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  1. 防災科研関係論文

In situ measurements of polarization properties of snow surface under the Brewster geometry in Hokkaido, Japan, and northwest Greenland ice sheet

https://nied-repo.bosai.go.jp/records/4020
https://nied-repo.bosai.go.jp/records/4020
b679243a-9607-4b27-a391-a468ab8f53f4
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル In situ measurements of polarization properties of snow surface under the Brewster geometry in Hokkaido, Japan, and northwest Greenland ice sheet
言語
言語 eng
著者 Tomonori Tanikawa

× Tomonori Tanikawa

en Tomonori Tanikawa

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Masahiro Hori

× Masahiro Hori

en Masahiro Hori

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Teruo Aoki

× Teruo Aoki

en Teruo Aoki

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Akihiro Hachikubo

× Akihiro Hachikubo

en Akihiro Hachikubo

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Katsuyuki Kuchiki

× Katsuyuki Kuchiki

en Katsuyuki Kuchiki

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Masashi Niwano

× Masashi Niwano

en Masashi Niwano

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Sumito Matoba

× Sumito Matoba

en Sumito Matoba

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Satoru Yamaguchi

× Satoru Yamaguchi

en Satoru Yamaguchi

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Knut Stamnes

× Knut Stamnes

en Knut Stamnes

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抄録
内容記述タイプ Other
内容記述 Ground-based measurements of spectral degree of linear polarization (DLP) of various snow types were made during intensive field campaigns in a snowfield in Hokkaido, Japan, and on the northwest Greenland ice sheet in 2012. Spectral measurements were conducted under the solar zenith angle of approximately the Brewster angle in order to quantify the polarization properties of light reflected from snow. We obtained spectral DLPs for five different snow types in both field campaigns including precipitation particles, needles, surface hoar, melt forms, and melt freeze crust covering the snow surface. The measurements showed that in the visible region the spectral dependence of the DLP was small while in the near infrared region it increased with increasing snow grain size with some distinct local peaks. The angular dependence indicated that the DLP exhibited small angular dependence in the visible region while in the near-infrared region it exhibited large and broad peaks in the forward direction. Especially for the melt-freeze crust, the DLP approached 1.0 at wavelengths close to λ = 1.5 and 2.0 μm. These features can be explained by (1) the relative contribution of surface versus volume scattering to the reflected light, (2) the incident angle (solar zenith angle) of approximately the Brewster angle, and (3) the ratio between direct and diffuse components of the solar radiation incident on the snow surface. The spectral DLP was found to be quiet sensitive to the incident solar radiation and solar elevation as well as snow optical properties. Comparison between the spectral DLP and snow grain size obtained by snow pit work shows that the DLP for λ &gt
1.5 μm was very sensitive to large snow grains close to the surface. This finding suggests that polarization measurements obtained from airborne/satellite polarimeters will be useful for surface snow grain size retrievals and help improve the accuracy of such retrievals based on the intensity-only measurements, especially for the large snow grain sizes.
言語 en
書誌情報 en : JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES

巻 119, 号 24, p. 13946-13964
出版者
言語 en
出版者 AMER GEOPHYSICAL UNION
ISSN
収録物識別子タイプ EISSN
収録物識別子 2169-8996
DOI
関連識別子 10.1002/2014JD022325
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