Future projections of the Greenland ice sheet energy balance driving the surface melt
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...
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fttriple:oai:gotriple.eu:oai:doaj.org/article:3653492403b241dab709df0df7efaa0f 2023-05-15T16:28:32+02:00 Future projections of the Greenland ice sheet energy balance driving the surface melt B. Franco X. Fettweis M. Erpicum 2013-01-01 https://doi.org/10.5194/tc-7-1-2013 http://www.the-cryosphere.net/7/1/2013/tc-7-1-2013.pdf https://doaj.org/article/3653492403b241dab709df0df7efaa0f en eng Copernicus Publications doi:10.5194/tc-7-1-2013 1994-0416 1994-0424 http://www.the-cryosphere.net/7/1/2013/tc-7-1-2013.pdf https://doaj.org/article/3653492403b241dab709df0df7efaa0f undefined The Cryosphere, Vol 7, Iss 1, Pp 1-18 (2013) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2013 fttriple https://doi.org/10.5194/tc-7-1-2013 2023-01-22T18:11:06Z 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. Article in Journal/Newspaper Greenland Ice Sheet The Cryosphere Unknown Greenland The Cryosphere 7 1 1 18 |
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English |
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geo envir B. Franco X. Fettweis M. Erpicum Future projections of the Greenland ice sheet energy balance driving the surface melt |
topic_facet |
geo envir |
description |
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. |
format |
Article in Journal/Newspaper |
author |
B. Franco X. Fettweis M. Erpicum |
author_facet |
B. Franco X. Fettweis M. Erpicum |
author_sort |
B. Franco |
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 |
publisher |
Copernicus Publications |
publishDate |
2013 |
url |
https://doi.org/10.5194/tc-7-1-2013 http://www.the-cryosphere.net/7/1/2013/tc-7-1-2013.pdf https://doaj.org/article/3653492403b241dab709df0df7efaa0f |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet The Cryosphere |
genre_facet |
Greenland Ice Sheet The Cryosphere |
op_source |
The Cryosphere, Vol 7, Iss 1, Pp 1-18 (2013) |
op_relation |
doi:10.5194/tc-7-1-2013 1994-0416 1994-0424 http://www.the-cryosphere.net/7/1/2013/tc-7-1-2013.pdf https://doaj.org/article/3653492403b241dab709df0df7efaa0f |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/tc-7-1-2013 |
container_title |
The Cryosphere |
container_volume |
7 |
container_issue |
1 |
container_start_page |
1 |
op_container_end_page |
18 |
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1766018200385880064 |