气候变化领域集成服务门户(CCPortal): Global Warming Threshold and Mechanisms for Accelerated Greenland Ice Sheet Surface Mass Loss

CCPortal

DOI	10.1029/2019MS002029
	Global Warming Threshold and Mechanisms for Accelerated Greenland Ice Sheet Surface Mass Loss
	Sellevold R.; Vizcaíno M.
发表日期	2020
ISSN	19422466
卷号	12 期号:9
英文摘要	The Community Earth System Model version 2.1 (CESM2.1) is used to investigate the evolution of the Greenland ice sheet (GrIS) surface mass balance (SMB) under an idealized CO2 forcing scenario of 1% increase until stabilization at 4× pre-industrial at model year 140. In this simulation, the SMB calculation is coupled with the atmospheric model, using a physically based surface energy balance scheme for melt, explicit calculation of snow albedo, and a realistic treatment of polar snow and firn compaction. By the end of the simulation (years 131–150), the SMB decreases with 994 Gt yr−1 with respect to the pre-industrial SMB, which represents a sea-level rise contribution of 2.8 mm yr−1. For a threshold of 2.7-K global temperature increase with respect to pre-industrial, the rate of expansion of the ablation area increases, the mass loss accelerates due to loss of refreezing capacity and accelerated melt, and the SMB becomes negative 6 years later. Before acceleration, longwave radiation is the most important contributor to increasing energy for melt. After acceleration, the large expansion of the ablation area strongly reduces surface albedo. This and much increased turbulent heat fluxes as the GrIS-integrated summer surface temperature approaches melt point become the major sources of energy for melt. ©2020. The Authors.
语种	英语
scopus关键词	Ablation; Expansion; Glaciers; Global warming; Sea level; Snow; Solar radiation; Atmospheric model; Earth system model; Global temperatures; Greenland Ice Sheet; Long-wave radiation; Surface mass balance; Surface temperatures; Turbulent heat fluxes; Glacial geology; ablation; albedo; energy balance; global warming; longwave radiation; mass balance; sea level change; surface temperature; Arctic; Greenland; Greenland Ice Sheet
来源期刊	Journal of Advances in Modeling Earth Systems
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/156630
作者单位	Geoscience and Remote Sensing, Delft University of Technology, Delft, Netherlands
推荐引用方式 GB/T 7714	Sellevold R.,Vizcaíno M.. Global Warming Threshold and Mechanisms for Accelerated Greenland Ice Sheet Surface Mass Loss[J],2020,12(9).
APA	Sellevold R.,&Vizcaíno M..(2020).Global Warming Threshold and Mechanisms for Accelerated Greenland Ice Sheet Surface Mass Loss.Journal of Advances in Modeling Earth Systems,12(9).
MLA	Sellevold R.,et al."Global Warming Threshold and Mechanisms for Accelerated Greenland Ice Sheet Surface Mass Loss".Journal of Advances in Modeling Earth Systems 12.9(2020).