Morphometric parameters of the Squid Mounds (SQM), Namibian coral mound province

DOI

Quantitative morphometric analyses were carried out for each mound following the workflows presented by Purkis et al. (2007) The coral mound base was defined following the methodological approach of Correa et al. (2012) using the dip angle map, generated from the digital elevation model (DEM), to extract closed polygons that follow the 3°-contour line. This 3°-cutoff has been qualitatively validated with a comparison between the DEM and the dip angle (Fig. 2). Small-scaled polygons within mound perimeters and resulting from bathymetric artifacts were filtered out. Manual editing was applied to split simple merged mound structures (e.g. twin-peak mounds) based on higher cut-off slope values (4-5°). Furthermore, polygons describing the mound footprint have been corrected to remove unrealistic shapes especially common for the CBM. The DEM was subsequently re-gridded to generate hypothetical bathymetric maps without mounds, for which the vertical relief beneath each removed mound was interpolated from the mound perimeters. The newly interpolated surfaces were then subtracted from the original DEMs to evaluate the volume and heights of the coral mounds. Only features with a footprint area greater than 900 squared meters (corresponding to a two-dimensional array of 3 × 3 DEM grid cells) and with a height of >2 m above the surrounding seafloor (4 × 0.5 m of vertical precision) were considered as coral mounds and quantitatively analyzed.

Identifier
DOI https://doi.org/10.1594/PANGAEA.944627
Related Identifier https://doi.org/10.3389/fmars.2022.877616
Related Identifier https://doi.org/10.1594/PANGAEA.945015
Related Identifier https://doi.org/10.1111/j.1365-3091.2011.01306.x
Related Identifier https://doi.org/10.1086/519774
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.944627
Provenance
Creator Tamborrino, Leonardo ORCID logo; Purkis, Sam; Hebbeln, Dierk ORCID logo
Publisher PANGAEA
Publication Year 2022
Funding Reference German Research Foundation https://doi.org/10.13039/501100001659 Crossref Funder ID 390741603 https://gepris.dfg.de/gepris/projekt/390741603 EXC 2077: The Ocean Floor – Earth's Uncharted Interface
Rights Creative Commons Attribution 4.0 International; https://creativecommons.org/licenses/by/4.0/
OpenAccess true
Representation
Resource Type Dataset
Format text/tab-separated-values
Size 26999 data points
Discipline Earth System Research
Spatial Coverage (12.613W, -20.598S, 12.722E, -20.368N)
Temporal Coverage Begin 2015-12-30T23:46:00Z
Temporal Coverage End 2016-01-11T05:45:00Z