Mass balance and freshwater contribution of the Greenland ice sheet: a combined modelling and observational approach
The outlet glaciers of Greenland can drain large volumes of solid ice, via calving of iceberg and bottom melting from floating ice tongues. The contribution of these solid-ice fluxes is controlled by ice dynamics, such that it had been generally believed to have a relatively slow response to climate...
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ftzenodo:oai:zenodo.org:7529528 2023-05-15T16:21:00+02:00 Mass balance and freshwater contribution of the Greenland ice sheet: a combined modelling and observational approach Babiker, Mohamed Miles, Martin Johannessen, Ola M. Sandven, Stein 2008-01-15 https://zenodo.org/record/7529528 https://doi.org/10.5281/zenodo.7529528 eng eng doi:10.5281/zenodo.7529527 https://zenodo.org/communities/nersc-research https://zenodo.org/record/7529528 https://doi.org/10.5281/zenodo.7529528 oai:zenodo.org:7529528 info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/4.0/legalcode Greenland Glacier Outlet glacier Satellite image Synthetic Aperture Radar ERS ENVISAT Calving front Ice flux Velocity Mass discharge info:eu-repo/semantics/report publication-report 2008 ftzenodo https://doi.org/10.5281/zenodo.752952810.5281/zenodo.7529527 2023-03-11T00:16:32Z The outlet glaciers of Greenland can drain large volumes of solid ice, via calving of iceberg and bottom melting from floating ice tongues. The contribution of these solid-ice fluxes is controlled by ice dynamics, such that it had been generally believed to have a relatively slow response to climate forcing or changes in boundary conditions. However, this assumption has recently been questioned and observations of one surging glaciers in Greenland suggest relatively large and rapid changes in flux are possible. The magnitude of solid ice entering the ocean can be determined ideally by deriving the ice flux crossing line of calving glaciers, using remote-sensing data and ancillary data. Here, our research goal here is to identify the spatial-temporal variability and possible trends in indicators of calving fluxes for the Petermann glacier in northern Greenland, which is relatively unknown. The methodology approach is based primarily on analysis of repetitive satellite data over a period starting from 1990, together with sporadic earlier observations. Different satellite image data has been acquired and explored to estimate the interannual to decadal mean and variability of frontal position and ice-surface velocity (indicators of solid ice fluxes). The multi-sensor data range from high-resolution optical images from declassified satellite data, Landsat, SPOT and TerraASTER and high-resolution SAR images from ERS and ENVISAT. The SAR data are useful to readily delineate the calving front, regardless of cloud cover. The SAR data include ERS- 1/-2, and ASAR ENVISAT. These disparate data have been imported, geo-registered and analysed within a Geographic Information System. Two analysis methods have been used: 1) Delineating the calving front of the glacier and 2) Estimating the surface velocity using sequential satellite images. We have found from our decadal+ series of image measurements, the surface velocity of the Petermann glacier, below the grounding line is around 800 m per year in early 1990s and slightly ... Report glacier Greenland Ice Sheet Petermann glacier Zenodo Greenland Asar ENVELOPE(134.033,134.033,68.667,68.667) |
institution |
Open Polar |
collection |
Zenodo |
op_collection_id |
ftzenodo |
language |
English |
topic |
Greenland Glacier Outlet glacier Satellite image Synthetic Aperture Radar ERS ENVISAT Calving front Ice flux Velocity Mass discharge |
spellingShingle |
Greenland Glacier Outlet glacier Satellite image Synthetic Aperture Radar ERS ENVISAT Calving front Ice flux Velocity Mass discharge Babiker, Mohamed Miles, Martin Johannessen, Ola M. Sandven, Stein Mass balance and freshwater contribution of the Greenland ice sheet: a combined modelling and observational approach |
topic_facet |
Greenland Glacier Outlet glacier Satellite image Synthetic Aperture Radar ERS ENVISAT Calving front Ice flux Velocity Mass discharge |
description |
The outlet glaciers of Greenland can drain large volumes of solid ice, via calving of iceberg and bottom melting from floating ice tongues. The contribution of these solid-ice fluxes is controlled by ice dynamics, such that it had been generally believed to have a relatively slow response to climate forcing or changes in boundary conditions. However, this assumption has recently been questioned and observations of one surging glaciers in Greenland suggest relatively large and rapid changes in flux are possible. The magnitude of solid ice entering the ocean can be determined ideally by deriving the ice flux crossing line of calving glaciers, using remote-sensing data and ancillary data. Here, our research goal here is to identify the spatial-temporal variability and possible trends in indicators of calving fluxes for the Petermann glacier in northern Greenland, which is relatively unknown. The methodology approach is based primarily on analysis of repetitive satellite data over a period starting from 1990, together with sporadic earlier observations. Different satellite image data has been acquired and explored to estimate the interannual to decadal mean and variability of frontal position and ice-surface velocity (indicators of solid ice fluxes). The multi-sensor data range from high-resolution optical images from declassified satellite data, Landsat, SPOT and TerraASTER and high-resolution SAR images from ERS and ENVISAT. The SAR data are useful to readily delineate the calving front, regardless of cloud cover. The SAR data include ERS- 1/-2, and ASAR ENVISAT. These disparate data have been imported, geo-registered and analysed within a Geographic Information System. Two analysis methods have been used: 1) Delineating the calving front of the glacier and 2) Estimating the surface velocity using sequential satellite images. We have found from our decadal+ series of image measurements, the surface velocity of the Petermann glacier, below the grounding line is around 800 m per year in early 1990s and slightly ... |
format |
Report |
author |
Babiker, Mohamed Miles, Martin Johannessen, Ola M. Sandven, Stein |
author_facet |
Babiker, Mohamed Miles, Martin Johannessen, Ola M. Sandven, Stein |
author_sort |
Babiker, Mohamed |
title |
Mass balance and freshwater contribution of the Greenland ice sheet: a combined modelling and observational approach |
title_short |
Mass balance and freshwater contribution of the Greenland ice sheet: a combined modelling and observational approach |
title_full |
Mass balance and freshwater contribution of the Greenland ice sheet: a combined modelling and observational approach |
title_fullStr |
Mass balance and freshwater contribution of the Greenland ice sheet: a combined modelling and observational approach |
title_full_unstemmed |
Mass balance and freshwater contribution of the Greenland ice sheet: a combined modelling and observational approach |
title_sort |
mass balance and freshwater contribution of the greenland ice sheet: a combined modelling and observational approach |
publishDate |
2008 |
url |
https://zenodo.org/record/7529528 https://doi.org/10.5281/zenodo.7529528 |
long_lat |
ENVELOPE(134.033,134.033,68.667,68.667) |
geographic |
Greenland Asar |
geographic_facet |
Greenland Asar |
genre |
glacier Greenland Ice Sheet Petermann glacier |
genre_facet |
glacier Greenland Ice Sheet Petermann glacier |
op_relation |
doi:10.5281/zenodo.7529527 https://zenodo.org/communities/nersc-research https://zenodo.org/record/7529528 https://doi.org/10.5281/zenodo.7529528 oai:zenodo.org:7529528 |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/4.0/legalcode |
op_doi |
https://doi.org/10.5281/zenodo.752952810.5281/zenodo.7529527 |
_version_ |
1766009015152672768 |