Greenland ice sheet surface mass balance: evaluating simulations and making projections with regional climate models
| Autor: | Rae, J.G.L., Aðalgeirsdóttir, G., Edwards, T.L., Fettweis, X., Gregory, J.M., Hewitt, H.T., Lowe, J.A., Lucas-Picher, P., Mottram, R.H., Payne, A.J., Ridley, J.K., Shannon, S.R., van de Berg, W.J., van de Wal, R.S.W., van den Broeke, M.R., Marine and Atmospheric Research, Sub Dynamics Meteorology, Dep Natuurkunde |
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| Přispěvatelé: | Marine and Atmospheric Research, Sub Dynamics Meteorology, Dep Natuurkunde |
| Rok vydání: | 2012 |
| Předmět: |
lcsh:GE1-350
geography geography.geographical_feature_category 010504 meteorology & atmospheric sciences lcsh:QE1-996.5 Greenland ice sheet Albedo Snow 010502 geochemistry & geophysics 01 natural sciences lcsh:Geology Glacier mass balance 13. Climate action Climatology Climate model Ice sheet Meltwater Sea level lcsh:Environmental sciences Earth-Surface Processes Water Science and Technology 0105 earth and related environmental sciences |
| Zdroj: | Rae, J G L, Aoalgeirsdóttir, G, Edwards, T L, Fettweis, X, Gregory, J M, Hewitt, H T, Lowe, J A, Lucas-Picher, P, Mottram, R H, Payne, A J, Ridley, J K, Shannon, S R, Van De Berg, W J, Van De Wal, R S W & Van Den Broeke, M R 2012, ' Greenland ice sheet surface mass balance : Evaluating simulations and making projections with regional climate models ', The Cryosphere, vol. 6, no. 6, pp. 1275-1294 . https://doi.org/10.5194/tc-6-1275-2012 The Cryosphere, Vol 6, Iss 6, Pp 1275-1294 (2012) The Cryosphere, 6, 1275. Copernicus Publications |
| ISSN: | 1994-0424 1994-0416 |
| DOI: | 10.5194/tcd-6-2059-2012 |
| Popis: | Four high-resolution regional climate models (RCMs) have been set up for the area of Greenland, with the aim of providing future projections of Greenland ice sheet surface mass balance (SMB), and its contribution to sea level rise, with greater accuracy than is possible from coarser-resolution general circulation models (GCMs). This is the first time an intercomparison has been carried out of RCM results for Greenland climate and SMB. Output from RCM simulations for the recent past with the four RCMs is evaluated against available observations. The evaluation highlights the importance of using a detailed snow physics scheme, especially regarding the representations of albedo and meltwater refreezing. Simulations with three of the RCMs for the 21st century using SRES scenario A1B from two GCMs produce trends of between −5.5 and −1.1 Gt yr−2 in SMB (equivalent to +0.015 and +0.003 mm sea level equivalent yr−2), with trends of smaller magnitude for scenario E1, in which emissions are mitigated. Results from one of the RCMs whose present-day simulation is most realistic indicate that an annual-mean near-surface air temperature increase over Greenland of ~2 ○C would be required for the mass loss to increase such that it exceeds accumulation, thereby causing the SMB to become negative, which has been suggested as a threshold beyond which the ice-sheet would eventually be eliminated. |
| Databáze: | OpenAIRE |
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