Modelling Antarctic and Greenland sea-level contributions during the 20th and 21st centuries forced by AOGCM time slice integrations
Volume changes of the Greenland and Antarctic ice sheets have the potential to significantly contribute to global sea-level changes in future warmer climates. The most crucial aspects are how climatic changes will affect the ice sheet's mass balance and how ice dynamics will react to the impose...
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ftawi:oai:epic.awi.de:6970 2023-09-05T13:13:58+02:00 Modelling Antarctic and Greenland sea-level contributions during the 20th and 21st centuries forced by AOGCM time slice integrations Huybrechts, Philippe Gregory, J. Janssens, I. Wild, M. 2002 https://epic.awi.de/id/eprint/6970/ https://hdl.handle.net/10013/epic.17517 unknown Huybrechts, P. , Gregory, J. , Janssens, I. and Wild, M. (2002) Modelling Antarctic and Greenland sea-level contributions during the 20th and 21st centuries forced by AOGCM time slice integrations , European Geophysical Society XXVII General Assembly, Nice (F)April 2002. . hdl:10013/epic.17517 EPIC3European Geophysical Society XXVII General Assembly, Nice (F)April 2002., 21 Conference notRev 2002 ftawi 2023-08-22T19:46:28Z Volume changes of the Greenland and Antarctic ice sheets have the potential to significantly contribute to global sea-level changes in future warmer climates. The most crucial aspects are how climatic changes will affect the ice sheet's mass balance and how ice dynamics will react to the imposed environmental forcing. This is in addition to the longer-term background trend from adjustments as far back as the last glacial period. Here we focus on model predictions for the 20th and 21st centuries using 3-D thermomechanical ice sheet/ice shelf models driven by climate scenarios obtained from AOGCMs. We scaled high-resolution patterns from the ECHAM4 and HadAM3 time slice integrations with time series from a variety of lower-resolution AOGCM runs to obtain the spread of results for a similar emission scenario. Particular attention is paid to the technique of pattern-scaling and on how GCM based predictions differ from older ice-sheet model results based on more parameterised mass-balance treatments. As a general result, it is found that the effect of increased precipitation on Antarctica clearly dominates over the effect of increased melting on Greenland for the entire range of predictions, implying that both polar ice sheets combined would contribute more negatively to sea-level in the 21st century than often thought. The results are very similar for both time-slice patterns driven by their underlying time evolution series, with most of the scatter in the results provided by the variability in the lower-resolution AOGCMs. These findings will be discussed in the broader framework of current-day model results and of the IPCC TAR sea-level predictions in particular. Conference Object Antarc* Antarctic Antarctica Greenland Greenland Sea Ice Sheet Ice Shelf Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic Greenland |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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description |
Volume changes of the Greenland and Antarctic ice sheets have the potential to significantly contribute to global sea-level changes in future warmer climates. The most crucial aspects are how climatic changes will affect the ice sheet's mass balance and how ice dynamics will react to the imposed environmental forcing. This is in addition to the longer-term background trend from adjustments as far back as the last glacial period. Here we focus on model predictions for the 20th and 21st centuries using 3-D thermomechanical ice sheet/ice shelf models driven by climate scenarios obtained from AOGCMs. We scaled high-resolution patterns from the ECHAM4 and HadAM3 time slice integrations with time series from a variety of lower-resolution AOGCM runs to obtain the spread of results for a similar emission scenario. Particular attention is paid to the technique of pattern-scaling and on how GCM based predictions differ from older ice-sheet model results based on more parameterised mass-balance treatments. As a general result, it is found that the effect of increased precipitation on Antarctica clearly dominates over the effect of increased melting on Greenland for the entire range of predictions, implying that both polar ice sheets combined would contribute more negatively to sea-level in the 21st century than often thought. The results are very similar for both time-slice patterns driven by their underlying time evolution series, with most of the scatter in the results provided by the variability in the lower-resolution AOGCMs. These findings will be discussed in the broader framework of current-day model results and of the IPCC TAR sea-level predictions in particular. |
format |
Conference Object |
author |
Huybrechts, Philippe Gregory, J. Janssens, I. Wild, M. |
spellingShingle |
Huybrechts, Philippe Gregory, J. Janssens, I. Wild, M. Modelling Antarctic and Greenland sea-level contributions during the 20th and 21st centuries forced by AOGCM time slice integrations |
author_facet |
Huybrechts, Philippe Gregory, J. Janssens, I. Wild, M. |
author_sort |
Huybrechts, Philippe |
title |
Modelling Antarctic and Greenland sea-level contributions during the 20th and 21st centuries forced by AOGCM time slice integrations |
title_short |
Modelling Antarctic and Greenland sea-level contributions during the 20th and 21st centuries forced by AOGCM time slice integrations |
title_full |
Modelling Antarctic and Greenland sea-level contributions during the 20th and 21st centuries forced by AOGCM time slice integrations |
title_fullStr |
Modelling Antarctic and Greenland sea-level contributions during the 20th and 21st centuries forced by AOGCM time slice integrations |
title_full_unstemmed |
Modelling Antarctic and Greenland sea-level contributions during the 20th and 21st centuries forced by AOGCM time slice integrations |
title_sort |
modelling antarctic and greenland sea-level contributions during the 20th and 21st centuries forced by aogcm time slice integrations |
publishDate |
2002 |
url |
https://epic.awi.de/id/eprint/6970/ https://hdl.handle.net/10013/epic.17517 |
geographic |
Antarctic Greenland |
geographic_facet |
Antarctic Greenland |
genre |
Antarc* Antarctic Antarctica Greenland Greenland Sea Ice Sheet Ice Shelf |
genre_facet |
Antarc* Antarctic Antarctica Greenland Greenland Sea Ice Sheet Ice Shelf |
op_source |
EPIC3European Geophysical Society XXVII General Assembly, Nice (F)April 2002., 21 |
op_relation |
Huybrechts, P. , Gregory, J. , Janssens, I. and Wild, M. (2002) Modelling Antarctic and Greenland sea-level contributions during the 20th and 21st centuries forced by AOGCM time slice integrations , European Geophysical Society XXVII General Assembly, Nice (F)April 2002. . hdl:10013/epic.17517 |
_version_ |
1776205072080830464 |