The impact of surface melt rate and catchment characteristics on Greenland Ice Sheet moulin inputs

IF 4.4 2区 地球科学 Q1 GEOGRAPHY, PHYSICAL Cryosphere Pub Date : 2023-07-04 DOI:10.5194/tc-17-2607-2023
T. Hill, C. Dow
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Abstract

Abstract. The supraglacial drainage system of the Greenland Ice Sheet, in combination with surface melt rate, controls the rate of water flow into moulins, a major driver of subglacial water pressure. We apply the Subaerial Drainage System (SaDS) model, a physically based surface meltwater flow model, to a ∼20×27km2 catchment on the southwestern Greenland Ice Sheet for 4 years of melt forcing (2011, 2012, 2015, and 2016) to (1) examine the relationship between surface melt rate and the rate, diurnal amplitude, and timing of surface inputs to moulins; (2) compare SaDS to contemporary models; and (3) present a framework for selecting appropriate supraglacial drainage models for different modelling objectives. We find that variations in the rate and timing of modelled moulin inputs related to the development of supraglacial channels are relatively more important in years with low melt volumes than years with high melt volumes. We suggest that a process-resolving supraglacial hydrology model (e.g., SaDS) should be considered when modelling outcomes are sensitive to subdiurnal and long-term seasonal changes in the rate of discharge into moulins.
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地表融化速率和集水区特征对格陵兰冰盖冰窝输入的影响
摘要格陵兰冰盖的冰上排水系统与地表融化速度结合,控制着流入冰穴的水流速度,这是冰下水压的主要驱动因素。我们将地面排水系统(SaDS)模型(一种基于物理的地表融水流量模型)应用于格陵兰西南冰盖上的~ 20×27km2集水区,研究了4年(2011年、2012年、2015年和2016年)的融水强迫,以:(1)研究地表融水速率与地表注入冰碛的速率、日振幅和时间之间的关系;(2)将SaDS与当代模型进行比较;(3)提出了针对不同建模目标选择合适的冰川上排水模型的框架。我们发现,与冰上通道发育相关的模拟冰窝输入速率和时间的变化,在低融体体积的年份比高融体体积的年份相对更重要。我们建议,当模拟结果对进入冰碛的排放率的次日和长期季节性变化敏感时,应考虑过程解析的冰川上水文模型(例如SaDS)。
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来源期刊
Cryosphere
Cryosphere GEOGRAPHY, PHYSICAL-GEOSCIENCES, MULTIDISCIPLINARY
CiteScore
8.70
自引率
17.30%
发文量
240
审稿时长
4-8 weeks
期刊介绍: The Cryosphere (TC) is a not-for-profit international scientific journal dedicated to the publication and discussion of research articles, short communications, and review papers on all aspects of frozen water and ground on Earth and on other planetary bodies. The main subject areas are the following: ice sheets and glaciers; planetary ice bodies; permafrost and seasonally frozen ground; seasonal snow cover; sea ice; river and lake ice; remote sensing, numerical modelling, in situ and laboratory studies of the above and including studies of the interaction of the cryosphere with the rest of the climate system.
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