Light Scattering and Particle Aggregation in Snow-Storms
Abstract Attenuation of visible radiation by falling snow was studied by a method based on brightness contrast between topographic features and the adjacent sky. Extinction coefficient and visual range are related to bulk snow density, and are compared with data for Antarctic blizzards. Since attenu...
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Cambridge University Press (CUP)
1966
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Online Access: | http://dx.doi.org/10.1017/s0022143000019250 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000019250 |
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crcambridgeupr:10.1017/s0022143000019250 2024-03-03T08:38:34+00:00 Light Scattering and Particle Aggregation in Snow-Storms Mellor, Malcolm 1966 http://dx.doi.org/10.1017/s0022143000019250 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000019250 en eng Cambridge University Press (CUP) Journal of Glaciology volume 6, issue 44, page 237-248 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1966 crcambridgeupr https://doi.org/10.1017/s0022143000019250 2024-02-08T08:41:37Z Abstract Attenuation of visible radiation by falling snow was studied by a method based on brightness contrast between topographic features and the adjacent sky. Extinction coefficient and visual range are related to bulk snow density, and are compared with data for Antarctic blizzards. Since attenuation depends more on the size and concentration of discrete particles than on the mass density of suspended snow, the process of particle aggregation and snow-flake formation during fall is considered by collision theory, and an expression describing aggregation effects is developed. This offers an explanation for the relative constancy of particle concentration observed at ground level during snowfalls of varying intensity. Since there is no strong justification for relating extinction coefficient to snow density, an empirical correlation between extinction coefficient and precipitation rate is given for practical use. It is shown that visual range estimated by eye in hilly terrain may be less than the true value, since sky brightness is locally reduced over broad hill-tops with low albedo. Article in Journal/Newspaper Antarc* Antarctic Journal of Glaciology Cambridge University Press Antarctic Journal of Glaciology 6 44 237 248 |
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Open Polar |
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Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Mellor, Malcolm Light Scattering and Particle Aggregation in Snow-Storms |
topic_facet |
Earth-Surface Processes |
description |
Abstract Attenuation of visible radiation by falling snow was studied by a method based on brightness contrast between topographic features and the adjacent sky. Extinction coefficient and visual range are related to bulk snow density, and are compared with data for Antarctic blizzards. Since attenuation depends more on the size and concentration of discrete particles than on the mass density of suspended snow, the process of particle aggregation and snow-flake formation during fall is considered by collision theory, and an expression describing aggregation effects is developed. This offers an explanation for the relative constancy of particle concentration observed at ground level during snowfalls of varying intensity. Since there is no strong justification for relating extinction coefficient to snow density, an empirical correlation between extinction coefficient and precipitation rate is given for practical use. It is shown that visual range estimated by eye in hilly terrain may be less than the true value, since sky brightness is locally reduced over broad hill-tops with low albedo. |
format |
Article in Journal/Newspaper |
author |
Mellor, Malcolm |
author_facet |
Mellor, Malcolm |
author_sort |
Mellor, Malcolm |
title |
Light Scattering and Particle Aggregation in Snow-Storms |
title_short |
Light Scattering and Particle Aggregation in Snow-Storms |
title_full |
Light Scattering and Particle Aggregation in Snow-Storms |
title_fullStr |
Light Scattering and Particle Aggregation in Snow-Storms |
title_full_unstemmed |
Light Scattering and Particle Aggregation in Snow-Storms |
title_sort |
light scattering and particle aggregation in snow-storms |
publisher |
Cambridge University Press (CUP) |
publishDate |
1966 |
url |
http://dx.doi.org/10.1017/s0022143000019250 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000019250 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Journal of Glaciology |
genre_facet |
Antarc* Antarctic Journal of Glaciology |
op_source |
Journal of Glaciology volume 6, issue 44, page 237-248 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000019250 |
container_title |
Journal of Glaciology |
container_volume |
6 |
container_issue |
44 |
container_start_page |
237 |
op_container_end_page |
248 |
_version_ |
1792506975613878272 |