The Cryosphere
The Cryosphere
TC
Articles | Volume 17, issue 12
Articles | Volume 17, issue 12
https://doi.org/10.5194/tc-17-5499-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/tc-17-5499-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 17, issue 12
Research article
 | 
22 Dec 2023
Research article |  | 22 Dec 2023

Impact of time-dependent data assimilation on ice flow model initialization and projections: a case study of Kjer Glacier, Greenland

Youngmin Choi, Helene Seroussi, Mathieu Morlighem, Nicole-Jeanne Schlegel, and Alex Gardner

Data sets

Data for "Impact of time-dependent data assimilation on ice flow model initialization and projections: a case study of Kjer Glacier, Greenland" Youngmin Choi, Helene Seroussi, Mathieu Morlighem, Nicole-Jeanne Schlegel, and Alex Gardner https://doi.org/10.5281/zenodo.8436908

Greenland Marine-Terminating Glacier Retreat Data M. Wood, E. Rignot, I. Fenty, et al. https://doi.org/10.7280/D1667W

IceBridge BedMachine Greenland, Version 3 M. Morlighem et al. https://doi.org/10.5067/2CIX82HUV88Y

Geothermal heat flux distribution for the Greenland ice sheet, derived by combining a global representation and information from deep ice cores, 2.00 R. Greve https://doi.org/10.17592/001.2018022701

ITS_LIVE Regional Glacier and Ice Sheet Surface Velocities A. S. Gardner, M. Fahnestock, and T. A. Scambos https://its-live.jpl.nasa.gov

Model code and software

Ice-sheet and Sea-level System Model source code, v4.23 r27919 ISSM Team https://doi.org/10.5281/zenodo.8436924

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Short summary
Ice sheet models are often initialized using snapshot observations of present-day conditions, but this approach has limitations in capturing the transient evolution of the system. To more accurately represent the accelerating changes in glaciers, we employed time-dependent data assimilation. We found that models calibrated with the transient data better capture past trends and more accurately reproduce changes after the calibration period, even with limited observations.
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