深海碎屑岩层序地层学50年(1970—2020)重要进展     

龚承林  Ronald J.Steel  彭旸  王英民  李东伟 《沉积学报》2022,40(2):292-318

层序地层学是当前地球科学研究颇为关注的领域,被广泛应用于沉积盆地分析和油气勘探.碎屑岩层序地层学理论方法源于海相盆地,是在被动大陆边缘油气勘探实践的基础上凝练而来的,至今已经历了约50年的发展历程.本文梳理了深海碎屑岩层序过去50年发展历程中的重要进展(包括1970—2000年的经典海相碎屑岩层序地层学、2000—20...  相似文献   

Distinguishing breeding populations of mallards (Anas platyrhynchos) using trace elements     

Bindu Kaimal  Ronald Johnson  Robyn Hannigan 《Journal of Geochemical Exploration》2009

The knowledge of connectivity among breeding and overwintering populations of migratory bird species is critical for the conservation of their habitats. Conventional field work for the tracking of migratory birds involving bird banding often yields poor results due to low recovery rates, or is expensive when satellite tracking methods are used. Intrinsic tools such as genetic markers, stable isotopes, strontium isotopes and trace elements have been successfully used for tracing origins and/or migratory pathways of bird populations. We studied elemental signatures in the tail feathers to group breeding populations and an overwintering population of Mallards (Anas platyrhynchos). Tail feathers from five locations in Canada and the U.S. were analyzed using Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry (LA-ICP-MS). We used 18 elements to discriminate between Mallard populations. Linear discriminant analysis on a selected set of elements demonstrated that 93% of the Mallards could be accurately located back to their predicted locations. Mallard feathers from Arkansas (an important overwintering area), grouped together with any combination of elements as predictors. We predicted the breeding locations of overwintering Mallards from Arkansas. Our results confirm that the LA-ICP-MS technique shows high potential to estimate the origin of migratory animals.  相似文献   

Model prediction capacity of ephemeral gully evolution in conservation tillage systems     

Eduardo Luquin  Miguel A. Campo-Bescós  Rafael Muñoz-Carpena  Ronald L. Bingner  Richard M. Cruse  Henrique G. Momm  Robert R. Wells  Javier Casalí 《地球表面变化过程与地形》2021,46(10):1909-1925

Ephemeral gully (EG) erosion has an important impact on agricultural soil losses and increases field surface hydrology connectivity and transport of pollutants to nearby water bodies. Watershed models including an EG component are scarce and not yet properly evaluated. The objective of this study is to evaluate the capacity of one such tool, AnnAGNPS, to simulate the evolution of two EG formed in a conservation tillage system. The dataset for model testing included runoff measurements and EG morphological characteristics during 3 years. Model evaluation focused on EG evolution of volume, width, and length model outputs, and included calibration and testing phases and a global sensitivity analysis (GSA). While the model did not fully reproduce width and length, the model efficiency to simulate EG volume was satisfactory for both calibration and testing phases, supporting the watershed management objectives of the model. GSA revealed that the most sensitive factors were EG depth, critical shear stress, headcut detachment exponent coefficient b, and headcut detachment leading coefficient a. For EG outputs the model was additive, showing low sensitivity to interactions between the inputs. Prediction of EG spatial evolution on conservation tillage systems requires improved development of gully erosion components, since many of the processes were developed originally for traditional tillage practices or larger channel systems. Our results identify the need for future research when EG form within conservation tillage systems, in particular to study gully headcut, soil erodibility, and width functions specific to these practices.  相似文献   

Detection of C₂HD and the D/H ratio on Titan     

Athena Coustenis  Donald E. Jennings  Yves Bénilan  Sandrine Vinatier  Gordon L. Bjoraker  Ronald C. Carlson 《Icarus》2008,197(2):539-548

We report here the first detection of mono-deuterated acetylene (acetylene-d1, C₂HD) in Titan's atmosphere from the presence of two of its emission bands at 678 and 519 cm⁻¹ as observed in CIRS spectral averages of nadir and limb observations taken between July 2004 and mid-2007. By using new laboratory spectra for this molecule, we were able to derive its abundance at different locations over Titan's disk. We find the C₂HD value () to be roughly constant with latitude from the South to about 45° N and then to increase slightly in the North, as is the case for C₂H₂. Fitting the 678 cm⁻¹ν₅ band simultaneously with the nearby C₂H₂ 729 cm⁻¹ν₅ band, allows us to infer a D/H ratio in acetylene on Titan with an average of the modal values of 2.09±0.45×¹⁰⁻⁴ from the nadir observations, the uncertainties being mainly due to the vertical profile used for the fit of the acetylene band. Although still subject to significant uncertainty, this D/H ratio appears to be significantly larger than the one derived in methane from the CH₃D band (upper limit of 1.5×¹⁰⁻⁴; Bézard, B., Nixon, C.A., Kleiner, I., Jennings, D.E., 2007. Icarus, 191, 397-400; Coustenis, A., Achterberg, R., Conrath, B., Jennings, D., Marten, A., Gautier, D., Bjoraker, G., Nixon, C., Romani, P., Carlson, R., Flasar, M., Samuelson, R.E., Teanby, N., Irwin, P., Bézard, B., Orton, G., Kunde, V., Abbas, M., Courtin, R., Fouchet, Th., Hubert, A., Lellouch, E., Mondellini, J., Taylor, F.W., Vinatier, S., 2007. Icarus 189, 35-62). From the analysis of limb data we infer D/H values of (at 54° S), (at 15° S), (at 54° N) and (at 80° N), which average to a mean value of 1.63±0.27×¹⁰⁻⁴.  相似文献   

Plant Genetics,Ecologically Based Farming and the Future of Food          下载免费PDF全文

Pamela C. Ronald 《Geographical review》2017,107(4):559-566

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Applying Geography Course Projects to Issues in City Resilience and Global Connectivity     

Ronald V. Kalafsky  Helen M. Rosko 《The Journal of geography》2017,116(2):67-78

Globalization would appear to be a subject that easily could be addressed in geography classrooms, yet this is not always the case. In terms of pedagogy, many geographers are concerned whether the field has been adequately engaging various components of this topic (e.g., connectivity, core-periphery), especially in terms of making the subject matter relevant to students. This article presents the results of a recent course project situated at the intersection of city-level resilience to hazards and connectivity with the global economy, utilizing SWOT analysis. The student projects demonstrated that this comparatively simple analytical tool was a useful means for exploring and integrating key topics in globalization and urban-economic geography, while also facilitating a problem-based learning environment.  相似文献   

Spatial and Temporal Patterns Associated with Permitted Tree Removal in Austin,Texas, 2002–2011     

Brendan L. Lavy  Ronald R. Hagelman III 《The Professional geographer》2017,69(4):539-552

A wide-ranging set of physical, urban, demographic, socioeconomic, and policy characteristics determines the spatial distribution of urban forests. Information on the characteristics surrounding tree removals on both public and private properties has received less attention in the literature. The purpose of this research was to analyze the spatiotemporal trends and geographic patterns of tree removals in Austin, Texas, between 2002 and 2011 in an effort to understand how site-specific characteristics influence urban tree removal and affect the overall distribution of Austin's urban forest. We examined permitted tree removals using a geographic information system (GIS) as well as spatial and statistical analyses. Specifically, we evaluated the degree to which variables related to various physical, urban, and socioeconomic conditions predicted tree removals. The results indicate that permitted tree removals and their associated characteristics in Austin have varied over the ten-year study period. Permitted tree removals increased over the study period and took place in the urban core and along the urban periphery. Permitted tree removals were more likely to be undertaken by college graduates and owner-occupants and to occur in more densely populated areas, closer to major streets, and on properties with older structures. The results of this research provide urban forest professionals with information on the location and intensity of permitted tree removals and the significant characteristics driving urban tree loss.  相似文献   

Japan’s urban singles: negotiating alternatives to family households and standard housing pathways     

Richard Ronald  Oana Druta  Maren Godzik 《Urban geography》2018,39(7):1018-1040

In comparison to other advanced economies, the rise of people living alone in Japan has been late and rapid, with singletons now accounting for almost half of all households in major cities. The normative and structural frameworks surrounding standard family-household formation, however, remain formidable, reducing life-course opportunities for non-family formers. This paper considers the household and housing pathways being negotiated by younger-adults living independently. In addition to various secondary data sources, we draw on qualitative interviews with 35 individuals from 28 Tokyo households in addressing manifestations of, and resistance to, atomisation and individualisation in the Japanese context. Our analysis focuses on meanings and practices of homemaking among renters and buyers in the growing sector of single-person dwellings, as well as the recent emergence of commercial shared housing . This analysis provides a contrast to discourses surrounding the “singles boom” and “the growing appeal of living alone” in Western cities.  相似文献   

The new hominid skeleton from Sterkfontein,South Africa: age and preliminary assessment     

Timothy C. Partridge  John Shaw  David Heslop  Ronald J. Clarke 《第四纪科学杂志》1999,14(4):293-298

A new hominid skeleton from Sterkfontein Member 2 attaches to foot bones recovered from loose blocks during the 1980s and first described in 1995. Several flowstone horizons are present above and below the skeleton and have given clear palaeomagnetic signatures. Five changes in magnetic polarity have been identified; when constrained by the available biostratigraphy, this sequence can be placed confidently between 3.22 and 3.58 Ma. Interpolation of sedimentation rates over the small intervals between reversals allows this range to be reduced to 3.30–3.33 Ma. The skeleton is thus the oldest yet discovered and is considered to belong to a species of Australopithecus other than africanus. Copyright © 1999 John Wiley & Sons, Ltd.  相似文献   

Probabilistic domain decomposition for the solution of the two-dimensional magnetotelluric problem     

Alexander Bihlo  Colin G. Farquharson  Ronald D. Haynes  J Concepción Loredo-Osti 《Computational Geosciences》2017,21(1):117-129

Probabilistic domain decomposition is proposed as a novel method for solving the two-dimensional Maxwell’s equations as used in the magnetotelluric method. The domain is split into non-overlapping sub-domains and the solution on the sub-domain boundaries is obtained by evaluating the stochastic form of the exact solution of Maxwell’s equations by a Monte-Carlo approach. These sub-domains can be naturally chosen by splitting the sub-surface domain into regions of constant (or at least continuous) conductivity. The solution over each sub-domain is obtained by solving Maxwell’s equations in the strong form. The sub-domain solver used for this purpose is a meshless method resting on radial basis function-based finite differences. The method is demonstrated by solving a number of classical magnetotelluric problems, including the quarter-space problem, the block-in-half-space problem and the triangle-in-half-space problem.  相似文献