Title

Glacial trough geomorphic feature layer

License

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Abstract

The glacial trough geomorphic feature layer represents the spatial extent of the glacial troughs of the worlds oceans based on interpretation of the SRTM30 plus v7 global bathymetry model. The layer is one of the 25 layers that make up the global seafloor geomorphic features map (Harris et.al. 2014). Shelf valleys at high latitudes incised by glacial erosion during the Pleistocene ice ages form elongate troughs, typically trending across the continental shelf and extending inland as fjord complexes (Hambrey, 1994). The largest of these features are glacial troughs, characterised by depths of over 100 m (often exceeding 1,000 m depth) and are distinguished from shelf valleys by an over-deepened longitudinal profile that reaches a maximum depth inboard of the shelf break, thus creating a perched basin on the shelf with an associated sill (Hambrey, 1994). Glacial troughs were digitized by hand based on 50 m contoured data for the Antarctic and 10 m contoured data for other shelf areas.

Publication Date

Feb. 5, 2014, midnight

Type

Vector Data

Keywords

Downloadable Data , features , Glacial_troughs , seafloor, geomorphic features, habitats

Category

Oceans

features and characteristics of salt water bodies (excluding inland waters). Examples: tides, tidal waves, coastal information, reefs

Regions

Global

Owner

jcleary

Group

Marine Geospatial Ecology Lab at Duke University

More info

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Restrictions

no limitations on public access

Purpose

The glacial trough geomorphic feature layer represents the spatial extent of the glacial troughs of the worlds oceans based on interpretation of the SRTM3...

Language

English

Supplemental Information

No information provided

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