By Boris Dorschel, Andrew J. Wheeler, Xavier Monteys, Koen Verbruggen
Presented in an available, hassle-free structure, this atlas units out the entire significant gains published in the course of one of many biggest ever deep-sea mapping campaigns. a different perception into the morphology of the seabed alongside the continental margin of the North-East Atlantic, it finds for the 1st time many good points that experience hitherto been hidden underneath the waves. it really is organised either thematically and by way of area, with the ocean ground and its organic hotspots – parts of excessive biodiversity akin to seamounts – proven at a answer impossible prior to. The atlas offers every thing from submarine canyons to coral carbonate mounds, utilizing electronic terrain types generated from multibeam information and images taken from unmanned deep-water cars (ROVs).
The full-colour imagery contains electronic third-dimensional seabed maps in addition to the images, with concise textual content descriptions and subject containers used to spotlight and clarify the geological, organic and hydrographical positive factors, as well as their value and context within the deep-sea realm. along the wealth of historical past details and subject containers on specified highlights, broad online assets hyperlink the reader to complete information units and GIS destinations, whereas feedback for additional analyzing element to ongoing study highlights. it is a attention-grabbing source that might be of use to an individual eager about off-shore and underwater actions, no matter if medical or commercial.
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Extra info for Atlas of the Deep-Water Seabed: Ireland
It may come as a surprise that the Irish deep seabed hosts a plethora of coral reefs as we usually associate coral reefs with warm, tropical waters. In fact, the majority of coral species (65%) actually live in water depths deeper than 50 m. In Irish waters, cold-water corals have been reported from as far down as 2,000 m bsl. Like tropical corals, some species of these cold-water B. Dorschel et al. corals have the capacity to form reefs. In contrast to tropical reefs, however, Irish reefs are not found close to the shore but on the continental margin between 500 and 1,500 m bsl.
They are tens to hundreds of kilometres long, narrow valleys carved tens to several hundreds of metres deep into the continental margin. They often extend from the shelf break at 200 m water depth all the way down to the lower continental rise at approximately 2,500 m water depth funnelling large volumes of sediment and organic matter from shelf regions to the deep ocean (Fig. 1). Canyons were most active during glacial times when thick ice caps covered northern Europe. These ice caps flowed downhill under their own weight and fed into glaciers.
Canyons occur on both sides of the Rockall Trough and further south in the SW Approaches. Except for three small canyons at the east Rockall Bank, the Rockall Trough canyons are carved into the eastern continental margin. In the south, the canyons start more or less at the shelf break while the canyons along the Porcupine Bank and northernmost Irish continental margin barely cross the 1,000 m water depth contour. Channels can be found in the Porcupine Seabight and far to the west, south of Hatton Bank.