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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 52, Iss. 30 — Oct. 20, 2013
  • pp: 7243–7255

Modeling angular-dependent spectral emissivity of snow and ice in the thermal infrared atmospheric window

Masahiro Hori, Teruo Aoki, Tomonori Tanikawa, Akihiro Hachikubo, Konosuke Sugiura, Katsuyuki Kuchiki, and Masashi Niwano  »View Author Affiliations


Applied Optics, Vol. 52, Issue 30, pp. 7243-7255 (2013)
http://dx.doi.org/10.1364/AO.52.007243


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Abstract

A model of angular-dependent emissivity spectra of snow and ice in the 8–14 μm atmospheric window is constructed. Past field research revealed that snow emissivity varies depending on snow grain size and the exitance angle. Thermography images acquired in this study further revealed that not only welded snow particles such as sun crust, but also disaggregated particles such as granular snow and dendrite crystals exhibit high reflectivity on their crystal facets, even when the bulk snow surface exhibits blackbody-like behavior as a whole. The observed thermal emissive behaviors of snow particles suggest that emissivity of the bulk snow surface can be expressed by a weighted sum of two emissivity components: those of the specular and blackbody surfaces. Based on this assumption, a semi-empirical emissivity model was constructed; it is expressed by a linear combination of specular and blackbody surfaces’ emissivities with a weighting parameter characterizing the specularity of the bulk surface. Emissivity spectra calculated using the model succeeded in reproducing the past in situ measured directional spectra of various snow types by employing a specific weighting parameter for each snow type.

© 2013 Optical Society of America

OCIS Codes
(280.0280) Remote sensing and sensors : Remote sensing and sensors
(290.0290) Scattering : Scattering
(290.6815) Scattering : Thermal emission
(280.6780) Remote sensing and sensors : Temperature

ToC Category:
Scattering

History
Original Manuscript: May 20, 2013
Revised Manuscript: August 7, 2013
Manuscript Accepted: September 16, 2013
Published: October 15, 2013

Citation
Masahiro Hori, Teruo Aoki, Tomonori Tanikawa, Akihiro Hachikubo, Konosuke Sugiura, Katsuyuki Kuchiki, and Masashi Niwano, "Modeling angular-dependent spectral emissivity of snow and ice in the thermal infrared atmospheric window," Appl. Opt. 52, 7243-7255 (2013)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-52-30-7243


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