气候变化领域集成服务门户(CCPortal): Modelling steady states and the transient response of debris-covered glaciers

CCPortal

DOI	10.5194/tc-15-3377-2021
	Modelling steady states and the transient response of debris-covered glaciers
	Ferguson J.C.; Vieli A.
发表日期	2021
ISSN	19940416
起始页码	3377
结束页码	3399
卷号	15 期号:7
英文摘要	Debris-covered glaciers are commonly found in alpine landscapes of high relief and play an increasingly important role in a warming climate. As a result of the insulating effect of supraglacial debris, their response to changes in climate is less direct and their dynamic behaviour more complex than for debris-free glaciers. Due to a lack of observations, here we use numerical modelling to explore the dynamic interactions between debris cover and geometry evolution for an idealized glacier over centennial timescales. The main goal of this study is to understand the effects of debris cover on the glacier's transient response. To do so, we use a numerical model that couples ice flow, debris transport, and its insulating effect on surface mass balance and thereby captures dynamic feedbacks that affect the volume and length evolution. In a second step we incorporate the effects of cryokarst features such as ice cliffs and supraglacial ponds on the dynamical behaviour. Our modelling indicates that thick debris cover delays both the volume response and especially the length response to a warming climate signal. Including debris dynamics therefore results in glaciers with extended debris-covered tongues and that tend to advance or stagnate in length in response to a fluctuating climate at century timescales and hence remember the cold periods more than the warm. However, when including even a relatively small amount of melt enhancing cryokarst features in the model, the length is more responsive to periods of warming and results in substantial mass loss and thinning on debris-covered tongues, as is also observed. © 2021 James C. Ferguson.
英文关键词	glacial debris; glacier dynamics; glacier mass balance; ice flow; numerical model; thermokarst; valley glacier
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/202303
作者单位	Department of Geography, University of Zurich, Zurich, Switzerland
推荐引用方式 GB/T 7714	Ferguson J.C.,Vieli A.. Modelling steady states and the transient response of debris-covered glaciers[J],2021,15(7).
APA	Ferguson J.C.,&Vieli A..(2021).Modelling steady states and the transient response of debris-covered glaciers.Cryosphere,15(7).
MLA	Ferguson J.C.,et al."Modelling steady states and the transient response of debris-covered glaciers".Cryosphere 15.7(2021).