The effect of spatially non-uniform water loads on prediction of sea-level change     

Paul Johnston 《Geophysical Journal International》1993,114(3):615-634

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There's a Place For Us     

R. J. Johnston 《New Zealand geographer》1988,44(1):8-13

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Sulfur isotope biogeochemistry of the Proterozoic McArthur Basin     

David T. Johnston  James Farquhar  Yanan Shen  Andrew L. Masterson 《Geochimica et cosmochimica acta》2008,72(17):4278-4290

Previous geochemical and biomarker studies of the late Paleo-Mesoproterozoic propose a stratified world, with strongly reducing (possibly sulfidic) deep-ocean conditions overlain by an oxygenated surface-ocean and atmosphere. To investigate such a scenario, we look to the structure of the biogeochemical sulfur cycle. We present sulfur (³²S, ³³S, ³⁴S, and ³⁶S in sulfides) isotope data from the McArthur Basin (Barney Creek, Reward, Velkerri, and McMinn formations) that allows for a direct evaluation of the surface biosphere. We are interested in investigating the types of information that can be gained by including ³³S and ³⁶S. When the ³⁴S/³²S fractionations are small, the inclusion of ³³S and ³⁶S provides little additional information, but does provide ancillary evidence for relative isotopic homogeneity (with the internal consistency of ³³S/³²S and ³⁶S/³²S). When the ³⁴S/³²S fractionations are large, direct information about the fractionation mechanisms can be obtained, with the potential to distinguish the biological from abiological processes. For example, the reconstruction of the Roper Group suggests that seawater sulfate concentrations were high enough to buffer against spatial heterogeneities. Overall, our findings agree with previously proposed redox structure of the Proterozoic ocean, highlight contributions from the oxidative sulfur cycle, and outline a new tool for interpreting the state of the surface sulfur cycle.  相似文献   

Anisotropy of magnetic susceptibility studies in Tertiary ridge-parallel dykes (Iceland), Tertiary margin-normal Aishihik dykes (Yukon), and Proterozoic Kenora–Kabetogama composite dykes (Minnesota and Ontario)     

John P. Craddock  Bryan C. Kennedy  Avery L. Cook  Melissa S. Pawlisch  Stephen T. Johnston  Mike Jackson 《Tectonophysics》2008,448(1-4):115-124

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Returns from a speculation     

Ron Johnston  Derek Gregory  Geraldine Pratt  Michael Watts  Sarah Whatmore 《Geoforum》2008,39(3):1105-1107

A reply to a recent paper by Setten.  相似文献   

The AUSGeoid98 geoid model of Australia: data treatment, computations and comparisons with GPS-levelling data     

W. E. Featherstone  J. F. Kirby  A. H. W. Kearsley  J. R. Gilliland  G. M. Johnston  J. Steed  R. Forsberg  M. G. Sideris 《Journal of Geodesy》2001,75(5-6):313-330

 The AUSGeoid98 gravimetric geoid model of Australia has been computed using data from the EGM96 global geopotential model, the 1996 release of the Australian gravity database, a nationwide digital elevation model, and satellite altimeter-derived marine gravity anomalies. The geoid heights are on a 2 by 2 arc-minute grid with respect to the GRS80 ellipsoid, and residual geoid heights were computed using the 1-D fast Fourier transform technique. This has been adapted to include a deterministically modified kernel over a spherical cap of limited spatial extent in the generalised Stokes scheme. Comparisons of AUSGeoid98 with GPS and Australian Height Datum (AHD) heights across the continent give an RMS agreement of ±0.364 m, although this apparently large value is attributed partly to distortions in the AHD. Received: 10 March 2000 / Accepted: 21 February 2001  相似文献   

Transport Systems, Policy and Planning: A Geographical Approach     

Doug C. Johnston 《New Zealand geographer》1997,53(1):63-64

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Analytical comparison of geomagnetic total field between Sino-US stations     

Zhijia Zhan  Fuxin Yao  M. Johnston  R. Mueller  Jintian Gao 《地震学报(英文版)》1992,5(4):807-813

Using observational data of geomagnetic total intensity from 13 stations in the Beijing-Tianjin region, 3 stations in the western Yunnan region of China, and 6 stations in California of U. S. A., the daily variations and their spectra of geomagnetic total intensity were analyzed and compared. The results show that the morphology, the range and spectrum of daily variations in geomagnetic total intensity are basically the same within the local extent of 100–200 km and are different in the large extent of 500 km. The latitude factor of the daily variation range of geomagnetic total intensity is about 1–2 nT/degree within the latitude extent of 25°–40°. The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,14, 83–89, 1992. This work is supported by the State Seismological Bureau and the Chinese Joint Seismological Science Foundation, and U.S. Geological Survey.  相似文献   

Fuel moisture sensitivity to temperature and precipitation: climate change implications   总被引：1，自引：0，他引：1  

M. D. Flannigan  B. M. Wotton  G. A. Marshall  W. J. de Groot  J. Johnston  N. Jurko  A. S. Cantin 《Climatic change》2016,134(1-2):59-71

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Continually Changing Human Geography Revisited: David Harvey: Social Justice and the City     

R. J. Johnston 《New Zealand geographer》1974,30(2):180-192

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