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

HORI, Masahiro; AOKI, Teruo; TANIKAWA, Tomonori; KUCHIKI, Katsuyuki; NIWANO, Masashi; YAMAGUCHI, Satoru; MATOBA, Sumito

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

HORI, Masahiro; AOKI, Teruo; TANIKAWA, Tomonori et al.

Bulletin of Glaciological Research, 2014, 32, 33-45

Permalink : https://hdl.handle.net/2115/56972

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アクセス権	open access
URI	https://hdl.handle.net/2115/56972
タイトル	Dependence of thermal infrared emissive behaviors of snow cover on the surface snow type
タイトル	雪面の熱赤外射出特性の雪質依存性
著者	HORI, Masahiro ; AOKI, Teruo ; TANIKAWA, Tomonori ; KUCHIKI, Katsuyuki ; NIWANO, Masashi ; YAMAGUCHI, Satoru ; MATOBA, Sumito
著者名 HORI, Masahiro 堀, 雅裕
e-Rad_Researcher 30354492 著者名 AOKI, Teruo 青木, 輝夫
著者名 TANIKAWA, Tomonori 谷川, 朋範
e-Rad_Researcher 80442739 著者名 KUCHIKI, Katsuyuki 朽木, 勝幸
e-Rad_Researcher 10515026 著者名 NIWANO, Masashi 庭野, 匡思
e-Rad_Researcher 70425510 著者名 YAMAGUCHI, Satoru 山口, 悟
e-Rad_Researcher 30391163 著者名 MATOBA, Sumito 的場, 澄人
言語	英語
キーワード	spectral emissivity
	snow and ice
	thermal infrared
	surface temperature
	snow grain size
	分光射出率
	雪氷
	熱赤外
	表面温度
	積雪粒径
発行日	2014-08
出版者	The Japanese Society of Snow and Ice
出版者	日本雪氷学会
収録物名	Bulletin of Glaciological Research
巻(号)	32
ページ	33-45
抄録	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.
資源タイプ	学術雑誌論文
出版タイプ	Version of Record
PISSN	1345-3807
EISSN	1884-8044
関連情報 (isIdenticalTo)	出版社版DOI https://doi.org/10.5331/bgr.32.33