balance 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2020, 47 (12)
作者:  Izeboud, M.;  Lhermitte, S.;  Van Tricht, K.;  Lenaerts, J. T. M.;  Van Lipzig, N. P. M.;  Wever, N.
收藏  |  浏览/下载:9/0  |  提交时间:2020/06/09
cloud radiative effect  Greenland ice sheet  cloud impact  
What can Hydrography Tell Us About the Strength of the Nordic Seas MOC Over the Last 70 to 100 Years? 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2020, 47 (12)
作者:  Rossby, T.;  Chafik, Leon;  Houpert, Loic
收藏  |  浏览/下载:11/0  |  提交时间:2020/06/01
Photic Barriers to Poleward Range-shifts 期刊论文
TRENDS IN ECOLOGY & EVOLUTION, 2020, 35 (8) : 652-655
作者:  Huffeldt, Nicholas Per
收藏  |  浏览/下载:0/0  |  提交时间:2020/06/01
Extending the Global Mass Change Data Record: GRACE Follow-On Instrument and Science Data Performance 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2020, 47 (12)
作者:  Landerer, Felix W.;  Flechtner, Frank M.;  Save, Himanshu;  Webb, Frank H.;  Bandikova, Tamara;  Bertiger, William, I;  Bettadpur, Srinivas, V;  Byun, Sung Hun;  Dahle, Christoph;  Dobslaw, Henryk;  Fahnestock, Eugene;  Harvey, Nate;  Kang, Zhigui;  Kruizinga, Gerhard L. H.;  Loomis, Bryant D.;  McCullough, Christopher;  Murboeck, Michael;  Nagel, Peter;  Paik, Meegyeong;  Pie, Nadege;  Poole, Steve;  Strekalov, Dmitry;  Tamisiea, Mark E.;  Wang, Furun;  Watkins, Michael M.;  Wen, Hui-Ying;  Wiese, David N.;  Yuan, Dah-Ning
收藏  |  浏览/下载:12/0  |  提交时间:2020/05/25
GRACE-FO  satellite gravimetry  mass change  hydrogeodesy  ice melt  mass transport  
Warm Temperature Extremes Across Greenland Connected to Clouds 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2020, 47 (9)
作者:  Gallagher, Michael R.;  Chepfer, Helene;  Shupe, Matthew D.;  Guzman, Rodrigo
收藏  |  浏览/下载:6/0  |  提交时间:2020/07/02
Greenland ice sheet  cloud impacts  energy budget  warming events  Arctic climate  
Greenland Ice Sheet Contribution to 21st Century Sea Level Rise as Simulated by the Coupled CESM2.1-CISM2.1 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2020, 47 (9)
作者:  Muntjewerf, Laura;  Petrini, Michele;  Vizcaino, Miren;  da Silva, Carolina Ernani;  Sellevold, Raymond;  Scherrenberg, Meike D. W.;  Thayer-Calder, Katherine;  Bradley, Sarah L.;  Lenaerts, Jan T. M.;  Lipscomb, William H.;  Lofverstrom, Marcus
收藏  |  浏览/下载:17/0  |  提交时间:2020/07/02
Greenland Ice Sheet  Sea level rise  21st century