气候变化领域集成服务门户(CCPortal): Sensitivity of the current Antarctic surface mass balance to sea surface conditions using MAR

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DOI	10.5194/tc-12-3827-2018
	Sensitivity of the current Antarctic surface mass balance to sea surface conditions using MAR
	Kittel C.; Amory C.; Agosta C.; Delhasse A.; Doutreloup S.; Huot P.-V.; Wyard C.; Fichefet T.; Fettweis X.
发表日期	2018
ISSN	19940416
卷号	12 期号:12
英文摘要	Estimates for the recent period and projections of the Antarctic surface mass balance (SMB) often rely on high-resolution polar-oriented regional climate models (RCMs). However, RCMs require large-scale boundary forcing fields prescribed by reanalyses or general circulation models (GCMs). Since the recent variability of sea surface conditions (SSCs, namely sea ice concentration, SIC, and sea surface temperature, SST) over the Southern Ocean is not reproduced by most GCMs from the 5th phase of the Coupled Model Intercomparison Project (CMIP5), RCMs are then subject to potential biases. We investigate here the direct sensitivity of the Antarctic SMB to SSC perturbations around the Antarctic. With the RCM "Modèle Atmosphérique Régional" (MAR), different sensitivity experiments are performed over 1979-2015 by modifying the ERA-Interim SSCs with (i) homogeneous perturbations and (ii) mean anomalies estimated from all CMIP5 models and two extreme ones, while atmospheric lateral boundary conditions remained unchanged. Results show increased (decreased) precipitation due to perturbations inducing warmer, i.e. higher SST and lower SIC (colder, i.e. lower SST and higher SIC), SSCs than ERA-Interim, significantly affecting the SMB of coastal areas, as precipitation is mainly related to cyclones that do not penetrate far into the continent. At the continental scale, significant SMB anomalies (i.e greater than the interannual variability) are found for the largest combined SST/SIC perturbations. This is notably due to moisture anomalies above the ocean, reaching sufficiently high atmospheric levels to influence accumulation rates further inland. Sensitivity experiments with warmer SSCs based on the CMIP5 biases reveal integrated SMB anomalies (+5 % to +13 %) over the present climate (1979-2015) in the lower range of the SMB increase projected for the end of the 21st century.. © Author(s) 2018.
学科领域	air-sea interaction; boundary condition; climate modeling; CMIP; general circulation model; mass balance; precipitation (climatology); regional climate; sea ice; sea surface temperature; sensitivity analysis; Antarctica; Southern Ocean
语种	英语
scopus关键词	air-sea interaction; boundary condition; climate modeling; CMIP; general circulation model; mass balance; precipitation (climatology); regional climate; sea ice; sea surface temperature; sensitivity analysis; Antarctica; Southern Ocean
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/119017
作者单位	Laboratory of Climatology, Department of Geography, University of Liège, Liège, Belgium; Laboratoire des Sciences du Climat et de l'Environnement, Gif-sur-Yvette, France; Earth and Climate, Earth and Life Institute, Catholic University of Louvain, Louvain-la-Neuve, Belgium
推荐引用方式 GB/T 7714	Kittel C.,Amory C.,Agosta C.,et al. Sensitivity of the current Antarctic surface mass balance to sea surface conditions using MAR[J],2018,12(12).
APA	Kittel C..,Amory C..,Agosta C..,Delhasse A..,Doutreloup S..,...&Fettweis X..(2018).Sensitivity of the current Antarctic surface mass balance to sea surface conditions using MAR.Cryosphere,12(12).
MLA	Kittel C.,et al."Sensitivity of the current Antarctic surface mass balance to sea surface conditions using MAR".Cryosphere 12.12(2018).