Inferred basal friction and surface mass balance of the Northeast Greenland Ice Stream using data assimilation of ICESat (Ice Cloud and land Elevation Satellite) surface altimetry and ISSM (Ice Sheet System Model)
We present a new data assimilation method within the Ice Sheet System Model (ISSM) framework that is capable of assimilating surface altimetry data from missions such as ICESat (Ice Cloud and land Elevation Satellite) into reconstructions of transient ice flow. The new method relies on algorithmic d...
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Language: | English |
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ftdoajarticles:oai:doaj.org/article:3b2ed0442600404ca5d90bec090bc7af 2023-05-15T16:28:16+02:00 Inferred basal friction and surface mass balance of the Northeast Greenland Ice Stream using data assimilation of ICESat (Ice Cloud and land Elevation Satellite) surface altimetry and ISSM (Ice Sheet System Model) E. Larour J. Utke B. Csatho A. Schenk H. Seroussi M. Morlighem E. Rignot N. Schlegel A. Khazendar 2014-12-01T00:00:00Z https://doi.org/10.5194/tc-8-2335-2014 https://doaj.org/article/3b2ed0442600404ca5d90bec090bc7af EN eng Copernicus Publications http://www.the-cryosphere.net/8/2335/2014/tc-8-2335-2014.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 1994-0416 1994-0424 doi:10.5194/tc-8-2335-2014 https://doaj.org/article/3b2ed0442600404ca5d90bec090bc7af The Cryosphere, Vol 8, Iss 6, Pp 2335-2351 (2014) Environmental sciences GE1-350 Geology QE1-996.5 article 2014 ftdoajarticles https://doi.org/10.5194/tc-8-2335-2014 2022-12-31T02:27:03Z We present a new data assimilation method within the Ice Sheet System Model (ISSM) framework that is capable of assimilating surface altimetry data from missions such as ICESat (Ice Cloud and land Elevation Satellite) into reconstructions of transient ice flow. The new method relies on algorithmic differentiation to compute gradients of objective functions with respect to model forcings. It is applied to the Northeast Greenland Ice Stream, where surface mass balance and basal friction forcings are temporally inverted, resulting in adjusted modeled surface heights that best fit existing altimetry. This new approach allows for a better quantification of basal and surface processes and a better understanding of the physical processes currently missing in transient ice-flow models to better capture the important intra- and interannual variability in surface altimetry. It also demonstrates that large spatial and temporal variability is required in model forcings such as surface mass balance and basal friction, variability that can only be explained by including more complex processes such as snowpack compaction at the surface and basal hydrology at the bottom of the ice sheet. This approach is indeed a first step towards assimilating the wealth of high spatial resolution altimetry data available from EnviSat, ICESat, Operation IceBridge and CryoSat-2, and that which will be available in the near future with the launch of ICESat-2. Article in Journal/Newspaper Greenland Ice Sheet The Cryosphere Directory of Open Access Journals: DOAJ Articles Greenland The Cryosphere 8 6 2335 2351 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental sciences GE1-350 Geology QE1-996.5 |
spellingShingle |
Environmental sciences GE1-350 Geology QE1-996.5 E. Larour J. Utke B. Csatho A. Schenk H. Seroussi M. Morlighem E. Rignot N. Schlegel A. Khazendar Inferred basal friction and surface mass balance of the Northeast Greenland Ice Stream using data assimilation of ICESat (Ice Cloud and land Elevation Satellite) surface altimetry and ISSM (Ice Sheet System Model) |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
description |
We present a new data assimilation method within the Ice Sheet System Model (ISSM) framework that is capable of assimilating surface altimetry data from missions such as ICESat (Ice Cloud and land Elevation Satellite) into reconstructions of transient ice flow. The new method relies on algorithmic differentiation to compute gradients of objective functions with respect to model forcings. It is applied to the Northeast Greenland Ice Stream, where surface mass balance and basal friction forcings are temporally inverted, resulting in adjusted modeled surface heights that best fit existing altimetry. This new approach allows for a better quantification of basal and surface processes and a better understanding of the physical processes currently missing in transient ice-flow models to better capture the important intra- and interannual variability in surface altimetry. It also demonstrates that large spatial and temporal variability is required in model forcings such as surface mass balance and basal friction, variability that can only be explained by including more complex processes such as snowpack compaction at the surface and basal hydrology at the bottom of the ice sheet. This approach is indeed a first step towards assimilating the wealth of high spatial resolution altimetry data available from EnviSat, ICESat, Operation IceBridge and CryoSat-2, and that which will be available in the near future with the launch of ICESat-2. |
format |
Article in Journal/Newspaper |
author |
E. Larour J. Utke B. Csatho A. Schenk H. Seroussi M. Morlighem E. Rignot N. Schlegel A. Khazendar |
author_facet |
E. Larour J. Utke B. Csatho A. Schenk H. Seroussi M. Morlighem E. Rignot N. Schlegel A. Khazendar |
author_sort |
E. Larour |
title |
Inferred basal friction and surface mass balance of the Northeast Greenland Ice Stream using data assimilation of ICESat (Ice Cloud and land Elevation Satellite) surface altimetry and ISSM (Ice Sheet System Model) |
title_short |
Inferred basal friction and surface mass balance of the Northeast Greenland Ice Stream using data assimilation of ICESat (Ice Cloud and land Elevation Satellite) surface altimetry and ISSM (Ice Sheet System Model) |
title_full |
Inferred basal friction and surface mass balance of the Northeast Greenland Ice Stream using data assimilation of ICESat (Ice Cloud and land Elevation Satellite) surface altimetry and ISSM (Ice Sheet System Model) |
title_fullStr |
Inferred basal friction and surface mass balance of the Northeast Greenland Ice Stream using data assimilation of ICESat (Ice Cloud and land Elevation Satellite) surface altimetry and ISSM (Ice Sheet System Model) |
title_full_unstemmed |
Inferred basal friction and surface mass balance of the Northeast Greenland Ice Stream using data assimilation of ICESat (Ice Cloud and land Elevation Satellite) surface altimetry and ISSM (Ice Sheet System Model) |
title_sort |
inferred basal friction and surface mass balance of the northeast greenland ice stream using data assimilation of icesat (ice cloud and land elevation satellite) surface altimetry and issm (ice sheet system model) |
publisher |
Copernicus Publications |
publishDate |
2014 |
url |
https://doi.org/10.5194/tc-8-2335-2014 https://doaj.org/article/3b2ed0442600404ca5d90bec090bc7af |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet The Cryosphere |
genre_facet |
Greenland Ice Sheet The Cryosphere |
op_source |
The Cryosphere, Vol 8, Iss 6, Pp 2335-2351 (2014) |
op_relation |
http://www.the-cryosphere.net/8/2335/2014/tc-8-2335-2014.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 1994-0416 1994-0424 doi:10.5194/tc-8-2335-2014 https://doaj.org/article/3b2ed0442600404ca5d90bec090bc7af |
op_doi |
https://doi.org/10.5194/tc-8-2335-2014 |
container_title |
The Cryosphere |
container_volume |
8 |
container_issue |
6 |
container_start_page |
2335 |
op_container_end_page |
2351 |
_version_ |
1766017904590979072 |