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ABSTRACT. Advanced Very High Resolution Radiometer (AVHRR) data are used to extract broadband sea ice surface albedos from narrowband channel 1 and 2 top of the atmosphere (TOA) radiances. Corrections for the intervening atmosphere, viewing geometry and sensor spectral response are applied to the sa...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.490.3170 2023-05-15T13:10:54+02:00 ARCTIC The Pennsylvania State University CiteSeerX Archives 1993 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.490.3170 http://pubs.aina.ucalgary.ca/arctic/arctic47-3-288.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.490.3170 http://pubs.aina.ucalgary.ca/arctic/arctic47-3-288.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://pubs.aina.ucalgary.ca/arctic/arctic47-3-288.pdf text 1993 ftciteseerx 2016-01-08T08:28:26Z ABSTRACT. Advanced Very High Resolution Radiometer (AVHRR) data are used to extract broadband sea ice surface albedos from narrowband channel 1 and 2 top of the atmosphere (TOA) radiances. Corrections for the intervening atmosphere, viewing geometry and sensor spectral response are applied to the satellite data. Atmospheric correction increases TOA albedos by 27 to 32%. After removing the effects of viewing geometry, surface albedo variability between orbits decreases. The satellite-derived surface albedo over snow-covered sea ice corrected for viewing geometry ranged from 0.68 to 0.82. The residual diurnal variability is attributed to uncertainties in the atmospheric and anisotropic corrections of the satellite data. After comparison with coincidental in situ measurements, AVHRR albedos corrected for the intervening atmosphere and viewing geometry agreed favorably with surface measurements. The high variability in surface measurements reflects the difficulty in measuring surface albedos over areas consistent with those of a typical AVHRR pixel. In order to develop a reliable methodology for using these satellite data to derive sea ice albedo, an improved understanding of both the atmosphere’s behavior over the long path lengths common to the Arctic and the anisotropic nature of snow-covered sea ice reflectance is required. Furthermore, any seasonal characteristics of these factors must be addressed. Key words: sea ice, albedo, remote sensing, AVHRR, anisotropy RÉSUMÉ. On utilise des données obtenues par radiomètre perfectionné à très haute résolution pour extraire des albédos à large bande de la surface de la glace à partir de luminances du sommet de l’atmosphère du canal 1 et 2 à bande étroite. On applique aux données par satellite des corrections pour l’atmosphère intermédiaire, l’angle de prise de vue et la réponse spectrale des capteurs. La correction Text albedo Arctic Arctic Sea ice Unknown Arctic |
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ABSTRACT. Advanced Very High Resolution Radiometer (AVHRR) data are used to extract broadband sea ice surface albedos from narrowband channel 1 and 2 top of the atmosphere (TOA) radiances. Corrections for the intervening atmosphere, viewing geometry and sensor spectral response are applied to the satellite data. Atmospheric correction increases TOA albedos by 27 to 32%. After removing the effects of viewing geometry, surface albedo variability between orbits decreases. The satellite-derived surface albedo over snow-covered sea ice corrected for viewing geometry ranged from 0.68 to 0.82. The residual diurnal variability is attributed to uncertainties in the atmospheric and anisotropic corrections of the satellite data. After comparison with coincidental in situ measurements, AVHRR albedos corrected for the intervening atmosphere and viewing geometry agreed favorably with surface measurements. The high variability in surface measurements reflects the difficulty in measuring surface albedos over areas consistent with those of a typical AVHRR pixel. In order to develop a reliable methodology for using these satellite data to derive sea ice albedo, an improved understanding of both the atmosphere’s behavior over the long path lengths common to the Arctic and the anisotropic nature of snow-covered sea ice reflectance is required. Furthermore, any seasonal characteristics of these factors must be addressed. Key words: sea ice, albedo, remote sensing, AVHRR, anisotropy RÉSUMÉ. On utilise des données obtenues par radiomètre perfectionné à très haute résolution pour extraire des albédos à large bande de la surface de la glace à partir de luminances du sommet de l’atmosphère du canal 1 et 2 à bande étroite. On applique aux données par satellite des corrections pour l’atmosphère intermédiaire, l’angle de prise de vue et la réponse spectrale des capteurs. La correction |
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The Pennsylvania State University CiteSeerX Archives |
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arctic |
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1993 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.490.3170 http://pubs.aina.ucalgary.ca/arctic/arctic47-3-288.pdf |
geographic |
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albedo Arctic Arctic Sea ice |
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albedo Arctic Arctic Sea ice |
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http://pubs.aina.ucalgary.ca/arctic/arctic47-3-288.pdf |
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http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.490.3170 http://pubs.aina.ucalgary.ca/arctic/arctic47-3-288.pdf |
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Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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