Micro-Morphology of the Snow Surface at the Quelccaya Ice Cap, Peru
Abstract During the June-July 1979 expedition a large variety of micro-forms was observed at the surface of the Quelccaya ice cap, their altitudinal distribution being primarily controlled by the heat budget. At 5200–5300 m penitentes are best developed, with azimuth orientation and inclination of f...
Published in: | Journal of Glaciology |
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Language: | English |
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Cambridge University Press (CUP)
1981
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Online Access: | http://dx.doi.org/10.1017/s002214300001145x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S002214300001145X |
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crcambridgeupr:10.1017/s002214300001145x 2024-03-03T08:45:19+00:00 Micro-Morphology of the Snow Surface at the Quelccaya Ice Cap, Peru Hastenrath, Stefan Koci, Bruce 1981 http://dx.doi.org/10.1017/s002214300001145x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S002214300001145X en eng Cambridge University Press (CUP) Journal of Glaciology volume 27, issue 97, page 423-428 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1981 crcambridgeupr https://doi.org/10.1017/s002214300001145x 2024-02-08T08:47:47Z Abstract During the June-July 1979 expedition a large variety of micro-forms was observed at the surface of the Quelccaya ice cap, their altitudinal distribution being primarily controlled by the heat budget. At 5200–5300 m penitentes are best developed, with azimuth orientation and inclination of features conforming to the insolation geometry around local noon. At a westward-facing slope in 5360–5380 m a set of penitentes striking parallel to the contours is superimposed on the pattern dominating at the lower elevations. The ablation forms of penitentes give way to various deposition features above a transition zone around 5400 m in broad agreement with the larger net all-wave radiation and greater importance of melting at lower elevations. The succession of forms with an upward change from surface-parallel plates to elaborate dendritic forms appears to be controlled by the temperature conditions. The conspicuous development of forms encountered during the 1979 expedition appears characteristic of prolonged absence of fresh snow-fall subsequent to a season with abundant precipitation. Article in Journal/Newspaper Ice cap Journal of Glaciology Cambridge University Press Journal of Glaciology 27 97 423 428 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Hastenrath, Stefan Koci, Bruce Micro-Morphology of the Snow Surface at the Quelccaya Ice Cap, Peru |
topic_facet |
Earth-Surface Processes |
description |
Abstract During the June-July 1979 expedition a large variety of micro-forms was observed at the surface of the Quelccaya ice cap, their altitudinal distribution being primarily controlled by the heat budget. At 5200–5300 m penitentes are best developed, with azimuth orientation and inclination of features conforming to the insolation geometry around local noon. At a westward-facing slope in 5360–5380 m a set of penitentes striking parallel to the contours is superimposed on the pattern dominating at the lower elevations. The ablation forms of penitentes give way to various deposition features above a transition zone around 5400 m in broad agreement with the larger net all-wave radiation and greater importance of melting at lower elevations. The succession of forms with an upward change from surface-parallel plates to elaborate dendritic forms appears to be controlled by the temperature conditions. The conspicuous development of forms encountered during the 1979 expedition appears characteristic of prolonged absence of fresh snow-fall subsequent to a season with abundant precipitation. |
format |
Article in Journal/Newspaper |
author |
Hastenrath, Stefan Koci, Bruce |
author_facet |
Hastenrath, Stefan Koci, Bruce |
author_sort |
Hastenrath, Stefan |
title |
Micro-Morphology of the Snow Surface at the Quelccaya Ice Cap, Peru |
title_short |
Micro-Morphology of the Snow Surface at the Quelccaya Ice Cap, Peru |
title_full |
Micro-Morphology of the Snow Surface at the Quelccaya Ice Cap, Peru |
title_fullStr |
Micro-Morphology of the Snow Surface at the Quelccaya Ice Cap, Peru |
title_full_unstemmed |
Micro-Morphology of the Snow Surface at the Quelccaya Ice Cap, Peru |
title_sort |
micro-morphology of the snow surface at the quelccaya ice cap, peru |
publisher |
Cambridge University Press (CUP) |
publishDate |
1981 |
url |
http://dx.doi.org/10.1017/s002214300001145x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S002214300001145X |
genre |
Ice cap Journal of Glaciology |
genre_facet |
Ice cap Journal of Glaciology |
op_source |
Journal of Glaciology volume 27, issue 97, page 423-428 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s002214300001145x |
container_title |
Journal of Glaciology |
container_volume |
27 |
container_issue |
97 |
container_start_page |
423 |
op_container_end_page |
428 |
_version_ |
1792500845424672768 |