气候变化领域集成服务门户(CCPortal): Analysis of the surface mass balance for deglacial climate simulations

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DOI	10.5194/tc-15-1131-2021
	Analysis of the surface mass balance for deglacial climate simulations
	Kapsch M.L.; Mikolajewicz U.; Ziemen F.A.; Rodehacke C.B.; Schannwell C.
发表日期	2021
ISSN	19940416
起始页码	1131
结束页码	1156
卷号	15 期号:2
英文摘要	A realistic simulation of the surface mass balance (SMB) is essential for simulating past and future ice-sheet changes. As most state-of-the-art Earth system models (ESMs) are not capable of realistically representing processes determining the SMB, most studies of the SMB are limited to observations and regional climate models and cover the last century and near future only. Using transient simulations with the Max Planck Institute ESM in combination with an energy balance model (EBM), we extend previous research and study changes in the SMB and equilibrium line altitude (ELA) for the Northern Hemisphere ice sheets throughout the last deglaciation. The EBM is used to calculate and downscale the SMB onto a higher spatial resolution than the native ESM grid and allows for the resolution of SMB variations due to topographic gradients not resolved by the ESM. An evaluation for historical climate conditions (1980-2010) shows that derived SMBs compare well with SMBs from regional modeling. Throughout the deglaciation, changes in insolation dominate the Greenland SMB. The increase in insolation and associated warming early in the deglaciation result in an ELA and SMB increase. The SMB increase is caused by compensating effects of melt and accumulation: the warming of the atmosphere leads to an increase in melt at low elevations along the ice-sheet margins, while it results in an increase in accumulation at higher levels as a warmer atmosphere precipitates more. After 13 ka, the increase in melt begins to dominate, and the SMB decreases. The decline in Northern Hemisphere summer insolation after 9 ka leads to an increasing SMB and decreasing ELA. Superimposed on these long-term changes are centennial-scale episodes of abrupt SMB and ELA decreases related to slowdowns of the Atlantic meridional overturning circulation (AMOC) that lead to a cooling over most of the Northern Hemisphere. Copyright © 2021 by ASME.
英文关键词	climate modeling; deglaciation; downscaling; ice sheet; mass balance; Northern Hemisphere; regional climate; spatial resolution
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/202341
作者单位	Max Planck Institute for Meteorology, Bundesstraße 53, Hamburg, 20146, Germany; Danish Meteorological Institute, Lyngbyvej 100, Copenhagen Ø, 2100, Denmark; Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Am Handelshafen 12, Bremerhaven, 27570, Germany; Deutsches Klimarechenzentrum, Bundesstr. 45a, Hamburg, 20146, Germany
推荐引用方式 GB/T 7714	Kapsch M.L.,Mikolajewicz U.,Ziemen F.A.,et al. Analysis of the surface mass balance for deglacial climate simulations[J],2021,15(2).
APA	Kapsch M.L.,Mikolajewicz U.,Ziemen F.A.,Rodehacke C.B.,&Schannwell C..(2021).Analysis of the surface mass balance for deglacial climate simulations.Cryosphere,15(2).
MLA	Kapsch M.L.,et al."Analysis of the surface mass balance for deglacial climate simulations".Cryosphere 15.2(2021).