Intercomparison of surface meltwater routing models for the Greenland ice sheet and influence on subglacial effective pressures
Each summer, large volumes of surface meltwater drain off the Greenland ice sheet (GrIS) surface through moulins to the bed, impacting subglacial hydrology and ice flow dynamics. Supraglacial surface routing delays may propagate to englacial and subglacial hydrologic systems, requiring accurate asse...
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Copernicus Publications
2020
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00054217 2023-05-15T16:27:33+02:00 Intercomparison of surface meltwater routing models for the Greenland ice sheet and influence on subglacial effective pressures Yang, Kang Sommers, Aleah Andrews, Lauren C. Smith, Laurence C. Lu, Xin Fettweis, Xavier Li, Manchun 2020-10 electronic https://doi.org/10.5194/tc-14-3349-2020 https://noa.gwlb.de/receive/cop_mods_00054217 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00053868/tc-14-3349-2020.pdf https://tc.copernicus.org/articles/14/3349/2020/tc-14-3349-2020.pdf eng eng Copernicus Publications The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-14-3349-2020 https://noa.gwlb.de/receive/cop_mods_00054217 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00053868/tc-14-3349-2020.pdf https://tc.copernicus.org/articles/14/3349/2020/tc-14-3349-2020.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2020 ftnonlinearchiv https://doi.org/10.5194/tc-14-3349-2020 2022-02-08T22:35:08Z Each summer, large volumes of surface meltwater drain off the Greenland ice sheet (GrIS) surface through moulins to the bed, impacting subglacial hydrology and ice flow dynamics. Supraglacial surface routing delays may propagate to englacial and subglacial hydrologic systems, requiring accurate assessment to correctly estimate subglacial effective pressures. We compare hourly supraglacial moulin discharge simulations from three surface meltwater routing models – the synthetic unit hydrograph (SUH), the bare-ice component of surface routing and lake filling (SRLF), and the rescaled width function (RWF) – for four internally drained catchments on the southwestern Greenland ice sheet surface. The routing models are forced identically using surface runoff from the Modèle Atmosphérique Régionale regional climate model (RCM). For each catchment, simulated moulin hydrographs are input to the SHAKTI subglacial hydrologic model to simulate diurnally varying subglacial effective-pressure variations in the vicinity of a single moulin. Overall, all three routing models produce more realistic moulin discharges than simply using RCM runoff outputs without surface routing but produce significant differences in peak moulin discharge and time to peak. In particular, the RWF yields later, smaller peak moulin discharges than the SUH or SRLF due to its representation of slow interfluve flow between supraglacial meltwater channels, and it can readily accommodate the seasonal evolution of supraglacial stream and river networks. Differences among the three routing models are reflected in a series of simple idealized subglacial hydrology simulations that yield different diurnal effective-pressure amplitudes; however, the supraglacial hydrologic system acts as short-term storage for surface meltwater, and the temporal mean effective pressure is relatively consistent across routing models. Article in Journal/Newspaper Greenland Ice Sheet The Cryosphere Niedersächsisches Online-Archiv NOA Greenland The Cryosphere 14 10 3349 3365 |
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English |
topic |
article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Yang, Kang Sommers, Aleah Andrews, Lauren C. Smith, Laurence C. Lu, Xin Fettweis, Xavier Li, Manchun Intercomparison of surface meltwater routing models for the Greenland ice sheet and influence on subglacial effective pressures |
topic_facet |
article Verlagsveröffentlichung |
description |
Each summer, large volumes of surface meltwater drain off the Greenland ice sheet (GrIS) surface through moulins to the bed, impacting subglacial hydrology and ice flow dynamics. Supraglacial surface routing delays may propagate to englacial and subglacial hydrologic systems, requiring accurate assessment to correctly estimate subglacial effective pressures. We compare hourly supraglacial moulin discharge simulations from three surface meltwater routing models – the synthetic unit hydrograph (SUH), the bare-ice component of surface routing and lake filling (SRLF), and the rescaled width function (RWF) – for four internally drained catchments on the southwestern Greenland ice sheet surface. The routing models are forced identically using surface runoff from the Modèle Atmosphérique Régionale regional climate model (RCM). For each catchment, simulated moulin hydrographs are input to the SHAKTI subglacial hydrologic model to simulate diurnally varying subglacial effective-pressure variations in the vicinity of a single moulin. Overall, all three routing models produce more realistic moulin discharges than simply using RCM runoff outputs without surface routing but produce significant differences in peak moulin discharge and time to peak. In particular, the RWF yields later, smaller peak moulin discharges than the SUH or SRLF due to its representation of slow interfluve flow between supraglacial meltwater channels, and it can readily accommodate the seasonal evolution of supraglacial stream and river networks. Differences among the three routing models are reflected in a series of simple idealized subglacial hydrology simulations that yield different diurnal effective-pressure amplitudes; however, the supraglacial hydrologic system acts as short-term storage for surface meltwater, and the temporal mean effective pressure is relatively consistent across routing models. |
format |
Article in Journal/Newspaper |
author |
Yang, Kang Sommers, Aleah Andrews, Lauren C. Smith, Laurence C. Lu, Xin Fettweis, Xavier Li, Manchun |
author_facet |
Yang, Kang Sommers, Aleah Andrews, Lauren C. Smith, Laurence C. Lu, Xin Fettweis, Xavier Li, Manchun |
author_sort |
Yang, Kang |
title |
Intercomparison of surface meltwater routing models for the Greenland ice sheet and influence on subglacial effective pressures |
title_short |
Intercomparison of surface meltwater routing models for the Greenland ice sheet and influence on subglacial effective pressures |
title_full |
Intercomparison of surface meltwater routing models for the Greenland ice sheet and influence on subglacial effective pressures |
title_fullStr |
Intercomparison of surface meltwater routing models for the Greenland ice sheet and influence on subglacial effective pressures |
title_full_unstemmed |
Intercomparison of surface meltwater routing models for the Greenland ice sheet and influence on subglacial effective pressures |
title_sort |
intercomparison of surface meltwater routing models for the greenland ice sheet and influence on subglacial effective pressures |
publisher |
Copernicus Publications |
publishDate |
2020 |
url |
https://doi.org/10.5194/tc-14-3349-2020 https://noa.gwlb.de/receive/cop_mods_00054217 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00053868/tc-14-3349-2020.pdf https://tc.copernicus.org/articles/14/3349/2020/tc-14-3349-2020.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet The Cryosphere |
genre_facet |
Greenland Ice Sheet The Cryosphere |
op_relation |
The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-14-3349-2020 https://noa.gwlb.de/receive/cop_mods_00054217 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00053868/tc-14-3349-2020.pdf https://tc.copernicus.org/articles/14/3349/2020/tc-14-3349-2020.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/tc-14-3349-2020 |
container_title |
The Cryosphere |
container_volume |
14 |
container_issue |
10 |
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3349 |
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3365 |
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1766016958834147328 |