Results 121 to 130 of about 5,470 (153)

Particle Size Distribution Analysis of Mineral Dust in Polar Snow Using a Coulter Counter

Ocean and Polar Research, 2014
Mineral dust in the polar snow plays an important role both in the climate system of the Earth and in global biogeochemical cycles. Analysis of the concentration and the particle size distribution of mineral dust has been carried out in the snow from the Antarctic surface snow and the Greenland snowpit.
Jung-Ho Kang, Soon Do Hur
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Scattering by densely distributed moderate size particles with size distribution and applications to snow

IEEE 1999 International Geoscience and Remote Sensing Symposium. IGARSS'99 (Cat. No.99CH36293), 2003
The radiative transfer theory has been used to deal with the problems of remote sensing from scattering media. During the past, the dense media radiative transfer theories are mainly based on the Rayleigh approximation which is only valid in the low-frequency limit when the particle size is much smaller than the wavelength.
null Chi-Te Chen, L. Tsang, A.T.C. Chang, null Kung-Hau Ding   +3 more
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Snow Particle Size Spectra in Lake Effect Snows

Journal of Applied Meteorology and Climatology, 1990
Abstract In situ snow particle size spectra measured by Particle Measuring Systems probes near the downwind shore of Lake Michigan during lake-effect snow storms are presented and discussed. Ice water contents ranged from 0.002 to 0.264 g m−3. Concentrations of sizes larger than 1 mm were generally exponentially distributed; however, concentrations of ...
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Estimating snow particle size using TM band-4

Proceedings of IGARSS '94 - 1994 IEEE International Geoscience and Remote Sensing Symposium, 2002
The snowpack parameters are important to climatological and hydrological investigations. Using data acquired with the Landsat Thematic Mapper (TM) over the Oetztal Alps and Wapta, the authors derived snow particle size maps from TM band-4. The information with temporal and spatial variations in snow properties will prove our understanding of the ...
null Jiancheng Shi, J. Dozier
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Snow optical properties for different particle shapes with application to snow grain size retrieval and MODIS/CERES radiance comparison over Antarctica

Remote Sensing of Environment, 2008
Abstract We investigated the single scattering optical properties of snow for different ice particle shapes and degrees of microscopic scale roughness. These optical properties were implemented and tested in a coupled atmosphere-snow radiative transfer model.
, Yu Xie, Zhonghai Jin
exaly   +2 more sources

Snow Particle Size Distribution From a 2-D Video Disdrometer and Radar Snowfall Estimation in East China

IEEE Transactions on Geoscience and Remote Sensing, 2020
In this study, as part of an effort to study snowfall characteristics and quantify winter precipitation in East China, we investigated the microphysical properties of snowfall, including size, shape, density, and terminal velocity using a 2-D video disdrometer (2-DVD) and a weighing precipitation gauge in Nanjing (NJ), East China during the winters of ...
Ranting Tao, Long Wen, Guifu Zhang
exaly   +2 more sources

Measuring particle size and snowfall intensity in drifting snow

Cold Regions Science and Technology, 1984
Abstract Distributions of particle diameters in drifting snow with concurrent snowfall extend to larger sizes and exhibit a tendency to be bimodal compared to distributions in drifting without snowfall. An electronic system provides measures of these distributions that allow precipitation rates to be estimated even with strong transport of snow along
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Estimates of threshold windspeed from particle sizes in blowing snow

Cold Regions Science and Technology, 1981
Abstract Particle size distributions measured in the saltation layer of drifting snow are fitted reasonably well by the two-parameter gamma function. Using these data, the mean particle size 0.25 m above the surface is predicted as a function of windspeed, from the theoretical relationship developed by Budd (1966).
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Improving shape-dependent snow fall speed relationships using different particle size parameters

2023
Meteorological forecast models, notably snowfall predictions, require accurate knowledge of the properties of snow particles, such as their size, cross-sectional area, mass, shape, and fall speed. Therefore, measurements of individual snow particles’ fall speed and their cross-sectional area, from which a size parameter and area ratio can be ...
Thomas Kuhn, Salomon Eliasson, Sandra Vázquez-Martín   +2 more
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Recent seasonal changes of metal composition and size distribution of mineral particles in snow at EGRIP, Greenland

2021
<p>Seasonal changes of meteorological and ground surface conditions can cause seasonal changes of source area of mineral particles supplied to the Greenland ice sheet. Difference in metal composition and size distribution of them reflects their source area difference. To clarify seasonal changes in the source area of mineral particles, we
Yuki Komuro, Fumio Nakazawa, Kumiko Goto-Azuma, Motohiro Hirabayashi, Wataru Shigeyama, Naoko Nagatsuka   +5 more
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