In situ measurements of polarization properties of snow surface under the Brewster geometry in Hokkaido, Japan, and northwest Greenland ice sheet
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 approxi...
Published in: | Journal of Geophysical Research: Atmospheres |
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ftkitamiit:oai:kitami-it.repo.nii.ac.jp:00008894 2023-05-15T16:28:41+02:00 In situ measurements of polarization properties of snow surface under the Brewster geometry in Hokkaido, Japan, and northwest Greenland ice sheet Tanikawa, Tomonori Hori, Masahiro Aoki, Teruo Hachikubo, Akihiro Kuchiki, Katsuyuki Niwano, Masashi Matoba, Sumito Yamaguchi, Satoru Stamnes, Knut 2014 application/pdf https://kitami-it.repo.nii.ac.jp/record/8894/files/J. Geophys.Res. Atmos.,119, 13,946?13,964.pdf eng eng AGU Publications https://doi.org/10.1002/2014JD022325 Journal of Geophysical Research: Atmospheres 24 119 13,946 13,964 2169-897X https://kitami-it.repo.nii.ac.jp/record/8894/files/J. Geophys.Res. Atmos.,119, 13,946?13,964.pdf 2014 ftkitamiit https://doi.org/10.1002/2014JD022325 2023-02-26T09:17:10Z 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 > 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. journal ... Other/Unknown Material Greenland Ice Sheet Kitami Institute of Technology Repository (KIT-R) Brewster ENVELOPE(169.383,169.383,-72.950,-72.950) Greenland Journal of Geophysical Research: Atmospheres 119 24 13,946 13,964 |
institution |
Open Polar |
collection |
Kitami Institute of Technology Repository (KIT-R) |
op_collection_id |
ftkitamiit |
language |
English |
description |
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 > 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. journal ... |
author |
Tanikawa, Tomonori Hori, Masahiro Aoki, Teruo Hachikubo, Akihiro Kuchiki, Katsuyuki Niwano, Masashi Matoba, Sumito Yamaguchi, Satoru Stamnes, Knut |
spellingShingle |
Tanikawa, Tomonori Hori, Masahiro Aoki, Teruo Hachikubo, Akihiro Kuchiki, Katsuyuki Niwano, Masashi Matoba, Sumito Yamaguchi, Satoru Stamnes, Knut In situ measurements of polarization properties of snow surface under the Brewster geometry in Hokkaido, Japan, and northwest Greenland ice sheet |
author_facet |
Tanikawa, Tomonori Hori, Masahiro Aoki, Teruo Hachikubo, Akihiro Kuchiki, Katsuyuki Niwano, Masashi Matoba, Sumito Yamaguchi, Satoru Stamnes, Knut |
author_sort |
Tanikawa, Tomonori |
title |
In situ measurements of polarization properties of snow surface under the Brewster geometry in Hokkaido, Japan, and northwest Greenland ice sheet |
title_short |
In situ measurements of polarization properties of snow surface under the Brewster geometry in Hokkaido, Japan, and northwest Greenland ice sheet |
title_full |
In situ measurements of polarization properties of snow surface under the Brewster geometry in Hokkaido, Japan, and northwest Greenland ice sheet |
title_fullStr |
In situ measurements of polarization properties of snow surface under the Brewster geometry in Hokkaido, Japan, and northwest Greenland ice sheet |
title_full_unstemmed |
In situ measurements of polarization properties of snow surface under the Brewster geometry in Hokkaido, Japan, and northwest Greenland ice sheet |
title_sort |
in situ measurements of polarization properties of snow surface under the brewster geometry in hokkaido, japan, and northwest greenland ice sheet |
publisher |
AGU Publications |
publishDate |
2014 |
url |
https://kitami-it.repo.nii.ac.jp/record/8894/files/J. Geophys.Res. Atmos.,119, 13,946?13,964.pdf |
long_lat |
ENVELOPE(169.383,169.383,-72.950,-72.950) |
geographic |
Brewster Greenland |
geographic_facet |
Brewster Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_relation |
https://doi.org/10.1002/2014JD022325 Journal of Geophysical Research: Atmospheres 24 119 13,946 13,964 2169-897X https://kitami-it.repo.nii.ac.jp/record/8894/files/J. Geophys.Res. Atmos.,119, 13,946?13,964.pdf |
op_doi |
https://doi.org/10.1002/2014JD022325 |
container_title |
Journal of Geophysical Research: Atmospheres |
container_volume |
119 |
container_issue |
24 |
container_start_page |
13,946 |
op_container_end_page |
13,964 |
_version_ |
1766018360301060096 |