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Cloud cooling effects of afforestation and reforestation at midlatitudes 期刊论文
Proceedings of the National Academy of Science, 2021
作者:  Sara Cerasoli;  Jun Yin;  Amilcare Porporato
收藏  |  浏览/下载:4/0  |  提交时间:2021/08/17
Arctic soil patterns analogous to fluid instabilities 期刊论文
Proceedings of the National Academy of Science, 2021
作者:  Rachel C. Glade;  Michael M. Fratkin;  Mehdi Pouragha;  Ali Seiphoori;  Joel C. Rowland
收藏  |  浏览/下载:5/0  |  提交时间:2021/06/07
Experimental determination of porosity and methane sorption capacity of organic-rich shales as a function of effective stress: Implications for gas storage capacity 期刊论文
AAPG Bulletin, 2021
作者:  Garri Gaus;  Reinhard Fink;  Alexandra Amann-Hildenbrand;  Bernhard M. Krooss;  Ralf Littke
收藏  |  浏览/下载:4/0  |  提交时间:2021/02/22
Persistence of soil organic carbon caused by functional complexity 期刊论文
NATURE GEOSCIENCE, 2020
作者:  Lehmann, Johannes;  Hansel, Colleen M.;  Kaiser, Christina;  Kleber, Markus;  Maher, Kate;  Manzoni, Stefano;  Nunan, Naoise;  Reichstein, Markus;  Schimel, Joshua P.;  Torn, Margaret S.;  Wieder, William R.;  Koegel-Knabner, Ingrid
收藏  |  浏览/下载:12/0  |  提交时间:2020/08/09
Mud in rivers transported as flocculated and suspended bed material 期刊论文
NATURE GEOSCIENCE, 2020
作者:  Lamb, Michael P.;  de Leeuw, Jan;  Fischer, Woodward W.;  Moodie, Andrew J.;  Venditti, Jeremy G.;  Nittrouer, Jeffrey A.;  Haught, Daniel;  Parker, Gary
收藏  |  浏览/下载:11/0  |  提交时间:2020/07/09
The age distribution of global soil carbon inferred from radiocarbon measurements 期刊论文
NATURE GEOSCIENCE, 2020
作者:  Shi, Zheng;  Allison, Steven D.;  He, Yujie;  Levine, Paul A.;  Hoyt, Alison M.;  Beem-Miller, Jeffrey;  Zhu, Qing;  Wieder, William R.;  Trumbore, Susan;  Randerson, James T.
收藏  |  浏览/下载:18/0  |  提交时间:2020/07/06
Tropical forest loss enhanced by large-scale land acquisitions 期刊论文
NATURE GEOSCIENCE, 2020, 13 (7) : 482-+
作者:  Davis, Kyle Frankel;  39;Angelo, Jampel;  39;Odorico, Paolo
收藏  |  浏览/下载:15/0  |  提交时间:2020/06/29
Sedimentology, diagenesis, and reservoir characterization of the Permian White Rim Sandstone, southern Utah: Implications for carbon capture and sequestration potential 期刊论文
AAPG Bulletin, 2020
作者:  David Wheatley;  Spencer Hollingworth;  Peter Steele;  Marjorie Chan
收藏  |  浏览/下载:8/0  |  提交时间:2020/06/22
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.


  
Molecular tuning of CO2-to-ethylene conversion 期刊论文
NATURE, 2020, 577 (7791) : 509-+
作者:  Li, Fengwang;  39;Brien, Colin P.
收藏  |  浏览/下载:11/0  |  提交时间:2020/07/03

The electrocatalytic reduction of carbon dioxide, powered by renewable electricity, to produce valuable fuels and feedstocks provides a sustainable and carbon-neutral approach to the storage of energy produced by intermittent renewable sources(1). However, the highly selective generation of economically desirable products such as ethylene from the carbon dioxide reduction reaction (CO2RR) remains a challenge(2). Tuning the stabilities of intermediates to favour a desired reaction pathway can improve selectivity(3-5), and this has recently been explored for the reaction on copper by controlling morphology(6), grain boundaries(7), facets(8), oxidation state(9) and dopants(10). Unfortunately, the Faradaic efficiency for ethylene is still low in neutral media (60 per cent at a partial current density of 7 milliamperes per square centimetre in the best catalyst reported so far(9)), resulting in a low energy efficiency. Here we present a molecular tuning strategy-the functionalization of the surface of electrocatalysts with organic molecules-that stabilizes intermediates for more selective CO2RR to ethylene. Using electrochemical, operando/in situ spectroscopic and computational studies, we investigate the influence of a library of molecules, derived by electro-dimerization of arylpyridiniums(11), adsorbed on copper. We find that the adhered molecules improve the stabilization of an '  atop-bound'  CO intermediate (that is, an intermediate bound to a single copper atom), thereby favouring further reduction to ethylene. As a result of this strategy, we report the CO2RR to ethylene with a Faradaic efficiency of 72 per cent at a partial current density of 230 milliamperes per square centimetre in a liquid-electrolyte flow cell in a neutral medium. We report stable ethylene electrosynthesis for 190 hours in a system based on a membrane-electrode assembly that provides a full-cell energy efficiency of 20 per cent. We anticipate that this may be generalized to enable molecular strategies to complement heterogeneous catalysts by stabilizing intermediates through local molecular tuning.


Electrocatalytic reduction of CO2 over copper can be made highly selective by '  tuning'  the copper surface with adsorbed organic molecules to stabilize intermediates for carbon-based fuels such as ethylene