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Combined ground and aerial measurements resolve vent-specific gas fluxes from a multi-vent volcano 期刊论文
NATURE COMMUNICATIONS, 2020, 11 (1)
作者:  Pering, T. D.;  Liu, E. J.;  Wood, K.;  Wilkes, T. C.;  Aiuppa, A.;  Tamburello, G.;  Bitetto, M.;  Richardson, T.;  McGonigle, A. J. S.
收藏  |  浏览/下载：7/0  |  提交时间：2020/06/22
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.


  
Identifying a human signal in the North Atlantic warming hole 期刊论文
NATURE COMMUNICATIONS, 2020, 11 (1)
作者:  Chemke, Rei;  Zanna, Laure;  Polvani, Lorenzo M.
收藏  |  浏览/下载：5/0  |  提交时间：2020/05/13
Formation Criteria for Hyporheic Anoxic Microzones: Assessing Interactions of Hydraulics, Nutrients, and Biofilms 期刊论文
WATER RESOURCES RESEARCH, 2020, 56 (3)
作者:  Chowdhury, Sinchan Roy;  Zarnetske, Jay P.;  Phanikumar, Mantha S.;  Briggs, Martin A.;  Day-Lewis, Frederick;  Singha, Kamini
收藏  |  浏览/下载：6/0  |  提交时间：2020/07/02
Natural halogens buffer tropospheric ozone in a changing climate 期刊论文
NATURE CLIMATE CHANGE, 2020, 10 (2) : 147-+
作者:  Iglesias-Suarez, Fernando;  Badia, Alba;  Fernandez, Rafael P.;  Cuevas, Carlos A.;  Kinnison, Douglas E.;  Tilmes, Simone;  Lamarque, Jean-Francois;  Long, Mathew C.;  Hossaini, Ryan;  Saiz-Lopez, Alfonso
收藏  |  浏览/下载：9/0  |  提交时间：2020/05/13
Simultaneous numerical representation of soil microsite production and consumption of carbon dioxide, methane, and nitrous oxide using probability distribution functions 期刊论文
GLOBAL CHANGE BIOLOGY, 2019
作者:  Sihi, Debjani;  Davidson, Eric A.;  Savage, Kathleen E.;  Liang, Dong
收藏  |  浏览/下载：21/0  |  提交时间：2019/11/27
CH4  CO2  DAMM  DAMM-GHG  greenhouse gas  N2O  probability distribution function  soil microsite  
Water-use efficiency in a semi-arid woodland with high rainfall variability 期刊论文
GLOBAL CHANGE BIOLOGY, 2019
作者:  Tarin, Tonantzin;  Nolan, Rachael H.;  Medlyn, Belinda E.;  Cleverly, James;  Eamus, Derek
收藏  |  浏览/下载：8/0  |  提交时间：2019/11/27
Acacia  Australia  carbon flux  eddy covariance  optimal stomatal behaviour  photosynthesis  stable isotopes  
Synthetic dissipation and cascade fluxes in a turbulent quantum gas 期刊论文
SCIENCE, 2019, 366 (6463) : 382-+
作者:  Navon, Nir;  Eigen, Christoph;  Zhang, Jinyi;  Lopes, Raphael;  Gaunt, Alexander L.;  Fujimoto, Kazuya;  Tsubota, Makoto;  Smith, Robert P.;  Hadzibabic, Zoran
收藏  |  浏览/下载：6/0  |  提交时间：2019/11/27
Methane emissions from contrasting urban freshwaters: Rates, drivers, and a whole-city footprint 期刊论文
GLOBAL CHANGE BIOLOGY, 2019
作者:  Ortega, Sonia Herrero;  Gonzalez-Quijano, Clara Romero;  Casper, Peter;  Singer, Gabriel A.;  Gessner, Mark O.
收藏  |  浏览/下载：6/0  |  提交时间：2019/11/27
CH4 flux  greenhouse gas  land use  urban ecology  urban ponds  urbanization impact  
CO2 emissions from an undrained tropical peatland: Interacting influences of temperature, shading and water table depth 期刊论文
GLOBAL CHANGE BIOLOGY, 2019, 25 (9) : 2885-2899
作者:  Hoyt, Alison M.;  Gandois, Laure;  Eri, Jangarun;  Kai, Fuu Ming;  Harvey, Charles F.;  Cobb, Alexander R.
收藏  |  浏览/下载：7/0  |  提交时间：2019/11/27
closed dynamic chamber technique  CO2 flux  diurnal cycle  heterotrophic respiration  soil temperature  Southeast Asia  tropical peatland