Below-surface ice melt on the coastal Antarctic ice sheet
Abstract In the Jutulgryta area of Dronning Maud Land, Antarctica, subsurface melting of the ice sheet has been observed. The melting takes place during the summer months in blue-ice areas under conditions of below-freezing air and surface temperatures. Adjacent snow-covered regions, having the same...
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Online Access: | http://dx.doi.org/10.1017/s0022143000001775 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000001775 |
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crcambridgeupr:10.1017/s0022143000001775 2024-03-03T08:38:36+00:00 Below-surface ice melt on the coastal Antarctic ice sheet Liston, Glen E. Winther, Jan-Gunnar Bruland, Oddbjørn Elvehøy, Hallgeir Sand, Knut 1999 http://dx.doi.org/10.1017/s0022143000001775 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000001775 en eng Cambridge University Press (CUP) Journal of Glaciology volume 45, issue 150, page 273-285 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1999 crcambridgeupr https://doi.org/10.1017/s0022143000001775 2024-02-08T08:36:10Z Abstract In the Jutulgryta area of Dronning Maud Land, Antarctica, subsurface melting of the ice sheet has been observed. The melting takes place during the summer months in blue-ice areas under conditions of below-freezing air and surface temperatures. Adjacent snow-covered regions, having the same meteorological and climatic conditions, experience little or no subsurface melting. To help explain and understand the observed melt-rate differences in the blue-ice and snow-covered areas, a physically based numerical model of the coupled atmosphere, radiation, snow and blue-ice system has been developed. The model comprises a heat-transfer equation which includes a spectrally dependent solar-radiation source term. The penetration of radiation into the snow and blue ice depends on the solar-radiation spectrum, the surface albedo and the snow and blue-ice grain-sizes and densities. In addition, the model uses a complete surface energy balance to define the surface boundary conditions. It is run over the full annual cycle, simulating temperature profiles and melting and freezing quantities throughout the summer and winter seasons. The model is driven and validated using field observations collected during the Norwegian Antarctic Research Expedition (NARE) 1996–97. The simulations suggest that the observed differences between subsurface snow and blue-ice melting can be explained largely by radiative and heat-transfer interactions resulting from differences in albedo, grain-size and density between the two mediums. Article in Journal/Newspaper Antarc* Antarctic Antarctica Dronning Maud Land Ice Sheet Journal of Glaciology Cambridge University Press Antarctic Dronning Maud Land Jutulgryta ENVELOPE(0.417,0.417,-71.250,-71.250) Journal of Glaciology 45 150 273 285 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Liston, Glen E. Winther, Jan-Gunnar Bruland, Oddbjørn Elvehøy, Hallgeir Sand, Knut Below-surface ice melt on the coastal Antarctic ice sheet |
topic_facet |
Earth-Surface Processes |
description |
Abstract In the Jutulgryta area of Dronning Maud Land, Antarctica, subsurface melting of the ice sheet has been observed. The melting takes place during the summer months in blue-ice areas under conditions of below-freezing air and surface temperatures. Adjacent snow-covered regions, having the same meteorological and climatic conditions, experience little or no subsurface melting. To help explain and understand the observed melt-rate differences in the blue-ice and snow-covered areas, a physically based numerical model of the coupled atmosphere, radiation, snow and blue-ice system has been developed. The model comprises a heat-transfer equation which includes a spectrally dependent solar-radiation source term. The penetration of radiation into the snow and blue ice depends on the solar-radiation spectrum, the surface albedo and the snow and blue-ice grain-sizes and densities. In addition, the model uses a complete surface energy balance to define the surface boundary conditions. It is run over the full annual cycle, simulating temperature profiles and melting and freezing quantities throughout the summer and winter seasons. The model is driven and validated using field observations collected during the Norwegian Antarctic Research Expedition (NARE) 1996–97. The simulations suggest that the observed differences between subsurface snow and blue-ice melting can be explained largely by radiative and heat-transfer interactions resulting from differences in albedo, grain-size and density between the two mediums. |
format |
Article in Journal/Newspaper |
author |
Liston, Glen E. Winther, Jan-Gunnar Bruland, Oddbjørn Elvehøy, Hallgeir Sand, Knut |
author_facet |
Liston, Glen E. Winther, Jan-Gunnar Bruland, Oddbjørn Elvehøy, Hallgeir Sand, Knut |
author_sort |
Liston, Glen E. |
title |
Below-surface ice melt on the coastal Antarctic ice sheet |
title_short |
Below-surface ice melt on the coastal Antarctic ice sheet |
title_full |
Below-surface ice melt on the coastal Antarctic ice sheet |
title_fullStr |
Below-surface ice melt on the coastal Antarctic ice sheet |
title_full_unstemmed |
Below-surface ice melt on the coastal Antarctic ice sheet |
title_sort |
below-surface ice melt on the coastal antarctic ice sheet |
publisher |
Cambridge University Press (CUP) |
publishDate |
1999 |
url |
http://dx.doi.org/10.1017/s0022143000001775 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000001775 |
long_lat |
ENVELOPE(0.417,0.417,-71.250,-71.250) |
geographic |
Antarctic Dronning Maud Land Jutulgryta |
geographic_facet |
Antarctic Dronning Maud Land Jutulgryta |
genre |
Antarc* Antarctic Antarctica Dronning Maud Land Ice Sheet Journal of Glaciology |
genre_facet |
Antarc* Antarctic Antarctica Dronning Maud Land Ice Sheet Journal of Glaciology |
op_source |
Journal of Glaciology volume 45, issue 150, page 273-285 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000001775 |
container_title |
Journal of Glaciology |
container_volume |
45 |
container_issue |
150 |
container_start_page |
273 |
op_container_end_page |
285 |
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1792507007852347392 |