Search Results for: Ocean

Tagging the great white shark…and a few of his friends

What will some 4,000 of the smartest dressed elephant seals, tuna fish, albatrosses, leatherback sea turtles, great white sharks, and other pelagic megafauna in the Pacific all be wearing in the coming seasons? How about the latest in microprocessor-based electronic tags, some no bigger than oversized cufflinks? It’s all in a continuing effort to understand the habits of marine animals in that part of the world: what exactly lives where and why, what their migration routes and diving behaviors m

Scientists zero in on Arctic, hemisphere-wide climate swings

In the late 1990s, as scientists were reaching consensus that the Arctic had gone through 30 years of significant climate change, they began reading the first published papers about the Arctic Oscillation, a phenomenon reported to have hemisphere-wide effects.

In short order the arctic-science and the global-change communities were galvanized, says Richard Moritz, polar oceanographer with the UW’s Applied Physics Laboratory and lead author of a review of recent Arctic climate change in

Antarctic seabirds and climate change

Recent changes in Antarctic seabird populations may be linked to environmental change according to scientists reporting in the journal Science this week. Researchers from the Cambridge-based British Antarctic Survey (BAS) reviewed the best available data from a range of long-term studies to test the view that warming of the Earth`s climate is affecting Antarctic marine life. Whilst they found that sea-ice has a profound influence on population levels of snow petrels, Adélie and emperor penguins, the

Atmospheric wave linked to sea ice flow near Greenland, study finds

A NASA researcher finds that the amount of sea ice that moves between Greenland and Spitsbergen, a group of islands north of Norway, is dependent upon a “wave” of atmospheric pressure at sea level. By being able to estimate how much sea ice is exported through this region, called Fram Strait, scientists may develop further insights into how the ice impacts global climate.

This export of sea ice helps control the thermohaline circulation, a deep water ocean conveyor belt that moves warm, sal

Why the hammerhead shark’s head is in the shape it’s in

A comprehensive examination of how the unique head and snout affects maneuverability and the role of its electrosensory function for seeking food along the ocean floor

Why the peculiar head shape of the hammerhead shark developed as it did has been the subject of much speculation. The dorso-ventrally compressed and laterally expanded pre-branchial head is an unmistakable diagnostic feature of the sphyrnid sharks. This unique head shape has been termed the cephalofoil in recognition of

Scientists confirm age of the oldest meteorite collision on Earth

A team of geologists has determined the age of the oldest known meteorite impact on Earth – a catastrophic event that generated massive shockwaves across the planet billions of years before a similar event helped wipe out the dinosaurs.

In a study published in the Aug. 23 issue of the journal Science, the research team reports that an ancient meteorite slammed into Earth 3.47 billion years ago.

Scientists have yet to locate any trace of the extraterrestrial object itself or the gi

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