Modelling of large-scale melt parameters with a regional climate model in south Greenland during the 1991 melt season
Large-scale positive degree-day based melt parameterizations for the Greenland ice sheet are highly sensitive to their parameters (standard temperature deviation, snow and ice degree-day factors). In this paper, these parameters are simulated with a coupled atmosphere-snow regional climate model for...
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Online Access: | http://hdl.handle.net/2078.1/61600 https://doi.org/10.3189/172756402781816889 |
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ftunivlouvain:oai:dial.uclouvain.be:boreal:61600 2024-05-12T07:53:04+00:00 Modelling of large-scale melt parameters with a regional climate model in south Greenland during the 1991 melt season Lefebre, F. Gallee, H. van Ypersele de Strihou, Jean-Pascal Huybrechts, P. International Symposium on Ice Cores and Climate UCL - SC/PHYS - Département de physique 2002 http://hdl.handle.net/2078.1/61600 https://doi.org/10.3189/172756402781816889 eng eng Int Glaciological Soc boreal:61600 http://hdl.handle.net/2078.1/61600 doi:10.3189/172756402781816889 urn:ISSN:0260-3055 urn:EISSN:1727-5644 Annals of Glaciology, Vol. 35, p. 391-397 (2002) info:eu-repo/semantics/conferenceObject 2002 ftunivlouvain https://doi.org/10.3189/172756402781816889 2024-04-17T17:29:52Z Large-scale positive degree-day based melt parameterizations for the Greenland ice sheet are highly sensitive to their parameters (standard temperature deviation, snow and ice degree-day factors). In this paper, these parameters are simulated with a coupled atmosphere-snow regional climate model for southern Greenland during summer 1991, forced at the lateral boundaries with European Centre for Medium-Range Weather Forecasts re-analyses at a high horizontal resolution of 20 kin. The calculated (from net ablation, i.e. melt minus refreezing) snow and ice positive degree-day factors vary considerably over the ice sheet. At low elevations, the modelled snow degree-day factor closely approaches the generally accepted value of 3 mm w.e. d(-1) degreesC(-1). Higher up the ice sheet, large values up to 15 mm w.e. d(-1) degreesC(-1) are simulated. For ice melt, maximum values of 40 mm w.e. d(-1) degreesC(-1) are found. The snow and Ice positive degree-day factor distributions peak, respectively, at 3 and 8 mm w.e. d(-1) degreesC(-1). Refreezing is of small importance close to the ice-sheet margin. Higher up the ice sheet, refreezing considerably lowers the amount of net ablation. The monthly simulated 2 in air-temperature standard deviation exhibits a strong seasonal cycle, with the highest (3.0-5.0degreesC) values in May and June. July shows the lowest temperature fluctuations, due to the melting of the surface. Conference Object Annals of Glaciology Greenland Ice Sheet DIAL@UCLouvain (Université catholique de Louvain) Greenland Annals of Glaciology 35 391 397 |
institution |
Open Polar |
collection |
DIAL@UCLouvain (Université catholique de Louvain) |
op_collection_id |
ftunivlouvain |
language |
English |
description |
Large-scale positive degree-day based melt parameterizations for the Greenland ice sheet are highly sensitive to their parameters (standard temperature deviation, snow and ice degree-day factors). In this paper, these parameters are simulated with a coupled atmosphere-snow regional climate model for southern Greenland during summer 1991, forced at the lateral boundaries with European Centre for Medium-Range Weather Forecasts re-analyses at a high horizontal resolution of 20 kin. The calculated (from net ablation, i.e. melt minus refreezing) snow and ice positive degree-day factors vary considerably over the ice sheet. At low elevations, the modelled snow degree-day factor closely approaches the generally accepted value of 3 mm w.e. d(-1) degreesC(-1). Higher up the ice sheet, large values up to 15 mm w.e. d(-1) degreesC(-1) are simulated. For ice melt, maximum values of 40 mm w.e. d(-1) degreesC(-1) are found. The snow and Ice positive degree-day factor distributions peak, respectively, at 3 and 8 mm w.e. d(-1) degreesC(-1). Refreezing is of small importance close to the ice-sheet margin. Higher up the ice sheet, refreezing considerably lowers the amount of net ablation. The monthly simulated 2 in air-temperature standard deviation exhibits a strong seasonal cycle, with the highest (3.0-5.0degreesC) values in May and June. July shows the lowest temperature fluctuations, due to the melting of the surface. |
author2 |
UCL - SC/PHYS - Département de physique |
format |
Conference Object |
author |
Lefebre, F. Gallee, H. van Ypersele de Strihou, Jean-Pascal Huybrechts, P. International Symposium on Ice Cores and Climate |
spellingShingle |
Lefebre, F. Gallee, H. van Ypersele de Strihou, Jean-Pascal Huybrechts, P. International Symposium on Ice Cores and Climate Modelling of large-scale melt parameters with a regional climate model in south Greenland during the 1991 melt season |
author_facet |
Lefebre, F. Gallee, H. van Ypersele de Strihou, Jean-Pascal Huybrechts, P. International Symposium on Ice Cores and Climate |
author_sort |
Lefebre, F. |
title |
Modelling of large-scale melt parameters with a regional climate model in south Greenland during the 1991 melt season |
title_short |
Modelling of large-scale melt parameters with a regional climate model in south Greenland during the 1991 melt season |
title_full |
Modelling of large-scale melt parameters with a regional climate model in south Greenland during the 1991 melt season |
title_fullStr |
Modelling of large-scale melt parameters with a regional climate model in south Greenland during the 1991 melt season |
title_full_unstemmed |
Modelling of large-scale melt parameters with a regional climate model in south Greenland during the 1991 melt season |
title_sort |
modelling of large-scale melt parameters with a regional climate model in south greenland during the 1991 melt season |
publisher |
Int Glaciological Soc |
publishDate |
2002 |
url |
http://hdl.handle.net/2078.1/61600 https://doi.org/10.3189/172756402781816889 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Annals of Glaciology Greenland Ice Sheet |
genre_facet |
Annals of Glaciology Greenland Ice Sheet |
op_source |
Annals of Glaciology, Vol. 35, p. 391-397 (2002) |
op_relation |
boreal:61600 http://hdl.handle.net/2078.1/61600 doi:10.3189/172756402781816889 urn:ISSN:0260-3055 urn:EISSN:1727-5644 |
op_doi |
https://doi.org/10.3189/172756402781816889 |
container_title |
Annals of Glaciology |
container_volume |
35 |
container_start_page |
391 |
op_container_end_page |
397 |
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1798840750739292160 |