气候变化领域集成服务门户(CCPortal): Simple models for the simulation of submarine melt for a Greenland glacial system model

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DOI	10.5194/tc-12-301-2018
	Simple models for the simulation of submarine melt for a Greenland glacial system model
	Beckmann J.; Perrette M.; Ganopolski A.
发表日期	2018
ISSN	19940416
卷号	12 期号:1
英文摘要	Two hundred marine-terminating Greenland outlet glaciers deliver more than half of the annually accumulated ice into the ocean and have played an important role in the Greenland ice sheet mass loss observed since the mid-1990s. Submarine melt may play a crucial role in the mass balance and position of the grounding line of these outlet glaciers. As the ocean warms, it is expected that submarine melt will increase, potentially driving outlet glaciers retreat and contributing to sea level rise. Projections of the future contribution of outlet glaciers to sea level rise are hampered by the necessity to use models with extremely high resolution of the order of a few hundred meters. That requirement in not only demanded when modeling outlet glaciers as a stand alone model but also when coupling them with high-resolution 3-D ocean models. In addition, fjord bathymetry data are mostly missing or inaccurate (errors of several hundreds of meters), which questions the benefit of using computationally expensive 3-D models for future predictions. Here we propose an alternative approach built on the use of a computationally efficient simple model of submarine melt based on turbulent plume theory. We show that such a simple model is in reasonable agreement with several available modeling studies. We performed a suite of experiments to analyze sensitivity of these simple models to model parameters and climate characteristics. We found that the computationally cheap plume model demonstrates qualitatively similar behavior as 3-D general circulation models. To match results of the 3-D models in a quantitative manner, a scaling factor of the order of 1 is needed for the plume models. We applied this approach to model submarine melt for six representative Greenland glaciers and found that the application of a line plume can produce submarine melt compatible with observational data. Our results show that the line plume model is more appropriate than the cone plume model for simulating the average submarine melting of real glaciers in Greenland. © 2018 Author(s). This work is distributed under the Creative Commons Attribution 3.0 License.
学科领域	general circulation model; glacier; glacier mass balance; glacier retreat; grounding line; ice core; ice sheet; numerical model; plume; sea level change; simulation; underwater environment; Arctic; Greenland; Greenland Ice Sheet
语种	英语
scopus关键词	general circulation model; glacier; glacier mass balance; glacier retreat; grounding line; ice core; ice sheet; numerical model; plume; sea level change; simulation; underwater environment; Arctic; Greenland; Greenland Ice Sheet
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/119249
作者单位	Earth System Analysis - Research Domain 1, Potsdam Institute for Climate Impact Research, Potsdam, 14412, Germany
推荐引用方式 GB/T 7714	Beckmann J.,Perrette M.,Ganopolski A.. Simple models for the simulation of submarine melt for a Greenland glacial system model[J],2018,12(1).
APA	Beckmann J.,Perrette M.,&Ganopolski A..(2018).Simple models for the simulation of submarine melt for a Greenland glacial system model.Cryosphere,12(1).
MLA	Beckmann J.,et al."Simple models for the simulation of submarine melt for a Greenland glacial system model".Cryosphere 12.1(2018).