A 1 year record of global radiation and albedo in the ablation zone of Morteratschgletscher, Switzerland
Abstract We analyse data on solar radiation measured with an automatic weather station on Morteratschgletscher, Switzerland, for the period 1 October 1995–30 September 1996. The station is in the lower ablation zone. Due to shading by surrounding mountains and atmospheric attenuation, only 49% of th...
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Cambridge University Press (CUP)
1998
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Online Access: | http://dx.doi.org/10.1017/s0022143000002574 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000002574 |
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crcambridgeupr:10.1017/s0022143000002574 2024-06-23T07:54:14+00:00 A 1 year record of global radiation and albedo in the ablation zone of Morteratschgletscher, Switzerland Oerlemans, J. Knap, W. H. 1998 http://dx.doi.org/10.1017/s0022143000002574 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000002574 en eng Cambridge University Press (CUP) Journal of Glaciology volume 44, issue 147, page 231-238 ISSN 0022-1430 1727-5652 journal-article 1998 crcambridgeupr https://doi.org/10.1017/s0022143000002574 2024-06-12T04:04:33Z Abstract We analyse data on solar radiation measured with an automatic weather station on Morteratschgletscher, Switzerland, for the period 1 October 1995–30 September 1996. The station is in the lower ablation zone. Due to shading by surrounding mountains and atmospheric attenuation, only 49% of the annual extraterrestrial irradiance (mean: 292 W m −2 ) reaches the glacier surface. About 48% of this is absorbed at the surface (mean: 79 W m −2 annual albedo of 0.53). We present a simple albedo scheme for use in glacier mass-balance models. We fit the model to the 1 year dataset by optimizing five control parameters (optimal values in brackets): albedo of snow (0.75), albedo of firn (0.53), albedo of ice (0.34), e -folding constant for effect of ageing on snow albedo (21.9 days) and e -folding constant for effect of snow depth on albedo (3.2 cm). The input consists of daily albedo, snow depth and dates of snowfall events. The correlation coefficient between observed and simulated albedo is 0.931, the corresponding rms difference being 0.067. Article in Journal/Newspaper Journal of Glaciology Cambridge University Press Journal of Glaciology 44 147 231 238 |
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Open Polar |
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Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
description |
Abstract We analyse data on solar radiation measured with an automatic weather station on Morteratschgletscher, Switzerland, for the period 1 October 1995–30 September 1996. The station is in the lower ablation zone. Due to shading by surrounding mountains and atmospheric attenuation, only 49% of the annual extraterrestrial irradiance (mean: 292 W m −2 ) reaches the glacier surface. About 48% of this is absorbed at the surface (mean: 79 W m −2 annual albedo of 0.53). We present a simple albedo scheme for use in glacier mass-balance models. We fit the model to the 1 year dataset by optimizing five control parameters (optimal values in brackets): albedo of snow (0.75), albedo of firn (0.53), albedo of ice (0.34), e -folding constant for effect of ageing on snow albedo (21.9 days) and e -folding constant for effect of snow depth on albedo (3.2 cm). The input consists of daily albedo, snow depth and dates of snowfall events. The correlation coefficient between observed and simulated albedo is 0.931, the corresponding rms difference being 0.067. |
format |
Article in Journal/Newspaper |
author |
Oerlemans, J. Knap, W. H. |
spellingShingle |
Oerlemans, J. Knap, W. H. A 1 year record of global radiation and albedo in the ablation zone of Morteratschgletscher, Switzerland |
author_facet |
Oerlemans, J. Knap, W. H. |
author_sort |
Oerlemans, J. |
title |
A 1 year record of global radiation and albedo in the ablation zone of Morteratschgletscher, Switzerland |
title_short |
A 1 year record of global radiation and albedo in the ablation zone of Morteratschgletscher, Switzerland |
title_full |
A 1 year record of global radiation and albedo in the ablation zone of Morteratschgletscher, Switzerland |
title_fullStr |
A 1 year record of global radiation and albedo in the ablation zone of Morteratschgletscher, Switzerland |
title_full_unstemmed |
A 1 year record of global radiation and albedo in the ablation zone of Morteratschgletscher, Switzerland |
title_sort |
1 year record of global radiation and albedo in the ablation zone of morteratschgletscher, switzerland |
publisher |
Cambridge University Press (CUP) |
publishDate |
1998 |
url |
http://dx.doi.org/10.1017/s0022143000002574 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000002574 |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
Journal of Glaciology volume 44, issue 147, page 231-238 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000002574 |
container_title |
Journal of Glaciology |
container_volume |
44 |
container_issue |
147 |
container_start_page |
231 |
op_container_end_page |
238 |
_version_ |
1802646317022838784 |