Survey of the seasonal snow cover of Alaska
The author has identified the following significant results. The delineation of the transient snow cover can generally be made directly from any of the RBV of MSS images. On many glaciers, however, there seems to be a relatively small difference between the reflectivities of snow and ice in the visi...
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ftnasantrs:oai:casi.ntrs.nasa.gov:19730005605 2023-05-15T15:07:06+02:00 Survey of the seasonal snow cover of Alaska Weller, G. E. Unclassified, Unlimited, Publicly available Dec 13, 1972 application/pdf http://hdl.handle.net/2060/19730005605 unknown Document ID: 19730005605 Accession ID: 73N14332 http://hdl.handle.net/2060/19730005605 No Copyright CASI GEOPHYSICS E72-10344 NASA-CR-129658 BMPR-2 1972 ftnasantrs 2019-07-21T11:32:52Z The author has identified the following significant results. The delineation of the transient snow cover can generally be made directly from any of the RBV of MSS images. On many glaciers, however, there seems to be a relatively small difference between the reflectivities of snow and ice in the visible portion of the spectrum (corresponding to MSS bands 4 and 5). On the other hand, the reflectivity is distinctly lower for ice than for snow in the near infrared (MSS bands 6 and 7). By applying the sensors of the latter spectral bands the position of the transient snowline, indicative of the mass balance, can in many cases be determined with what appears to be a satisfactory accuracy. This circumstance should prove especially useful in studies of regional variations of glacier mass balances. It had been found that the effect of winds early in the fall seasons can be seen on the arctic slope when a light dusting of snow is present. Winds channeled by topography redistribute the snow and actually remove it from regions. After freeze up has occurred and a continuous snow cover exists it is possible to identify open water reaches on streams flowing through the region. Such cases are identifiable on the ERTS images especially on the MSS 7 images. Other/Unknown Material Arctic glacier glaciers Alaska NASA Technical Reports Server (NTRS) Arctic |
institution |
Open Polar |
collection |
NASA Technical Reports Server (NTRS) |
op_collection_id |
ftnasantrs |
language |
unknown |
topic |
GEOPHYSICS |
spellingShingle |
GEOPHYSICS Weller, G. E. Survey of the seasonal snow cover of Alaska |
topic_facet |
GEOPHYSICS |
description |
The author has identified the following significant results. The delineation of the transient snow cover can generally be made directly from any of the RBV of MSS images. On many glaciers, however, there seems to be a relatively small difference between the reflectivities of snow and ice in the visible portion of the spectrum (corresponding to MSS bands 4 and 5). On the other hand, the reflectivity is distinctly lower for ice than for snow in the near infrared (MSS bands 6 and 7). By applying the sensors of the latter spectral bands the position of the transient snowline, indicative of the mass balance, can in many cases be determined with what appears to be a satisfactory accuracy. This circumstance should prove especially useful in studies of regional variations of glacier mass balances. It had been found that the effect of winds early in the fall seasons can be seen on the arctic slope when a light dusting of snow is present. Winds channeled by topography redistribute the snow and actually remove it from regions. After freeze up has occurred and a continuous snow cover exists it is possible to identify open water reaches on streams flowing through the region. Such cases are identifiable on the ERTS images especially on the MSS 7 images. |
format |
Other/Unknown Material |
author |
Weller, G. E. |
author_facet |
Weller, G. E. |
author_sort |
Weller, G. E. |
title |
Survey of the seasonal snow cover of Alaska |
title_short |
Survey of the seasonal snow cover of Alaska |
title_full |
Survey of the seasonal snow cover of Alaska |
title_fullStr |
Survey of the seasonal snow cover of Alaska |
title_full_unstemmed |
Survey of the seasonal snow cover of Alaska |
title_sort |
survey of the seasonal snow cover of alaska |
publishDate |
1972 |
url |
http://hdl.handle.net/2060/19730005605 |
op_coverage |
Unclassified, Unlimited, Publicly available |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic glacier glaciers Alaska |
genre_facet |
Arctic glacier glaciers Alaska |
op_source |
CASI |
op_relation |
Document ID: 19730005605 Accession ID: 73N14332 http://hdl.handle.net/2060/19730005605 |
op_rights |
No Copyright |
_version_ |
1766338662441680896 |