A commonly held belief that global warming will diminish oxygen concentrations in the ocean looks like it may not be entirely true. According to new research published in Science magazine, just the opposite is likely the case in the northern Pacific Ocean, with its anoxic zone expected to shrink in coming decades because of climate change.
An international team of scientists came to that surprising conclusion after completing a detailed assessment of changes since 1850 in the eastern tropical northern Pacific's oxygen minimum zone (OMZ). An ocean layer beginning typically a few hundred to a thousand meters below the surface, an OMZ is by definition the zone with the lowest oxygen saturation in the water column. OMZs are a consequence of microbial respiration and can be hostile environments for marine life.
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For thousands of years turtles have been used in Chinese traditional medicine to treat a wide variety of ailments and diseases. Originally published in the journal Radiata and recently republished HerpDigest David S. Lee and Liao Shi Kun write, "[In Chinese culture] turtles are symbolic of long life, personal wealth, fertility, strength, and happy households."
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In 2010, a powerful magnitude-8.8 earthquake struck off the coast of central Chile, rocking much of the country and producing tremor as far away as Argentina and Peru. But a new study suggests its effects were felt even farther away—in Antarctica. In the wake of the Maule temblor, the scientists found, several seismic stations on the frozen continent registered "ice quakes," probably due to fracturing of the ice as the planet's crust shook.
Earthquakes are already known to affect Antarctica’s ice shelves, thanks to the tsunamis they can spawn. Tsunami waves can propagate for great distances across the ocean; if the waves reach Antarctica’s ice shelves - the floating platforms of ice surrounding the continent—they can push and pull on the ice, promoting fractures and ultimately helping large chunks of ice break off, or calve.
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