Mountains in the Atlantic Ocean mapped by multinational team on Celtic Explorer
16 June 2015
A multinational team of European, Canadian, and American ocean exploration experts, led by Thomas Furey of the Marine Institute, has revealed previously uncharted features on the Atlantic seabed including mountains and ridges taller than Carrauntoohil, Ireland’s highest mountain.
The survey on board Ireland’s national research vessel, the RV Celtic Explorer, is one of the first projects to be launched by the Atlantic Ocean Research Alliance, formed following the signing of the Galway Statement on Atlantic Ocean Co-operation between Canada, the EU and the US in May 2013. Its goals are to join resources of its three signatories to better understand the North Atlantic Ocean and to promote the sustainable management of its resources.
The team from the Marine Institute and Geological Survey of Ireland (INFOMAR -national seabed mapping programme), the Fisheries and Marine Institute of Memorial University of Newfoundland, Canada, the US National Oceanic and Atmospheric Administration (NOAA), and the Portuguese Institute for Sea and Atmosphere (IPMA), used the latest multi-beam echo sounder technology on the Celtic Explorer to create high resolution images of dramatic seabed features.
They uncovered 235km2 of iceberg scarred seabed, ancient glacial moraine features, and buried sediment channels on the Newfoundland and Labrador shelf. They charted a 15km-long down-slope channel feature on the western Atlantic continental slope, most likely formed by meltwater run-off associated with ice cap grounding during the last glaciation, approximately 20,000 years ago.
They crossed the dramatic Charlie-Gibbs Fracture Zone on the Mid-Atlantic Ridge creating a 3D visualisation of a 3.7km-high underwater mountain. Continuing eastward a straight asymmetric ridge feature came to life standing proud from the flat seabed more than 140km long, peaking at 1,108m high – taller than Carrauntoohil.
The ambitious survey route included an area off Newfoundland and Labrador where cold water corals and sponges are known to occur and crossed the OSPAR designated Marine Protected Area in the dramatic topography of the central Atlantic. It also targeted the drop location for the first transatlantic telecommunications cable laid in 1858 between Ireland and Newfoundland, and set out to ground-truth seafloor features identified through satellite altimetry research in the last two years.
“This survey marks the beginning of an exciting Atlantic research mapping collaboration between the US, Canada and Europe,” said Dr Peter Heffernan, of the Marine Institute. “It shows what can be achieved when we pool our resources, sharing knowledge, infrastructure and technology. And we hope to build on this next year, when Ireland’s RV Celtic Explorer will be joined by research vessels from Norway and the USA, and in subsequent years”, he added.
“Seeing dramatic seabed features reveal themselves for the first time was a real highlight of the survey,” said Tommy Furey, chief scientist at the Marine Institute. “We need to better understand the features that make up the ocean seabed. With global population and seafood demand spiralling, we need to map our seabed to define favourable habitats for fishing, key sites for conservation, and safe navigation for shipping. Map it, manage it, and mind it.”
The survey was part-funded by the government of Newfoundland and Labrador which has invested about $5 million in RV Celtic Explorer expeditions since 2010 to support fisheries science activities. The vessel had just completed the annual fisheries survey in Newfoundland and Labrador, which provided the opportunity to embark on the transatlantic mapping survey on the return journey to Ireland.
Results from the Atlantic Transect will be presented at the Harnessing Our Ocean Wealth conference in Cork from July 10-11, and at the Seabed Mapping Working Group meeting preceding the event on July 9.http://www.engineersjournal.ie/2015/06/16/mountains-atlantic-ocean-mapped-celtic-explorer/http://www.engineersjournal.ie/wp-content/uploads/2015/06/Underwater_Mountain_3D1.jpghttp://www.engineersjournal.ie/wp-content/uploads/2015/06/Underwater_Mountain_3D1-300x300.jpgNewsmarine