Preprints
https://doi.org/10.5194/egusphere-2024-1152
https://doi.org/10.5194/egusphere-2024-1152
21 May 2024
 | 21 May 2024
Status: this preprint is open for discussion.

Impacts of Differing Melt Regimes on Satellite Radar Waveforms and Elevation Retrievals

Alexander Ronan, Robert Hawley, and Jonathan Chipman

Abstract. Geodetic surface mass balance calculations rely on satellite radar altimeters such as CryoSat-2 to understand elevation and volume changes of the Greenland Ice Sheet (GrIS). However, the impact of varying GrIS shallow subsurface stratigraphic conditions on Level 2 CryoSat-2 elevation products is poorly understood. We investigate the reliability of the Offset Center of Gravity (OCOG) and University College London Land-Ice elevation (ULI) retracking algorithms through the analysis of, and comparison with, Level 1B waveform-derived Leading-Edge Width (LeW). We generate a 2010 to 2021 LeW time series using temporal clustering and Bayesian Model averaging and compare with Level 2 OCOG and ULI elevation time series. This workflow is performed at Summit Station, NEEM, and Raven Camp, chosen to represent the upper and lower bounds of the dry-snow zone, and percolation zone respectively. We note that melting event, snowpack recovery, and potentially anomalous snow accumulation and high-speed winds signatures are evident in Summit Station’s LeW time series. We find that Level 1B LeW has a significant inverse relationship with the ULI Level 2 elevations at NEEM and Summit Station, and likely the entire dry snow zone. The ULI Level 2 elevations at Raven Camp, and likely the entire percolation zone, have no clear elevation bias associated with significant melt events. The OCOG retracked elevations showed no significant association with LeW at any site. Future work is needed to understand the impacts of GrIS high-speed wind events and snow accumulation on elevation products, as well as to create retracking algorithms that are more resilient to abrupt changes in the shallow subsurface.

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Alexander Ronan, Robert Hawley, and Jonathan Chipman

Status: open (until 17 Jul 2024)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
Alexander Ronan, Robert Hawley, and Jonathan Chipman

Data sets

Impacts of Differing Melt Regimes on Satellite Radar Waveforms and Elevation Retrievals: Data & Scripts Alexander Ronan, Robert Hawley, and Jonathan Chipman https://zenodo.org/records/10969275

Model code and software

Impacts of Differing Melt Regimes on Satellite Radar Waveforms and Elevation Retrievals: Data & Scripts Alexander Ronan, Robert Hawley, and Jonathan Chipman https://zenodo.org/records/10969275

Alexander Ronan, Robert Hawley, and Jonathan Chipman

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Short summary
We generate a 2010–2021 time series of CryoSat-2 waveform shape metrics on the Greenland Ice Sheet, and compare it to CryoSat-2 elevation data, to investigate the reliability of two algorithms used to derive elevations from the SIRAL radar altimeter. Retracked elevations are found to depend on a waveform's leading-edge width in the dry snow zone. The study indicates that retracking algorithms must consider significant climate events and snow conditions when assessing elevation change.