Robustness,uncertainties, and emergent constraints in the radiative responses of stratocumulus cloud regimes to future warming   总被引：1，自引：0，他引：1  

Yoko Tsushima  Mark A. Ringer  Tsuyoshi Koshiro  Hideaki Kawai  Romain Roehrig  Jason Cole  Masahiro Watanabe  Tokuta Yokohata  Alejandro Bodas-Salcedo  Keith D. Williams  Mark J. Webb 《Climate Dynamics》2016,46(9-10):3025-3039

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Monazite U–Th–Pb EPMA and zircon U–Pb SIMS chronological constraints on the tectonic,metamorphic, and thermal events in the inner part of the Variscan orogen,example from the Sioule series,French Massif Central     

Damien Do Couto  Michel Faure  Romain Augier  Alain Cocherie  Philippe Rossi  Xian-Hua Li  Wei Lin 《International Journal of Earth Sciences》2016,105(2):557-579

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山东玲珑花岗质杂岩体三维形态的重力模拟   总被引：1，自引：0，他引：1  

曾华霖  万天丰  Teyssier Christian 《地球科学》1999,24(6):607-612

根据胶东地区西北部的重力资料,并在地质资料的约束下,采用人－机联作用的和二维模拟方法,对玲珑花岗质杂岩体三维形态进行了细致的推断,布格重科与地质图的对比表明,本区的局部重力由玲珑花岗质岩体引起的,根据花岗岩体的二维特征,在其露头范围内,垂直其走向,选择一些均匀分布的重力剖面,以花岗岩露头位置作为其形态的地面约束,采用 －机联作的二维重力模拟方法, 出了岩体的断面形态综合这 断面图,便可描述花岗体的  相似文献   

山东玲珑花岗质岩体侵位机制   总被引：10，自引：3，他引：7  

万天丰  C. Teyssier  曾华霖  周伟新  B. Tikoff 《中国科学D辑》2000,30(4)

玲珑花岗质复式岩体位于山东半岛西北部,为一著名的中侏罗世侵入岩体．重力异常的反演模拟证明该岩体为一席状岩基,厚度小于 １０ ｋｍ,缓倾于中国东部郯庐断裂带之下．由野外面理研究和岩体磁各向异性的研究所获得的磁面理与磁线理资料表明,面理在岩体中部主要是缓倾斜的,磁线理主要是平行于朝着郯庐断裂的岩体的倾向分布,线理的定向是岩浆在沿边掩断层流动升到浅部的过程中形成的．据推断玲珑复式岩体可能是郯庐断裂内地壳局部熔融而成的,岩浆沿一条缓倾斜的部庐分支断裂而向上侵位,以张性岩墙扩展式为其主要的侵位机制．  相似文献   

Regional watershed characterization and classification with river network analyses   总被引：1，自引：0，他引：1       下载免费PDF全文

Cédric Gaucherel  Romain Frelat  Ludovic Salomon  Bastien Rouy  Neha Pandey  Christophe Cudennec 《地球表面变化过程与地形》2017,42(13):2068-2081

In order to understand and manage a hydrological region, one usually needs to comprehensively characterize the watersheds (basins) and their river networks. This usually and primarily involves analysis of hydrological and geomorphological properties of the watershed derived from the digital terrain model (DTM), but this approach neglects the information content of the associated river networks. In this study, we used a combination of traditional DTM and original river network‐related indices to the watersheds of an understudied region, Haiti. We also used Monte Carlo simulations to estimate index confidence levels of these indices. Compared to commonly used indices, the network indices provided valuable information that could then be used in statistical analyses as a way to identify the dominant features of the country's watershed morphology. On this basis, we identified four watershed groups in Haiti: (i) high, elongated watersheds, (ii) lowlands, with sinuous networks and relatively slow runoff, (iii) high watersheds with dendritic networks, and (iv) lowlands with high downstream–upstream contrast in properties and rapid runoffs. We argue that river network features provide complementary information in terms of flow topology, highly relevant to characterize contrasting relief countries, such as Haiti. Hence, more exhaustive characterization of watersheds would predictably benefit from the approach outlined in this paper. Copyright © 2017 John Wiley & Sons, Ltd.  相似文献   

Advantages and challenges of using soil water isotopes to assess groundwater recharge dominated by snowmelt at a field study located in Canada     

Romain Chesnaux  Christine Stumpp 《水文科学杂志》2018,63(5):679-695

Seasonal signals of stable isotopes in precipitation, combined with measurements of isotope ratios in soil water, can be used for quantitative estimation of groundwater recharge rates. This study investigates the applicability of using the piston flow principle and the peak shift displacement method to estimate actual groundwater recharge rates in a humid Nordic region located in the province of Quebec, Canada. Two different sites with and without vegetation (C1 and C2) in an unconfined aquifer were tested by measuring soil water isotope ratios (¹⁸O/¹⁶O and ²H/¹H) and volumetric pore water content. Core samples were obtained along the vadose zone down to the groundwater table at the two sites (2.45 m for Site C1 and 4.15 m for Site C2). The peak shift method to estimate groundwater recharge rates was shown to be accurate only in certain specific conditions inherent to the soil properties and the topographical situation of the investigated sites. Indeed, at Site C2, recharge from the snowmelt could not be estimated because of heterogeneity in the lower part of the vadose zone. At this same site the later recharge after the snowmelt (in the period from late spring to early autumn) could be estimated accurately because the upper part of the vadose zone was homogeneous. Furthermore, at site C1, runoff/runon phenomena hampered calculations of actual infiltration and thus produced inaccurate results for recharge. These two different site effects (heterogeneity in the first site and runoff/runon in the other site) were identified as being limiting factors in the accurate assessment of actual recharge. This study therefore recommends the use of the peak shift method for (1) humid Nordic regions, (2) homogeneous and thick vadose zones, and (3) areas with few or limited site effects (runoff/runon).  相似文献   

Effect of Biochar and Amendments on Pb and As Phytotoxicity and Phytoavailability in a Technosol     

Romain Nandillon  Florie Miard  Manhattan Lebrun  Marie Gaillard  Stphane Sabatier  Sylvain Bourgerie  Fabienne Battaglia‐Brunet  Domenico Morabito 《洁净——土壤、空气、水》2019,47(3)

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Surface exposure dating and geophysical prospecting of the Holocene Lauvitel rock slide (French Alps)     

Romain Delunel  Didier Hantz  Régis Braucher  Didier L. Bourlès  Philippe Schoeneich  Jacques Deparis 《Landslides》2010,7(4):393-400

Large rock falls and rockslides represent a risk for human communities in mountainous areas as they can cause fatalities and destruction of settlements and infrastructures. Assessing the associated hazard requires constraining the time frequency of such events. Since large rockslides are not common, estimating their frequency requires recording them over a long period of time. The Holocene period then appears as pertinent, which implies that rockslide features have to be dated with absolute chronology methods. This paper presents a characterisation and dating of the Lauvitel rockslide, one of the largest Holocene rockslides in the French Alps. Combining field observation with electrical tomography profiles performed on the rockslide deposit that constitutes the Lauvitel Lake dam allows estimating its volume at a minimum of 12?×?10⁶?m³. In addition, cosmic ray exposure dating using in situ-produced ¹⁰Be concentration measurements has been applied to date seven samples collected both on the main sliding surface and on blocks lying on the dam and further downstream. Ages obtained are consistent with a single large rockslide event, which occurred at 4.7?±?0.4 ¹⁰Be-ka and formed two distinct deposits. However, from a mechanical point of view, these clearly separated deposits could hardly result from a single movement. A comparison of their reach angles with those reviewed in the literature highlights that the lower deposit must result from rock avalanches larger than 10⁷?m³, while the upper one (the Lauvitel dam) must result from several events smaller than 10⁶?m³. In the context of hazard assessment for land use planning, these events can, however, be considered as a unique event.  相似文献   

FAst STatistics for weak Lensing (FASTLens): fast method for weak lensing statistics and map making     

S. Pires  J.-L. Starck  A. Amara  R. Teyssier  A. Réfrégier  J. Fadili 《Monthly notices of the Royal Astronomical Society》2009,395(3):1265-1279

With increasingly large data sets, weak lensing measurements are able to measure cosmological parameters with ever-greater precision. However, this increased accuracy also places greater demands on the statistical tools used to extract the available information. To date, the majority of lensing analyses use the two-point statistics of the cosmic shear field. These can be either studied directly using the two-point correlation function or in Fourier space, using the power spectrum. But analysing weak lensing data inevitably involves the masking out of regions, for example to remove bright stars from the field. Masking out the stars is common practice but the gaps in the data need proper handling. In this paper, we show how an inpainting technique allows us to properly fill in these gaps with only   N log  N   operations, leading to a new image from which we can compute straightforwardly and with a very good accuracy both the power spectrum and the bispectrum. We then propose a new method to compute the bispectrum with a polar fft algorithm, which has the main advantage of avoiding any interpolation in the Fourier domain. Finally, we propose a new method for dark matter mass map reconstruction from shear observations, which integrates this new inpainting concept. A range of examples based on 3D N -body simulations illustrates the results.  相似文献   

Hot orogens     

Dominique Chardon  Guest editor  Patrice Rey  Guest editor  Christian Teyssier  Guest editor  Donna L. Whitney  Guest editor 《Tectonophysics》2009,477(3-4):103

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