EGU24-5136, updated on 08 Mar 2024
EGU General Assembly 2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

PRODEM: An annual series of summer DEMs (2019-2023) for the marginal areas of the Greenland Ice Sheet

Mai Winstrup1, Heidi Ranndal1, Signe H. Larsen2, Sebastian B. Simonsen1, Kenneth D. Mankoff2,3,4, Robert S. Fausto2, and Louise S. Sørensen1
Mai Winstrup et al.
  • 1Technical University of Denmark, DTU Space, Copenhagen, Denmark (
  • 2Geological Survey of Denmark and Greenland (GEUS), Copenhagen, Denmark
  • 3Autonomic Integra LLC, New York, USA
  • 4NASA Goddard Institute for Space Studies, New York, USA

Surface topography within the marginal zone of the Greenland Ice Sheet continually evolves in response to varying weather, season, climate and ice dynamics. However, existing ice sheet Digital Elevation Models (DEMs) usually rely on multi-year data, obscuring these changes over time. We have here developed an annual series (2019-2023) of summer DEMs in 500m resolution for the Greenland ice sheet marginal zone, referred to as PRODEMs. Encompassing all outlet glaciers from the Greenland ice sheet, these PRODEMs result from fusing CryoSat-2 radar altimetry and ICESat-2 laser altimetry using a regionally-varying Kriging method. Validated through leave-one-out cross-validation, they demonstrate accurate representation of surface elevations within the spatially varying prediction uncertainties with a median value of 1.4m.

The PRODEMs capture the recent annual evolution in summer surface topography of all outlet glaciers from the Greenland ice sheet. We observe a general lowering of surface elevations compared to ArcticDEM, but the spatial pattern of change is highly complex and with annual changes superimposed. The PRODEMs offer detailed insights into marginal ice sheet elevation changes, temporally as well as spatially, making them valuable for researchers and users studying ice sheet dynamics under changing environmental conditions.

How to cite: Winstrup, M., Ranndal, H., Larsen, S. H., Simonsen, S. B., Mankoff, K. D., Fausto, R. S., and Sørensen, L. S.: PRODEM: An annual series of summer DEMs (2019-2023) for the marginal areas of the Greenland Ice Sheet, EGU General Assembly 2024, Vienna, Austria, 14–19 Apr 2024, EGU24-5136,, 2024.