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Hurricane formation linked to sea color: study

Without chlorophyll, sunlight penetrates deeper into the ocean, leaving the surface water cooler.
by Staff Writers
Washington (AFP) Aug 15, 2010
A change in the color of the ocean could dramatically impact the number and intensity of hurricanes, according to US researchers.

A team of researchers with National Oceanic and Atmospheric Administration (NOAA) ran computer simulations of such a change in the North Pacific, a region that accounts for more than half the world's hurricane-force winds.

The main factor is the green tint ocean water takes when there are large concentrations of chlorophyll, a pigment that helps tiny organisms known as phytoplankton convert sunlight into food for the rest of the marine ecosystem.

"We think of the oceans as blue, but the oceans aren't really blue, they're actually a sort of greenish color," said lead reseacher Anand Gnanadesikan in a statement released Friday.

"The fact that [the oceans] are not blue has a [direct] impact on the distribution of tropical cyclones," Gnanadesikan said.

Without chlorophyll, sunlight penetrates deeper into the ocean, leaving the surface water cooler.

Cold water in turn causes changes in air circulation patterns, forcing strong winds aloft, "which tend to prevent thunderstorms from developing the necessary superstructure that allows them to grow into hurricanes," the researchers said.

Phytoplankton populations around the world have been declining over the last century, the reseachers said, citing recently published research.

The study is to appear in an upcoming issue of the journal Geophysical Research Letters.




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Deadly Typhoon Dianmu cuts across Japan
Tokyo (AFP) Aug 12, 2010
Typhoon Dianmu cut across northern Japan into the Pacific Thursday after leaving five dead in its wake in South Korea, the Japan Meteorological Agency said. With winds of up to 72 kilometres (45 miles) an hour, it moved across the northern tip of Honshu island for some three hours until around 8:00 pm (1100 GMT), after travelling northeast over the Sea of Japan, the agency said. The stor ... read more

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