The impact of surface melt rate and catchment characteristics on Greenland Ice Sheet moulin inputs
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 ∼...
Published in: | The Cryosphere |
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Online Access: | https://doi.org/10.5194/tc-17-2607-2023 https://tc.copernicus.org/articles/17/2607/2023/ |
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ftcopernicus:oai:publications.copernicus.org:tc106213 2023-07-30T04:03:48+02:00 The impact of surface melt rate and catchment characteristics on Greenland Ice Sheet moulin inputs Hill, Tim Dow, Christine F. 2023-07-04 application/pdf https://doi.org/10.5194/tc-17-2607-2023 https://tc.copernicus.org/articles/17/2607/2023/ eng eng doi:10.5194/tc-17-2607-2023 https://tc.copernicus.org/articles/17/2607/2023/ eISSN: 1994-0424 Text 2023 ftcopernicus https://doi.org/10.5194/tc-17-2607-2023 2023-07-10T16:24:17Z 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 × 27 km 2 <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="68pt" height="14pt" class="svg-formula" dspmath="mathimg" md5hash="d2c9ac5f006c470e314a90811e78f921"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="tc-17-2607-2023-ie00001.svg" width="68pt" height="14pt" src="tc-17-2607-2023-ie00001.png"/></svg:svg> 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. Text Greenland Ice Sheet Copernicus Publications: E-Journals Greenland The Cryosphere 17 7 2607 2624 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
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 × 27 km 2 <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="68pt" height="14pt" class="svg-formula" dspmath="mathimg" md5hash="d2c9ac5f006c470e314a90811e78f921"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="tc-17-2607-2023-ie00001.svg" width="68pt" height="14pt" src="tc-17-2607-2023-ie00001.png"/></svg:svg> 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. |
format |
Text |
author |
Hill, Tim Dow, Christine F. |
spellingShingle |
Hill, Tim Dow, Christine F. The impact of surface melt rate and catchment characteristics on Greenland Ice Sheet moulin inputs |
author_facet |
Hill, Tim Dow, Christine F. |
author_sort |
Hill, Tim |
title |
The impact of surface melt rate and catchment characteristics on Greenland Ice Sheet moulin inputs |
title_short |
The impact of surface melt rate and catchment characteristics on Greenland Ice Sheet moulin inputs |
title_full |
The impact of surface melt rate and catchment characteristics on Greenland Ice Sheet moulin inputs |
title_fullStr |
The impact of surface melt rate and catchment characteristics on Greenland Ice Sheet moulin inputs |
title_full_unstemmed |
The impact of surface melt rate and catchment characteristics on Greenland Ice Sheet moulin inputs |
title_sort |
impact of surface melt rate and catchment characteristics on greenland ice sheet moulin inputs |
publishDate |
2023 |
url |
https://doi.org/10.5194/tc-17-2607-2023 https://tc.copernicus.org/articles/17/2607/2023/ |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_source |
eISSN: 1994-0424 |
op_relation |
doi:10.5194/tc-17-2607-2023 https://tc.copernicus.org/articles/17/2607/2023/ |
op_doi |
https://doi.org/10.5194/tc-17-2607-2023 |
container_title |
The Cryosphere |
container_volume |
17 |
container_issue |
7 |
container_start_page |
2607 |
op_container_end_page |
2624 |
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1772814894362525696 |