Ocean

Tsunami formation: Study challenges long-held theory

A new NASA study is challenging a long-held theory that tsunamis form and acquire their energy mostly from vertical movement of the seafloor. An undisputed fact was that most tsunamis result from a massive shifting of the seafloor — usually from the subduction, or sliding, of one tectonic plate under another during an earthquake. Experiments conducted in wave tanks in ...

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Ocean warming to cancel increased carbon dioxide-driven productivity

University of Adelaide researchers have constructed a marine food web to show how climate change could affect our future fish supplies and marine biodiversity. Published today in Global Change Biology, the researchers found that high CO2 expected by the end of the century which causes ocean acidification will boost production at different levels of the food web, but ocean warming ...

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Overfishing in one of world’s most productive fishing regions, new study suggests

Overfishing in one of world’s most productive fishing regions, new study suggests

A new study suggests that more small-scale fishing boats are operating in the Gulf of California than is economically and ecologically sustainable, suggesting that local fishermen are spending more time and money to catch fewer fish. Scientists at Scripps Institution of Oceanography at the University of California San Diego used images from satellites and flyovers to count the number of ...

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Mysterious humming sound coming from the seaflor, northern Canada

The humming sound, apparently coming from the seafloor is alarming local hunters in Nunavut, northern Canada, as it seems to be scaring the marine mammals. The mysterious pinging sound, described also as a “hum” and a “beep” has been reported in Fury and Hecia Strait. The passage is known for the presence of various types of seals and bowhead whales, ...

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Recent advancements in mapping the world’s oceans

The scientists at Lamont-Doherty Earth Observatory, New York, have gathered data from hundreds of research cruises and made a significant contribution to providing easily accessible ocean floor maps to interested people across the globe. The mapping site is capable of finding a location of particular interest, zooming in and providing a user with a topographical map of the ocean floor ...

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New mathematical model maps undiscovered deep water coral reefs

Marine scientists have discovered four new deep-water coral reefs in the Atlantic Ocean, west of Ireland, by using a new mathematical modeling system which predicted their locations, the Plymouth University announced on October 12, 2015. The modeling system that predicted the occurrence of cold water corals using the power of predictive mathematical models has been developed at Plymouth University.  The discovered coral ...

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Scientists create the world’s first digital map of the seafloor’s geology

The composition of the seabed, which covers 70% of the Earth’s surface, has been mapped for the first time after 40 years. The research team from the University of Sydney’s School of Geosciences has created the world’s first digital map of the seabed’s geology. The most recent map, prior to the digital composition created by the University of Sydney’s scientists, ...

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Major coral bleaching phenomena now spreads globally, NOAA reports

A third global coral bleaching event was announced by the US National Oceanic & Atmospheric Administration (NOAA) on October 8, 2015. The event is expected to be enhanced by the strong El Nino, and will impact about 38% of the world’s coral reefs by the end of this year and kill more than 12 000 square kilometers of reefs (4 ...

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Aquarius satellite: One year observing the salty seas

Launched on June 10, 2011, aboard the Argentine spacecraft Aquarius/Satélite de Aplicaciones Científicas (SAC)-D, Aquarius is NASA’s first satellite instrument specifically built to study the salt content of ocean surface waters. Salinity variations, one of the main drivers of ocean circulation, are closely connected with the cycling of freshwater around the planet and provide scientists with valuable information on how ...

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New mountain found on the ocean floor off the coast of Iceland

Multi-beam measurements on a mission of research vessel Arni Fridriksson earlier this summer revealed vast underwater mountain deep roots from the continental shelf of 120 nautical miles west of the peninsula. The unnamed mountain on the ocean floor off the west coast of Iceland was found by Iceland’s Marine Research Institute (MRI Hafró). The mountain is in a plateau in the same ...

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