气候变化领域集成服务门户(CCPortal): Brief communication: Reduction in the future Greenland ice sheet surface melt with the help of solar geoengineering

CCPortal

DOI	10.5194/tc-15-3013-2021
	Brief communication: Reduction in the future Greenland ice sheet surface melt with the help of solar geoengineering
	Fettweis X.; Hofer S.; Séférian R.; Amory C.; Delhasse A.; Doutreloup S.; Kittel C.; Lang C.; Van Bever J.; Veillon F.; Irvine P.
发表日期	2021
ISSN	19940416
起始页码	3013
结束页码	3019
卷号	15 期号:6
英文摘要	The Greenland Ice Sheet (GrIS) will be losing mass at an accelerating pace throughout the 21st century, with a direct link between anthropogenic greenhouse gas emissions and the magnitude of Greenland mass loss. Currently, approximately 60% of the mass loss contribution comes from surface melt and subsequent meltwater runoff, while 40% are due to ice calving. In the ablation zone covered by bare ice in summer, most of the surface melt energy is provided by absorbed shortwave fluxes, which could be reduced by solar geoengineering measures. However, so far very little is known about the potential impacts of an artificial reduction in the incoming solar radiation on the GrIS surface energy budget and the subsequent change in meltwater production. By forcing the regional climate model MAR with the latest CMIP6 shared socioeconomic pathways (SSP) future emission scenarios (SSP245, SSP585) and associated G6solar experiment from the CNRM-ESM2-1 Earth system model, we estimate the local impact of a reduced solar constant on the projected GrIS surface mass balance (SMB) decrease. Overall, our results show that even in the case of a low-mitigation greenhouse gas emissions scenario (SSP585), the Greenland surface mass loss can be brought in line with the medium-mitigation emissions scenario (SSP245) by reducing the solar downward flux at the top of the atmosphere by g1/440W/m2 or g1/41.5% (using the G6solar experiment). In addition to reducing global warming in line with SSP245, G6solar also decreases the efficiency of surface meltwater production over the Greenland ice sheet by damping the well-known positive melt-albedo feedback. With respect to a MAR simulation where the solar constant remains unchanged, decreasing the solar constant according to G6solar in the MAR radiative scheme mitigates the projected Greenland ice sheet surface melt increase by 6%. However, only more constraining geoengineering experiments than G6solar would allow us to maintain a positive SMB until the end of this century without any reduction in our greenhouse gas emissions. © 2021 Xavier Fettweis et al.
英文关键词	climate modeling; energy budget; global warming; greenhouse gas; meltwater; regional climate; solar radiation; surface energy; Arctic; Greenland; Greenland Ice Sheet
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/202304
作者单位	SPHERES Research Units, Geography Department, University of Liège, Liège, Belgium; Department of Geosciences, University of Oslo, Oslo, Norway; CNRM, Université de Toulouse, Météo-France, CNRS, Toulouse, France; Univ. Grenoble Alpes, CNRS, Institut des Géosciences de l'Environnement, Grenoble, France; Earth System Science, Departement Geografie, Vrije Universiteit Brussel, Brussels, Belgium; Earth Sciences, University College London, London, United Kingdom
推荐引用方式 GB/T 7714	Fettweis X.,Hofer S.,Séférian R.,et al. Brief communication: Reduction in the future Greenland ice sheet surface melt with the help of solar geoengineering[J],2021,15(6).
APA	Fettweis X..,Hofer S..,Séférian R..,Amory C..,Delhasse A..,...&Irvine P..(2021).Brief communication: Reduction in the future Greenland ice sheet surface melt with the help of solar geoengineering.Cryosphere,15(6).
MLA	Fettweis X.,et al."Brief communication: Reduction in the future Greenland ice sheet surface melt with the help of solar geoengineering".Cryosphere 15.6(2021).