气候变化领域集成服务门户(CCPortal): Significant additional Antarctic warming in atmospheric bias-corrected ARPEGE projections with respect to control run

CCPortal

DOI	10.5194/tc-15-3615-2021
	Significant additional Antarctic warming in atmospheric bias-corrected ARPEGE projections with respect to control run
	Beaumet J.; Déqué M.; Krinner G.; Agosta C.; Alias A.; Favier V.
发表日期	2021
ISSN	19940416
起始页码	3615
结束页码	3635
卷号	15 期号:8
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.
语种	英语
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202274
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
推荐引用方式 GB/T 7714	Beaumet J.,Déqué M.,Krinner G.,et al. Significant additional Antarctic warming in atmospheric bias-corrected ARPEGE projections with respect to control run[J],2021,15(8).
APA	Beaumet J.,Déqué M.,Krinner G.,Agosta C.,Alias A.,&Favier V..(2021).Significant additional Antarctic warming in atmospheric bias-corrected ARPEGE projections with respect to control run.Cryosphere,15(8).
MLA	Beaumet J.,et al."Significant additional Antarctic warming in atmospheric bias-corrected ARPEGE projections with respect to control run".Cryosphere 15.8(2021).