Impacts of Differing Melt Regimes on Satellite Radar Waveforms and Elevation Retrievals
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 poo...
Main Authors: | , , |
---|---|
Format: | Text |
Language: | English |
Published: |
2024
|
Subjects: | |
Online Access: | https://doi.org/10.5194/egusphere-2024-1152 https://egusphere.copernicus.org/preprints/2024/egusphere-2024-1152/ |
id |
ftcopernicus:oai:publications.copernicus.org:egusphere119484 |
---|---|
record_format |
openpolar |
spelling |
ftcopernicus:oai:publications.copernicus.org:egusphere119484 2024-06-23T07:53:24+00:00 Impacts of Differing Melt Regimes on Satellite Radar Waveforms and Elevation Retrievals Ronan, Alexander Hawley, Robert Chipman, Jonathan 2024-05-21 application/pdf https://doi.org/10.5194/egusphere-2024-1152 https://egusphere.copernicus.org/preprints/2024/egusphere-2024-1152/ eng eng doi:10.5194/egusphere-2024-1152 https://egusphere.copernicus.org/preprints/2024/egusphere-2024-1152/ eISSN: Text 2024 ftcopernicus https://doi.org/10.5194/egusphere-2024-1152 2024-06-13T01:24:17Z 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. Text Greenland Ice Sheet Copernicus Publications: E-Journals Greenland Raven Camp ENVELOPE(-46.295,-46.295,66.493,66.493) |
institution |
Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
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. |
format |
Text |
author |
Ronan, Alexander Hawley, Robert Chipman, Jonathan |
spellingShingle |
Ronan, Alexander Hawley, Robert Chipman, Jonathan Impacts of Differing Melt Regimes on Satellite Radar Waveforms and Elevation Retrievals |
author_facet |
Ronan, Alexander Hawley, Robert Chipman, Jonathan |
author_sort |
Ronan, Alexander |
title |
Impacts of Differing Melt Regimes on Satellite Radar Waveforms and Elevation Retrievals |
title_short |
Impacts of Differing Melt Regimes on Satellite Radar Waveforms and Elevation Retrievals |
title_full |
Impacts of Differing Melt Regimes on Satellite Radar Waveforms and Elevation Retrievals |
title_fullStr |
Impacts of Differing Melt Regimes on Satellite Radar Waveforms and Elevation Retrievals |
title_full_unstemmed |
Impacts of Differing Melt Regimes on Satellite Radar Waveforms and Elevation Retrievals |
title_sort |
impacts of differing melt regimes on satellite radar waveforms and elevation retrievals |
publishDate |
2024 |
url |
https://doi.org/10.5194/egusphere-2024-1152 https://egusphere.copernicus.org/preprints/2024/egusphere-2024-1152/ |
long_lat |
ENVELOPE(-46.295,-46.295,66.493,66.493) |
geographic |
Greenland Raven Camp |
geographic_facet |
Greenland Raven Camp |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_source |
eISSN: |
op_relation |
doi:10.5194/egusphere-2024-1152 https://egusphere.copernicus.org/preprints/2024/egusphere-2024-1152/ |
op_doi |
https://doi.org/10.5194/egusphere-2024-1152 |
_version_ |
1802645014211198976 |