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Title: 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:
ORCiD logo [1];  [2];  [3];  [4];  [2];  [5];  [6]; ORCiD logo [7]; ORCiD logo [8];  [9];  [10];  [11]
  1. Univ. of Bergen and Bjerknes Centre for Climate Research, Bergen (Norway)
  2. ETH Zurich (Switzerland)
  3. Potsdam Institute for Climate Impact Research, Potsdam (Germany); Helmholtz Centre for Polar and Marine Research, Bremerhaven (Germany)
  4. Univ. of Alaska, Fairbanks, AK (United States)
  5. Univ. of Waterloo (Canada)
  6. Univ. of Montana, Missoula, MT (United States)
  7. Univ. of Grenoble (France)
  8. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  9. Univ. of Maine, Orono, ME (United States)
  10. ETH Zurich (Switzerland); Hokkaido Univ., Sapporo (Japan)
  11. Univ. of Colorado, Boulder, CO (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (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. 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, and Sommers, Aleah N. Wed . "SHMIP The subglacial hydrology model intercomparison Project". United States. doi: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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