Preprints
https://doi.org/10.5194/essd-2023-224
https://doi.org/10.5194/essd-2023-224
12 Jul 2023
 | 12 Jul 2023
Status: this preprint is currently under review for the journal ESSD.

PRODEM: Annual summer DEMs (2019–present) of the marginal areas of the Greenland Ice Sheet

Mai Winstrup, Heidi Ranndal, Signe Hillerup Larsen, Sebastian Bjerregaard Simonsen, Kenneth David Mankoff, Robert Schjøtt Fausto, and Louise Sandberg Sørensen

Abstract. Surface topography across the marginal zone of the Greenland Ice Sheet is constantly evolving in response to changes in weather, season, climate and ice dynamics. Yet current Digital Elevation Models (DEMs) for the ice sheet are usually based on data from a multi-year period, thus obscuring these changes over time. We here present four 500-meter resolution annual (2019–2022) summer DEMs of the Greenland ice sheet marginal zone (PRODEMs). The PRODEMs cover a 50 km wide band from the ice edge, and they capture all outlet glaciers of the Greenland ice sheet. Each PRODEM is based on data fusion of CryoSat-2 radar altimetry and ICESat-2 laser altimetry using a regionally-varying Kriging method. They are validated using leave-one-out cross-validation, showcasing their ability to correctly represent surface elevations within the associated spatially varying prediction uncertainties, which have a median value of 1.4 m. 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 will enable studies of the marginal ice sheet elevation changes in great detail, temporally as well as spatially. With their high spatio-temporal resolution, the PRODEMs will be of value to a wide range of researchers and users studying ice sheet dynamics and monitoring how the ice sheet responds to changing environmental conditions. Incorporating the PRODEM surface elevations in estimates of the solid ice discharge from Greenland outlet glaciers will e.g. improve our assessment of the mass balance of the Greenland ice sheet and its interannual variability. PRODEMs from summers 2019 through 2022 are available at https://doi.org/10.22008/FK2/52WWHG (Winstrup, 2023), and we plan to annually update the product henceforth.

Mai Winstrup et al.

Status: open (until 04 Nov 2023)

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  • RC1: 'Comment on essd-2023-224', Romain Hugonnet, 16 Sep 2023 reply

Mai Winstrup et al.

Data sets

PRODEM: Annual summer DEMs of the marginal areas of the Greenland Ice Sheet Mai Winstrup https://doi.org/10.22008/FK2/52WWHG

Mai Winstrup et al.

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Short summary
Surface topography across the marginal zone of the Greenland Ice Sheet is constantly evolving. We here present four 500-meter resolution annual (2019–2022) summer DEMs (PRODEMs) of the Greenland ice sheet marginal zone, capturing all outlet glaciers of the ice sheet. The PRODEMs are based on fusion of CryoSat-2 radar altimetry and ICESat-2 laser altimetry. With their high spatial and temporal resolution, the PRODEMs will enable detailed studies of the changes in marginal ice sheet elevations.