Future projections of the Greenland ice sheet energy balance driving the surface melt
Abstract. In this study, simulations at 25 km resolution are performed over the Greenland ice sheet (GrIS) throughout the 20th and 21st centuries, using the regional climate model MAR forced by four RCP scenarios from three CMIP5 global circulation models (GCMs), in order to investigate the projecte...
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ftunivbruxelles:oai:dipot.ulb.ac.be:2013/336023 2023-05-15T16:28:27+02:00 Future projections of the Greenland ice sheet energy balance driving the surface melt Franco, Bruno Fettweis, Xavier Erpicum, M. 2013-01-02 1 full-text file(s): application/pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/336023 https://dipot.ulb.ac.be/dspace/bitstream/2013/336023/1/doi_319667.pdf en eng uri/info:doi/10.5194/tc-7-1-2013 https://dipot.ulb.ac.be/dspace/bitstream/2013/336023/1/doi_319667.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/336023 1 full-text file(s): info:eu-repo/semantics/openAccess The Cryosphere, 7 (1 Sciences exactes et naturelles info:eu-repo/semantics/article info:ulb-repo/semantics/articlePeerReview info:ulb-repo/semantics/openurl/article 2013 ftunivbruxelles 2022-06-12T22:07:56Z Abstract. In this study, simulations at 25 km resolution are performed over the Greenland ice sheet (GrIS) throughout the 20th and 21st centuries, using the regional climate model MAR forced by four RCP scenarios from three CMIP5 global circulation models (GCMs), in order to investigate the projected changes of the surface energy balance (SEB) components driving the surface melt. Analysis of 2000–2100 melt anomalies compared to melt results over 1980–1999 reveals an exponential relationship of the GrIS surface melt rate simulated by MAR to the near-surface air temperature (TAS) anomalies, mainly due to the surface albedo positive feedback associated with the extension of bare ice areas in summer. On the GrIS margins, the future melt anomalies are preferentially driven by stronger sensible heat fluxes, induced by enhanced warm air advection over the ice sheet. Over the central dry snow zone, the surface albedo positive feedback induced by the increase in summer melt exceeds the negative feedback of heavier snowfall for TAS anomalies higher than 4 °C. In addition to the incoming longwave flux increase associated with the atmosphere warming, GCM-forced MAR simulations project an increase of the cloud cover decreasing the ratio of the incoming shortwave versus longwave radiation and dampening the albedo feedback. However, it should be noted that this trend in the cloud cover is contrary to that simulated by ERA-Interim–forced MAR for recent climate conditions, where the observed melt increase since the 1990s seems mainly to be a consequence of more anticyclonic atmospheric conditions. Finally, no significant change is projected in the length of the melt season, which highlights the importance of solar radiation absorbed by the ice sheet surface in the melt SEB. info:eu-repo/semantics/published Article in Journal/Newspaper Greenland Ice Sheet The Cryosphere DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) Greenland |
institution |
Open Polar |
collection |
DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) |
op_collection_id |
ftunivbruxelles |
language |
English |
topic |
Sciences exactes et naturelles |
spellingShingle |
Sciences exactes et naturelles Franco, Bruno Fettweis, Xavier Erpicum, M. Future projections of the Greenland ice sheet energy balance driving the surface melt |
topic_facet |
Sciences exactes et naturelles |
description |
Abstract. In this study, simulations at 25 km resolution are performed over the Greenland ice sheet (GrIS) throughout the 20th and 21st centuries, using the regional climate model MAR forced by four RCP scenarios from three CMIP5 global circulation models (GCMs), in order to investigate the projected changes of the surface energy balance (SEB) components driving the surface melt. Analysis of 2000–2100 melt anomalies compared to melt results over 1980–1999 reveals an exponential relationship of the GrIS surface melt rate simulated by MAR to the near-surface air temperature (TAS) anomalies, mainly due to the surface albedo positive feedback associated with the extension of bare ice areas in summer. On the GrIS margins, the future melt anomalies are preferentially driven by stronger sensible heat fluxes, induced by enhanced warm air advection over the ice sheet. Over the central dry snow zone, the surface albedo positive feedback induced by the increase in summer melt exceeds the negative feedback of heavier snowfall for TAS anomalies higher than 4 °C. In addition to the incoming longwave flux increase associated with the atmosphere warming, GCM-forced MAR simulations project an increase of the cloud cover decreasing the ratio of the incoming shortwave versus longwave radiation and dampening the albedo feedback. However, it should be noted that this trend in the cloud cover is contrary to that simulated by ERA-Interim–forced MAR for recent climate conditions, where the observed melt increase since the 1990s seems mainly to be a consequence of more anticyclonic atmospheric conditions. Finally, no significant change is projected in the length of the melt season, which highlights the importance of solar radiation absorbed by the ice sheet surface in the melt SEB. info:eu-repo/semantics/published |
format |
Article in Journal/Newspaper |
author |
Franco, Bruno Fettweis, Xavier Erpicum, M. |
author_facet |
Franco, Bruno Fettweis, Xavier Erpicum, M. |
author_sort |
Franco, Bruno |
title |
Future projections of the Greenland ice sheet energy balance driving the surface melt |
title_short |
Future projections of the Greenland ice sheet energy balance driving the surface melt |
title_full |
Future projections of the Greenland ice sheet energy balance driving the surface melt |
title_fullStr |
Future projections of the Greenland ice sheet energy balance driving the surface melt |
title_full_unstemmed |
Future projections of the Greenland ice sheet energy balance driving the surface melt |
title_sort |
future projections of the greenland ice sheet energy balance driving the surface melt |
publishDate |
2013 |
url |
http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/336023 https://dipot.ulb.ac.be/dspace/bitstream/2013/336023/1/doi_319667.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet The Cryosphere |
genre_facet |
Greenland Ice Sheet The Cryosphere |
op_source |
The Cryosphere, 7 (1 |
op_relation |
uri/info:doi/10.5194/tc-7-1-2013 https://dipot.ulb.ac.be/dspace/bitstream/2013/336023/1/doi_319667.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/336023 |
op_rights |
1 full-text file(s): info:eu-repo/semantics/openAccess |
_version_ |
1766018105402720256 |