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TABLE OF CONTENTS
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April 2017 Volume 10, Issue 4 |
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| Editorial Correspondence News and Views Perspective Articles | |
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Editorial | Top |
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To probe a core p241 doi:10.1038/ngeo2935 Hidden under many kilometres of silicate mantle material, the cores of Earth and other planets are hard to investigate. The Psyche spacecraft, designed to visit a metal body that may be a core stripped of its mantle, could bring a close-up view. |
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Correspondence | Top |
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Limited Late Antique cooling pp242 - 243 Samuli Helama, Phil D. Jones & Keith R. Briffa doi:10.1038/ngeo2926 See also: Letter by Buntgen et al. | Correspondence by Buntgen et al. |
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Reply to 'Limited Late Antique cooling' p243 Ulf Buntgen, Vladimir S. Myglan, Fredrik Charpentier Ljungqvist, Michael McCormick, Nicola Di Cosmo et al. doi:10.1038/ngeo2927 See also: Correspondence by Helama et al. |
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News and Views | Top |
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Perspective | Top |
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Complexity in estimating past and future extreme short-duration rainfall pp255 - 259 Xuebin Zhang, Francis W. Zwiers, Guilong Li, Hui Wan & Alex J. Cannon doi:10.1038/ngeo2911 The atmosphere can hold more water in a warming climate, which may lead to more extreme rainfall events. An analysis suggests that links ofrainfall extremes with daily temperature variations do not provide a reliable basis for projections. |
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Articles | Top |
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Electrification of sand on Titan and its influence on sediment transport pp260 - 265 J. S. Mendez Harper, G. D. McDonald, J. Dufek, M. J. Malaska, D. M. Burr et al. doi:10.1038/ngeo2921 Frictional charging of granular materials may readily occur on Saturn's moon Titan. Laboratory experiments under Titan-like conditions suggest that the resulting electrostatic forces are strong enough to affect sand transport on Titan. |
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An ongoing satellite-ring cycle of Mars and the origins of Phobos and Deimos pp266 - 269 Andrew J. Hesselbrock & David A. Minton doi:10.1038/ngeo2916 The moon Phobos is spiralling inwards towards its disintegration to eventually form a ring around Mars from which new moons may form. Simulations suggest that this is just the latest of multiple ring-moon cycles over the history of Mars. |
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Formation of recurring slope lineae on Mars by rarefied gas-triggered granular flows pp270 - 273 Frédéric Schmidt, François Andrieu, François Costard, Miroslav Kocifaj & Alina G. Meresescu doi:10.1038/ngeo2917 Transient streaks on Martian slopes have been attributed to liquid water. Simulations show that a dry avalanche process involving the flow of gas in the Martian soil due to temperature contrasts can instead explain these recurring features. |
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Smaller desert dust cooling effect estimated from analysis of dust size and abundance pp274 - 278 Jasper F. Kok, David A. Ridley, Qing Zhou, Ron L. Miller, Chun Zhao et al. doi:10.1038/ngeo2912 The radiative effect of desert dust depends in part on its size. An integrative analysis of observed and modelled dust size and abundance reveals that atmospheric dust is coarser, and less cooling, than previously thought. See also: News and Views by Ginoux |
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Globally important nitrous oxide emissions from croplands induced by freeze-thaw cycles pp279 - 283 Claudia Wagner-Riddle, Katelyn A. Congreves, Diego Abalos, Aaron A. Berg, Shannon E. Brown et al. doi:10.1038/ngeo2907 Large fluxes of nitrous oxide occur when frozen soils thaw. Field measurements and mathematical models suggest that freeze-thaw events are responsible for 17 to 28% of nitrous oxide emitted from agricultural soils globally. See also: News and Views by Butterbach-Bahl & Wolf |
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Sensitivity of grassland productivity to aridity controlled by stomatal and xylem regulation pp284 - 288 A. G. Konings, A. P. Williams & P. Gentine doi:10.1038/ngeo2903 Grass species vary in their regulation of water use. Remote-sensing data reveal that productivity is more sensitive to atmospheric moisture than precipitation deficits, especially in grasslands where plants loosely regulate water use. |
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Mobility and persistence of methane in groundwater in a controlled-release field experiment pp289 - 294 Aaron G. Cahill, Colby M. Steelman, Olenka Forde, Olukayode Kuloyo, S. Emil Ruff et al. doi:10.1038/ngeo2919 Most monitoring of methane well leakage focuses on emissions of methane gas to the atmosphere. In a controlled-release field experiment, significant methane also persisted in aquifer groundwater due to lateral migration along bedding planes. |
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A lower limit to atmospheric CO2 concentrations over the past 800,000 years pp295 - 298 E. D. Galbraith & S. Eggleston doi:10.1038/ngeo2914 Atmospheric CO2 levels varied across glacial-interglacial cycles. An analysis of ice-core CO2 identifies a lower limit to glacial CO2 concentrations, which may reflect a negative biosphere feedback to decreasing CO2 levels. |
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Tremor-rich shallow dyke formation followed by silent magma flow at Bárðarbunga in Iceland pp299 - 304 Eva P. S. Eibl, Christopher J. Bean, Kristin S. Vögfjord, Yingzi Ying, Ivan Lokmer et al. doi:10.1038/ngeo2906 Magma movement is thought to trigger volcanic tremor. However, analysis of seismic data suggests that tremor prior to the Barðarbunga eruption in Iceland instead marked the crust cracking open, whereas subsequent magma flow was seismically silent. |
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Record of modern-style plate tectonics in the Palaeoproterozoic Trans-Hudson orogen pp305 - 311 O. M. Weller & M. R. St-Onge doi:10.1038/ngeo2904 The timing of onset of modern-style plate tectonics on Earth is unclear. Identification of eclogite rocks—typically formed during subduction—in the Trans-Hudson orogen implies modern-style tectonics may have been active 1,830 million years ago. See also: News and Views by Warren |
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Stabilization of body-centred cubic iron under inner-core conditions pp312 - 316 Anatoly B. Belonoshko, Timofei Lukinov, Jie Fu, Jijun Zhao, Sergio Davis et al. doi:10.1038/ngeo2892 The crystal structure of iron under the extreme pressures and temperatures of Earth's core is debated. Numerical simulations suggest that the body-centred cubic structure of iron is stable under inner-core conditions. |
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Non-chondritic iron isotope ratios in planetary mantles as a result of core formation pp317 - 321 Stephen M. Elardo & Anat Shahar doi:10.1038/ngeo2896 Planetary materials reveal variation in iron isotope composition across planetary bodies. Experiments suggest that this variation can be explained by varying degrees of fractionation during core formation, depending on temperature. See also: News and Views by Sossi |
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