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Greenland Ice Sheet Essential Climate Variable

ICESat elevation changes 2003-2009 L. Sorensen, DTU-Space Over the last decade, the Greenland Ice Sheet has shown rapid change, characterized by rapid thinning along the margins, accelerating outlet glaciers, and overall increasing mass loss. The state of the Greenland Ice Sheet is of global importance, and has consequently been included in the CCI Programme as a monitored Essential Climate Variable (ECV).

The object of the CCI Ice Sheets project is to maximize the impact of ESA satellite data on climate research, by analysing data from ESA Earth Observation missions such as ERS, Envisat, CryoSat, GRACE and the new Sentinel series of satellites.

The project will produce data products of the following five parameters, which are important in characterizing the Greenland Ice Sheet as an ECV:

Surface Elevation Change (SEC) gridded data from radar altimetry; 
Ice Velocity (IV) gridded data from synthetic aperture radar interferometry and feature tracking;
Calving Front Location (CFL) time series of marine-terminating glaciers;
Grounding Line Location (GLL) time series of marine-terminating glaciers;
Gravimetry Mass Balance (GMB) maps and time series.

The CCI data will be supplemented with partner agency data from missions such as Landsat and ICESat in order to provide consistent, long term time series of these five parameters. Together with melt extent data from satellite microwave observations, the CCI Greenland Ice Sheet data sets will improve the monitoring of the most rapidly changing ice sheet on the planet. 

All data will be made available to the public in a transparent format. We believe that the data sets produced van be of great societal importance, particularly due to the connection between Ice Sheets changes and future global sea level changes.

Figure: ICESat elevation changes 2003-2009 (L. Sørensen, DTU-Space). For a large version of the figure click "read more": Read more »

Release of added GMB data product from TU Dresden

The GIS_cci is happy to announce the release of an added GMB data product - produced by TU Dresden.

Progress Meeting and Co-location at ESRIN October 3 to 6 2016

2016-10-03 09:00
2016-10-06 17:00

The GIS_cci project will run a Progress Meeting on Monday October 3 and then participate with a solid delegation at the Co-location meeting in ESRIN October 4 to 6 2016.

Newsletter Issue 6

The Greenland_Ice_Sheet_cci project is happy to announce the release of Newsletter Issue 6.  This issue provides commentary and images of the newly released data products for the GIS_cci ECV parameters Surface Elevation Change, Ice Velocity, Grounding Line Location, and the new phase two parameter Gravimetry Mass Balance. A presentation is also given of the ongoing Optical Ice Velocity processing including a comparison with with our existiting SAR-based Ice Velocity product in the Jakobshavn Glacier area.

Gravimetry Mass Balance: In phase two of the GIS_cci project, the following products are provided: basin-wide time series of mass changes obtained from the GRACE (Gravity Recovery and Climate Experiment) satellite mission for the period 2002 – present, and a time series for the entire Greenland Ice Sheet. In addition, users can find five-year running means of mass changes for nine time periods from 2003 until 2015 (to aid in comparison with exiting 5-year running means of SEC). Read more »

New Data Products available

The Greenland_Ice_Sheet_cci project has released new Greenland Data Products. The new products are:

Surface Elevation Change based CryoSat-2 (2-year and 4-year means); 
Ice Velocity Greenland-wide map based on Sentinel-1 data (2014-2016) and RADARSAT-2 data (2013-2014), and 9 major ice streams updated with Sentinel-1 data; 
Gravimetric Mass Balance based on GRACE (2002-present), both for Greenland as a whole and for 8 main drainage basins; and 
Calving Front Locations and Grounding Line Locations updated data for Greenland Glaciers.

Brief instructions for downloading the Data Products:

  • Click on the Data Products under the Direct Link  heading on your left side or go directly to the data product websiste;
  • Detailed instructions on registration and maneuvering within the data products websiste are found in the ”Product User Guide”; Click on the Product User Guide under the Direct Link heading located just below the Data Products link.

New released Greenland_Ice_Sheet_cci data products on SEC and IV

The Greenland_Ice_Sheet_cci project has released new Greenland-wide ice velocity data (2014-15, from the ESA Sentinel-1 mission), as well as new composite elevation change data from the period 1992-2014 from the ESA ERS-1,-2, Envisat and Cryosat-2 missions. The new data are an addition to existing Greenland CCI data on coastal and basin velocity (1995-2011), as well as calving front locations (1992-2011) and grounding lines (1995-96) for a number of Greenland glaciers.

The data sets are provided as part of the European Space Agency Climate Change Initiative, Data providers for the CCI data include DTU-Space and GEUS (Denmark), ENVEO (Austria), Nansen Centre for Environmental Research and S&T (Norway). Data can be downloaded, along with requested citations for use of data, at Read more »

Updated Data Products on SEC and IV from Phase 1 are shortly available - while Phase 2 is progressing

We are happy to announce that Phase 1 is being closed; the formal documents are approved and the updated Data Products on the SEC and IV parameters are beeing prepared for uploading and user access the coming days. The Greenland_Ice_Sheet_cci project Phase 2 is progressing well.

The first milestone (kick-off plus six months) has just passed. We are closing in on Progress Meeting no 2 in Copenhagen Nov 11th to 13th - a meeting to be held in conjunction with the Antarctica_Ice_Sheet_cci project. Read more »

Invitation to Round Robin for the Gravimetric Mass Balance (GMB) parameter

The Greenland_Ice_Sheet_cci project performs an open round robin experiment to compare and evaluate algorithms for the generation of Gravimetric Mass Balance (GMB) products. Since the experiment is carried out in close collaboration with the Antarctic_Ice_Sheet_cci project it deals with both the Antarctic Ice Sheet and the Greenland Ice Sheet. Beside GRACE data synthetic datasets of global mass changes form the basis for the algorithm evaluation. 

The Greenland_Ice_Sheet_cci team is looking forward to receive your contribution by 30th of September 2015 (extended deadline). All contributions will be analysed anonymously.

For instructions please see Read more »

Data Products Visualisation Available

ESTECA visualisation of the Greenland_Ice_Sheets_cci data products has been made in Google Earth and is available for download. In the visualisation, Surface Elevation Change (SEC) data and Ice Velocity (IV) data are shown as partly transparent overlays. Calving Front Location (CFL) data is show as polygons. The user may navigate and zoom using the relatively familiar Google Earth interface. The Google Earth program must be installed to view the file.

The temporal span of the data is controlled by using the time interval picker in the top left corner. The CFL data for various epochs may be inspected by setting the temporal span. The same may be done for the 5-year running means in SEC. For IV, the PALSAR partial coverage and the Jakobshavn and Upernavik focus areas comprise multiple snapshots in time.   Read more »

Data Products Available!

The Greenland_Ice_Sheet_cci data products are available from the Products Download Page. Important information about the data products is available in the Product User Guide (PUG). Please review the PUG when checking out the data products.

Fill in the simplified registration form by clicking on ’register’, then enter the following information about yourself: Your name in the following form: Firstname.Lastname, your organisation, and your email address. Choose your password and click ‘Register’. Click ‘log in’ and provide (again) your name on the form Firstname.Lastname, and the password you previously picked.

The SEC, IV, CFL and GLL products are now available and may now be downloaded from the page. Read more »

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