ESA ice sheet CCI: derivation of the optimal method for surface elevation change detection of the Greenland ice sheet – round robin results

Levinsen, Joanna Fredenslund; Khvorostovsky, K.; Ticconi, Francesca; Shepherd, A.; Forsberg, R.; Sørensen, Louise Sandberg; Muir, Alan; Pie, Nadège; Felikson, Denis; Flament, Thomas; Hurkmans, R. T. W. L.; Moholdt, Geir; Gunter, B. C.; Lindenbergh, Roderik; Kleinherenbrink, Marcel

doi:10.1080/01431161.2014.999385

Cited by 12 publications

(14 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Aside from the SPIRIT DEM, the 30 m GIMP (Greenland Ice Mapping Project) DEM is also widely used at present [ Howat et al ., ; Levinsen et al ., ; Lindbäck et al ., ; Smith et al ., ]. The GIMP DEM is a hybrid product of the SPIRIT DEM and ASTER DEM for the ablation zone of the GrIS, vertically registered to ICESat and Airborne Topographic Mapper laser altimetry.…”

Section: Methodsmentioning

confidence: 99%

Internally drained catchments dominate supraglacial hydrology of the southwest Greenland Ice Sheet

Yang

Smith

2016

J. Geophys. Res. Earth Surf.

144

View full text Add to dashboard Cite

Internally drained catchments (IDCs) are hydrologic units on the Greenland Ice Sheet (GrIS) surface that collect and drain meltwater through supraglacial stream/river networks to terminal moulins or lakes. Their areas and shapes constrain the volumes and locations of supraglacial meltwater penetration into the ice. We map IDCs of the southwest GrIS by using Landsat‐8 Operational Land Imager panchromatic imagery and a moderate‐resolution digital elevation model (DEM). In total 919 IDCs are mapped between 400 m and 2000 m above sea level, together with their associated supraglacial river networks (total length of 21,129 km), supraglacial lakes (436), and terminal moulins (872). A complex yet broadly predictable surface drainage pattern is revealed, with both IDC areas (AIDC, averaging 17.0 ± 22.8 km2, range of 0.4–244.9 km2) and the optimal DEM depression‐filling threshold (Adep, varying from 0.2 to 1.0 km2) generally increasing with ice surface elevation H. Historical air photos suggest possible transferability of the first relationship over space and time. Intersection of IDC boundaries with Modèle Atmosphérique Régional regional climate model runoff simulations shows >50% of runoff modeled for elevations >1600 m is not transported downstream to lower elevations, but instead drains to a small number (51 out of 872) of terminal moulins, indicating modest but nontrivial penetration of surface meltwater at high elevations. In sum, IDCs provide a new, fine‐scale hydrologic unit for study of GrIS surface hydrologic processes.

show abstract

Section: Methodsmentioning

confidence: 99%

Internally drained catchments dominate supraglacial hydrology of the southwest Greenland Ice Sheet

Yang

Smith

2016

J. Geophys. Res. Earth Surf.

144

View full text Add to dashboard Cite

show abstract

“…Elevation accuracy and / uncertainty is much higher for the topographically complex ablation zone due to their large spatial measurement footprint and wide orbital track spacing, with slope errors >20 m for slopes >1 o and systematic biases over rough surfaces [39,95,109,132]. Careful processing has been used to discriminate ablation zone thinning rates using ERS-1/2 and EnviSat altimetry data, including repeattrack analysis, but the accuracy of these data and their process-based interpretation is ambiguous owing to the aforementioned slope errors and sparse spatial measurement density in the ablation zone [118,[133][134][135].…”

Section: Radar Altimetry Sensors and Datasetsmentioning

confidence: 99%

“…Careful processing has been used to discriminate ablation zone thinning rates using ERS-1/2 and EnviSat altimetry data, including repeat-track analysis, but the accuracy of these data and their process-based interpretation is ambiguous Remote Sens. 2019, 11, 2405 7 of 50 owing to the aforementioned slope errors and sparse spatial measurement density in the ablation zone [118,[133][134][135].…”

Section: Radar Altimetry Sensors and Datasetsmentioning

confidence: 99%

Satellite Remote Sensing of the Greenland Ice Sheet Ablation Zone: A Review

Cooper

Smith

2019

Remote Sensing

View full text Add to dashboard Cite

The Greenland Ice Sheet is now the largest land ice contributor to global sea level rise, largely driven by increased surface meltwater runoff from the ablation zone, i.e., areas of the ice sheet where annual mass losses exceed gains. This small but critically important area of the ice sheet has expanded in size by~50% since the early 1960s, and satellite remote sensing is a powerful tool for monitoring the physical processes that influence its surface mass balance. This review synthesizes key remote sensing methods and scientific findings from satellite remote sensing of the Greenland Ice Sheet ablation zone, covering progress in (1) radar altimetry, (2) laser (lidar) altimetry, (3) gravimetry, (4) multispectral optical imagery, and (5) microwave and thermal imagery. Physical characteristics and quantities examined include surface elevation change, gravimetric mass balance, reflectance, albedo, and mapping of surface melt extent and glaciological facies and zones. The review concludes that future progress will benefit most from methods that combine multi-sensor, multi-wavelength, and cross-platform datasets designed to discriminate the widely varying surface processes in the ablation zone. Specific examples include fusing laser altimetry, radar altimetry, and optical stereophotogrammetry to enhance spatial measurement density, cross-validate surface elevation change, and diagnose radar elevation bias; employing dual-frequency radar, microwave scatterometry, or combining radar and laser altimetry to map seasonal snow depth; fusing optical imagery, radar imagery, and microwave scatterometry to discriminate between snow, liquid water, refrozen meltwater, and bare ice near the equilibrium line altitude; combining optical reflectance with laser altimetry to map supraglacial lake, stream, and crevasse bathymetry; and monitoring the inland migration of snowlines, surface melt extent, and supraglacial hydrologic features.

show abstract

“…At present, several projects and/or data centres are working to provide these synergistic datasets; a difficult task due to the need for inter-sensor calibrations, the different kinds of sensors used, and the different resolution and accuracy of historical data (e.g. http://nsidc.org and Levinson et al (2015)). …”

Section: Future Sea Ice Research and Monitoringmentioning

confidence: 99%

Progress in satellite remote sensing for studying physical processes at the ocean surface and its borders with the atmosphere and sea ice

Shutler

Quartly

Donlon³

et al. 2016

Progress in Physical Geography: Earth and Environment

View full text Add to dashboard Cite

Physical oceanography is the study of physical conditions, processes and variables within the ocean, including temperature–salinity distributions, mixing of the water column, waves, tides, currents and air–sea interaction processes. Here we provide a critical review of how satellite sensors are being used to study physical oceanography processes at the ocean surface and its borders with the atmosphere and sea ice. The paper begins by describing the main sensor types that are used to observe the oceans (visible, thermal infrared and microwave) and the specific observations that each of these sensor types can provide. We then present a critical review of how these sensors and observations are being used to study: (i) ocean surface currents, (ii) storm surges, (iii) sea ice, (iv) atmosphere–ocean gas exchange and (v) surface heat fluxes via phytoplankton. Exciting advances include the use of multiple sensors in synergy to observe temporally varying Arctic sea ice volume, atmosphere–ocean gas fluxes, and the potential for four-dimensional water circulation observations. For each of these applications we explain their relevance to society, review recent advances and capability, and provide a forward look at future prospects and opportunities. We then more generally discuss future opportunities for oceanography-focused remote sensing, which includes the unique European Union Copernicus programme, the potential of the International Space Station and commercial miniature satellites. The increasing availability of global satellite remote-sensing observations means that we are now entering an exciting period for oceanography. The easy access to these high quality data and the continued development of novel platforms is likely to drive further advances in remote sensing of the ocean and atmospheric systems.

show abstract

ESA ice sheet CCI: derivation of the optimal method for surface elevation change detection of the Greenland ice sheet – round robin results

Cited by 12 publications

References 37 publications

Internally drained catchments dominate supraglacial hydrology of the southwest Greenland Ice Sheet

Internally drained catchments dominate supraglacial hydrology of the southwest Greenland Ice Sheet

Satellite Remote Sensing of the Greenland Ice Sheet Ablation Zone: A Review

Progress in satellite remote sensing for studying physical processes at the ocean surface and its borders with the atmosphere and sea ice

Contact Info

Product

Resources

About