Spectral bidirectional reflectance of Antarctic snow: Measurements and parameterization
International audience The bidirectional reflectance distribution function (BRDF) of snow was measured from a 32-m tower at Dome C, at latitude 75°S on the East Antarctic Plateau. These measurements were made at 96 solar zenith angles between 51° and 87° and cover wavelengths 350–2400 nm, with 3- to...
Published in: | Journal of Geophysical Research |
---|---|
Main Authors: | , , , , |
Other Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2006
|
Subjects: | |
Online Access: | https://hal-insu.archives-ouvertes.fr/insu-00375506 https://hal-insu.archives-ouvertes.fr/insu-00375506/document https://hal-insu.archives-ouvertes.fr/insu-00375506/file/2006JD007290.pdf https://doi.org/10.1029/2006JD007290 |
id |
ftunivnantes:oai:HAL:insu-00375506v1 |
---|---|
record_format |
openpolar |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
BRDF snow Antarctica [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU]Sciences of the Universe [physics] |
spellingShingle |
BRDF snow Antarctica [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU]Sciences of the Universe [physics] R. Hudson, Stephen G. Warren, Stephen E. Brandt, Richard C. Grenfell, Thomas Six, Delphine Spectral bidirectional reflectance of Antarctic snow: Measurements and parameterization |
topic_facet |
BRDF snow Antarctica [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU]Sciences of the Universe [physics] |
description |
International audience The bidirectional reflectance distribution function (BRDF) of snow was measured from a 32-m tower at Dome C, at latitude 75°S on the East Antarctic Plateau. These measurements were made at 96 solar zenith angles between 51° and 87° and cover wavelengths 350–2400 nm, with 3- to 30-nm resolution, over the full range of viewing geometry. The BRDF at 900 nm had previously been measured at the South Pole; the Dome C measurement at that wavelength is similar. At both locations the natural roughness of the snow surface causes the anisotropy of the BRDF to be less than that of flat snow. The inherent BRDF of the snow is nearly constant in the high-albedo part of the spectrum (350–900 nm), but the angular distribution of reflected radiance becomes more isotropic at the shorter wavelengths because of atmospheric Rayleigh scattering. Parameterizations were developed for the anisotropic reflectance factor using a small number of empirical orthogonal functions. Because the reflectance is more anisotropic at wavelengths at which ice is more absorptive, albedo rather than wavelength is used as a predictor in the near infrared. The parameterizations cover nearly all viewing angles and are applicable to the high parts of the Antarctic Plateau that have small surface roughness and, at viewing zenith angles less than 55°, elsewhere on the plateau, where larger surface roughness affects the BRDF at larger viewing angles. The root-mean-squared error of the parameterized reflectances is between 2% and 4% at wavelengths less than 1400 nm and between 5% and 8% at longer wavelengths. |
author2 |
Department of Atmospheric Sciences Seattle University of Washington Seattle Laboratoire de glaciologie et géophysique de l'environnement (LGGE) Observatoire des Sciences de l'Univers de Grenoble (OSUG) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
R. Hudson, Stephen G. Warren, Stephen E. Brandt, Richard C. Grenfell, Thomas Six, Delphine |
author_facet |
R. Hudson, Stephen G. Warren, Stephen E. Brandt, Richard C. Grenfell, Thomas Six, Delphine |
author_sort |
R. Hudson, Stephen |
title |
Spectral bidirectional reflectance of Antarctic snow: Measurements and parameterization |
title_short |
Spectral bidirectional reflectance of Antarctic snow: Measurements and parameterization |
title_full |
Spectral bidirectional reflectance of Antarctic snow: Measurements and parameterization |
title_fullStr |
Spectral bidirectional reflectance of Antarctic snow: Measurements and parameterization |
title_full_unstemmed |
Spectral bidirectional reflectance of Antarctic snow: Measurements and parameterization |
title_sort |
spectral bidirectional reflectance of antarctic snow: measurements and parameterization |
publisher |
HAL CCSD |
publishDate |
2006 |
url |
https://hal-insu.archives-ouvertes.fr/insu-00375506 https://hal-insu.archives-ouvertes.fr/insu-00375506/document https://hal-insu.archives-ouvertes.fr/insu-00375506/file/2006JD007290.pdf https://doi.org/10.1029/2006JD007290 |
geographic |
Antarctic The Antarctic South Pole |
geographic_facet |
Antarctic The Antarctic South Pole |
genre |
Antarc* Antarctic Antarctica South pole South pole |
genre_facet |
Antarc* Antarctic Antarctica South pole South pole |
op_source |
ISSN: 2169-897X EISSN: 2169-8996 Journal of Geophysical Research: Atmospheres https://hal-insu.archives-ouvertes.fr/insu-00375506 Journal of Geophysical Research: Atmospheres, 2006, 111 (D18106), 1 à 19 p. ⟨10.1029/2006JD007290⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2006JD007290 insu-00375506 https://hal-insu.archives-ouvertes.fr/insu-00375506 https://hal-insu.archives-ouvertes.fr/insu-00375506/document https://hal-insu.archives-ouvertes.fr/insu-00375506/file/2006JD007290.pdf doi:10.1029/2006JD007290 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2006JD007290 |
container_title |
Journal of Geophysical Research |
container_volume |
111 |
container_issue |
D18 |
_version_ |
1766068528200286208 |
spelling |
ftunivnantes:oai:HAL:insu-00375506v1 2023-05-15T13:35:39+02:00 Spectral bidirectional reflectance of Antarctic snow: Measurements and parameterization R. Hudson, Stephen G. Warren, Stephen E. Brandt, Richard C. Grenfell, Thomas Six, Delphine Department of Atmospheric Sciences Seattle University of Washington Seattle Laboratoire de glaciologie et géophysique de l'environnement (LGGE) Observatoire des Sciences de l'Univers de Grenoble (OSUG) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) 2006 https://hal-insu.archives-ouvertes.fr/insu-00375506 https://hal-insu.archives-ouvertes.fr/insu-00375506/document https://hal-insu.archives-ouvertes.fr/insu-00375506/file/2006JD007290.pdf https://doi.org/10.1029/2006JD007290 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2006JD007290 insu-00375506 https://hal-insu.archives-ouvertes.fr/insu-00375506 https://hal-insu.archives-ouvertes.fr/insu-00375506/document https://hal-insu.archives-ouvertes.fr/insu-00375506/file/2006JD007290.pdf doi:10.1029/2006JD007290 info:eu-repo/semantics/OpenAccess ISSN: 2169-897X EISSN: 2169-8996 Journal of Geophysical Research: Atmospheres https://hal-insu.archives-ouvertes.fr/insu-00375506 Journal of Geophysical Research: Atmospheres, 2006, 111 (D18106), 1 à 19 p. ⟨10.1029/2006JD007290⟩ BRDF snow Antarctica [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2006 ftunivnantes https://doi.org/10.1029/2006JD007290 2023-03-01T02:37:46Z International audience The bidirectional reflectance distribution function (BRDF) of snow was measured from a 32-m tower at Dome C, at latitude 75°S on the East Antarctic Plateau. These measurements were made at 96 solar zenith angles between 51° and 87° and cover wavelengths 350–2400 nm, with 3- to 30-nm resolution, over the full range of viewing geometry. The BRDF at 900 nm had previously been measured at the South Pole; the Dome C measurement at that wavelength is similar. At both locations the natural roughness of the snow surface causes the anisotropy of the BRDF to be less than that of flat snow. The inherent BRDF of the snow is nearly constant in the high-albedo part of the spectrum (350–900 nm), but the angular distribution of reflected radiance becomes more isotropic at the shorter wavelengths because of atmospheric Rayleigh scattering. Parameterizations were developed for the anisotropic reflectance factor using a small number of empirical orthogonal functions. Because the reflectance is more anisotropic at wavelengths at which ice is more absorptive, albedo rather than wavelength is used as a predictor in the near infrared. The parameterizations cover nearly all viewing angles and are applicable to the high parts of the Antarctic Plateau that have small surface roughness and, at viewing zenith angles less than 55°, elsewhere on the plateau, where larger surface roughness affects the BRDF at larger viewing angles. The root-mean-squared error of the parameterized reflectances is between 2% and 4% at wavelengths less than 1400 nm and between 5% and 8% at longer wavelengths. Article in Journal/Newspaper Antarc* Antarctic Antarctica South pole South pole Université de Nantes: HAL-UNIV-NANTES Antarctic The Antarctic South Pole Journal of Geophysical Research 111 D18 |