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Dataset

 

ESA Greenland Ice Sheet Climate Change Initiative (Greenland_Ice_Sheet_cci): Greenland Surface Elevation Change grid from SARAL-AltiKa for 2013-2017, v0.1

Update Frequency: Not Planned
Status: Completed
Online Status: ONLINE
Publication State: Published
Publication Date: 2018-11-22
Download Stats: last 12 months

Abstract

This data set is part of the ESA Greenland Ice sheet CCI project. The data set provides surface elevation changes (SEC) for the Greenland Ice sheet derived from SARAL-AltiKa for 2013-2017.

This new experimental product of surface elevation change is based on data from the AltiKa-instrument onboard the France (CNES)/Indian (ISRO) SARAL satellite. The AktiKa altimeter utilizes Ka-band radar signals, which have less penetration in the upper snow. However, the surface slope and roughness has an imprint in the derived signal and the new product is only available for the flatter central parts of the Greenland ice sheet.

The corresponding SEC grid from Cryosat-2 is included for comparison. The algorithm used to devive the product is described in the paper “Implications of changing scattering properties on the Greenland ice sheet volume change from Cryosat-2 altimetry” by S.B. Simonsen and L.S. Sørensen, Remote Sensing of the Environment, 190,pp.207-216, doi:10.1016/j.rse.2016.12.012. The approach used here corresponds to Least Squares Method (LSM) 5 described in the paper, in which the slope within each grid cell is accounted for by subtraction of the GIMP DEM; the data are corrected for both backscatter and leading edge width; and the LSM is solved at 1 km grid resolution (2 km search radius) and averaged in the post-processing to 5 km grid resolution and with a correlation length of 20 km.

Citable as:  ESA Greenland Ice Sheet CCI project team (2018): ESA Greenland Ice Sheet Climate Change Initiative (Greenland_Ice_Sheet_cci): Greenland Surface Elevation Change grid from SARAL-AltiKa for 2013-2017, v0.1. Centre for Environmental Data Analysis, date of citation. https://catalogue.ceda.ac.uk/uuid/0470e96f2d8245549ef2ba81842cdfd8
Abbreviation: Not defined
Keywords: Greenland Ice Sheet, ESA, CCI

Details

Previous Info:
No news update for this record
Previously used record identifiers:
No related previous identifiers.
Access rules:
Public data: access to these data is available to both registered and non-registered users.
Use of these data is covered by the following licence: http://licences.ceda.ac.uk/image/data_access_condition/esacci_icesheets_greenland_terms_and_conditions.pdf. When using these data you must cite them correctly using the citation given on the CEDA Data Catalogue record.
Data lineage:

Data were processed by the ESA CCI Greenland Ice Sheet project team and supplied to CEDA in the context of the ESA CCI Open Data Portal Project.

Data Quality:
As provided by the CCI Greenland Ice Sheets team
File Format:
Version 0.1 of the product contains three files: 1) NetCDF file containing the surface elevation change grids from AltiKa and from Cryosat-2 (for comparison) for 2013-2017 and their associated errors 2) PNG plot of the surface elevation change from AltiKa 3) PNG plot of the surface elevation change from Cryosat-2

Process overview

This dataset was generated by a combination of instruments deployed on platforms and computations as detailed below.

Instrument/Platform pairings

AltiKa Deployed on: SARAL (Satellite with ARGOS and AltiKa)

Computation Element: 1

Title ESA CCI Greenland Ice Sheet Surface Elevation Change from SARAL-Altika
Abstract This new experimental product of surface elevation change is based on data from the AltiKa-instrument onboard the France (CNES)/Indian (ISRO) SARAL satellite (Verron et al. 2015). The AktiKa altimeter utilizes Ka-band radar signals, which have less penetration in the upper snow. However, the surface slope and roughness has an imprint in the derived signal and the new product is only available for the flatter central parts of the Greenland ice sheet.
Input Description None
Output Description None
Software Reference None
Output Description None
  • long_name: Average time for time slice
  • var_id: t
  • names: Time, Average time for time slice
  • units: meters
  • long_name: Cartesian x-coordinate - easting
  • standard_name: projection_x_coordinate
  • var_id: x
  • names: projection_x_coordinate, Cartesian x-coordinate - easting
  • units: meters
  • long_name: Cartesian y-coordinate - northing
  • standard_name: projection_y_coordinate
  • var_id: y
  • names: projection_y_coordinate, Cartesian y-coordinate - northing
  • long_name: End of time slice
  • var_id: end_time
  • names: Time, End of time slice
  • long_name: Error estimates associated with surface elevation changes
  • var_id: SEC_error
  • names: Error estimates associated with surface elevation changes
  • var_id: landtype
  • long_name: Land type definition.
  • names: Land type definition.
  • var_id: lat
  • long_name: Latitude
  • units: degrees north
  • names: Latitude
  • var_id: start_time
  • long_name: Start of time slice
  • names: Time, Start of time slice
  • long_name: Surface elevation changes, 10.0 km gaussian filter
  • var_id: SEC
  • names: Surface elevation changes, 10.0 km gaussian filter
  • long_name: Surface elevation changes, 20.0 km gaussian filter
  • var_id: SEC
  • names: Surface elevation changes, 20.0 km gaussian filter
  • var_id: grid_projection
  • var_id: lon
  • units: degrees east
  • long_name: longitude
  • names: longitude

Co-ordinate Variables

Coverage
Temporal Range
Start time:
2013-03-31T23:00:00
End time:
2017-03-31T22:59:59
Geographic Extent

 
90.0000°
 
-80.0000°
 
-10.0000°
 
60.0000°