Abstract:
On cruise JR157 the Isis ROV was deployed on 15 dives in the Marguerite Trough area in January and February 2007. We present here the data acquired during dives 10 and 11. Dives 10 and 11 targeted a bedrock channel system on the inner continental shelf to investigate channel incision processes and the history of glaciation in the area. The plan was to map parts of the channel walls and thalweg, and then to use these data to locate the best coring sites within the channel system. In reality, several small patches of bathymetric data were acquired from the channels by a multibeam echosounder mounted on the ROV.
This research was funded by UK Natural Environment Research Council grant AFI06/14 (NE/C506372/1) to J.A. Dowdeswell, R.D. Larter and G. Griffiths.
Keywords:
Antarctica, Bedrock channels, Isis ROV, Marguerite Trough, Remotely-operated vehicle, bathymetry, multibeam
Dowdeswell, J., Larter, R., Noormets, R., Griffiths, G., & Hogan, K. (2021). Isis remotely-operated vehicle (ROV) bathymetry data in Marguerite Trough, Antarctica, from James Clark Ross cruise JR157, 2007 (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/ef1996e4-7825-4456-b1f7-4d1b26531d72
| Access Constraints: | None |
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| 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 the following conditions: 1. To cite the data Dowdeswell, J., Larter, R., Noormets, R., Griffiths, G., & Hogan, K. (2021). Isis remotely-operated vehicle (ROV) bathymetry data in Marguerite Trough, Antarctica, from James Clark Ross cruise JR157, 2007 (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/EF1996E4-7825-4456-B1F7-4D1B26531D72 2. The user recognizes the limitations of data and will not use this data for navigation purposes. Use of the data is at the users' own risk, and there is no warranty as to the quality or accuracy of any data, or the fitness of the data for your intended use. The data are not necessarily fully quality assured and cannot be expected to be free from measurement uncertainty, systematic biases, or errors of interpretation or analysis, and may include inaccuracies in error margins quoted with the data. NOT TO BE USED FOR NAVIGATION |
| Creation Date: | 2021-11-22 |
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| Dataset Progress: | Planned |
| Dataset Language: | English |
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| Parameters: |
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| Personnel: | |
| Name | PDC BAS |
| Role(s) | Metadata Author |
| Organisation | British Antarctic Survey |
| Name | Prof Julian Dowdeswell |
| Role(s) | Investigator |
| Organisation | Scott Polar Research Institute, University of Cambridge |
| Name | Dr Robert D Larter |
| Role(s) | Investigator |
| Organisation | British Antarctic Survey |
| Name | Dr Riko Noormets |
| Role(s) | Investigator |
| Organisation | Scott Polar Research Institute |
| Name | Prof Gwyn Griffiths |
| Role(s) | Investigator |
| Organisation | National Oceanography Centre, University of Southampton |
| Name | Dr Kelly Hogan |
| Role(s) | Investigator |
| Organisation | British Antarctic Survey |
| Parent Dataset: | N/A |
| Reference: | Dowdeswell, J.A., R. Noormets, J. Evans, G. Griffiths, R.D. Larter and C. Ó Cofaigh (2007), A comparison of swath-bathymetric imagery from high-latitude glacier-influenced fjords derived from AUV, ROV and shipboard systems. In Collins, K. and Griffiths. (eds), Collaborative Autosub Science in Extreme Environments, p. 47-54, NERC. Hogan, K.A., Arnold, N.S., Larter, R.D., Kirkham, J.D., Noormets, R., O Cofaigh, C., Golledge, N., Dowdeswell, J.A., submitted. Subglacial water floor over an Antarctic palaeo-ice stream bed. Submitted to JGR-Earth Surface in Sept. 2021. |
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| Quality: | Quality of the multibeam bathymetric data was variable with some pervasive issues relating to vehicle motion (pitch/roll artefacts) and positioning during acquisition. Position error of the ROV exceeded the possible bathymetric grid size. The Isis ROV used ultra-short baseline (USBL) to obtain frequent absolute positions (each with rms error of 5 m) to correct for positional inaccuracies. Some raw data files did not import into the Caraibes software thus not all bathymetry data could be processed and included in the final grids. Gridded multibeam bathymetry data have horizontal square grid cell sizes of 0.25 ? 0.5 m. |
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| Lineage: | Multibeam bathymetric data was acquired by the Isis ROV on two dives during RRS James Clark Ross cruise JR157 in 2007. Dives 10 and 11 occurred on 29.01.07-31.01.07. Bathymetric data were processed for erroneous soundings and to correct vehicle motion in the Ifremer Caraibes software package, and then gridded in the open-source softwares GMT and MB-System. Processed, gridded data is available in NetCDF format. | |
| Temporal Coverage: | |
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| Start Date | 2007-01-29 |
| End Date | 2007-01-31 |
| Spatial Coverage: | |
| Latitude | |
| Southernmost | -68.72 |
| Northernmost | -68.68 |
| Longitude | |
| Westernmost | -69.72 |
| Easternmost | -69.62 |
| Altitude | |
| Min Altitude | N/A |
| Max Altitude | N/A |
| Depth | |
| Min Depth | 0 |
| Max Depth | 690 |
| Location: | |
| Location | Antarctica |
| Detailed Location | Marguerite Bay |
| Sensor(s): |
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| Source(s): |
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| Data Collection: | The data have been collected using the Kongsberg Simrad MS-2000 echo-sounder mounted on Isis ROV |
| Distribution: | |
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| Distribution Media | Online Internet (HTTP) |
| Distribution Size | 45MB |
| Distribution Format | netCDF |
| Fees | N/A |
| Data Storage: | This dataset is composed of: - 10 NetCDF grids ~45MB - 1 readme file ~9kB |