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Dependence of thermal infrared emissive behaviors of snow cover on the surface snow type

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Title: Dependence of thermal infrared emissive behaviors of snow cover on the surface snow type
Other Titles: 雪面の熱赤外射出特性の雪質依存性
Authors: HORI, Masahiro1 Browse this author
AOKI, Teruo2 Browse this author →KAKEN DB
TANIKAWA, Tomonori3 Browse this author
KUCHIKI, Katsuyuki4 Browse this author →KAKEN DB
NIWANO, Masashi5 Browse this author →KAKEN DB
YAMAGUCHI, Satoru6 Browse this author →KAKEN DB
MATOBA, Sumito7 Browse this author →KAKEN DB
Authors(alt): 堀, 雅裕1
青木, 輝夫2
谷川, 朋範3
朽木, 勝幸4
庭野, 匡思5
山口, 悟6
的場, 澄人7
Keywords: spectral emissivity
snow and ice
thermal infrared
surface temperature
snow grain size
Issue Date: Aug-2014
Publisher: The Japanese Society of Snow and Ice
Journal Title: Bulletin of Glaciological Research
Volume: 32
Start Page: 33
End Page: 45
Publisher DOI: 10.5331/bgr.32.33
Abstract: The potential of the thermal infrared (TIR) remote sensing for discriminating surface snow types was examined by analyzing TIR radiances acquired from space over the Greenland ice sheet. The brightness temperature difference (BTD) between TIR wavelengths of 11 and 12μm was found to increase in accordance with in situ observed evolutions of surface snow type. Spatial and temporal distributions of BTD over the entire ice sheet indicated that BTD has a sensitivity of about 1.2 K for variations of the possible snow types. The observed behaviors of BTD were coincident with those predicted by a radiative transfer calculation using previous in situ measured snow emissivities, although some biases on the order of 0.1-0.3 K remain. The dependence of BTD on the surface snow type was also consistent with the behaviors of snow reflectance at the shortwave infrared (SWIR) wavelength 1.6μm, which is a measure of snow grain size, except for the case of melting wet snow. The inconsistency in the wet snow case was considered to be due to the different optical responses of the TIR and SWIR signals to wet snow, which suggested the possibility of using TIR signals to discriminate wet/dry conditions of snow cover in an old stage. As a result, it is determined that TIR remote sensing has potential not only as an approach supplementary to the SWIR method for assessing surface snow types in daytime but also as the only method for simultaneous retrieval of snow type and surface temperature in nighttime.
Type: article
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 的場 澄人

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