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5 December 2013 11:26 am ,
Vol. 342 ,
Exotic, elusive, and dangerous, snakes have fascinated humankind for millennia. They can be hard to find, yet their...
Researchers have sequenced and analyzed the first two snake genomes, which represent two evolutionary extremes. The...
Snake venoms are remarkably complex mixtures that can stun or kill prey within minutes. But more and more researchers...
At age 30, Dutch biologist Freek Vonk has built up a respectable career as a snake scientist. But in his home country,...
Since arriving on the island of Guam in the 1940s, the brown tree snake ( Boiga irregularis ) has extirpated native...
An animal rights group known as the Nonhuman Rights Project filed lawsuits in three New York courts this week in an...
Researchers have been hot on the trail of the elusive Denisovans, a type of ancient human known only by their DNA and...
Thousands of scientists in the Russian Academy of Sciences (RAS) are about to lose their jobs as a result of the...
- 5 December 2013 11:26 am , Vol. 342 , #6163
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The Oceans Finally Show Their Stripes
28 April 2008 (All day)
Researchers have assembled the most detailed picture of ocean currents ever produced, and in so doing they have revealed a vast array of striated currents that roughly parallel the equator. This new level of resolution should improve understanding of a wide variety of ocean-related phenomena.
Scientists have had a relatively easy time deciphering the big movements in the oceans. Major currents such as the Gulf Stream are easy to detect, for example, and climate researchers for some time have been tracking the Global Conveyor Belt--a giant underwater river that carries cold Arctic waters from the North Atlantic to the middle of the Pacific. More subtle ocean dynamics, known as weak structures, have remained largely invisible. Now an international team has assembled a high-resolution picture of the oceans using satellite radar and 20 years' worth of data collected from thousands of sensors in an ocean-surface network called the Global Drifter Program.
One of the most dramatic features revealed by the new data is a network of banded currents moving west to east and vice versa across all of the oceans at the snail's pace of about 30 meters an hour. "They're almost everywhere," says physical oceanographer and co-author Peter Niiler of the Scripps Institution of Oceanography in San Diego, California. "We've discovered many more weak structures than we thought," Niiler says. As Niiler, lead author Nikolai Maximenko of the University of Hawaii, Honolulu, and colleagues reported 24 April in Geophysical Research Letters, the currents in the northeastern Pacific, which move back and forth from the U.S. West Coast to Hawaii, could be the source of an important current that loops up the California coast and back south.
"Who would have thought the bands would be so ubiquitous," says geophysical fluid dynamicist Geoff Vallis of Princeton University. And physical oceanographer Terrence Joyce of Woods Hole Oceanographic Institution in Massachusetts says the currents "may well represent something completely different" from the usual products of temperature and other ocean dynamics. "Their physical cause is obscure," he says.