A bathymetric compilation of Ascension Island, 2000-2017

• Main Authors: Fremand, Alice, Barnes, David
• Format: Dataset
• Language: English
• Published: UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation 2019
• Subjects: "EARTH SCIENCE","OCEANS","BATHYMETRY/SEAFLOOR TOPOGRAPHY","BATHYMETRY"; "EARTH SCIENCE","OCEANS","BATHYMETRY/SEAFLOOR TOPOGRAPHY","SEAFLOOR TOPOGRAPHY"; "EARTH SCIENCE","OCEANS","BATHYMETRY/SEAFLOOR TOPOGRAPHY","WATER DEPTH"; "EARTH SCIENCE","OCEANS","BATHYMETRY/SEAFLOOR TOPOGRAPHY"; Ascension Island; Bathymetry; Multibeam; Antarctic; Antarc*; British Antarctic Survey
• Online Access: https://dx.doi.org/10.5285/afba710f-dab1-4a63-867b-520177388224; https://data.bas.ac.uk/full-record.php?id=GB/NERC/BAS/PDC/01236

We present a new bathymetric compilation around Ascension Island here defined by the following bounding box: 14.57 to 14.17 W, 8.12 to 7.75 S. This bathymetry grid was compiled from a variety of multibeam swath bathymetry data acquired during 4 different cruises (see lineage). The data is available as a grid of approximately 50 m resolution in two different formats: a GMT-compatible (2-D) NetCDF and Arc/Info and ArcView ASCII grid format using geographic coordinates on the WGS84 datum. : The multibeam swath bathymetry data were collected on scientific cruises undertaken by British Antarctic Survey (BAS) on RRS James Clark Ross: JR53-AMT11, JR287, JR15001 and JR16-NG. The grid was created using the mbgrid program from MB-system version 5.5.2336, using the parameters " -E0.0005/0.0005/degrees! -G4 -A2 -F1 -R-14.57/-14.17/-8.12/-7.75" for Arc/Info and ArcView ASCII grid and " -E0.0005/0.0005/degrees! -G3 -A2 -F1 -R-14.57/-14.17/-8.12/-7.75" for the netCDF file. This uses a Gaussian weighted mean filter and the bathymetry is gridded as topography (positive upwards) : Quality control was undertaken manually to remove any outliers in the source datasets. This involved cleaning much of the raw data using the "mbedit" command from MB-system.