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Thumb-sized device quickly 'sniffs out' bad breath 新闻
来源平台：EurekAlert. 发布日期：2021
作者:  admin
收藏  |  浏览/下载：16/0  |  提交时间：2021/07/26
NASA missions to test idea of a watery past for Venus 期刊论文
Science, 2021
作者:  Paul Voosen
收藏  |  浏览/下载：21/0  |  提交时间：2021/06/15
'Swiss Army knife' catalyst can make natural gas burn cleaner 新闻
来源平台：EurekAlert. 发布日期：2021
作者:  admin
收藏  |  浏览/下载：23/0  |  提交时间：2021/01/15
Creating value from plastic waste 期刊论文
Science, 2020
作者:  Bert M. Weckhuysen
收藏  |  浏览/下载：2/0  |  提交时间：2020/10/26
Identification of chondritic krypton and xenon in Yellowstone gases and the timing of terrestrial volatile accretion 期刊论文
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2020, 117 (25) : 13997-14004
作者:  Broadley, Michael W.;  Barry, Peter H.;  Bekaert, David V.;  Byrne, David J.;  Caracausi, Antonio;  Ballentine, Christopher J.;  Marty, Bernard
收藏  |  浏览/下载：9/0  |  提交时间：2020/06/16
origin of Earth'  s volatiles  accretion  mantle plume  noble gases  Yellowstone  
Hydrothermal (NN)-N-15-N-15 abundances constrain the origins of mantle nitrogen 期刊论文
NATURE, 2020, 580 (7803) : 367-+
作者:  Zhao, Steven;  Jang, Cholsoon;  Liu, Joyce;  Uehara, Kahealani;  Gilbert, Michael;  Izzo, Luke;  Zeng, Xianfeng;  Trefely, Sophie;  Fernandez, Sully;  Carrer, Alessandro;  Miller, Katelyn D.;  Schug, Zachary T.;  Snyder, Nathaniel W.;  Gade, Terence P.;  Titchenell, Paul M.;  Rabinowitz, Joshua D.;  Wellen, Kathryn E.
收藏  |  浏览/下载：14/0  |  提交时间：2020/05/13

Nitrogen is the main constituent of the Earth'  s atmosphere, but its provenance in the Earth'  s mantle remains uncertain. The relative contribution of primordial nitrogen inherited during the Earth'  s accretion versus that subducted from the Earth'  s surface is unclear(1-6). Here we show that the mantle may have retained remnants of such primordial nitrogen. We use the rare (NN)-N-15-N-15 isotopologue of N-2 as a new tracer of air contamination in volcanic gas effusions. By constraining air contamination in gases from Iceland, Eifel (Germany) and Yellowstone (USA), we derive estimates of mantle delta N-15 (the fractional difference in N-15/N-14 from air), N-2/Ar-36 and N-2/He-3. Our results show that negative delta N-15 values observed in gases, previously regarded as indicating a mantle origin for nitrogen(7-10), in fact represent dominantly air-derived N-2 that experienced N-15/N-14 fractionation in hydrothermal systems. Using two-component mixing models to correct for this effect, the (NN)-N-15-N-15 data allow extrapolations that characterize mantle endmember delta N-15, N-2/Ar-36 and N-2/He-3 values. We show that the Eifel region has slightly increased delta N-15 and N-2/Ar-36 values relative to estimates for the convective mantle provided by mid-ocean-ridge basalts(11), consistent with subducted nitrogen being added to the mantle source. In contrast, we find that whereas the Yellowstone plume has delta N-15 values substantially greater than that of the convective mantle, resembling surface components(12-15), its N-2/Ar-36 and N-2/He-3 ratios are indistinguishable from those of the convective mantle. This observation raises the possibility that the plume hosts a primordial component. We provide a test of the subduction hypothesis with a two-box model, describing the evolution of mantle and surface nitrogen through geological time. We show that the effect of subduction on the deep nitrogen cycle may be less important than has been suggested by previous investigations. We propose instead that high mid-ocean-ridge basalt and plume delta N-15 values may both be dominantly primordial features.


  
Geochemical evidence for high volatile fluxes from the mantle at the end of the Archaean 期刊论文
Nature, 2019, 575: 485-488
作者:  Bernard Marty;  David V. Bekaert;  Michael W. Broadley;  Claude Jaupart
收藏  |  浏览/下载：6/0  |  提交时间：2019/11/27
Earth's radiative imbalance from the Last Glacial Maximum to the present 期刊论文
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2019, 116 (30) : 14881-14886
作者:  Baggenstos, Daniel;  Haberli, Marcel;  Schmitt, Jochen;  Shackleton, Sarah A.;  Birner, Benjamin;  Severinghaus, Jeffrey P.;  Kellerhals, Thomas;  Fischer, Hubertus
收藏  |  浏览/下载：6/0  |  提交时间：2019/11/27
paleoclimate  deglaciation  noble gases  energy budget  ice cores  
Detecting and explaining why aquifers occasionally become degraded near hydraulically fractured shale gas wells 期刊论文
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2018, 115 (49) : 12349-12358
作者:  Woda, Josh;  Wen, Tao;  Oakley, David;  Yoxtheimer, David;  Engelder, Terry;  Castro, M. Clara;  Brantley, Susan L.
收藏  |  浏览/下载：7/0  |  提交时间：2019/11/27
shale gas  water quality  methane  noble gases  hydraulic fracturing  
Reconstructing Past Ocean Temperatures with Samples of Antarctic Ice 新闻
来源平台：Environmental Monitor. 发布日期：2018
作者:  admin
收藏  |  浏览/下载：0/0  |  提交时间：2019/04/17