• Arctic SDI catalogue
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Seafloor Geomorphology - Fans

We present the first digital seafloor geomorphic features map (GSFM) of the global ocean. The GSFM includes 131,192 separate polygons in 29 geomorphic feature categories, used here to assess differences between passive and active continental margins as well as between 8 major ocean regions (the Arctic, Indian, North Atlantic, North Pacific, South Atlantic, South Pacific and the Southern Oceans and the Mediterranean and Black Seas). The GSFM provides quantitative assessments of differences between passive and active margins: continental shelf width of passive margins (88 km) is nearly three times that of active margins (31 km); the average width of active slopes (36 km) is less than the average width of passive margin slopes (46 km); active margin slopes contain an area of 3.4 million km2 where the gradient exceeds 5°, compared with 1.3 million km2 on passive margin slopes; the continental rise covers 27 million km2 adjacent to passive margins and less than 2.3 million km2 adjacent to active margins.

Examples of specific applications of the GSFM are presented to show that: 1) larger rift valley segments are generally associated with slow-spreading rates and smaller rift valley segments are associated with fast spreading; 2) polar submarine canyons are twice the average size of non-polar canyons and abyssal polar regions exhibit lower seafloor roughness than non-polar regions, expressed as spatially extensive fan, rise and abyssal plain sediment deposits – all of which are attributed here to the effects of continental glaciations; and 3) recognition of seamounts as a separate category of feature from ridges results in a lower estimate of seamount number compared with estimates of previous workers.

Reference:

Harris PT, Macmillan-Lawler M, Rupp J, Baker EK Geomorphology of the oceans. Marine Geology.

Simple

Date ( Revision )
2016-01-28
Edition
http://localhost:8080/demodem/editioin
Status
Completed
Owner
  GRID Arendal - ( )
Maintenance and update frequency
As needed
Keywords ( Theme )
  • marine
  • abiotic
  • boundary
Keywords ( Place )
  • seafloor
Access constraints
Copyright
Use constraints
otherRestictions
Spatial representation type
Vector
Metadata language
en
Character set
UTF8
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Reference system identifier
WGS 1984
OnLine resource
Figure%201.23-1%20Seafloor%20Geomorphology.tif ( WWW:DOWNLOAD-1.0-http--download )

Image

OnLine resource
Fans.zip ( WWW:DOWNLOAD-1.0-http--download )

Shape

OnLine resource
fans ( OGC:WMS-1.3.0-http-get-map )

WMS Service

Hierarchy level
Dataset

Conformance result

Date ( Publication )
Pass
File identifier
94ec0c95-3ae8-47a3-8743-fb55a630dba4 XML
Metadata language
en
Character set
UTF8
Date stamp
2023-02-13T13:59:02
Metadata standard name
ISO 19115:2003/19139
Metadata standard version
1.0
Point of contact
  CAFF - ( )
 
 

Overviews

overview
Figure%201.23-1%20Seafloor%20Geomorphology.jpg

Spatial extent

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Keywords

abiotic boundary marine

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