DOI: 10.5194/tc-15-3615-2021
论文题名: Significant additional Antarctic warming in atmospheric bias-corrected ARPEGE projections with respect to control run
作者: Beaumet J. ; Déqué M. ; Krinner G. ; Agosta C. ; Alias A. ; Favier V.
刊名: Cryosphere
ISSN: 19940416
出版年: 2021
卷: 15, 期: 8 起始页码: 3615
结束页码: 3635
语种: 英语
英文摘要: In this study, we use run-time bias correction to correct for the Action de Recherche Petite Echelle Grande Echelle (ARPEGE) atmospheric model systematic errors on large-scale atmospheric circulation. The bias-correction terms are built using the climatological mean of the adjustment terms on tendency errors in an ARPEGE simulation relaxed towards ERA-Interim reanalyses. The bias reduction with respect to the Atmospheric Model Intercomparison Project (AMIP)-style uncorrected control run for the general atmospheric circulation in the Southern Hemisphere is significant for mean state and daily variability. Comparisons for the Antarctic Ice Sheet with the polar-oriented regional atmospheric models MAR and RACMO2 and in situ observations also suggest substantial bias reduction for near-surface temperature and precipitation in coastal areas. Applying the method to climate projections for the late 21st century (2071-2100) leads to large differences in the projected changes of the atmospheric circulation in the southern high latitudes and of the Antarctic surface climate. The projected poleward shift and strengthening of the southern westerly winds are greatly reduced. These changes result in a significant 0.7 to 0.9g K additional warming and a 6g % to 9g % additional increase in precipitation over the grounded ice sheet. The sensitivity of precipitation increase to temperature increase (+7.7g %g K-1 and +9g %g K-1) found is also higher than previous estimates. The highest additional warming rates are found over East Antarctica in summer. In winter, there is a dipole of weaker warming and weaker precipitation increase over West Antarctica, contrasted by a stronger warming and a concomitant stronger precipitation increase from Victoria to Adélie Land, associated with a weaker intensification of the Amundsen Sea Low. © Author(s) 2021. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164652
Appears in Collections: 气候变化与战略
There are no files associated with this item.
作者单位: Université Grenoble Alpes, CNRS, Institut des Géosciences de l'Environnement, Grenoble, 38000, France; CNRM, Université de Toulouse, Météo-France, CNRS, Toulouse, France; Laboratoire des Sciences du Climat et de l'Environnement, LSCE-IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, Gif-sur-Yvette, 91190, France
Recommended Citation:
Beaumet J.,Déqué M.,Krinner G.,et al. Significant additional Antarctic warming in atmospheric bias-corrected ARPEGE projections with respect to control run[J]. Cryosphere,2021-01-01,15(8)