Generating synthetic fjord bathymetry for coastal Greenland
Bed topography is a critical boundary for the numerical modelling of ice sheets and ice–ocean interactions. A persistent issue with existing topography products for the bed of the Greenland Ice Sheet and surrounding sea floor is the poor representation of coastal bathymetry, especially in regions of...
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Copernicus Publications
2017
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fttriple:oai:gotriple.eu:oai:doaj.org/article:971ef6a25ba54b13a861926949e3cae3 2023-05-15T16:26:17+02:00 Generating synthetic fjord bathymetry for coastal Greenland C. N. Williams S. L. Cornford T. M. Jordan J. A. Dowdeswell M. J. Siegert C. D. Clark D. A. Swift A. Sole I. Fenty J. L. Bamber 2017-02-01 https://doi.org/10.5194/tc-11-363-2017 http://www.the-cryosphere.net/11/363/2017/tc-11-363-2017.pdf https://doaj.org/article/971ef6a25ba54b13a861926949e3cae3 en eng Copernicus Publications 1994-0416 1994-0424 doi:10.5194/tc-11-363-2017 http://www.the-cryosphere.net/11/363/2017/tc-11-363-2017.pdf https://doaj.org/article/971ef6a25ba54b13a861926949e3cae3 undefined The Cryosphere, Vol 11, Iss 1, Pp 363-380 (2017) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2017 fttriple https://doi.org/10.5194/tc-11-363-2017 2023-01-22T17:50:58Z Bed topography is a critical boundary for the numerical modelling of ice sheets and ice–ocean interactions. A persistent issue with existing topography products for the bed of the Greenland Ice Sheet and surrounding sea floor is the poor representation of coastal bathymetry, especially in regions of floating ice and near the grounding line. Sparse data coverage, and the resultant coarse resolution at the ice–ocean boundary, poses issues in our ability to model ice flow advance and retreat from the present position. In addition, as fjord bathymetry is known to exert strong control on ocean circulation and ice–ocean forcing, the lack of bed data leads to an inability to model these processes adequately. Since the release of the last complete Greenland bed topography–bathymetry product, new observational bathymetry data have become available. These data can be used to constrain bathymetry, but many fjords remain completely unsampled and therefore poorly resolved. Here, as part of the development of the next generation of Greenland bed topography products, we present a new method for constraining the bathymetry of fjord systems in regions where data coverage is sparse. For these cases, we generate synthetic fjord geometries using a method conditioned by surveys of terrestrial glacial valleys as well as existing sinuous feature interpolation schemes. Our approach enables the capture of the general bathymetry profile of a fjord in north-west Greenland close to Cape York, when compared to observational data. We validate our synthetic approach by demonstrating reduced overestimation of depths compared to past attempts to constrain fjord bathymetry. We also present an analysis of the spectral characteristics of fjord centrelines using recently acquired bathymetric observations, demonstrating how a stochastic model of fjord bathymetry could be parameterised and used to create different realisations. Article in Journal/Newspaper Greenland Ice Sheet The Cryosphere Unknown Cape York ENVELOPE(-87.000,-87.000,73.801,73.801) Greenland The Cryosphere 11 1 363 380 |
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language |
English |
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geo envir |
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geo envir C. N. Williams S. L. Cornford T. M. Jordan J. A. Dowdeswell M. J. Siegert C. D. Clark D. A. Swift A. Sole I. Fenty J. L. Bamber Generating synthetic fjord bathymetry for coastal Greenland |
topic_facet |
geo envir |
description |
Bed topography is a critical boundary for the numerical modelling of ice sheets and ice–ocean interactions. A persistent issue with existing topography products for the bed of the Greenland Ice Sheet and surrounding sea floor is the poor representation of coastal bathymetry, especially in regions of floating ice and near the grounding line. Sparse data coverage, and the resultant coarse resolution at the ice–ocean boundary, poses issues in our ability to model ice flow advance and retreat from the present position. In addition, as fjord bathymetry is known to exert strong control on ocean circulation and ice–ocean forcing, the lack of bed data leads to an inability to model these processes adequately. Since the release of the last complete Greenland bed topography–bathymetry product, new observational bathymetry data have become available. These data can be used to constrain bathymetry, but many fjords remain completely unsampled and therefore poorly resolved. Here, as part of the development of the next generation of Greenland bed topography products, we present a new method for constraining the bathymetry of fjord systems in regions where data coverage is sparse. For these cases, we generate synthetic fjord geometries using a method conditioned by surveys of terrestrial glacial valleys as well as existing sinuous feature interpolation schemes. Our approach enables the capture of the general bathymetry profile of a fjord in north-west Greenland close to Cape York, when compared to observational data. We validate our synthetic approach by demonstrating reduced overestimation of depths compared to past attempts to constrain fjord bathymetry. We also present an analysis of the spectral characteristics of fjord centrelines using recently acquired bathymetric observations, demonstrating how a stochastic model of fjord bathymetry could be parameterised and used to create different realisations. |
format |
Article in Journal/Newspaper |
author |
C. N. Williams S. L. Cornford T. M. Jordan J. A. Dowdeswell M. J. Siegert C. D. Clark D. A. Swift A. Sole I. Fenty J. L. Bamber |
author_facet |
C. N. Williams S. L. Cornford T. M. Jordan J. A. Dowdeswell M. J. Siegert C. D. Clark D. A. Swift A. Sole I. Fenty J. L. Bamber |
author_sort |
C. N. Williams |
title |
Generating synthetic fjord bathymetry for coastal Greenland |
title_short |
Generating synthetic fjord bathymetry for coastal Greenland |
title_full |
Generating synthetic fjord bathymetry for coastal Greenland |
title_fullStr |
Generating synthetic fjord bathymetry for coastal Greenland |
title_full_unstemmed |
Generating synthetic fjord bathymetry for coastal Greenland |
title_sort |
generating synthetic fjord bathymetry for coastal greenland |
publisher |
Copernicus Publications |
publishDate |
2017 |
url |
https://doi.org/10.5194/tc-11-363-2017 http://www.the-cryosphere.net/11/363/2017/tc-11-363-2017.pdf https://doaj.org/article/971ef6a25ba54b13a861926949e3cae3 |
long_lat |
ENVELOPE(-87.000,-87.000,73.801,73.801) |
geographic |
Cape York Greenland |
geographic_facet |
Cape York Greenland |
genre |
Greenland Ice Sheet The Cryosphere |
genre_facet |
Greenland Ice Sheet The Cryosphere |
op_source |
The Cryosphere, Vol 11, Iss 1, Pp 363-380 (2017) |
op_relation |
1994-0416 1994-0424 doi:10.5194/tc-11-363-2017 http://www.the-cryosphere.net/11/363/2017/tc-11-363-2017.pdf https://doaj.org/article/971ef6a25ba54b13a861926949e3cae3 |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/tc-11-363-2017 |
container_title |
The Cryosphere |
container_volume |
11 |
container_issue |
1 |
container_start_page |
363 |
op_container_end_page |
380 |
_version_ |
1766015185583079424 |