A global, high-resolution data set of ice sheet topography, cavity geometry, and ocean bathymetry
The ocean plays an important role in modulating the mass balance of the polar ice sheets by interacting with the ice shelves in Antarctica and with the marine-terminating outlet glaciers in Greenland. Given that the flux of warm water onto the continental shelf and into the sub-ice cavities is steer...
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ftcopernicus:oai:publications.copernicus.org:essd49406 2023-05-15T13:15:54+02:00 A global, high-resolution data set of ice sheet topography, cavity geometry, and ocean bathymetry Schaffer, Janin Timmermann, Ralph Arndt, Jan Erik Kristensen, Steen Savstrup Mayer, Christoph Morlighem, Mathieu Steinhage, Daniel 2018-09-27 application/pdf https://doi.org/10.5194/essd-8-543-2016 https://essd.copernicus.org/articles/8/543/2016/ eng eng doi:10.5194/essd-8-543-2016 https://essd.copernicus.org/articles/8/543/2016/ eISSN: 1866-3516 Text 2018 ftcopernicus https://doi.org/10.5194/essd-8-543-2016 2020-07-20T16:23:56Z The ocean plays an important role in modulating the mass balance of the polar ice sheets by interacting with the ice shelves in Antarctica and with the marine-terminating outlet glaciers in Greenland. Given that the flux of warm water onto the continental shelf and into the sub-ice cavities is steered by complex bathymetry, a detailed topography data set is an essential ingredient for models that address ice–ocean interaction. We followed the spirit of the global RTopo-1 data set and compiled consistent maps of global ocean bathymetry, upper and lower ice surface topographies, and global surface height on a spherical grid with now 30 arcsec grid spacing. For this new data set, called RTopo-2, we used the General Bathymetric Chart of the Oceans (GEBCO_2014) as the backbone and added the International Bathymetric Chart of the Arctic Ocean version 3 (IBCAOv3) and the International Bathymetric Chart of the Southern Ocean (IBCSO) version 1. While RTopo-1 primarily aimed at a good and consistent representation of the Antarctic ice sheet, ice shelves, and sub-ice cavities, RTopo-2 now also contains ice topographies of the Greenland ice sheet and outlet glaciers. In particular, we aimed at a good representation of the fjord and shelf bathymetry surrounding the Greenland continent. We modified data from earlier gridded products in the areas of Petermann Glacier, Hagen Bræ, and Sermilik Fjord, assuming that sub-ice and fjord bathymetries roughly follow plausible Last Glacial Maximum ice flow patterns. For the continental shelf off Northeast Greenland and the floating ice tongue of Nioghalvfjerdsfjorden Glacier at about 79° N, we incorporated a high-resolution digital bathymetry model considering original multibeam survey data for the region. Radar data for surface topographies of the floating ice tongues of Nioghalvfjerdsfjorden Glacier and Zachariæ Isstrøm have been obtained from the data centres of Technical University of Denmark (DTU), Operation Icebridge (NASA/NSF), and Alfred Wegener Institute (AWI). For the Antarctic ice sheet/ice shelves, RTopo-2 largely relies on the Bedmap-2 product but applies corrections for the geometry of Getz, Abbot, and Fimbul ice shelf cavities. The data set is available in full and in regional subsets in NetCDF format from the PANGAEA database at doi:10.1594/PANGAEA.856844 . Text Alfred Wegener Institute Antarc* Antarctic Antarctica Arctic Arctic Ocean Fimbul Ice Shelf glacier Greenland Ice Sheet Ice Shelf Ice Shelves Nioghalvfjerdsfjorden Petermann glacier Sermilik Southern Ocean Copernicus Publications: E-Journals Antarctic Arctic Arctic Ocean Fimbul Ice Shelf ENVELOPE(-0.500,-0.500,-70.750,-70.750) Getz ENVELOPE(-145.217,-145.217,-76.550,-76.550) Greenland Hagen ENVELOPE(6.545,6.545,62.545,62.545) Nioghalvfjerdsfjorden ENVELOPE(-21.500,-21.500,79.500,79.500) Southern Ocean The Antarctic Earth System Science Data 8 2 543 557 |
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Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
The ocean plays an important role in modulating the mass balance of the polar ice sheets by interacting with the ice shelves in Antarctica and with the marine-terminating outlet glaciers in Greenland. Given that the flux of warm water onto the continental shelf and into the sub-ice cavities is steered by complex bathymetry, a detailed topography data set is an essential ingredient for models that address ice–ocean interaction. We followed the spirit of the global RTopo-1 data set and compiled consistent maps of global ocean bathymetry, upper and lower ice surface topographies, and global surface height on a spherical grid with now 30 arcsec grid spacing. For this new data set, called RTopo-2, we used the General Bathymetric Chart of the Oceans (GEBCO_2014) as the backbone and added the International Bathymetric Chart of the Arctic Ocean version 3 (IBCAOv3) and the International Bathymetric Chart of the Southern Ocean (IBCSO) version 1. While RTopo-1 primarily aimed at a good and consistent representation of the Antarctic ice sheet, ice shelves, and sub-ice cavities, RTopo-2 now also contains ice topographies of the Greenland ice sheet and outlet glaciers. In particular, we aimed at a good representation of the fjord and shelf bathymetry surrounding the Greenland continent. We modified data from earlier gridded products in the areas of Petermann Glacier, Hagen Bræ, and Sermilik Fjord, assuming that sub-ice and fjord bathymetries roughly follow plausible Last Glacial Maximum ice flow patterns. For the continental shelf off Northeast Greenland and the floating ice tongue of Nioghalvfjerdsfjorden Glacier at about 79° N, we incorporated a high-resolution digital bathymetry model considering original multibeam survey data for the region. Radar data for surface topographies of the floating ice tongues of Nioghalvfjerdsfjorden Glacier and Zachariæ Isstrøm have been obtained from the data centres of Technical University of Denmark (DTU), Operation Icebridge (NASA/NSF), and Alfred Wegener Institute (AWI). For the Antarctic ice sheet/ice shelves, RTopo-2 largely relies on the Bedmap-2 product but applies corrections for the geometry of Getz, Abbot, and Fimbul ice shelf cavities. The data set is available in full and in regional subsets in NetCDF format from the PANGAEA database at doi:10.1594/PANGAEA.856844 . |
format |
Text |
author |
Schaffer, Janin Timmermann, Ralph Arndt, Jan Erik Kristensen, Steen Savstrup Mayer, Christoph Morlighem, Mathieu Steinhage, Daniel |
spellingShingle |
Schaffer, Janin Timmermann, Ralph Arndt, Jan Erik Kristensen, Steen Savstrup Mayer, Christoph Morlighem, Mathieu Steinhage, Daniel A global, high-resolution data set of ice sheet topography, cavity geometry, and ocean bathymetry |
author_facet |
Schaffer, Janin Timmermann, Ralph Arndt, Jan Erik Kristensen, Steen Savstrup Mayer, Christoph Morlighem, Mathieu Steinhage, Daniel |
author_sort |
Schaffer, Janin |
title |
A global, high-resolution data set of ice sheet topography, cavity geometry, and ocean bathymetry |
title_short |
A global, high-resolution data set of ice sheet topography, cavity geometry, and ocean bathymetry |
title_full |
A global, high-resolution data set of ice sheet topography, cavity geometry, and ocean bathymetry |
title_fullStr |
A global, high-resolution data set of ice sheet topography, cavity geometry, and ocean bathymetry |
title_full_unstemmed |
A global, high-resolution data set of ice sheet topography, cavity geometry, and ocean bathymetry |
title_sort |
global, high-resolution data set of ice sheet topography, cavity geometry, and ocean bathymetry |
publishDate |
2018 |
url |
https://doi.org/10.5194/essd-8-543-2016 https://essd.copernicus.org/articles/8/543/2016/ |
long_lat |
ENVELOPE(-0.500,-0.500,-70.750,-70.750) ENVELOPE(-145.217,-145.217,-76.550,-76.550) ENVELOPE(6.545,6.545,62.545,62.545) ENVELOPE(-21.500,-21.500,79.500,79.500) |
geographic |
Antarctic Arctic Arctic Ocean Fimbul Ice Shelf Getz Greenland Hagen Nioghalvfjerdsfjorden Southern Ocean The Antarctic |
geographic_facet |
Antarctic Arctic Arctic Ocean Fimbul Ice Shelf Getz Greenland Hagen Nioghalvfjerdsfjorden Southern Ocean The Antarctic |
genre |
Alfred Wegener Institute Antarc* Antarctic Antarctica Arctic Arctic Ocean Fimbul Ice Shelf glacier Greenland Ice Sheet Ice Shelf Ice Shelves Nioghalvfjerdsfjorden Petermann glacier Sermilik Southern Ocean |
genre_facet |
Alfred Wegener Institute Antarc* Antarctic Antarctica Arctic Arctic Ocean Fimbul Ice Shelf glacier Greenland Ice Sheet Ice Shelf Ice Shelves Nioghalvfjerdsfjorden Petermann glacier Sermilik Southern Ocean |
op_source |
eISSN: 1866-3516 |
op_relation |
doi:10.5194/essd-8-543-2016 https://essd.copernicus.org/articles/8/543/2016/ |
op_doi |
https://doi.org/10.5194/essd-8-543-2016 |
container_title |
Earth System Science Data |
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8 |
container_issue |
2 |
container_start_page |
543 |
op_container_end_page |
557 |
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1766271732466843648 |