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| Azores Bank | |
|---|---|
| Name | Azores Bank |
| Location | North Atlantic Ocean |
| Country | Portugal |
| Region | Azores |
| Type | Submarine bank |
| Depth | variable |
Azores Bank is a large submarine elevation in the North Atlantic located southwest of the Azores archipelago and associated with the Azores Plateau and the complex tectonic setting of the Mid-Atlantic Ridge. It forms part of a chain of seamounts, banks, and shelves including features near Terceira, São Miguel Island, Furnas volcanic areas, and the broader Iberian Basin-Atlantic margin. The feature plays a central role in regional navigation, fisheries, and scientific studies conducted by institutions such as the Portuguese Institute for the Sea and Atmosphere, the University of the Azores, and the National Oceanography Centre.
The Azores Bank lies within the Azores Triple Junction region where the North American Plate, Eurasian Plate, and African Plate interact, influencing the bank's morphology alongside hotspots attributed to the Azores hotspot. Bathymetric mapping links the bank to neighboring structures including the Gorringe Bank, Great Meteor Seamount, and the Terceira Rift. Substrate consists of basaltic volcanic rocks overlain by carbonate sediments deposited during Pleistocene and Holocene intervals associated with sea-level change recorded in cores studied by teams from the Woods Hole Oceanographic Institution, GEOMAR Helmholtz Centre, and the Instituto Português do Mar e da Atmosfera. Volcaniclastic deposits tie to eruptions historically associated with islands such as Pico Island and Faial Island, and mass-wasting features connect to submarine landslides observed near the Capelinhos volcanic deposits.
The Azores Bank influences regional circulation by interacting with the Azores Current, the North Atlantic Subtropical Gyre, and the Gulf Stream-derived frontal systems. Water masses present include North Atlantic Central Water, Mediterranean Water signatures at depth, and seasonal mixing linked to Azores High variability. Upwelling and retention zones produce frontogenesis comparable to that of the Irminger Sea and the Porcupine Bank, promoting nutrient fluxes documented by cruises from the NOAA and the European Marine Observation and Data Network. Hydrographic structure shows thermocline shoaling and mesoscale eddies akin to features observed around the Sargasso Sea, while internal tides and bottom-boundary layer dynamics resemble processes described at Blake Plateau and Northeast Newfoundland Slope.
Biological communities on the bank include benthic assemblages of sponges, gorgonians, and cold-water corals such as species analogous to those in the Darwin Mounds and the Logatchev hydrothermal region. Demersal fish assemblages show affinities with stocks near Madeira, Canary Islands, and continental shelves off Portugal and Spain, including commercially important taxa similar to Atlantic cod-related complexes, blackspot seabream-like groups, and pelagic visitors akin to bluefin tuna and Atlantic mackerel. Marine mammals including populations comparable to Sperm whale and Common dolphin are recorded in the greater Azores maritime zone, and seabird foraging overlap involves species analogous to Barolo shearwater and Cory's shearwater reported by ornithological surveys from the Royal Society for the Protection of Birds and the BirdLife International partners. Deep-sea chemosynthetic analogues, microbial mats, and meiofauna diversity have been sampled by expeditions involving the ROV ISIS, Jason systems, and submersibles previously deployed by the Alvin program.
The bank supports productive demersal and pelagic fisheries similar in socioeconomic function to the Grand Banks and the Georges Bank, providing resources for fleets from Portugal, Spain, and international distant-water fleets. Target species parallel those of the Azores Exclusive Economic Zone fisheries and contribute to landings reported in ports such as Ponta Delgada and Horta. Mineral resource interest parallels investigations at the Clarion-Clipperton Zone and includes potential phosphorite, manganese crusts, and polymetallic nodules analogous to deposits studied by the International Seabed Authority framework, though exploitation faces technological and regulatory constraints like those applied to the Mid-Atlantic Ridge mineral claims. Marine tourism, including recreational fishing, whale watching, and diving industries mirror services promoted by the Azores Tourism Observatory and regional development agencies.
Early cartographic mentions of submerged hazards and banks off the Azores appear in charts by Prince Henry the Navigator-era cartographers and later compilations by the Hydrographic Office and the British Admiralty. Scientific exploration advanced with 19th-century surveys by the Challenger expedition and 20th-century bathymetric work by the RV Meteor and RV Atlantis. Geophysical campaigns by the Scripps Institution of Oceanography, Lamont–Doherty Earth Observatory, and European research vessels refined bathymetry, while sonar mapping using multibeam echosounders and satellite altimetry from TOPEX/Poseidon and Jason-1 produced modern digital elevation models. Fishing records, logbooks from vessels associated with the Age of Sail and modern catch data archived by the Food and Agriculture Organization document evolving human interactions.
Management of the bank falls under frameworks similar to those used for high-seas and national maritime zones, involving agencies such as the European Union fisheries directives, the Convention for the Protection of the Marine Environment of the North-East Atlantic (OSPAR) analogues, and commitments to the Convention on Biological Diversity. Regional monitoring programs led by the Azores Regional Government, the European Space Agency remote-sensing projects, and collaborative research initiatives from universities including Imperial College London and University of Lisbon inform conservation measures like fishing effort controls, marine protected areas modeled after sites like Natura 2000 and the Papahānaumokuākea approach. International negotiation forums including United Nations bodies and scientific advisory panels guide precautionary strategies addressing climate change impacts comparable to observations in the North Atlantic Oscillation and acidification trends tracked by the Global Ocean Acidification Observing Network.
Category:Submarine banks of the Atlantic Ocean Category:Geography of the Azores