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Eastern Alps may have been ice-free in the time of Ötzi the Iceman 新闻
来源平台:NewScientist. 发布日期:2020
作者:  admin
收藏  |  浏览/下载:18/0  |  提交时间:2020/12/22
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
Sixteen hundred years of increasing tree cover prior to modern deforestation in Southern Amazon and Central Brazilian savannas 期刊论文
Global Change Biology, 2020
作者:  Jamie L. Wright;  Barbara Bomfim;  Corrine I. Wong;  Ben H. Marimon‐;  ;  nior;  Beatriz S. Marimon;  Lucas C. R. Silva
收藏  |  浏览/下载:7/0  |  提交时间:2020/11/09
Agricultural acceleration of soil carbonate weathering 期刊论文
Global Change Biology, 2020
作者:  John H. Kim;  Esteban G. Jobbá;  gy;  Daniel D. Richter;  Susan E. Trumbore;  Robert B. Jackson
收藏  |  浏览/下载:21/0  |  提交时间:2020/08/09
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.


  
Post‐fire carbon dynamics in the tropical peat swamp forests of Brunei reveal long‐term elevated CH4 flux 期刊论文
Global Change Biology, 2020
作者:  Massimo Lupascu;  Hasan Akhtar;  Thomas E. L. Smith;  Rahayu Sukmaria Sukri
收藏  |  浏览/下载:10/0  |  提交时间:2020/08/09
Plant carbon allocation drives turnover of old soil organic matter in permafrost tundra soils 期刊论文
Global Change Biology, 2020
作者:  Lorna E. Street;  Mark H. Garnett;  Jens‐;  Arne Subke;  Robert Baxter;  Joshua F. Dean;  Philip A. Wookey
收藏  |  浏览/下载:8/0  |  提交时间:2020/06/22
Oldest Homo sapiens bones found in Europe 期刊论文
Science, 2020
作者:  Ann Gibbons
收藏  |  浏览/下载:10/0  |  提交时间:2020/05/20
Cahokia's rise parallels onset of corn agriculture 新闻
来源平台:EurekAlert. 发布日期:2020
作者:  admin
收藏  |  浏览/下载:1/0  |  提交时间:2020/05/15
Millennial-scale hydroclimate control of tropical soil carbon storage 期刊论文
NATURE, 2020, 581 (7806) : 63-+
作者:  Lam, Tommy Tsan-Yuk;  Jia, Na;  Zhang, Ya-Wei;  Shum, Marcus Ho-Hin;  Jiang, Jia-Fu;  Zhu, Hua-Chen;  Tong, Yi-Gang;  Shi, Yong-Xia;  Ni, Xue-Bing;  Liao, Yun-Shi;  Li, Wen-Juan;  Jiang, Bao-Gui;  Wei, Wei;  Yuan, Ting-Ting;  Zheng, Kui;  Cui, Xiao-Ming;  Li, Jie;  Pei, Guang-Qian
收藏  |  浏览/下载:25/0  |  提交时间:2020/05/13

Over the past 18,000 years, the residence time and amount of soil carbon stored in the Ganges-Brahmaputra basin have been controlled by the intensity of Indian Summer Monsoon rainfall, with greater carbon destabilization during wetter, warmer conditions.


The storage of organic carbon in the terrestrial biosphere directly affects atmospheric concentrations of carbon dioxide over a wide range of timescales. Within the terrestrial biosphere, the magnitude of carbon storage can vary in response to environmental perturbations such as changing temperature or hydroclimate(1), potentially generating feedback on the atmospheric inventory of carbon dioxide. Although temperature controls the storage of soil organic carbon at mid and high latitudes(2,3), hydroclimate may be the dominant driver of soil carbon persistence in the tropics(4,5)  however, the sensitivity of tropical soil carbon turnover to large-scale hydroclimate variability remains poorly understood. Here we show that changes in Indian Summer Monsoon rainfall have controlled the residence time of soil carbon in the Ganges-Brahmaputra basin over the past 18,000 years. Comparison of radiocarbon ages of bulk organic carbon and terrestrial higher-plant biomarkers with co-located palaeohydrological records(6) reveals a negative relationship between monsoon rainfall and soil organic carbon stocks on a millennial timescale. Across the deglaciation period, a depletion of basin-wide soil carbon stocks was triggered by increasing rainfall and associated enhanced soil respiration rates. Our results suggest that future hydroclimate changes in tropical regions are likely to accelerate soil carbon destabilization, further increasing atmospheric carbon dioxide concentrations.