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  1. 防災科研関係論文

Snow particles extracted from X-ray computed microtomography imagery and their single-scattering properties

https://nied-repo.bosai.go.jp/records/4293
https://nied-repo.bosai.go.jp/records/4293
b747515b-80a7-4e41-aad5-09761994d2db
Item type researchmap(1)
公開日 2023-04-27
タイトル
言語 en
タイトル Snow particles extracted from X-ray computed microtomography imagery and their single-scattering properties
言語
言語 eng
著者 Hiroshi Ishimoto

× Hiroshi Ishimoto

en Hiroshi Ishimoto

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Satoru Adachi

× Satoru Adachi

en Satoru Adachi

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Satoru Yamaguchi

× Satoru Yamaguchi

en Satoru Yamaguchi

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Tomonori Tanikawa

× Tomonori Tanikawa

en Tomonori Tanikawa

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Teruo Aoki

× Teruo Aoki

en Teruo Aoki

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Kazuhiko Masuda

× Kazuhiko Masuda

en Kazuhiko Masuda

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抄録
内容記述タイプ Other
内容記述 Sizes and shapes of snow particles were determined from X-ray computed microtomography (micro-CT) images, and their single-scattering properties were calculated at visible and near-infrared wavelengths using a Geometrical Optics Method (GOM). We analyzed seven snow samples including fresh and aged artificial snow and natural snow obtained from field samples. Individual snow particles were numerically extracted, and the shape of each snow particle was defined by applying a rendering method. The size distribution and specific surface area distribution were estimated from the geometrical properties of the snow particles, and an effective particle radius was derived for each snow sample. The GOM calculations at wavelengths of 0.532 and 1.242 µm revealed that the realistic snow particles had similar scattering phase functions as those of previously modeled irregular shaped particles. Furthermore, distinct dendritic particles had a characteristic scattering phase function and asymmetry factor. The single-scattering properties of particles of effective radius reff were compared with the size-averaged single-scattering properties. We found that the particles of reff could be used as representative particles for calculating the average single-scattering properties of the snow. Furthermore, the single-scattering properties of the micro-CT particles were compared to those of particle shape models using our current snow retrieval algorithm. For the single-scattering phase function, the results of the micro-CT particles were consistent with those of a conceptual two-shape model. However, the particle size dependence differed for the single-scattering albedo and asymmetry factor.
言語 en
書誌情報 en : JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER

巻 209, p. 113-128, 発行日 2018-04-01
出版者
言語 en
出版者 PERGAMON-ELSEVIER SCIENCE LTD
ISSN
収録物識別子タイプ EISSN
収録物識別子 1879-1352
DOI
関連識別子 10.1016/j.jqsrt.2018.01.021
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