New Data on the Chronostratigraphy of the Upper Pleistocene Loess–Soil Series in Southwestern Siberia     

Zykina  V. S.  Zykin  V. S.  Volvakh  N. Ye.  Volvakh  A. O.  Murray  A. S.  Taratunina  N. A.  Kurbanov  R. N. 《Doklady Earth Sciences》2021,500(2):870-874

Doklady Earth Sciences - We have analyzed the modern status of the chronostratigraphic differentiation of the loess–paleosoil series in southwestern Siberia and the results of luminescence...  相似文献   

Luminescence dating of Pleistocene alluvial sediments affected by the Alhama de Murcia fault (eastern Betics,Spain) – a comparison between OSL,IRSL and post‐IR IRSL ages     

Reza Sohbati  Andrew S. Murray  Jan‐Pieter Buylaert  Maria Ortuño  Pedro P. Cunha  Eulàlia Masana 《Boreas: An International Journal of Quaternary Research》2012,41(2):250-262

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Sensitivity of crop yields and land resource potential to climatic change in Ontario,Canada     

Barry Smit  Michael Brklacich  Robert B. Stewart  Ray McBride  Murray Brown  Deborah Bond 《Climatic change》1989,14(2):153-174

Increasing concentrations of atmospheric CO₂ and other greenhouse gases are expected to contribute to a global warming. This paper examines the potential implications of a climatic change corresponding to a doubling of atmospheric concentrations of CO₂ on crop production opportunities throughout Ontario, a major food producing region in Canada. The climate is projected to become warmer and drier, but the extent of these shifts are expected to vary from region to region within Ontario. The effect of this altered climate on crop yields and the area of land capable of supporting specific crops varies according to region, soil quality and crop type. Most notable are the enhanced opportunities for grains and oilseeds in the northern regions, and the diminished production prospects for most crops in the most southerly parts of Ontario.  相似文献   

Development of a rainwater harvesting system for increasing soil moisture in arid rangelands of Pakistan     

Sheikh Suleman  M. Karl Wood  Bashir Hussain Shah  Leigh Murray   《Journal of Arid Environments》1995,31(4)

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Bioconcentration factors for petroleum hydrocarbons, PAHs, LABs and biogenic hydrocarbons in the blue mussel     

A.P Murray  B.J Richardson  C.F Gibbs 《Marine pollution bulletin》1991,22(12):595-603

Bioconcentration factors (K_bc) for petroleum hydrocarbons, PAHs, LABs and biogenic hydrocarbons in Mytilus edulis were measured in field experiments using time-integrating water samplers. Seven deployments at five sites gave lipid weight K_bcs for total hydrocarbons ranging from 0.99 × 10⁶ to 3.1 × 10⁶ (mean 1.6 × 10⁶)—a narrower range than has been obtained previously. Bioconcentration factors for the PAHs were similar to those for total hydrocarbons where the major hydrocarbon source was oil. However, at other sites the factors for PAHs were an order of magnitude lower than those for petroleum and for hydrocarbons originating from algae. Compositional profiles for the linear alkyl benzenes (LABs) suggested that these compounds were assimilated primarily from the dissolved phase, despite their greater abundance on particles.  相似文献   

Nutrient pore water chemistry,Great Bay,New Hampshire: Benthic fluxes     

William Berry Lyons  Theodore C. Loder  Susan M. Murray 《Estuaries and Coasts》1982,5(3):230-233

Benthic fluxes of C, N, P and Si have been measured at two sites in Great Bay Estuary, New Hampshire. Higher fluxes of reactive phosphate, nitrate and reactive silicate were observed at the site where bioturbation is known to occur and the fluxes of NH₄ ⁺, PO₄ ^?3 and reactive silicate at this location were from 3 to 6 times higher than that calculated by simple pore water diffusion models. *** DIRECT SUPPORT *** A01BY019 00010  相似文献   

The oxidation states of cobalt and selected metals in Pacific ferromanganese nodules     

J.G. Dillard  D.L. Crowther  J.W. Murray 《Geochimica et cosmochimica acta》1982,46(5):755-759

A study of the oxidation states of metals in selected Pacific ferromanganese nodules by x-ray photoelectron spectroscopy (XPS) indicates the presence of Co(III), Pb(II), Pb(IV), Fe(III) and Ti(IV). These findings are based on measurements of core electron binding energies and an evaluation of the core electron shake-up satellite features.  相似文献   

The surface chemistry of δMnO2 in major ion sea water     

L.S Balistrieri  J.W Murray 《Geochimica et cosmochimica acta》1982,46(6):1041-1052

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Reducing model complexity for explanation and prediction   总被引：1，自引：1，他引：1  

A. Brad Murray   《Geomorphology》2007,90(3-4):178

Numerical models can be useful for explaining poorly understood phenomena or for reliable quantitative predictions. When modeling a multi-scale system, a ‘top-down’ approach—basing models on emergent variables and interactions, rather than explicitly on the much faster and smaller scale processes that give rise to them—facilitates both goals. Parameterizations representing emergent interactions range from highly simplified and abstracted to more quantitatively accurate. Empirically based large-scale parameterizations lead more reliably to accurate large-scale behavior than do parameterizations of much smaller scale processes. Conversely, purposefully simplified representations of model interactions can enhance a model's utility for explanation, clarifying the key feedbacks leading to an enigmatic behavior. For such potential insights to be relevant, the interactions in the model need to correspond to those in the ‘real’ system in some straightforward way. Such a correspondence usually holds for models constructed for predictive purposes, although this is not a requirement. The goals motivating a modeling endeavor help determine the most appropriate modeling strategies, as well as the most appropriate criteria for judging model usefulness.  相似文献   

Characterizing groundwater flow in a faulted karst system using optical brighteners from septic systems as tracers     

K. E. Murray  D. R. Straud  W. W. Hammond 《Environmental Geology》2007,53(4):769-776

This study used optical brighteners (OB) released from septic systems to show that groundwater flow direction is largely controlled by the structural framework in a faulted karst groundwater system. Effective protection of groundwater resources requires that groundwater systems are adequately characterized and source water protection areas (SWPA) are developed for drinking water wells. Karst aquifers are among the most sensitive to contamination due to high recharge rates, and among the most difficult aquifers to characterize due to heterogeneity, and anisotropy. Because septic systems may be used to treat wastewater within SWPAs for karst aquifers there is a need to characterize these groundwater systems using tracers. The objective of this study was to characterize groundwater flow in a faulted portion of the Edwards aquifer in Bexar County, Texas using OB that are released as incidental tracers from septic systems. This study included measurement of water levels, sampling of groundwater and surface water, analysis for OB, and spatial analysis in a GIS. Results show that OB intensities were highest to the southwest of the septic area, a direction that is sub-parallel to the fault and fracture orientation and nearly perpendicular to the hydraulic gradient. This indicates that movement of OB, solutes, or non-aqueous liquids/solids in a faulted karst system can be largely controlled by fault/fracture orientation and structural relay ramps.  相似文献