SHMIP The subglacial hydrology model intercomparison Project
Abstract
Subglacial hydrology plays a key role in many glaciological processes, including ice dynamics via the modulation of basal sliding. Owing to the lack of an overarching theory, however, a variety of model approximations exist to represent the subglacial drainage system. The Subglacial Hydrology Model Intercomparison Project (SHMIP) provides a set of synthetic experiments to compare existing and future models. We present the results from 13 participating models with a focus on effective pressure and discharge. For many applications (e.g. steady states and annual variations, low input scenarios) a simple model, such as an inefficient-system-only model, a flowline or lumped model, or a porous-layer model provides results comparable to those of more complex models. However, when studying short term (e.g. diurnal) variations of the water pressure, the use of a two-dimensional model incorporating physical representations of both efficient and inefficient drainage systems yields results that are significantly different from those of simpler models and should be preferentially applied. The results also emphasise the role of water storage in the response of water pressure to transient recharge. Finally, we find that the localisation of moulins has a limited impact except in regions of sparse moulin density.
- Authors:
-
[1];
[7];
[8];
- Univ. of Bergen and Bjerknes Centre for Climate Research, Bergen (Norway)
- ETH Zurich (Switzerland)
- Potsdam Institute for Climate Impact Research, Potsdam (Germany); Helmholtz Centre for Polar and Marine Research, Bremerhaven (Germany)
- Univ. of Alaska, Fairbanks, AK (United States)
- Univ. of Waterloo (Canada)
- Univ. of Montana, Missoula, MT (United States)
- Univ. of Grenoble (France)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Univ. of Maine, Orono, ME (United States)
- ETH Zurich (Switzerland); Hokkaido Univ., Sapporo (Japan)
- Univ. of Colorado, Boulder, CO (United States)
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE Laboratory Directed Research and Development (LDRD) Program
- OSTI Identifier:
- 1544686
- Report Number(s):
- LA-UR-18-30871
Journal ID: ISSN 0022-1430
- Grant/Contract Number:
- 89233218CNA000001
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Glaciology
- Additional Journal Information:
- Journal Volume: 64; Journal Issue: 248; Journal ID: ISSN 0022-1430
- Publisher:
- International Glaciological Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 58 GEOSCIENCES; glacier hydrology; glacier modelling; glaciological model experiments; ice-sheet modelling; subglacial processes
Citation Formats
de Fleurian, Basile, Werder, Mauro A., Beyer, Sebastian, Brinkerhoff, Douglas J., Delaney, Ian, Dow, Christine F., Downs, Jacob, Gagliardini, Olivier, Hoffman, Matthew James, Hooke, Roger LeB, Seguinot, Julien, and Sommers, Aleah N.. SHMIP The subglacial hydrology model intercomparison Project. United States: N. p., 2018.
Web. doi:10.1017/jog.2018.78.
de Fleurian, Basile, Werder, Mauro A., Beyer, Sebastian, Brinkerhoff, Douglas J., Delaney, Ian, Dow, Christine F., Downs, Jacob, Gagliardini, Olivier, Hoffman, Matthew James, Hooke, Roger LeB, Seguinot, Julien, & Sommers, Aleah N.. SHMIP The subglacial hydrology model intercomparison Project. United States. https://doi.org/10.1017/jog.2018.78
de Fleurian, Basile, Werder, Mauro A., Beyer, Sebastian, Brinkerhoff, Douglas J., Delaney, Ian, Dow, Christine F., Downs, Jacob, Gagliardini, Olivier, Hoffman, Matthew James, Hooke, Roger LeB, Seguinot, Julien, and Sommers, Aleah N.. Wed .
"SHMIP The subglacial hydrology model intercomparison Project". United States. https://doi.org/10.1017/jog.2018.78. https://www.osti.gov/servlets/purl/1544686.
@article{osti_1544686,
title = {SHMIP The subglacial hydrology model intercomparison Project},
author = {de Fleurian, Basile and Werder, Mauro A. and Beyer, Sebastian and Brinkerhoff, Douglas J. and Delaney, Ian and Dow, Christine F. and Downs, Jacob and Gagliardini, Olivier and Hoffman, Matthew James and Hooke, Roger LeB and Seguinot, Julien and Sommers, Aleah N.},
abstractNote = {Subglacial hydrology plays a key role in many glaciological processes, including ice dynamics via the modulation of basal sliding. Owing to the lack of an overarching theory, however, a variety of model approximations exist to represent the subglacial drainage system. The Subglacial Hydrology Model Intercomparison Project (SHMIP) provides a set of synthetic experiments to compare existing and future models. We present the results from 13 participating models with a focus on effective pressure and discharge. For many applications (e.g. steady states and annual variations, low input scenarios) a simple model, such as an inefficient-system-only model, a flowline or lumped model, or a porous-layer model provides results comparable to those of more complex models. However, when studying short term (e.g. diurnal) variations of the water pressure, the use of a two-dimensional model incorporating physical representations of both efficient and inefficient drainage systems yields results that are significantly different from those of simpler models and should be preferentially applied. The results also emphasise the role of water storage in the response of water pressure to transient recharge. Finally, we find that the localisation of moulins has a limited impact except in regions of sparse moulin density.},
doi = {10.1017/jog.2018.78},
journal = {Journal of Glaciology},
number = 248,
volume = 64,
place = {United States},
year = {2018},
month = {10}
}
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How accurate are estimates of glacier ice thickness? Results from ITMIX, the Ice Thickness Models Intercomparison eXperiment
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