Spectral albedos of midlatitude snowpacks
Spectral albedos of impure-nonhomogeneous snowpacks, typical of midlatitudes, from 400 to 2200 nm were modeled through a numerical solution of the radiative transfer equation in the two-stream approximation. Discrete depth-dependent values of density, grain size and impurity concentration were used...
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ftnasantrs:oai:casi.ntrs.nasa.gov:19820010789 2023-05-15T15:39:43+02:00 Spectral albedos of midlatitude snowpacks Choudhury, B. Unclassified, Unlimited, Publicly available Nov 1, 1981 application/pdf http://hdl.handle.net/2060/19820010789 unknown Document ID: 19820010789 Accession ID: 82N18663 http://hdl.handle.net/2060/19820010789 No Copyright CASI EARTH RESOURCES AND REMOTE SENSING NASA-TM-83858 1981 ftnasantrs 2019-07-21T10:17:30Z Spectral albedos of impure-nonhomogeneous snowpacks, typical of midlatitudes, from 400 to 2200 nm were modeled through a numerical solution of the radiative transfer equation in the two-stream approximation. Discrete depth-dependent values of density, grain size and impurity concentration were used to characterize the snowpacks. The model is for diffuse incident radiation, and the numerical method is based on doubling and invariant imbedding. The effect of soot impurities on snowpack albedos is illustrated when a snowpack is several centimeters deep and soot reduces the albedos at visible wavelengths, however, when a snowpack is only a few centimeters deep, soot may increase the albedos at visible wavelengths. By adjusting soot content and snow grain size, good quantitative agreement with some observations at the Cascade Mountains (Washington) and at Point Barrow (Alaska) are obtained; however, the model grain sizes are found to be fifty to four hundred percent larger than the measured values. For satellite snowcover observations, a model for effective albedo of partially snow-covered areas was developed and compared with some NOAA-2 observations of the southeastern United States. Other/Unknown Material Barrow Point Barrow Alaska NASA Technical Reports Server (NTRS) |
institution |
Open Polar |
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NASA Technical Reports Server (NTRS) |
op_collection_id |
ftnasantrs |
language |
unknown |
topic |
EARTH RESOURCES AND REMOTE SENSING |
spellingShingle |
EARTH RESOURCES AND REMOTE SENSING Choudhury, B. Spectral albedos of midlatitude snowpacks |
topic_facet |
EARTH RESOURCES AND REMOTE SENSING |
description |
Spectral albedos of impure-nonhomogeneous snowpacks, typical of midlatitudes, from 400 to 2200 nm were modeled through a numerical solution of the radiative transfer equation in the two-stream approximation. Discrete depth-dependent values of density, grain size and impurity concentration were used to characterize the snowpacks. The model is for diffuse incident radiation, and the numerical method is based on doubling and invariant imbedding. The effect of soot impurities on snowpack albedos is illustrated when a snowpack is several centimeters deep and soot reduces the albedos at visible wavelengths, however, when a snowpack is only a few centimeters deep, soot may increase the albedos at visible wavelengths. By adjusting soot content and snow grain size, good quantitative agreement with some observations at the Cascade Mountains (Washington) and at Point Barrow (Alaska) are obtained; however, the model grain sizes are found to be fifty to four hundred percent larger than the measured values. For satellite snowcover observations, a model for effective albedo of partially snow-covered areas was developed and compared with some NOAA-2 observations of the southeastern United States. |
format |
Other/Unknown Material |
author |
Choudhury, B. |
author_facet |
Choudhury, B. |
author_sort |
Choudhury, B. |
title |
Spectral albedos of midlatitude snowpacks |
title_short |
Spectral albedos of midlatitude snowpacks |
title_full |
Spectral albedos of midlatitude snowpacks |
title_fullStr |
Spectral albedos of midlatitude snowpacks |
title_full_unstemmed |
Spectral albedos of midlatitude snowpacks |
title_sort |
spectral albedos of midlatitude snowpacks |
publishDate |
1981 |
url |
http://hdl.handle.net/2060/19820010789 |
op_coverage |
Unclassified, Unlimited, Publicly available |
genre |
Barrow Point Barrow Alaska |
genre_facet |
Barrow Point Barrow Alaska |
op_source |
CASI |
op_relation |
Document ID: 19820010789 Accession ID: 82N18663 http://hdl.handle.net/2060/19820010789 |
op_rights |
No Copyright |
_version_ |
1766371764040892416 |