Regime of an Afghan Glacier
The climatic snow line is a little above the highest peaks in this region (Mir Samir, 5 809 m, lat. 35° 35′ N., long. 70° 10′ E.) but steep north-facing slopes provide a topographie reason for small glaciers persisting, with a snow line a little below 4 900 in (16 000 ft). Snow accumulation at this...
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Language: | English |
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Cambridge University Press (CUP)
1969
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Online Access: | http://dx.doi.org/10.1017/s0022143000020761 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000020761 |
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crcambridgeupr:10.1017/s0022143000020761 2024-03-03T08:46:06+00:00 Regime of an Afghan Glacier Gilbert, O. Jamieson, D. Lister, H. Pendlington, A. 1969 http://dx.doi.org/10.1017/s0022143000020761 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000020761 en eng Cambridge University Press (CUP) Journal of Glaciology volume 8, issue 52, page 51-65 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1969 crcambridgeupr https://doi.org/10.1017/s0022143000020761 2024-02-08T08:41:37Z The climatic snow line is a little above the highest peaks in this region (Mir Samir, 5 809 m, lat. 35° 35′ N., long. 70° 10′ E.) but steep north-facing slopes provide a topographie reason for small glaciers persisting, with a snow line a little below 4 900 in (16 000 ft). Snow accumulation at this height averages 1 300 kg m −2 , most of this falling in late winter and spring. Gross ablation reaches 40 kg m −2 d −1 . Net ablation (July–August), measured as stream discharge, averages 3 600 m 3 d −1 = 9 kg m −2 d −1 . Slow recession is the average condition. Halt stages at 4 800, 4 600 and 4 000 m are interpreted from the topography. Dating of moraines by lichen distribution indicates for the highest of these a minimum age of 400 years. The vertical flux of heat and of water vapour were calculated through an air layer 30–100 cm over a melting firn surface for 24 h. The source of heat available at the surface expressed as a percentage of the total was: net radiation 87, condensation 5, forced convection 1, conduction through snow 6 and unexplained 1. The heat sink was: long-wave radiation 4, evaporation 6, forced convection 6, conduction into snow 2 and melting 82%. Article in Journal/Newspaper Journal of Glaciology Cambridge University Press Journal of Glaciology 8 52 51 65 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Gilbert, O. Jamieson, D. Lister, H. Pendlington, A. Regime of an Afghan Glacier |
topic_facet |
Earth-Surface Processes |
description |
The climatic snow line is a little above the highest peaks in this region (Mir Samir, 5 809 m, lat. 35° 35′ N., long. 70° 10′ E.) but steep north-facing slopes provide a topographie reason for small glaciers persisting, with a snow line a little below 4 900 in (16 000 ft). Snow accumulation at this height averages 1 300 kg m −2 , most of this falling in late winter and spring. Gross ablation reaches 40 kg m −2 d −1 . Net ablation (July–August), measured as stream discharge, averages 3 600 m 3 d −1 = 9 kg m −2 d −1 . Slow recession is the average condition. Halt stages at 4 800, 4 600 and 4 000 m are interpreted from the topography. Dating of moraines by lichen distribution indicates for the highest of these a minimum age of 400 years. The vertical flux of heat and of water vapour were calculated through an air layer 30–100 cm over a melting firn surface for 24 h. The source of heat available at the surface expressed as a percentage of the total was: net radiation 87, condensation 5, forced convection 1, conduction through snow 6 and unexplained 1. The heat sink was: long-wave radiation 4, evaporation 6, forced convection 6, conduction into snow 2 and melting 82%. |
format |
Article in Journal/Newspaper |
author |
Gilbert, O. Jamieson, D. Lister, H. Pendlington, A. |
author_facet |
Gilbert, O. Jamieson, D. Lister, H. Pendlington, A. |
author_sort |
Gilbert, O. |
title |
Regime of an Afghan Glacier |
title_short |
Regime of an Afghan Glacier |
title_full |
Regime of an Afghan Glacier |
title_fullStr |
Regime of an Afghan Glacier |
title_full_unstemmed |
Regime of an Afghan Glacier |
title_sort |
regime of an afghan glacier |
publisher |
Cambridge University Press (CUP) |
publishDate |
1969 |
url |
http://dx.doi.org/10.1017/s0022143000020761 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000020761 |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
Journal of Glaciology volume 8, issue 52, page 51-65 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000020761 |
container_title |
Journal of Glaciology |
container_volume |
8 |
container_issue |
52 |
container_start_page |
51 |
op_container_end_page |
65 |
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1792502012376514560 |