Abstract:
We present a new compilation of multibeam-bathymetric data for the inner Amundsen Sea continental shelf beyond Thwaites and Pine Island glaciers (bounding box: 100W to 110W, 74S to 75.5S). The region includes Pine Island Bay, marine areas offshore the Thwaites Ice Shelf to the Crosson Ice Shelf, and covers an area of 74,750 km2. The bathymetric grids were compiled from all available multibeam echosounder (MBES) data acquired by UK, German, USA and Korean scientific cruises to the area between 1999 and 2019 (see lineage). Three grids of sea floor elevation data are available in a range of formats (ESRI ascii interchange format and GMT-compatible netCDF 4byte float): a 50-m resolution grid with no interpolation, a 50-m grid interpolated up to 300 m from cells with real data, and a 500-m resolution grid with no interpolation. Note that these grids have not been merged with regional bathymetric grids and, therefore, do not have continuous coverage (i.e. cells are only populated where multibeam data exist).
This work was supported by grants from the National Science Foundation (NSF: Grant OPP- 1738942) and Natural Environment Research Council (NERC: Grant NE/S006664/1) as part of the International Thwaites Glacier Collaboration (ITGC) programme, and grants NE/J005770/1 and NE/J005703/1 as part of the iSTAR Programme.
Keywords:
Coastal bathymetry, ITGC, Multibeam, Pine Island Bay, Southern Amundsen Sea Embayment, Thwaites Glacier, Thwaites Ice Shelf
Hogan, K., Larter, R., Graham, A., Nitsche, F., Kirkham, J., Totten Minzoni, R., Clark, R., Fitzgerald, V., Anderson, J., Hillenbrand, C., Simkins, L., Smith, J., Gohl, K., Arndt, J., Hong, J., Heywood, K., Abrahamsen, E., Thompson, A., Dunbar, R., & Wellner, J. (2020). A multibeam-bathymetric compilation for the southern Amundsen Sea shelf, 1999-2019 (Version 1.0) [Data set]. UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation. https://doi.org/10.5285/f2dfeda9-bf44-4ef5-89a3-ee5e434a385c
| Access Constraints: | Data from cruise NBP19-02 is under embargo until March 2021; any interest in these data should be directed to the Project Leaders (Rob Larter, BAS; Julia Wellner, Univ. of Houston). |
|---|---|
| Use Constraints: | This data is covered by a UK Open Government Licence (http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/) Further by downloading this data the user acknowledges that they agree with the NERC data policy (http://www.nerc.ac.uk/research/sites/data/policy.asp) and cite the data: Hogan, K. A., Larter, R. D., Graham, A. G. C., Nitsche, F. O., Kirkham, J. D., Totten Minzoni, R., Clark, R., Fitzgerald, V., Anderson, J. B., Hillenbrand, C.-D., Simkins, L., Smith, J. A., Gohl, K., Arndt, J. E., Hong, J., Heywood, K. J., Abrahamsen, E. P., Thompson, A. F., Dunbar, R., & Wellner, J. S. (2020). A multibeam-bathymetric compilation for the southern Amundsen Sea shelf, 1999-2019 (Version 1.0) [Data set]. UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation. https://doi.org/10.5285/F2DFEDA9-BF44-4EF5-89A3-EE5E434A385C |
| Creation Date: | 2020-07-20 |
|---|---|
| Dataset Progress: | Complete |
| Dataset Language: | English |
| ISO Topic Categories: |
|
| Parameters: |
|
| Personnel: | |
| Name | PDC BAS |
| Role(s) | Metadata Author |
| Organisation | British Antarctic Survey |
| Name | Dr Kelly Hogan |
| Role(s) | Investigator, Technical Contact |
| Organisation | British Antarctic Survey |
| Name | Dr Robert D Larter |
| Role(s) | Investigator, Technical Contact |
| Organisation | British Antarctic Survey |
| Name | Dr Alastair G C Graham |
| Role(s) | Investigator |
| Organisation | College of Marine Science, University of South Florida |
| Name | Mr James D Kirkham |
| Role(s) | Investigator |
| Organisation | British Antarctic Survey |
| Name | Dr Claus-Dieter Hillenbrand |
| Role(s) | Investigator |
| Organisation | British Antarctic Survey |
| Name | Dr James A Smith |
| Role(s) | Investigator |
| Organisation | British Antarctic Survey |
| Name | Dr Karsten Gohl |
| Role(s) | Investigator |
| Organisation | Alfred-Wegener-Institut Helmholtz-Zentrum fur Polar und Meeresforschung |
| Name | Dr Jan E Arndt |
| Role(s) | Investigator |
| Organisation | Alfred-Wegener-Institute |
| Name | Dr Jongkuk Hong |
| Role(s) | Investigator |
| Organisation | Korea Polar Research Institute, Yeonsoo-gu, South Korea |
| Name | Dr Frank O Nitsche |
| Role(s) | Investigator |
| Organisation | Lamont‐Doherty Earth Observatory, Columbia University |
| Name | Dr Rebecca Totten Minzoni |
| Role(s) | Investigator |
| Organisation | Department of Geological Sciences, University of Alabama |
| Name | Ms Rachel Clark |
| Role(s) | Investigator |
| Organisation | Departmentof Earth and Atmospheric Sciences,University of Houston |
| Name | Ms Victoria Fitzgerald |
| Role(s) | Investigator |
| Organisation | Department of Geological Sciences, University of Alabama |
| Name | Dr John B Anderson |
| Role(s) | Investigator |
| Organisation | Department of Earth Science, Rice University,Houston |
| Name | Dr Lauren Simkins |
| Role(s) | Investigator |
| Organisation | Department of Environmental Sciences, University of Virginia |
| Name | Dr Julia Wellner |
| Role(s) | Investigator |
| Organisation | Departmentof Earth and Atmospheric Sciences,University of Houston |
| Name | Prof Karen Heywood |
| Role(s) | Investigator |
| Organisation | University of East Anglia |
| Name | Dr Povl Abrahamsen |
| Role(s) | Investigator |
| Organisation | British Antarctic Survey |
| Name | Dr Andrew F Thompson |
| Role(s) | Investigator |
| Organisation | Environmental Science & Engineering, California Institute of Technology |
| Name | Dr Rob Dunbar |
| Role(s) | Investigator |
| Organisation | Stanford University |
| Parent Dataset: | N/A |
| Reference: | Main reference: Hogan, K.A., Larter, R.D., Graham, A.G.C., Arthern, R., Kirkham, J.D., Totten Minzoni, R., Jordan, T.A., Clark, R., Fitzgerald, V., Wåhlin, A.K., Anderson, J.B., Hillenbrand, C-.D., Nitsche, F.O., Simkins, L., Smith, J.A., Gohl, K., Arndt, J.E., Hong, J., Wellner, J., 2020. Revealing the former bed of Thwaites Glacier using sea-floor bathymetry: implications for warm-water routing and bed controls on ice flow and buttressing. The Cryosphere Discussions 2020, 1-36:, accepted, https://doi.org/10.5194/tc-2020-25. Related datasets: These multibeam bathymetric data have been incorporated into the two continuous regional grids listed below: i) BedMachine Antarctica Version 2 (not officially released as of July 2020) ii) Jordan, T., Porter, D., Tinto, K., Millan, R., Muto, A., Hogan, K., Larter, R., Graham, A., Paden, J., & Robinson, C. (2020). Gravity-derived bathymetry for the Thwaites, Crosson and Dotson ice shelves (2009-2019) (Version 1.0) [Data set]. UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation. https://doi.org/10.5285/7803DE8B-8A74-466B-888E-E8C737BF21CE |
|
|---|---|---|
| Quality: | Quality control was undertaken manually to remove any outliers in the source datasets. This involved cleaning of the raw data during or after each individual cruise, and then again after compiling the datasets. For cruise NBP19-02, one of the principal datasets in the grid, the raw data cleaning was done using the "mbedit" and "mbeditviz" programs from MB-system. Other BAS datasets were also cleaned using "mbedit". | |
| Lineage: | The multibeam-bathymetric grids were compiled from a variety of data sources. Multibeam echosounder (MBES) data used are from 12 scientific cruises undertaken by British Antarctic Survey (BAS), Alfred Wegener Institute (AWI), California Institute of Technology (Caltech), Stanford University, University of East Anglia, Lamont-Doherty Earth Observatory of Columbia University, the Korean Polar Research Institute (KOPRI), and Rice University. The complete list of cruises can be found as Table 1 in the reference paper (Hogan et al., 2020). MBES sounding data were cleaned during each cruise and then collated and gridded using the "mbgrid" program of MB-System. The grid was produced using the following mbgrid command parameters from MB-system version 5.6002: "-R-110/-100/-75.5/-74 -E50/50! -F1 -Jepsg3031 -A2 -C0 -V". This uses a Gaussian weighted mean filter algorithm. Additional parameter -G4 used to create ESRI-format ascii grids. Additional obvious outliers were removed from the individual sounding datasets at this stage and the data were re-gridded. This iterative process was repeated until a clean combined dataset was produced. For the interpolated 50-m grid, a small amount of interpolation was applied to fill data gaps up to 300 m away from cells with real sounding data in the "southASE_mbes_50m_interp.asc" grid using the parameter -C3/1. Here, values are interpolated up to three grid cells from the nearest data point only if additional data are found in two opposite directions. Grids are created in projection WGS84 Antarctic Polar Stereographic (epsg: 3031). The complete list of the cruises used for the compilation is described below * RRS James Clark Ross expeditions: JR179 (Larter, R.D , Hillenbrand, C-.D. , Graham, A.C.G., Smith, J.A.), JR294 (Abrahamsen, E.P., Heywood, K.A.) * RV Nathaniel B. Palmer cruises: NBP99-02 (Anderson, J.B, Wellner, J.S.), NBP07-02 (Nitsche, F.O.), NBP09-01 (Nitsche, F.O), NBP19-01 (Thompson, A., Dunbar, R.), NBP19-02 (Hogan, K.A, Larter, R.D, Graham, A.C.G, Kirkham, J.D., Totten Minzoni, R, Clark, R., Fitzgerald, V.), * RV Araon cruise: ANA02C (Hong, J.) * RV Polarstern cruises: PS104 (Gohl, K.Hillenbrand, C-.D., Larter, R.D., Arndt, J.E., Gohl, K.), ANTXXIII/4 (Hillenbrand, C-.D., Gohl, K.) , ANTXXVI/3 (Hillenbrand, C-.D., Gohl, K.) |
|
| Temporal Coverage: | |
|---|---|
| Start Date | 1999-01-01 |
| End Date | 2019-12-31 |
| Spatial Coverage: | |
| Latitude | |
| Southernmost | -75.5 |
| Northernmost | -74 |
| Longitude | |
| Westernmost | -110 |
| Easternmost | -100 |
| Altitude | |
| Min Altitude | N/A |
| Max Altitude | N/A |
| Depth | |
| Min Depth | -30.5636 |
| Max Depth | -2698.2607 |
| Data Resolution: | |
| Latitude Resolution | 50m |
| Longitude Resolution | 50m |
| Horizontal Resolution Range | 30 meters - < 100 meters |
| Vertical Resolution | N/A |
| Vertical Resolution Range | N/A |
| Temporal Resolution | N/A |
| Temporal Resolution Range | N/A |
| Location: | |
| Location | Antarctica |
| Detailed Location | Amundsen Sea Embayment |
| Location | Antarctica |
| Detailed Location | Pine Island Bay |
| Location | Antarctica |
| Detailed Location | Pine Island Ice Shelf |
| Location | Antarctica |
| Detailed Location | Canisteo Peninsula |
| Location | Antarctica |
| Detailed Location | Crosson Ice Shelf |
| Sensor(s): |
|
|---|---|
| Source(s): |
|
| Data Collection: | Please refer to the literature reference (https://doi.org/10.5194/tc-2020-25) for full details on the instrumentation and data sources of the contributing datasets. |
| Distribution: | |
|---|---|
| Distribution Media | Online Internet (HTTP) |
| Distribution Size | 542 MB |
| Distribution Format | ASCII |
| Fees | N/A |
| Data Storage: | The gridded MBES data is available as three grids (two 50-m and one 500-m resolution) with three file types of each grid (total 9 files). Formats available are: ESRI interchange (.asc); GMT-compatible netCDF (.grd) 500-m resolution: southASE_mbes_500m.asc 2.5 MB southASE_mbes_500m.grd 351 kB 50-m resolution: southASE_mbes_50m.asc 246 MB southASE_mbes_500m.grd 23.2 MB 50-m resolution (with interpolation): southASE_mbes_50m_interp.asc 247 MB southASE_mbes_50m_interp.grd 23.3 MB |