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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
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
Minimal cobalt metabolism in the marine cyanobacterium Prochlorococcus 期刊论文
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2020, 117 (27) : 15740-15747
作者:  Hawco, Nicholas J.;  McIlvin, Matthew M.;  Bundy, Randelle M.;  Tagliabue, Alessandro;  Goepfert, Tyler J.;  Moran, Dawn M.;  Valentin-Alvarado, Luis;  DiTullio, Giacomo R.;  Saito, Mak A.
收藏  |  浏览/下载:10/0  |  提交时间:2020/06/29
Prochlorococcus  vitamin B12  iron  Pacific Ocean  nutrient limitation  
Linkage between ENSO phases and western US snow water equivalent 期刊论文
ATMOSPHERIC RESEARCH, 2020, 236
作者:  Thakur, Balbhadra;  Kalra, Ajay;  Lakshmi, Venkat;  Lamb, Kenneth W.;  Miller, William P.;  Tootle, Glenn
收藏  |  浏览/下载:12/0  |  提交时间:2020/07/02
Climate change  Snow water equivalent  ENSO  Trend  Shift  Persistence  
Weather regimes linked to daily precipitation anomalies in Northern Chile 期刊论文
ATMOSPHERIC RESEARCH, 2020, 236
作者:  Meseguer-Ruiz, Oliver;  Cortesi, Nicola;  Guijarro, Jose A.;  Sarricolea, Pablo
收藏  |  浏览/下载:7/0  |  提交时间:2020/07/02
Weather regimes  Northern Chile  Altiplano  Atacama Desert  Geopotential height  Megadrought  
The role of plume-scale processes in long-term impacts of aircraft emissions 期刊论文
ATMOSPHERIC CHEMISTRY AND PHYSICS, 2020, 20 (9) : 5697-5727
作者:  Fritz, Thibaud M.;  Eastham, Sebastian D.;  Speth, Raymond L.;  Barrett, Steven R. H.
收藏  |  浏览/下载:8/0  |  提交时间:2020/05/20
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.


  
Mutualism increases diversity, stability, and function of multiplex networks that integrate pollinators into food webs 期刊论文
NATURE COMMUNICATIONS, 2020, 11 (1)
作者:  Hale, Kayla R. S.;  Valdovinos, Fernanda S.;  Martinez, Neo D.
收藏  |  浏览/下载:6/0  |  提交时间:2020/05/13
Enhanced ferroelectricity in ultrathin films grown directly on silicon 期刊论文
NATURE, 2020, 580 (7804) : 478-+
作者:  Arnold, Fabian M.;  Weber, Miriam S.;  Gonda, Imre;  Gallenito, Marc J.;  Adenau, Sophia;  Egloff, Pascal;  Zimmermann, Iwan;  Hutter, Cedric A. J.;  Huerlimann, Lea M.;  Peters, Eike E.;  Piel, Joern;  Meloni, Gabriele;  Medalia, Ohad;  Seeger, Markus A.
收藏  |  浏览/下载:49/0  |  提交时间:2020/07/03

Ultrathin ferroelectric materials could potentially enable low-power perovskite ferroelectric tetragonality logic and nonvolatile memories(1,2). As ferroelectric materials are made thinner, however, the ferroelectricity is usually suppressed. Size effects in ferroelectrics have been thoroughly investigated in perovskite oxides-the archetypal ferroelectric system(3). Perovskites, however, have so far proved unsuitable for thickness scaling and integration with modern semiconductor processes(4). Here we report ferroelectricity in ultrathin doped hafnium oxide (HfO2), a fluorite-structure oxide grown by atomic layer deposition on silicon. We demonstrate the persistence of inversion symmetry breaking and spontaneous, switchable polarization down to a thickness of one nanometre. Our results indicate not only the absence of a ferroelectric critical thickness but also enhanced polar distortions as film thickness is reduced, unlike in perovskite ferroelectrics. This approach to enhancing ferroelectricity in ultrathin layers could provide a route towards polarization-driven memories and ferroelectric-based advanced transistors. This work shifts the search for the fundamental limits of ferroelectricity to simpler transition-metal oxide systems-that is, from perovskite-derived complex oxides to fluorite-structure binary oxides-in which '  reverse'  size effects counterintuitively stabilize polar symmetry in the ultrathin regime.


Enhanced switchable ferroelectric polarization is achieved in doped hafnium oxide films grown directly onto silicon using low-temperature atomic layer deposition, even at thicknesses of just one nanometre.


  
Preservation of lateral pressure disequilibrium during the uplift of shale reservoirs 期刊论文
AAPG BULLETIN, 2020, 104 (4) : 825-843
作者:  Xia, Xinyu;  Michael, Eric;  Gao, Yongli
收藏  |  浏览/下载:7/0  |  提交时间:2020/05/13