Reconstruction of the 1979?2006 Greenland ice sheet surface mass balance using the regional climate model MAR
International audience Results from a 28-year simulation (1979?2006) over the Greenland ice sheet (GrIS) reveal an increase of solid precipitation (+0.4±2.5 km 3 yr ?2 ) and run-off (+7.9±3.3 km 3 yr ?2 ) of surface meltwater. The net effect of these competing factors is a significant Surface Mass B...
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ftccsdartic:oai:HAL:hal-00298504v1 2023-05-15T16:28:31+02:00 Reconstruction of the 1979?2006 Greenland ice sheet surface mass balance using the regional climate model MAR Fettweis, X. Institut d'Astronomie et de Géophysique Georges Lemaître (UCL-ASTR) Université Catholique de Louvain = Catholic University of Louvain (UCL) 2007-10-31 https://hal.archives-ouvertes.fr/hal-00298504 https://hal.archives-ouvertes.fr/hal-00298504/document https://hal.archives-ouvertes.fr/hal-00298504/file/tc-1-21-2007.pdf en eng HAL CCSD Copernicus hal-00298504 https://hal.archives-ouvertes.fr/hal-00298504 https://hal.archives-ouvertes.fr/hal-00298504/document https://hal.archives-ouvertes.fr/hal-00298504/file/tc-1-21-2007.pdf info:eu-repo/semantics/OpenAccess ISSN: 1994-0424 EISSN: 1994-0416 The Cryosphere https://hal.archives-ouvertes.fr/hal-00298504 The Cryosphere, Copernicus 2007, 1 (1), pp.21-40 [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2007 ftccsdartic 2021-10-03T00:43:25Z International audience Results from a 28-year simulation (1979?2006) over the Greenland ice sheet (GrIS) reveal an increase of solid precipitation (+0.4±2.5 km 3 yr ?2 ) and run-off (+7.9±3.3 km 3 yr ?2 ) of surface meltwater. The net effect of these competing factors is a significant Surface Mass Balance (SMB) loss of ?7.2±5.1 km 3 yr ?2 . The contribution of changes in the net water vapour flux (+0.02±0.09 km 3 yr ?2 ) and rainfall (+0.2±0.2 km 3 yr ?2 ) to the SMB variability is negligible. The meltwater supply has increased because the GrIS surface has been warming up +2.4°C since 1979. Sensible heat flux, latent heat flux and net solar radiation have not varied significantly over the last three decades. However, the simulated downward infrared flux has increased by 9.3 W m ?2 since 1979. The natural climate variability (e.g. the North Atlantic Oscillation) does not explain these changes. The recent global warming, due to the greenhouse gas concentration increase induced by human activities, could be a cause of these changes. The doubling of surface meltwater flux into the ocean over the period 1979?2006 suggests that the overall ice sheet mass balance has been increasingly negative, given the likely meltwater-induced acceleration of outlet glaciers. This study suggests that increased melting overshadows over an increased accumulation in a warming scenario and that the GrIS is likely to keep losing mass in the future. An enduring GrIS melting will probably affect in the future an certain effect on the stability of the thermohaline circulation and the global sea level rise. Article in Journal/Newspaper Greenland Ice Sheet North Atlantic North Atlantic oscillation The Cryosphere Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Greenland |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Fettweis, X. Reconstruction of the 1979?2006 Greenland ice sheet surface mass balance using the regional climate model MAR |
topic_facet |
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience Results from a 28-year simulation (1979?2006) over the Greenland ice sheet (GrIS) reveal an increase of solid precipitation (+0.4±2.5 km 3 yr ?2 ) and run-off (+7.9±3.3 km 3 yr ?2 ) of surface meltwater. The net effect of these competing factors is a significant Surface Mass Balance (SMB) loss of ?7.2±5.1 km 3 yr ?2 . The contribution of changes in the net water vapour flux (+0.02±0.09 km 3 yr ?2 ) and rainfall (+0.2±0.2 km 3 yr ?2 ) to the SMB variability is negligible. The meltwater supply has increased because the GrIS surface has been warming up +2.4°C since 1979. Sensible heat flux, latent heat flux and net solar radiation have not varied significantly over the last three decades. However, the simulated downward infrared flux has increased by 9.3 W m ?2 since 1979. The natural climate variability (e.g. the North Atlantic Oscillation) does not explain these changes. The recent global warming, due to the greenhouse gas concentration increase induced by human activities, could be a cause of these changes. The doubling of surface meltwater flux into the ocean over the period 1979?2006 suggests that the overall ice sheet mass balance has been increasingly negative, given the likely meltwater-induced acceleration of outlet glaciers. This study suggests that increased melting overshadows over an increased accumulation in a warming scenario and that the GrIS is likely to keep losing mass in the future. An enduring GrIS melting will probably affect in the future an certain effect on the stability of the thermohaline circulation and the global sea level rise. |
author2 |
Institut d'Astronomie et de Géophysique Georges Lemaître (UCL-ASTR) Université Catholique de Louvain = Catholic University of Louvain (UCL) |
format |
Article in Journal/Newspaper |
author |
Fettweis, X. |
author_facet |
Fettweis, X. |
author_sort |
Fettweis, X. |
title |
Reconstruction of the 1979?2006 Greenland ice sheet surface mass balance using the regional climate model MAR |
title_short |
Reconstruction of the 1979?2006 Greenland ice sheet surface mass balance using the regional climate model MAR |
title_full |
Reconstruction of the 1979?2006 Greenland ice sheet surface mass balance using the regional climate model MAR |
title_fullStr |
Reconstruction of the 1979?2006 Greenland ice sheet surface mass balance using the regional climate model MAR |
title_full_unstemmed |
Reconstruction of the 1979?2006 Greenland ice sheet surface mass balance using the regional climate model MAR |
title_sort |
reconstruction of the 1979?2006 greenland ice sheet surface mass balance using the regional climate model mar |
publisher |
HAL CCSD |
publishDate |
2007 |
url |
https://hal.archives-ouvertes.fr/hal-00298504 https://hal.archives-ouvertes.fr/hal-00298504/document https://hal.archives-ouvertes.fr/hal-00298504/file/tc-1-21-2007.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet North Atlantic North Atlantic oscillation The Cryosphere |
genre_facet |
Greenland Ice Sheet North Atlantic North Atlantic oscillation The Cryosphere |
op_source |
ISSN: 1994-0424 EISSN: 1994-0416 The Cryosphere https://hal.archives-ouvertes.fr/hal-00298504 The Cryosphere, Copernicus 2007, 1 (1), pp.21-40 |
op_relation |
hal-00298504 https://hal.archives-ouvertes.fr/hal-00298504 https://hal.archives-ouvertes.fr/hal-00298504/document https://hal.archives-ouvertes.fr/hal-00298504/file/tc-1-21-2007.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1766018180673699840 |