Gridded bathymetric compilation of selected areas within the Orkney Passage, Scotia Sea from multibeam echosounder data collected by multiple vessels (1989 - 2017)

We present two new gridded bathymetric compilations of the Orkney Passage, Scotia Sea here defined by the following bounding boxes: 39.1 to 39.6 W, 60.55 to 60.7 S and 41.7 to 42.6 W, 60.45 to 60.8 S.

These bathymetry grids were compiled from a variety of multibeam swath bathymetry data acquired during 12 different cruises (see lineage). The data is available as grids of 50 m resolution in a GMT-compatible (2-D) NetCDF format using geographic coordinates on the WGS84 datum.

This grid was compiled in support of the ongoing monitoring efforts in and around Orkney Passage as part of the Ocean Regulation of Climate by Heat and Carbon Sequestration and Transports (ORCHESTRA) programme and preceding BAS NC projects, and the Dynamics of the Orkney Passage Outflow (DynOPO) project.

Funding was provided by the NERC grants NE/K012843/1 and NE/N018095/1 as well as national capability

Date (Creation): 2020-04-02

Date (Revision): 2020-04-02

Date (Publication): 2020-04-02

Date (released): 2020-04-02

Edition: 1.0

Unique resource identifier: https://doi.org/10.5285/1221bbbd-843e-46d6-b96c-9c559aecfb20

Codespace: doi

Unique resource identifier: GB/NERC/BAS/PDC/01317

Codespace: https://data.bas.ac.uk/

Unique resource identifier: NE/K012843/1

Codespace: award

Unique resource identifier: NE/N018095/1

Codespace: award

Other citation details: Please cite this item as: Abrahamsen, E. (2020). Gridded bathymetric compilation of selected areas within the Orkney Passage, Scotia Sea from multibeam echosounder data collected by multiple vessels (1989 - 2017) (Version 1.0) [Data set]. UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation. https://doi.org/10.5285/1221bbbd-843e-46d6-b96c-9c559aecfb20

Credit: No credit.

Status: Completed

Point of contact

Organisation name	Individual name	Electronic mail address	Role
British Antarctic Survey, Natural Environment Research Council, UK Research & Innovation	Abrahamsen, E. Povl		Author
NERC EDS UK Polar Data Centre		PDCServiceDesk@bas.ac.uk	Point of contact

Maintenance and update frequency: As needed

Maintenance note: Completed

Global Change Master Directory (GCMD) Science Keywords

Theme

Bathymetry
Multibeam
Orkney Passage
Scotia Sea

Place

Scotia Sea Antarctica
Orkney Passage Antarctica

GEMET - INSPIRE themes, version 1.0

Oceanographic geographical features

Access constraints: Other restrictions

Other constraints: no limitations to public access

Access constraints: Other restrictions

Other constraints: no limitations

Use constraints: License

Other constraints: Open Government Licence v3.0

Use constraints: Other restrictions

Other constraints: This data is governed by the NERC Data Policy: https://www.ukri.org/who-we-are/nerc/our-policies-and-standards/nerc-data-policy/

Use constraints: Other restrictions

Other constraints: Further by downloading this data the user acknowledges that they agree with the NERC data policy (), and the following conditions:

1. To cite the data

Abrahamsen, E. P. (2020). Gridded bathymetric compilation of selected areas within the Orkney Passage, Scotia Sea from multibeam echosounder data collected by multiple vessels (1989 - 2017) [Data set]. UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation. https://doi.org/10.5285/1221BBBD-843E-46D6-B96C-9C559AECFB20

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.

Unique resource identifier: doi

Codespace: doi

Association Type: Cross reference

Unique resource identifier: doi

Codespace: doi

Association Type: Cross reference

Unique resource identifier: url

Codespace: url

Association Type: Cross reference

Unique resource identifier: doi

Codespace: doi

Association Type: Cross reference

Unique resource identifier: doi

Codespace: doi

Association Type: Cross reference

Unique resource identifier: doi

Codespace: doi

Association Type: Cross reference

Unique resource identifier: url

Codespace: url

Association Type: Larger work citation

Unique resource identifier: url

Codespace: url

Association Type: Larger work citation

Unique resource identifier: url

Codespace: url

Association Type: dependency

Unique resource identifier: url

Codespace: url

Association Type: Cross reference

Spatial representation type: Text, table

Language: English

Character set: UTF8

Topic category

Elevation
Geoscientific information
Oceans

Begin date: 1987-01-01

End date: 2017-12-31

Supplemental Information: It is recommended that careful attention be paid to the contents of any data, and that the author be contacted with any questions regarding appropriate use. If you find any errors or omissions, please report them to polardatacentre@bas.ac.uk.

Title: European Petroleum Survey Group (EPSG) Geodetic Parameter Registry

Date (Publication): 2008-11-12

Cited responsible party

Organisation name	Individual name	Electronic mail address	Role
European Petroleum Survey Group		EPSGadministrator@iogp.org	Publisher

Unique resource identifier: urn:ogc:def:crs:EPSG::3031

Version: 6.18.3

Distributor

Distributor contact

Organisation name	Individual name	Electronic mail address	Role
NERC EDS UK Polar Data Centre		PDCServiceDesk@bas.ac.uk	Distributor

Distributor format

Name	Version
application/x-hdf
application/x-hdf

Units of distribution: bytes

Transfer size: 4194304

OnLine resource

Protocol	Linkage	Name
WWW:LINK-1.0-http--link	https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=1221bbbd-843e-46d6-b96c-9c559aecfb20	Get Data

Units of distribution: bytes

Transfer size: 4194304

OnLine resource

Protocol	Linkage	Name
WWW:LINK-1.0-http--link	https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=1221bbbd-843e-46d6-b96c-9c559aecfb20	Get Data

Hierarchy level: Dataset

Statement: Methodology:

The bathymetry map was compiled from a variety of different data sources. The primary data are multibeam swath bathymetry collected from scientific cruises undertaken by British Antarctic Survey (BAS), Alfred Wegener Institute (AWI), or acquired during ESPS RV Hesperides expeditions. The complete list of the cruises used for the compilation is the following:

-RV Polarstern: ANT-VIII/5, ANT-XXII/4, ANT-XXIII/7

-RRS James Clark Ross: JR149, JR239, JR252, JR257/272A, JR259, JR281, JR310, JR16005

-ESPS RV Hesperides: hes97

The first grid (m41_swath_50m_nc.grd) was created using the mbgrid program from MB-system version 5.5.2336 , using the parameters "-E50/50/meters -R-39.6/-39.1/-60.7/-60.55 -G3 -A2 -T25 -W4 -M -N -C5/1 -P1 -F1 -V". This uses a Gaussian weighted mean filter. Values are interpolated using a spline (tension 25) up to five grid cells from the nearest data point only if additional data are found in two opposite directions.

The second grid (m42-44_swath_50m_nc.grd) was created using the mbgrid program from MB-system version 5.5.2336, using the parameters "-E50/50/meters -R-42.6/-41.7/-60.8/-60.45 -G3 -A2 -T25 -W4 -M -N -C5/1 -P1 -F1 -V". Like the first grid, this uses a Gaussian weighted mean filter. Values are interpolated using a spline (tension 25) up to five grid cells from the nearest data point only if additional data are found in two opposite directions.

Data quality:

Quality control was undertaken manually to remove any outliers in the source datasets. This involved cleaning much of the raw data using the "mbedit" program from MB-system. For data processed in this way, edit files have been submitted to the Polar Data Centre. In source files that were ingested as text files, outliers were manually removed.

To verify the accuracy of the resulting dataset, bottom depths were compared against CTD casts on cruise JR16005, excluding casts that were performed when the ship was moving and those where the CTD did not get within altimeter range of the bottom. Bottom depths were calculated from the CTD altimeter when near the bottom, and these were compared against the gridded dataset. On 81 casts, the median difference between the CTD-derived depths and gridded depths was 4.1 m with a standard deviation of 18.9 m. This compares favourably with GEBCO_2014, which had a median offset of 4.6 m with a standard deviation of 73.4 m, and GEBCO_2019, which has a median offset of 0.5 m but a standard deviation of 89.4 m.

Metadata

File identifier: 1221bbbd-843e-46d6-b96c-9c559aecfb20 XML

Metadata language: English

Character set: UTF8

Hierarchy level: Dataset

Hierarchy level name: dataset

Date stamp: 2020-04-02

Metadata standard name: ISO 19115 Geographic Information - Metadata

Metadata standard version: ISO 19115:2003(E)

Metadata author

Organisation name	Individual name	Electronic mail address	Role
NERC EDS UK Polar Data Centre		polardatacentre@bas.ac.uk	Point of contact

Overviews

Spatial extent

Provided by

Access to the catalogue

Read here the full details and access to the data.

Simple

Distributor

Metadata

Overviews

Spatial extent

Keywords

Provided by

Share on social sites