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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:26/0  |  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.


  
The potential of Orbiting Carbon Observatory-2 data to reduce the uncertainties in CO2 surface fluxes over Australia using a variational assimilation scheme 期刊论文
ATMOSPHERIC CHEMISTRY AND PHYSICS, 2020, 20 (14) : 8473-8500
作者:  Villalobos, Yohanna;  Rayner, Peter;  Thomas, Steven;  Silver, Jeremy
收藏  |  浏览/下载:16/0  |  提交时间:2020/08/09
Last glacial atmospheric CO(2)decline due to widespread Pacific deep-water expansion 期刊论文
NATURE GEOSCIENCE, 2020
作者:  Yu, J.;  Menviel, L.;  Jin, Z. D.;  Anderson, R. F.;  Jian, Z.;  Piotrowski, A. M.;  Ma, X.;  Rohling, E. J.;  Zhang, F.;  Marino, G.;  McManus, J. F.
收藏  |  浏览/下载:12/0  |  提交时间:2020/08/09
Global distribution and 14-year changes in erythemal irradiance, UV atmospheric transmission, and total column ozone for 2005-2018 estimated from OMI and EPIC observations 期刊论文
ATMOSPHERIC CHEMISTRY AND PHYSICS, 2020, 20 (14) : 8351-8380
作者:  Herman, Jay;  Cede, Alexander;  Huang, Liang;  Ziemke, Jerald;  Torres, Omar;  Krotkov, Nickolay;  Kowalewski, Matthew;  Blank, Karin
收藏  |  浏览/下载:11/0  |  提交时间:2020/07/21
Smoke of extreme Australian bushfires observed in the stratosphere over Punta Arenas, Chile, in January 2020: optical thickness, lidar ratios, and depolarization ratios at 355 and 532 nm 期刊论文
ATMOSPHERIC CHEMISTRY AND PHYSICS, 2020, 20 (13) : 8003-8015
作者:  Ohneiser, Kevin;  Ansmann, Albert;  Baars, Holger;  Seifert, Patric;  Barja, Boris;  Jimenez, Cristofer;  Radenz, Martin;  Teisseire, Audrey;  Floutsi, Athina;  Haarig, Moritz;  Foth, Andreas;  Chudnovsky, Alexandra;  Engelmann, Ronny;  Zamorano, Felix;  Buehl, Johannes;  Wandinger, Ulla
收藏  |  浏览/下载:12/0  |  提交时间:2020/08/18
Marine productivity and synoptic meteorology drive summer-time variability in Southern Ocean aerosols 期刊论文
ATMOSPHERIC CHEMISTRY AND PHYSICS, 2020, 20 (13) : 8047-8062
作者:  Alroe, Joel;  Cravigan, Luke T.;  Miljevic, Branka;  Johnson, Graham R.;  Selleck, Paul;  Humphries, Ruhi S.;  Keywood, Melita D.;  Chambers, Scott D.;  Williams, Alastair G.;  Ristovski, Zoran D.
收藏  |  浏览/下载:7/0  |  提交时间:2020/07/14
Sea spray aerosol organic enrichment, water uptake and surface tension effects 期刊论文
ATMOSPHERIC CHEMISTRY AND PHYSICS, 2020, 20 (13) : 7955-7977
作者:  Cravigan, Luke T.;  Mallet, Marc D.;  Vaattovaara, Petri;  Harvey, Mike J.;  Law, Cliff S.;  Modini, Robin L.;  Russell, Lynn M.;  Stelcer, Ed;  Cohen, David D.;  Olsen, Greg;  Safi, Karl;  Burrell, Timothy J.;  Ristovski, Zoran
收藏  |  浏览/下载:10/0  |  提交时间:2020/07/14
Late Paleozoic tectonic transition from subduction to post-collisional extension in Eastern Tianshan, Central Asian Orogenic Belt 期刊论文
GEOLOGICAL SOCIETY OF AMERICA BULLETIN, 2020, 132 (7-8) : 1756-1774
作者:  Muhtar, M. N.;  Wu, Chang-Zhi;  Santosh, M.;  Lei, Ru-Xiong;  Gu, Lian-Xing;  Wang, Si-Meng;  Gan, Kai
收藏  |  浏览/下载:11/0  |  提交时间:2020/08/18
Sm-Nd isochron dating and geochemical (rare earth elements, Sr-87/Sr-86, delta O-18, delta C-13) characterization of calcite veins in the Jiaoshiba shale gas field, China: Implications for the mechanisms of vein formation in shale gas systems 期刊论文
GEOLOGICAL SOCIETY OF AMERICA BULLETIN, 2020, 132 (7-8) : 1722-1740
作者:  Gao, Jian;  He, Sheng;  Zhao, Jian-xin;  He, Zhiliang;  Wu, Changwu;  Fen, Yuexing;  Ai Duc Nguyen;  Zhou, Jiaxi;  Yi, Zhixing
收藏  |  浏览/下载:12/0  |  提交时间:2020/08/18
Refined Permian-Triassic floristic timeline reveals early collapse and delayed recovery of south polar terrestrial ecosystems 期刊论文
GEOLOGICAL SOCIETY OF AMERICA BULLETIN, 2020, 132 (7-8) : 1489-1513
作者:  Mays, Chris;  Vajda, Vivi;  Frank, Tracy D.;  Fielding, Christopher R.;  Nicoll, Robert S.;  Tevyaw, Allen P.;  McLoughlin, Stephen
收藏  |  浏览/下载:10/0  |  提交时间:2020/08/18