Airborne Spectral Measurements of Surface-Atmosphere Anisotropy for Arctic Sea Ice and Tundra
Angular distributions of spectral reflectance for four common arctic surfaces: snow-covered sea ice, melt-season sea ice, snow-covered tundra, and tundra shortly after snowmelt were measured using an aircraft based, high angular resolution (1-degree) multispectral radiometer. Results indicate bidire...
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ftnasantrs:oai:casi.ntrs.nasa.gov:20000021334 2023-05-15T13:10:38+02:00 Airborne Spectral Measurements of Surface-Atmosphere Anisotropy for Arctic Sea Ice and Tundra King, Michael D. Arnold, G. Thomas Soulen, Peter F. Li, Jason Y. Tsay, Si-Chee Unclassified, Unlimited, Publicly available 1999 application/pdf http://hdl.handle.net/2060/20000021334 unknown Document ID: 20000021334 http://hdl.handle.net/2060/20000021334 No Copyright CASI Environment Pollution 1999 ftnasantrs 2019-07-21T07:58:19Z Angular distributions of spectral reflectance for four common arctic surfaces: snow-covered sea ice, melt-season sea ice, snow-covered tundra, and tundra shortly after snowmelt were measured using an aircraft based, high angular resolution (1-degree) multispectral radiometer. Results indicate bidirectional reflectance is higher for snow-covered sea ice than melt-season sea ice at all wavelengths between 0.47 and 2.3 pm, with the difference increasing with wavelength. Bidirectional reflectance of snow-covered tundra is higher than for snow-free tundra for measurements less than 1.64 pm, with the difference decreasing with wavelength. Bidirectional reflectance patterns of all measured surfaces show maximum reflectance in the forward scattering direction of the principal plane, with identifiable specular reflection for the melt-season sea ice and snow-free tundra cases. The snow-free tundra had the most significant backscatter, and the melt-season sea ice the least. For sea ice, bidirectional reflectance changes due to snowmelt were more significant than differences among the different types of melt-season sea ice. Also the spectral-hemispherical (plane) albedo of each measured arctic surface was computed. Comparing measured nadir reflectance to albedo for sea ice and snow-covered tundra shows albedo underestimated 5-40%, with the largest bias at wavelengths beyond 1 pm. For snow-free tundra, nadir reflectance underestimates plane albedo by about 30-50%. Other/Unknown Material albedo Arctic Sea ice Tundra NASA Technical Reports Server (NTRS) Arctic |
institution |
Open Polar |
collection |
NASA Technical Reports Server (NTRS) |
op_collection_id |
ftnasantrs |
language |
unknown |
topic |
Environment Pollution |
spellingShingle |
Environment Pollution King, Michael D. Arnold, G. Thomas Soulen, Peter F. Li, Jason Y. Tsay, Si-Chee Airborne Spectral Measurements of Surface-Atmosphere Anisotropy for Arctic Sea Ice and Tundra |
topic_facet |
Environment Pollution |
description |
Angular distributions of spectral reflectance for four common arctic surfaces: snow-covered sea ice, melt-season sea ice, snow-covered tundra, and tundra shortly after snowmelt were measured using an aircraft based, high angular resolution (1-degree) multispectral radiometer. Results indicate bidirectional reflectance is higher for snow-covered sea ice than melt-season sea ice at all wavelengths between 0.47 and 2.3 pm, with the difference increasing with wavelength. Bidirectional reflectance of snow-covered tundra is higher than for snow-free tundra for measurements less than 1.64 pm, with the difference decreasing with wavelength. Bidirectional reflectance patterns of all measured surfaces show maximum reflectance in the forward scattering direction of the principal plane, with identifiable specular reflection for the melt-season sea ice and snow-free tundra cases. The snow-free tundra had the most significant backscatter, and the melt-season sea ice the least. For sea ice, bidirectional reflectance changes due to snowmelt were more significant than differences among the different types of melt-season sea ice. Also the spectral-hemispherical (plane) albedo of each measured arctic surface was computed. Comparing measured nadir reflectance to albedo for sea ice and snow-covered tundra shows albedo underestimated 5-40%, with the largest bias at wavelengths beyond 1 pm. For snow-free tundra, nadir reflectance underestimates plane albedo by about 30-50%. |
author |
King, Michael D. Arnold, G. Thomas Soulen, Peter F. Li, Jason Y. Tsay, Si-Chee |
author_facet |
King, Michael D. Arnold, G. Thomas Soulen, Peter F. Li, Jason Y. Tsay, Si-Chee |
author_sort |
King, Michael D. |
title |
Airborne Spectral Measurements of Surface-Atmosphere Anisotropy for Arctic Sea Ice and Tundra |
title_short |
Airborne Spectral Measurements of Surface-Atmosphere Anisotropy for Arctic Sea Ice and Tundra |
title_full |
Airborne Spectral Measurements of Surface-Atmosphere Anisotropy for Arctic Sea Ice and Tundra |
title_fullStr |
Airborne Spectral Measurements of Surface-Atmosphere Anisotropy for Arctic Sea Ice and Tundra |
title_full_unstemmed |
Airborne Spectral Measurements of Surface-Atmosphere Anisotropy for Arctic Sea Ice and Tundra |
title_sort |
airborne spectral measurements of surface-atmosphere anisotropy for arctic sea ice and tundra |
publishDate |
1999 |
url |
http://hdl.handle.net/2060/20000021334 |
op_coverage |
Unclassified, Unlimited, Publicly available |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
albedo Arctic Sea ice Tundra |
genre_facet |
albedo Arctic Sea ice Tundra |
op_source |
CASI |
op_relation |
Document ID: 20000021334 http://hdl.handle.net/2060/20000021334 |
op_rights |
No Copyright |
_version_ |
1766236717830897664 |