Model:GSM

GSM

Also known as
Model type	Single
Model part of larger framework
Note on status model
Date note status model

Incorporated models or components:

Spatial dimensions	3D
Spatial extent	Continental
Model domain	Cryosphere
One-line model description	The glacial systems model (GSM)
Extended model description	The GSM is a 3D glacial systems model that simulates ice sheet evolution over glacial-cycle timescales using a hybrid shallow-shelf/shallow-ice dynamical core with full thermo-mechanical coupling, resolved on a horizontal grid plus vertical layers for ice velocity and temperature. It uniquely integrates this ice dynamics with a wide range of bidirectionally coupled processes, including glacial isostatic adjustment, subglacial sediment transport, basal hydrology, surface drainage/lakes, and an internal energy-balance climate model, all under large-ensemble parametric uncertainty quantification.

Keywords:	Ice sheet modeling, Glacial isostatic adjustment, Paleoclimate ensemble modeling,

Name	Lev Tarasov
Type of contact	Model developer
Institute / Organization	Memorial University of Newfoundland and Labrador
Postal address 1
Postal address 2
Town / City	St. John's
Postal code	A1B 3X7
State
Country	Canada
Email address	lev@mun.ca
Phone
Fax

Supported platforms	Unix, Linux
Other platform
Programming language	Fortran90
Other program language
Code optimized	Single Processor
Multiple processors implemented
Nr of distributed processors
Nr of shared processors
Start year development	1997
Does model development still take place?	Yes
If above answer is no, provide end year model development
Code development status	Active
When did you indicate the 'code development status'?	2026
Model availability	As code
Source code availability (Or provide future intension)	Through web repository
Source web address	https://doi.org/10.5281/zenodo.17364330
Source csdms web address
Program license type	GPL v3
Program license type other
Memory requirements	--
Typical run time	--

Describe input parameters	basal sliding, ice dynamics, sediment/hydrology parameters, climate-forcing ensemble parameters, and grid specification constants
Input format	ASCII
Other input format
Describe output parameters	RSL (relative sea level), Gb (basal mass balance), agd (net potential mass balance), agdC (net actual mass balance after budget conservation), cagd (potential calving), ssmagd (total potential submarine melt), iagd (margin/calving activation flag), Tb-1 (yearly mean temp of first bedthermal layer), Qb (heat flux from bed into ice/bed interface), hp (negative bed elevation), H (ice thickness), hd (surface elevation, H−hp), dhp (change in bed elevation from present-day), dhb (−dhp), Hdisp (displacement thickness), T2m (2m air temperature), Ts/Tsurf (surface temperature), Tjja0 (mean JJA sea-level temperature), u,v,w (ice velocity components), accum/saccu (surface accumulation including refrozen superimposed ice), melt/smelt (net potential melt), prc/prec (total precipitation, snow+rain), maskwater (terrestrial/marine mask), sealev (ocean geoid elevation relative to present day)
Output format	ASCII, Binary
Other output format
Pre-processing software needed?	No
Describe pre-processing software
Post-processing software needed?	Yes
Describe post-processing software	Ferret and gnuplot
Visualization software needed?	No
If above answer is yes
Other visualization software

Describe processes represented by the model	--
Describe key physical parameters and equations	--
Describe length scale and resolution constraints	--
Describe time scale and resolution constraints	--
Describe any numerical limitations and issues	--

Describe available calibration data sets
Upload calibration data sets if available:
Describe available test data sets
Upload test data sets if available:
Describe ideal data for testing

Do you have current or future plans for collaborating with other researchers?

Is there a manual available?	No
Upload manual if available:
Model website if any	https://www.physics.mun.ca/~lev/software.html
Model forum / discussion board

Comments

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Model info

Authors

Lev Tarasov

Source code

DOI

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Featured reference(s)	Open Access Status	Year	Type of Reference	Cited
Tarasov, Lev; Lecavalier, Benoit S.; Hank, Kevin; Pollard, David; 2025. The glacial systems model (GSM) Version 25G. Geoscientific Model Development, 189565–9603. 10.5194/gmd-18-9565-2025	cc-by · publishedVersion	2025	a module overview describing a module	3