inscription
PORTAIL D'INFORMATION GÉOGRAPHIQUE

Résultats de la recherche (92 résultats)

Affinez votre recherche

Par Collection Par Auteur Par Date Par Sujet Par Titre
  • Studies of snow accumulation and ablation on perennial snow patches in the mountains of Japan
  • Through a review of research, the A. summarizes the characteristics of snow accumulation and ablation on perennial snow patches in the Japanese mountains.
  • Evaluation of the collection, archiving and publication of daily snow data in the United States
  • Snow is an important component of the earth's environment and can significantly impact the everyday life. The quality of the data varies from one state to another, although it tends to be weakest where snow is least common. As a result
  • of this evaluation, the list of stations with daily snow data published in National Oceanic and Atmospheric Administration Climatological Data publications has been revised and expanded.
  • Depth of snow and forst on a palsa mire, Finnish Lapland
  • Analysis of snow and frost measurements made on a palsa mire in Utsjoki, northernmost Finland from September 1984 to October 1985. Rather good multiple and logarithmic regressions were found between snow and frost depths of March and April
  • The measurement of accumulation rate of snow in the Antarctic with micro-wave remote sensing method.
  • The reason for evaluating the accumulation rate of snow using microwave brightness temperature is explained. The vertical increasing rate of snow grain size will have a significant influence on this temperature. The author demonstrates
  • that there is near linear relationship between vertical increasing rate of snow grain size K'and Tb/T using invariant embedding method to know asymptotic solutions. An empirically derived formula is used to evaluate the accumulation rate for the Antarctica. (TNC).
  • Illustration of the roles of snow in the evolution of the winter cover of a lake
  • Spatial patterns in the snow and ice cover of Elizabeth Lake, Labrador, as surveyed in late February 1979, are displayed and analysed. Relationships between distinct trends in the ice and less distinct trends in the snow are discussed within
  • a context of processes operative during a winter. The nature of and spatial patterns in the winter cover of lakes and their evolution have important implications for those interested in generalizing about lake ice properties and about the effects of snow
  • Causes are examined of formation of various shear-surface shapes of snow samples (even, convex) in determining the snow cover cohesion with the aid of a frame and a dynamometer. It is suggested the snow strength to determine with the aid
  • of a hardness tester but not by a frame. A method is described, and field data are given on measuring the resistance of loose snow to compression. A conclusion is drawn that the snow resistance of loose snow to compression. A conclusion is drawn that the snow
  • Evidence of recent changes in global snow and ice cover in Global Change.
  • Data on recent variations in the seasonal extent of snow cover and sea ice, of the terminal position and volume of alpine glaciers, and of ground temperature profiles in permafrost area are reviewed.
  • The model allows to estimate the time and the position of forming of the depth hoar strates and allows to calculate the snow strength in different layers of snowpack and the variation of snow strength in the process of metamorphism. The suggested
  • thermomechanical model of the snowpack structure formation allows to decide the important problem of the avalanche alarm prognosis with using of the experimental meteo-data from the snow-avalanches station.
  • Principal factors causing avalanches are discussed: topography, meteorology, snow conditions and mechanical factors. The types of crystals forming each layer are of great importance because they relate thermodynamic factors to characteristic snow
  • cover stability factors and determine the state of the snow under varying weather and possible corresponding critical avalanche conditions.
  • Surficial talus fabric and particle gliding over snow on Lassen Peak, California
  • This paper reports on the fabric of experimental clasts initially stopping on snow-covered talus and later deposited on the slope surface after the seasonal shrinking of the snowbank. Its main purpose is to ascertain whether fabrics developed
  • on the snow surface can be retained after ablation onto the underlying talus| the fabrics attained by these particles will also be compared with those of clasts found in situ on a nearby talus.
  • Remote sensing data sets of snow are being studied and refined for input into energy balance, hydrological, and general circulation models. Snow influences the amount of solar energy retained and returned to space, the utilization of radiant energy
  • in the hydrological cycle, and the atmospheric circulation by interacting with and modifying air masses. The continually evolving remote sensing technology will be used to provide a better understanding of how snow cover influences global climate and a better
  • fundamental understanding of snow accumulation and ablation processes.
  • Compiling and solving an equation which takes into account dispersion of the snow cover as well as describes particle coagulation processes and their destruction, an attempt is made to assess the time of arising snow avalanches during a snowfall
  • or immediately after its cessation. Ways are suggested for creation of a calculation method for forecasting snow avalanches from fresh-fallen snow.
  • Glacial morphology and snow-lines of younger Quaternary around the Yari-Hotaka Mountain range, northern Alps, central Japan
  • In this paper, the authors attempt to elucidate the glacial geomorphology to clarify the ages of glacial stages by correlating with some glacial stages in other areas, to study some problems of snow-line reconstruction, and to reconstruct the change
  • of the altitude of snow-line using geomorphological and meteorological data. (L'A.).
  • An Analysis of water flow in dry snow
  • An algorithm for snow and ice detection using AVHRR data. An extension to the Apollo software package in Special issue : Applications of AVHRR data.
  • Multi-spectral classification of snow using NOAA AVHRR imagery in Special issue : Applications of AVHRR data.
  • A comment on enhanced boulder weathering under late-lying snow patches by Ballantyne, C. K., Black, N. M., and Finlay, D. P.
  • Subalpine snow avalanche slopes
  • Snowpack albedo and snow density
  • Compositional differences between Arctic aerosol and snow